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rev. 7.2 _20 seiko instruments inc. 1 s-8323/8327 series small package pwm control step-up switching regulator the s-8323/8327 series is a cmos pwm-control step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, a power mos fet (for s-8323 se ries) , and an error amplifier. equipped with best-designed control circuits, the products maintain high efficiency over a wide range of conditions with the capability of automatically controlling the duty ratio from 0% to 83% (78% for 250 khz model) according to each applied load. a step- up switching regulator is constructed by externally connecting only a coil, a capacitor and a diode to the s-8323 series. this feature, along with its small package and low current consumption, makes the s-8323 series ideal for the power supply of portable equipment. for applications requiring a high output current, products used with an external transistor (s-8327 series) are also available. ? features ? low voltage operation: 0.9 v(i out =1 ma, 50 khz and 100 khz models) ? low current consumption : during operation: 17.2 a (typ.) (v out = 3 v, 50 khz) during shutdown: 0.5 a (max.) ? duty ratio: built-in pwm control circuit ? external parts: coil, diode, and capacitor only (a transistor is needed for the s-8327 series.) ? output voltage: accuracy of 2.4% ? oscillation frequency: 30 khz, 50 khz, 100 khz, and 250 khz ? software start function is built-in ? shutdown function ? external transistor type is available (s-8327 series) ? sot-23-5 small plastic package ? sot-23-3 small plastic package ? sot-89-3 miniature power molded plastic package ? step-down and voltage-inverting type are available. ? applications ? power supplies for portable equipment such as pagers, handy calculators, and remote controllers ? constant voltage power supplies for camera s, video equipment, and communications equipment ? power supply for microcomputers ? block diagram (1) s-8323 series (types a, c, h) (2) s-8327 series (types b, h) (3) s-8323 series (types d, j) (4) s-8327 series (types e, j) vout vdd vss pwm control circuit - + vref soft start circuit ext vout vss pwm control circuit - + vref soft start circuit ext on/ off pwm control circuit - + vout cont vref soft start circuit vss on/ off vss vout cont pwm control circuit - + vref soft start circuit v dd figure 1 block diagram discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 2 seiko instruments inc. rev. 7.2 _20 ? selection guide 1. product name s-832 x x xx xx - xxx - t2 tape specification product name (abbreviation) package name (abbreviation) ma : sot-23-3 (without shutdown function) mc : sot-23-5 (with shutdown function, v dd /v out separate product) ua : sot-89-3 (without shutdown function) output voltage x 10 product category a : normal product, fosc=50 khz (s-8323 only) b : normal product, fosc=100 khz (s-8327 only) c : for pagers, fosc=30 khz (s-8323 only) d: v dd /v out separate product, fosc=50 khz (s-8323 only) e: v dd /v out separate product, fosc=100 khz (s-8327 only) h : normal product, fosc=250 khz (s-8323 / 7) j:v dd /v out separate product, fosc=250 khz (s-8323 / 7) power transistor 3: built-in switch. 7: external transistor 2. function list product name built in power transistor with external power transistor switching frequency (khz) shutdown function v dd /v out separate type package application s-8323axxmc yes ? 50 yes ? sot-23-5 with shutdown function s-8323axxma yes ? 50 ? ? sot-23-3 without shutdown function s-8323axxua yes ? 50 ? ? sot-89-3 without shutdown function s-8323dxxmc yes ? 50 ? yes sot-23-5 for variable output voltage by step-up dc/dc converter and step-down, inverted output dc/dc converter with an external resistor s-8323cxxma yes ? 30 ? ? sot-23-3 for pagers s-8323hxxmc yes ? 250 yes ? sot-23-5 with shutdown function s-8323jxxmc yes ? 250 ? yes sot-23-5 for variable output voltage by step-up dc/dc converter and step-down, inverted output dc/dc converter with an external resistor s-8327bxxmc ? yes 100 yes ? sot-23-5 for large load current with shutdown function s-8327bxxma ? yes 100 ? ? sot-23-3 for large load current without shutdown function s-8327bxxua ? yes 100 ? ? sot-89-3 for large load current without shutdown function s-8327exxmc ? yes 100 ? yes sot-23-5 for variable output voltage by step-up dc/dc converter with an external resistor s-8327hxxmc ? yes 250 yes ? sot-23-5 for large load current without shutdown function s-8327jxxxc ? yes 250 ? yes sot-23-5 for variable output voltage by step-up dc/dc converter with an external resistor discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 3 rev. 7.2 _20 3. product name list output voltage (v) s-8323axxmc series s-8323axxma series s-8323axxua series s-8323cxxma series s-8323dxxmc series 2.0 s-8323a20mc-ela-t2 ? ? ? s-8323d20mc-eza-t2 2.5 s-8323a25mc-elf-t2 s-8323a25ma-elf-t2 s-8323a25ua-elf-t2 s-8323c25ma-enf-t2 ? 2.7 s-8323a27mc-elh-t2 s-8323a27ma-elh-t2 s-8323a27ua-elh-t2 s-8323c27ma-enh-t2 ? 2.8 s-8323a28mc-eli-t2 ? ? ? ? 3.0 s-8323a30mc-elk-t2 s-8323a30ma- elk-t2 s-8323a30ua-elk-t2 s-8323c 30ma-enk-t2 s-8323d30mc-ezk-t2 3.3 s-8323a33mc-eln-t2 s-8323a33m a-eln-t2 s-8323a33ua-eln-t2 ? ? 3.8 s-8323a38mc-els-t2 ? ? ? ? 4.4 s-8323a44mc-ely-t2 ? ? ? ? 4.8 s-8323a48mc-emc-t2 ? ? ? ? 5.0 s-8323a50mc-eme-t2 s-8323a50m a-eme-t2 s-8323a50ua-eme-t2 ? s-8323d50mc-e3e-t2 5.2 s-8323a52mc-emg-t2 ? ? ? ? output voltage (v) s-8323hxxmc series s-8323jxxmc series 2.5 ? s-8323j25mc-fqf-t2 3.0 s-8323h30mc-f4k-t2 s-8323j30mc-fqk-t2 3.3 s-8323h33mc-f4n-t2 s-8323j33mc-fqn-t2 4.8 s-8323h48mc-f5c-t2 ? 5.0 s-8323h50mc-f5e-t2 s-8323j50mc-fre-t2 output voltage (v) s-8327bxxmc series s-8327bxxma series s-8327bxxua series s-8327exxmc series 2.0 ? ? ? s-8327e20mc-eva-t2 2.5 s-8327b25mc-erf-t2 s-8327b25m a-erf-t2 s-8327b25ua-erf-t2 ? 2.7 s-8327b27mc-erh-t2 s-8327b27ma- erh-t2 s-8327b27ua-erh-t2 ? 2.8 s-8327b28mc-eri-t2 ? ? ? 3.0 s-8327b30mc-erk-t2 s-8327b30m a-erk-t2 s-8327b30ua-erk-t2 ? 3.2 s-8327b32mc-erm-t2 ? ? ? 3.3 s-8327b33mc-ern-t2 s-8327b33ma- ern-t2 s-8327b33ua-ern-t2 ? 3.6 s-8327b36mc-erq-t2 ? ? ? 4.8 s-8327b48mc-esc-t2 ? ? ? 5.0 s-8327b50mc-ese-t2 s-8327b50ma-ese-t2 s-8327b50ua-ese-t2 s-8327e50mc-eke-t2 5.2 s-8327b52mc-esg-t2 ? ? ? 5.4 s-8327b54mc-esi-t2 ? ? ? 5.6 ? ? ? ? 6.0 s-8327b60mc-eso-t2 ? ? ? 7.0 ? ? ? s-8327e70mc-eky-t2 output voltage (v) s-8327hxxmc series s-8327jxxma series 2.5 ? s-8327j25mc-f8f-t2 3.0 s-8327h30mc-fwk-t2 s-8327j30mc-f8k-t2 3.3 s-8327h33mc-fwn-t2 s-8327j33mc-f8n-t2 3.6 S-8327H36MC-FWQ-T2 ? 5.0 s-8327h50mc-fxe-t2 s-8327j50mc-f9e-t2 5.2 s-8327h52mc-fxg-t2 ? 5.6 s-8327h56mc-fxk-t2 ? consult our sales person for products with an output voltage other than specified above. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 4 seiko instruments inc. rev. 7.2 _20 ? pin assignment figure 2 ? absolute maximum ratings caution the absolute maximum ratings are rated values exceeding which the product could suffer physical damage. these values must therefore not be exceeded under any conditions. pin no. pin name functions 1 on / off shutdown pin ?h?: normal operation (stepping up operation) ?l?: stop stepping up (whole circuit stop) 2 vout output voltage pin and power supply pin 3 n.c. (non connection) 4 vss gnd pin cont external inductor connection pin (for s-8323 series) 5 ext external transistor connection pin (for s-8327 series) pin no. pin name functions 1 vout output voltage pin 2 vdd power supply pin 3 n.c. (non connection) 4 vss gnd pin cont external inductor connection pin (for s-8323 series) 5 ext external transistor connection pin (for s-8327 series) pin no. pin name functions 1 vss gnd pin 2 vout output voltage pin and power supply pin cont external inductor connection pin (for s-8323 series) 3 ext external transistor connection pin (for s-8327 series) parameter symbol ratings unit vout, vdd pin voltage v out , v dd v ss 0.3 to v ss 11 v on/off pin voltage v on/off v ss 0.3 to v ss 11 v cont pin voltage v cont v ss 0.3 to v ss 11 v cont pin current i cont 300 ma ext pin voltage v ext v ss 0.3 to v out +0.3 v ext pin current i ext r 50 ma sot-89-3 500 power dissipation pd sot-23-5, sot-23-3 150 mw operating temperature t opr 40 to +85 q c storage temperature t stg 40 to +125 q c 2 3 1 sot-23-3 top view 5 4 3 2 1 sot-23-5 top view 3 2 1 sot-89-3 top view products: s-8323axxmc, s-8327bxxmc s-8323hxxmc, s-8327hxxmc package: sot-23-5 products: s-8323dxxmc, s-8327exxmc s-8323jxxmc, s-8327jxxmc packa g e: sot-23-5 products: s-8323axxma, s-8323axxua, s-8323cxxma s-8327bxxma, s-8327bxxua packages: sot-23-3, sot-89-3 ( unless otherwise s p ecified: ta=25 q c ) discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 5 rev. 7.2 _20 ? electrical characteristics 1-1. s-8323axxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit output voltage v out s-8323a52mc 5.075 5.200 5.325 s-8323a50mc 4.880 5.000 5.120 s-8323a33mc 3.221 3.300 3.379 s-8323a30mc 2.928 3.000 3.072 s-8323a27mc 2.635 2.700 2.765 s-8323a25mc 2.440 2.500 2.560 v 1 input voltage v in ? ? 9 operation start voltage v st1 i out =1 ma ? ? 0.9 oscillation start voltage v st2 no external parts, voltage applied to v out cont pulled up to 5 v by 10 k ? ? ? 0.8 2 operation holding voltage v hld i out =1 ma, measured by decreasing v in voltage gradually 0.7 ? ? 1 current consumption 1 i ss1 v out =output voltage 0.95 s-8323a52mc ? 31.6 52.6 a 2 s-8323a50mc ? 30.2 50.3 s-8323a33mc ? 19.1 31.8 s-8323a30mc ? 17.2 28.7 s-8323a27mc ? 15.5 25.9 s-8323a25mc ? 14.3 23.9 current consumption 2 i ss2 v out =output voltage+0.5 s-8323a52mc ? 3.5 6.9 s-8323a50mc ? 3.5 6.9 s-8323a33mc ? 3.3 6.5 s-8323a30mc ? 3.2 6.4 s-8323a27mc ? 3.2 6.4 s-8323a25mc ? 3.2 6.3 current consumption during shutdown i sss v on/off =0 v ? ? 0.5 switching current i sw v cont =0.4 v s-8323a52mc 114 182 ? ma ? s-8323a50mc 114 182 ? s-8323a33mc 78 125 ? s-8323a30mc 78 125 ? s-8323a27mc 61 98 ? s-8323a25mc 61 98 ? switching transistor leak current i swq v out = v cont =10 v ? ? 1.0 a ? line regulation ? v out1 v in =output voltage 0.4 to 0.6 ? 30 60 1 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 mv s-8323a52mc ? 0.26 ? mv/ c s-8323a50mc ? 0.25 ? output voltage temperature coefficient ? v out /? ta ta=-40 c to +85 c s-8323a33mc ? 0.17 ? s-8323a30mc ? 0.15 ? s-8323a27mc ? 0.14 ? s-8323a25mc ? 0.13 ? oscillation frequency f osc v out =output voltage 0.95 measured waveform at cont pin 42.5 50 57.5 khz 2 max. duty ratio maxduty v out =output voltage 0.95 measured waveform at cont pin 75 83 90 % v sh v out =output voltage 0.95 judged the oscillation at cont pin 0.75 ? ? v v sl1 when v out 1.5 v ? ? 0.3 shutdown pin input voltage (on/off type) v sl2 v out =output voltage 0.95 judged the stop of oscillation at cont pin when v out <1.5 v ? ? 0.2 soft start time t ss 3.0 6.0 12.0 ms ? efficiency effi s-8323a52mc ? 87 ? % 1 s-8323a50mc ? 87 ? s-8323a33mc ? 83 ? s-8323a30mc ? 83 ? s-8323a27mc ? 79 ? s-8323a25mc ? 79 ? external parts used: - coil: cd54 (100 h) of sumida corporation - diode: ma720 (schottky type) of matsus hita electronic industrial co., ltd. - capacitor: f93 (16 v, 22 f, tantalum type) of nichicon corporation applied v in =output voltage 0.6, applied, i out =output voltage/250 ? the shutdown pin is connected to vout pin. note 1: the output voltage specified above is the typical value. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 6 seiko instruments inc. rev. 7.2 _20 1-2. s-8323axxma, s-8323axxua, s-8323dxxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit output voltage v out s-8323x50xx 4.880 5.000 5.120 s-8323x33xx 3.221 3.300 3.379 s-8323x30xx 2.928 3.000 3.072 s-8323x27xx 2.635 2.700 2.765 s-8323x25xx 2.440 2.500 2.560 s-8323x20xx 1.952 2.000 2.048 v 1 input voltage v in ? ? 9 operation start voltage v st1 i out =1 ma ? ? 0.9 oscillation start voltage v st2 no external parts, voltage applied to v out cont pulled up to 5 v by 10 k ? ? ? 0.8 2 operation holding voltage v hld i out =1 ma, measured by decreasing v in voltage gradually 0.7 ? ? 1 current consumption 1 i ss1 v out =output voltage 0.95 s-8323x50xx ? 30.2 50.3 a 2 s-8323x33xx ? 19.1 31.8 s-8323x30xx ? 17.2 28.7 s-8323x27xx ? 15.5 25.9 s-8323x25xx ? 14.3 23.9 s-8323x20xx ? 11.6 19.4 current consumption 2 i ss2 v out =output voltage+0.5 s-8323x50xx ? 3.5 6.9 s-8323x33xx ? 3.3 6.5 s-8323x30xx ? 3.2 6.4 s-8323x27xx ? 3.2 6.4 s-8323x25xx ? 3.2 6.3 s-8323x20xx ? 3.1 6.2 switching current i sw v cont =0.4 v s-8323x50xx 114 182 ? ma ? s-8323x33xx 78 125 ? s-8323x30xx 78 125 ? s-8323x27xx 61 98 ? s-8323x25xx 61 98 ? s-8323x20xx 45 71 ? switching transistor leak current i swq v out = v cont =10 v ? ? 1.0 a line regulation ? v out1 v in = output voltage 0.4 to 0.6 ? 30 60 1 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 mv ? v out /? ta ta=-40c to +85 c s-8323x50xx ? 0.25 ? mv/ c s-8323x33xx ? 0.17 ? s-8323x30xx ? 0.15 ? output voltage temperature coefficient s-8323x27xx ? 0.14 ? s-8323x25xx ? 0.13 ? s-8323x20xx ? 0.10 ? oscillation frequency f osc v out =output voltage 0.95 measured waveform at cont pin 42.5 50 57.5 khz max.duty ratio maxduty v out =output voltage 0.95 measured waveform at cont pin 75 83 90 % 2 soft start time t ss 3.0 6.0 12.0 ms ? efficiency effi s-8323x50xx ? 87 ? % 2 s-8323x33xx ? 83 ? s-8323x30xx ? 83 ? s-8323x27xx ? 79 ? s-8323x25xx ? 79 ? s-8323x20xx ? 75 ? external parts used: - coil: cd54 (100 h) of sumida corporation - diode: ma720 (schottky type) of matsus hita electronic industrial co., ltd. - capacitor: f93 (16 v, 22 f, tantalum type) of nichicon corporation applied v in =output voltage 0.6, i out =output voltage/250 ? the vdd pin is connected to vout pin for v dd /v out separate product. note 1: the output voltage specified above is the typical value. note 2: v dd /v out separate products: boot operation is performed from v dd =0.8 v. however, 2.0 v or more for v dd is recommended to stabilize the output voltage and oscilation frequency. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 7 rev. 7.2 _20 1-3. s-8323cxxma (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit output voltage v out s-8323c30ma 2.928 3.000 3.072 s-8323c27ma 2.635 2.700 2.765 s-8323c25ma 2.440 2.500 2.560 v 1 input voltage v in ? ? 9 operation start voltage v st1 i out =1 ma ? ? 0.9 oscillation start voltage v st2 no external parts, voltage applied to v out cont pulled up to 5 v by 10 k ? ? ? 0.8 2 operation holding voltage v hld i out =1 ma, measured by decreasing v in voltage gradually 0.7 ? ? 1 current consumption 1 i ss1 v out =output voltage 0.95 s-8323c30ma ? 11.6 19.3 a 2 s-8323c27ma ? 10.5 17.5 s-8323c25ma ? 9.8 16.3 current consumption 2 i ss2 v out =output voltage+0.5 s-8323c30ma ? 3.0 5.9 s-8323c27ma ? 2.9 5.8 s-8323c25ma ? 2.9 5.8 switching current i sw v cont =0.4 v s-8323c30ma 78 125 ? ma ? s-8323c27ma 61 98 ? s-8323c25ma 61 98 ? switching transistor leak current i swq v out = v cont =10 v ? ? 1.0 a line regulation ? v out1 v in = output voltage 0.4 to 0.6 ? 30 60 mv 1 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 ? v out /? ta ta=-40 c to +85 c s-8323c30ma ? 0.15 ? mv/ c s-8323c27ma ? 0.14 ? output voltage temperature coefficient s-8323c25ma ? 0.13 ? oscillation frequency f osc v out =output voltage 0.95 measured waveform at cont pin 25 30 35 khz max. duty ratio maxduty v out =output voltage 0.95 measured waveform at cont pin 75 83 90 % 2 soft start time t ss 3.0 6.0 12.0 ms ? efficiency effi s-8323c30ma ? 81 ? % 2 s-8323c27ma ? 77 ? s-8323c25ma ? 77 ? external parts used: -coil: cd54 (100 h) of sumida corporation -diode: ma720 (schottky type) of matsus hita electronic industrial co., ltd. -capacitor: f93 (16 v, 22 f, tantalum type) of nichicon corporation applied v in =output voltage 0.6, i out =output voltage/250 ? note 1: the output voltage specified above is the typical value of the output voltage. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 8 seiko instruments inc. rev. 7.2 _20 1-4. s-8323hxxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit output voltage v out s-8323h31mc 3.026 3.100 3.174 s-8323h33mc 3.221 3.300 3.379 s-8323h50mc 4.880 5.000 5.120 v 1 input voltage v in ? ? 9 operation start voltage v st1 i out =1 ma ? ? 1.4 oscillation start voltage v st2 no external parts, voltage applied to v out cont pulled up to 5 v by 10 k ? ? ? 1.3 2 operation holding voltage v hld i out =1ma, measured by decreasing v in voltage gradually 0.7 ? ? 1 current consumption 1 i ss1 v out =output voltage 0.95 s-8323h31mc ? 82.0 136.6 a 2 s-8323h33mc ? 87.9 146.5 s-8323h50mc ? 142.6 237.7 current consumption 2 i ss2 v out =output voltage+0.5 s-8323h31mc ? 10.0 19.9 s-8323h33mc ? 10.0 19.9 s-8323h50mc ? 10.2 20.3 current consumption during shutdown i sss v on/off =0 v ? ? 0.5 switching current i sw v cont =0.4 v s-8323h31mc 78 125 ? ma ? s-8323h33mc 78 125 ? s-8323h50mc 114 182 ? switching transistor leak current i swq v out = v cont =10 v ? ? 1.0 a line regulation ? v out1 v in =output voltage 0.4 to 0.6 ? 30 60 mv 1 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 ? v out /? ta ta=-40c to +85 c s-8323h31mc ? 0.16 ? mv/ c s-8323h33mc ? 0.17 ? output voltage temperature coefficient s-8323h50mc ? 0.25 ? oscillation frequency f osc v out =output voltage 0.95 measured waveform at cont pin 212.5 250 287.5 khz 2 max. duty ratio maxduty v out =output voltage 0.95 measured waveform at cont pin 70 78 85 % v sh v out =output voltage 0.95 judged the oscillation at cont pin 0.75 ? ? v shutdown pin input voltage (on/off type) v sl1 when v out 1.5 v ? ? 0.3 v sl2 v out =output voltage 0.95 judged the stop of oscillation at cont pin when v out <1.5 v ? ? 0.2 soft start time t ss 1.8 3.6 7.2 ms ? efficiency effi s-8323h31mc ? 83 ? % 1 s-8323h33mc ? 83 ? s-8323h50mc ? 87 ? external parts used: - coil: cd54 (22 h) of sumida corporation - diode: ma720 (schottky type) of matsus hita electronic industrial co., ltd. - capacitor: f93 (16 v, 22 f, tantalum type) of nichicon corporation applied v in =output voltage 0.6, applied, i out =output voltage/250 ? the shutdown pin is connected to vout pin. note 1: the output voltage specified above is the typical value. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 9 rev. 7.2 _20 1-5. s-8323jxxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit s-8323j25mc 2.440 2.500 2.560 output voltage v out s-8323j50mc 4.880 5.000 5.120 input voltage v in ? ? 9 1 operation start voltage v st1 i out =1 ma ? ? 1.4 oscillation start voltage v st2 no external parts, voltage applied to v out cont pulled up to 5 v by 10 k ? ? ? 1.3 v 2 operation holding voltage v hld i out =1ma, measured by decreasing v in voltage gradually 0.7 ? ? 1 s-8323j25mc ? 64.8 108.0 current consumption 1 i ss1 v out =output voltage 0.95 s-8323j50mc ? 142.6 237.7 s-8323j25mc ? 9.9 19.7 a 2 current consumption 2 i ss2 v out =output voltage+0.5 s-8323j50mc ? 10.2 20.3 s-8323j25mc 61 98 ? switching current i sw vcont=0.4 v s-8323j50mc 114 182 ? ma switching transistor leak current i swq v out = vcont=10 v ? ? 1.0 a ? line regulation ? v out1 v in = output voltage 0.4 to 0.6 ? 30 60 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 mv s-8323j25mc ? 0.13 ? 1 output voltage temperature coefficient ? v out /? ta ta=-40 c to +85 c s-8323j50mc ? 0.25 ? mv/ c oscillation frequency f osc v out =output voltage 0.95 measured waveform at cont pin 212.5 250 287.5 khz max.duty ratio maxduty v out =output voltage 0.95 measured waveform at cont pin 70 78 85 % 2 soft start time t ss 1.8 3.6 7.2 ms ? s-8323j25mc ? 79 ? efficiency effi s-8323j50mc ? 87 ? % 2 external parts used: - coil: cd54 (22 h) of sumida corporation - diode: ma720 (schottky type) of matsus hita electronic industrial co., ltd. - capacitor: f93 (16 v, 22 f, tantalum type) of nichicon corporation applied v in =output voltage 0.6, i out =output voltage/250 ? the vdd pin is connected to vout pin for v dd /v out separate product. note 1: the output voltage specified above is the typical value. note 2: v dd /v out separate products: boot operation is performed from v dd =0.8 v. however, 2.0 v or more for v dd is recommended to stabilize the output voltage and oscilation frequency. however, accuuracy of output volutage is degraded to 4% under the v dd volltage between 2.0 v to 2.35 v. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 10 seiko instruments inc. rev. 7.2 _20 2-1. s-8327bxxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit s-8327b54mc 5.270 5.400 5.530 s-8327b50mc 4.880 5.000 5.120 s-8327b36mc 3.514 3.600 3.686 s-8327b33mc 3.221 3.300 3.379 output voltage v out s-8327b30mc 2.928 3.000 3.072 s-8327b28mc 2.733 2.800 2.867 3 s-8327b27mc 2.635 2.700 2.765 v s-8327b25mc 2.440 2.500 2.560 input voltage v in ? ? 9 operation start voltage v st1 i out =1 ma ? ? 0.9 oscillation start voltage v st2 no external parts, voltage applied to v out ? ? 0.8 4 operation holding voltage v hld i out =1ma, measured by decreasing v in voltage gradually 0.7 ? ? 3 s-8327b54mc ? 41.0 68.3 s-8327b50mc ? 37.6 62.6 s-8327b36mc ? 26.0 43.3 s-8327b33mc ? 23.7 39.5 current consumption 1 i ss1 v out =output voltage 0.95 s-8327b30mc ? 21.4 35.7 s-8327b28mc ? 20.0 33.3 s-8327b27mc ? 19.2 32.0 s-8327b25mc ? 17.8 29.7 s-8327b54mc ? 4.2 8.3 s-8327b50mc ? 4.2 8.3 a 4 s-8327b36mc ? 4.0 7.9 s-8327b33mc ? 4.0 7.9 current consumption 2 i ss2 v out =output voltage+0.5 s-8327b30mc ? 3.9 7.8 s-8327b28mc ? 3.9 7.8 s-8327b27mc ? 3.9 7.7 s-8327b25mc ? 3.9 7.7 current consumption while shutdown i sss v on/off =0 v ? ? 0.5 s-8327b54mc -5.3 -8.0 ? s-8327b50mc -5.3 -8.0 ? s-8327b36mc -3.5 -5.3 ? s-8327b33mc -3.5 -5.3 ? i exth vext=v out -0.4 v s-8327b30mc -3.5 -5.3 ? s-8327b28mc -2.7 -4.0 ? s-8327b27mc -2.7 -4.0 ? s-8327b25mc -2.7 -4.0 ? ext pin output current s-8327b54mc 10.7 16.0 ? ma ? s-8327b50mc 10.7 16.0 ? s-8327b36mc 7.0 10.5 ? s-8327b33mc 7.0 10.5 ? i extl vext=0.4 v s-8327b30mc 7.0 10.5 ? s-8327b28mc 5.3 8.0 ? s-8327b27mc 5.3 8.0 ? s-8327b25mc 5.3 8.0 ? line regulation ? v out1 v in =output voltage 0.4 to 0.6 ? 30 60 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 mv s-8327b54mc ? 0.27 ? s-8327b50mc ? 0.25 ? s-8327b36mc ? 0.18 ? s-8327b33mc ? 0.17 ? 3 ? v out /? ta ta=-40c to +85 c s-8327b30mc ? 0.15 ? mv/ c output voltage temperature coefficient s-8327b28mc ? 0.14 ? s-8327b27mc ? 0.14 ? s-8327b25mc ? 0.13 ? oscillation frequency f osc v out =output voltage 0.95 measured waveform at ext pin 85 100 115 khz max. duty ratio maxduty v out =output voltage 0.95 measured waveform at ext pin 75 83 90 % v sh v out =output voltage 0.95 judged the oscillation at ext pin 0.75 ? ? 4 v sl1 when v out 1.5 v ? ? 0.3 v shutdown pin input voltage v sl2 v out =output voltage 0.95 judged the stop of oscillation at ext pin when v out <1.5 v ? ? 0.2 soft start time t ss 3.0 6.0 12.0 ms ? s-8327b54mc ? 88 ? s-8327b50mc ? 88 ? s-8327b36mc ? 84 ? s-8327b33mc ? 84 ? efficiency effi s-8327b30mc ? 84 ? % 3 s-8327b28mc ? 80 ? s-8327b27mc ? 80 ? s-8327b25mc ? 80 ? external parts used: - coil: cd54 (47 h) of sumida corporation - diode: ma720 (schottky type) of matsus hita electronic industrial co., ltd. - capacitor: f93 (16 v, 47 f, tantalum type) of nichicon corporation - transistor: 2sd1628g of sanyo electric co., ltd. - base resistance (rb): 1.0 k ? - base capacitor (cb): 2200 pf (ceramic) applied v in =output voltage 0.6, i out =output voltage/50 ? the shutdown pin is connected to vout pin. note 1: the output voltage specified above is the typical value. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 11 rev. 7.2 _20 2-2. s-8327bxxma, s-8327bxxua, s-8327exxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit s-8327x50xx 4.880 5.000 5.120 s-8327x33xx 3.221 3.300 3.379 s-8327x30xx 2.928 3.000 3.072 output voltage v out s-8327x27xx 2.635 2.700 2.765 s-8327x25xx 2.440 2.500 2.560 3 s-8327x20xx 1.952 2.000 2.048 v input voltage v in ? ? 9 operation start voltage v st1 i out =1 ma ? ? 0.9 oscillation start voltage v st2 no external parts, voltage applied to v out ? ? 0.8 4 operation holding voltage v hld i out =1 ma, measured by decreasing v in voltage gradually 0.7 ? ? 3 s-8327x50xx ? 37.6 62.6 s-8327x33xx ? 23.7 39.5 s-8327x30xx ? 21.4 35.7 current consumption 1 i ss1 v out =output voltage 0.95 s-8327x27xx ? 19.2 32.0 s-8327x25xx ? 17.8 29.7 s-8327x20xx ? 14.5 24.1 s-8327x50xx ? 4.2 8.3 a 4 s-8327x33xx ? 4.0 7.9 s-8327x30xx ? 3.9 7.8 current consumption 2 i ss2 v out =output voltage+0.5 s-8327x27xx ? 3.9 7.7 s-8327x25xx ? 3.9 7.7 s-8327x20xx ? 3.8 7.6 s-8327x50xx -5.3 -8.0 ? s-8327x33xx -3.5 -5.3 ? s-8327x30xx -3.5 -5.3 ? i exth vext=v out -0.4 v s-8327x27xx -2.7 -4.0 ? s-8327x25xx -2.7 -4.0 ? ext pin output current s-8327x20xx -1.9 -2.9 ? s-8327x50xx 10.7 16.0 ? ma ? s-8327x33xx 7.0 10.5 ? s-8327x30xx 7.0 10.5 ? i extl vext=-0.4 v s-8327x27xx 5.3 8.0 ? s-8327x25xx 5.3 8.0 ? s-8327x20xx 3.8 5.7 ? line regulation ? v out1 v in =output voltage 0.4 to 0.6 ? 30 60 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 mv s-8327x50xx ? 0.25 ? s-8327x33xx ? 0.17 ? s-8327x30xx ? 0.15 ? 3 ? v out /? ta ta=-40 c to +85 c s-8327x27xx ? 0.14 ? mv/ c output voltage temperature coefficient s-8327x25xx ? 0.13 ? s-8327x20xx ? 0.10 ? oscillation frequency f osc v out =output voltage 0.95 measured waveform at ext pin 85 100 115 khz max. duty ratio maxduty v out =output voltage 0.95 measured waveform at ext pin 75 83 90 % 4 soft start time t ss 3.0 6.0 12.0 ms ? s-8327x50xx ? 88 ? s-8327x33xx ? 84 ? s-8327x30xx ? 84 ? efficiency effi s-8327x27xx ? 80 ? % 3 s-8327x25xx ? 80 ? s-8327x20xx ? 76 ? external parts used: - coil: cd54 (47 h) of sumida corporation - diode: ma720 (schottky type) of matsus hita electronic industrial co., ltd. - capacitor: f93 (16 v, 47 f, tantalum type) of nichicon corporation - transistor: 2sd1628g of sanyo electric co., ltd. - base resistor (rb): 1.0 k ? - base capacitor (cb): 2200 pf (ceramic) applied v in =output voltage 0.6, i out =output voltage/50 ? the vdd pin is connected to vout pin for v dd /v out separate product. note 1: the output voltage specified above is the typical value. note 2: v dd/ v out separate products: boot operation is performed from v dd =0.8 v. however, 2.0 v or more for v dd is recommended to stabilize the output voltage and oscilation frequency. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 12 seiko instruments inc. rev. 7.2 _20 2-3. s-8327hxxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit s-8327h30mc 2.928 3.000 3.072 s-8327h33mc 3.221 3.300 3.379 output voltage v out s-8327h50mc 4.880 5.000 5.120 s-8327h52mc 5.075 5.200 5.325 3 input voltage v in ? ? 9 v operation start voltage v st1 i out =1 ma ? ? 1.4 oscillation start voltage v st2 no external parts, voltage applied to v out ? ? 1.3 4 operation holding voltage v hld i out =1 ma, measured by decreasing v in voltage gradually 0.7 ? ? 3 s-8327h30mc ? 53.9 89.8 current consumption 1 i ss1 v out =output voltage 0.95 s-8327h33mc ? 59.4 99.0 s-8327h50mc ? 93.7 156.1 s-8327h52mc ? 98.0 163.3 s-8327h30mc ? 10.0 19.9 current consumption 2 i ss2 v out =output voltage+0.5 s-8327h33mc ? 10.0 19.9 a 4 s-8327h50mc ? 10.2 20.3 s-8327h52mc ? 10.2 20.3 current consumption while shutdown i sss v on/off =0 v ? ? 0.5 s-8327h30mc -3.5 -5.3 ? s-8327h33mc -3.5 -5.3 ? i exth vext=v out -0.4 v s-8327h50mc -5.3 -8.0 ? s-8327h52mc -5.3 -8.0 ? ext pin output current s-8327h30mc 7.0 10.5 ? ma ? s-8327h33mc 7.0 10.5 ? i extl vext=0.4 v s-8327h50mc 10.7 16.0 ? s-8327h52mc 10.7 16.0 ? line regulation ? v out1 v in =output voltage 0.4 to 0.6 ? 30 60 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 mv s-8327h30mc ? 0.15 ? s-8327h33mc ? 0.17 ? 3 ? v out /? ta ta=-40c to +85 c s-8327h50mc ? 0.25 ? mv/ c output voltage temperature coefficient s-8327h52mc ? 0.26 ? oscillation frequency f osc v out =output voltage 0.95 measured waveform at ext pin 212.5 250 287.5 khz max. duty ratio maxduty v out =output voltage 0.95 measured waveform at ext pin 70 78 85 % v sh v out =output voltage 0.95 judged the oscillation at ext pin 0.75 ? ? v sl1 when v out 1.5 v ? ? 0.3 v 4 shutdown pin input voltage (on/off type) v sl2 v out =output voltage 0.95 judged the stop of oscillation at ext pin when v out <1.5 v ? ? 0.2 soft start time t ss 1.5 3.0 6.0 ms ? s-8327h30mc ? 81 ? s-8327h33mc ? 81 ? efficiency effi s-8327h50mc ? 85 ? % 3 s-8327h52mc ? 85 ? external parts used: - coil: cd54 (22 h) of sumida corporation - diode: ma720 (schottky type) of matsus hita electronic industrial co., ltd. - capacitor: f93 (16 v, 47 f, tantalum type) of nichicon corporation - transistor: nds355an of national semiconductor applied v in =output voltage 0.6, i out =output voltage/50 ? the shutdown pin is connected to vout pin. note 1: the output voltage specified above is the typical value. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 13 rev. 7.2 _20 2-4. s-8327jxxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit s-8327j25mc 2.440 2.500 2.560 output voltage v out s-8327j50mc 4.880 5.000 5.120 input voltage v in ? ? 9 3 operation start voltage v st1 i out =1 ma ? ? 1.4 v oscillation start voltage v st2 no external parts, voltage applied to v out ? ? 1.3 4 operation holding voltage v hld i out =1 ma, measured by decreasing v in voltage gradually 0.7 ? ? 3 s-8327j25mc ? 44.9 74.8 current consumption 1 i ss1 v out =output voltage 0.95 s-8327j50mc ? 93.7 156.1 s-8327j25mc ? 9.9 19.7 a 4 current consumption 2 i ss2 v out =output voltage+0.5 s-8327j50mc ? 10.2 20.3 s-8327j25mc -2.7 -4.0 ? i exth vext=v out -0.4 v s-8327j50mc -5.3 -8.0 ? ext pin output current s-8327j25mc 5.3 8.0 ? ma ? i extl vext=-0.4 v s-8327j50mc 10.7 16.0 ? line regulation ? v out1 v in =output voltage 0.4 to 0.6 ? 30 60 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 mv s-8327j25mc ? 0.13 ? 3 output voltage temperature coefficient ? v out /? ta ta=-40 c to +85 c s-8327j50mc ? 0.25 ? mv/ c oscillation frequency f osc v out =output voltage 0.95 measured waveform at ext pin 212.5 250 287.5 khz max. duty ratio maxduty v out =output voltage 0.95 measured waveform at ext pin 70 78 85 % 4 soft start time t ss 1.5 3.0 6.0 ms ? s-8327j25mc ? 77 ? efficiency effi s-8327j50mc ? 85 ? % 3 external parts used: - coil: cd54 (22 h) of sumida corporation - diode: ma720 (schottky type) of matsus hita electronic industrial co., ltd. - capacitor: f93 (16 v, 47 f, tantalum type) of nichicon corporation - transistor: nds355an of national semiconductor applied v in =output voltage 0.6, i out =output voltage/50 ? the vdd pin is connected to vout pin for v dd /v out separate product. note 1: the output voltage specified above is the typical value. note 2: v dd/ v out separate products: boot operation is performed from v dd =0.8 v. however, 2.0 v or more for v dd is recommended to stabilize the output voltage and oscilation frequency. however,accuuracy of output volutage is degraded to 4% under the v dd volltage between 2.0 v to 2.35 v. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 14 seiko instruments inc. rev. 7.2 _20 ? test circuits ? operation 1. step-up dc/dc converter the s-8323/8327 series is a step-up switching regulator using a pulse width modulation met hod (pwm) and dc/dc converter and features a low current consumption. in conventional pfm dc/dc converters, pul ses are skipped at low output load current, causing fluctuation in ripple frequency of the output voltage, with the result of increase in ripple voltage. in s-8323/27 series the switching frequency does not change, alt hough the pulse width changes from 0% to 83%(78% for h, j types) corresponding to each load current. the ripple voltage generated from switching can be removed easily through the filter because the switching frequency is constan t. the built-in soft start circuit controls a rush current and ov ershoot of the output voltage when powering on or the on/off term inal turns to ?h? level. shutdown pin: stops or starts step-up operation. (only for sot-23-5 package products of a, b, and h series.) turning the shutdown pin low stops operation of all t he internal circuits and reduces current consumption significantly. do not use the shutdown pin in floating st ate because it has a structure shown in figure 4 and is not pulled up or pulled down internally. do not apply vo ltage of between 0.3 v and 0.75 v to the shutdown pin because applying such voltage increases the current consumpt ion. if the shutdown pin is not used, connect it to vout (vdd pin for d, e, j types) pin. the shutdown pin doesn?t have hysteresis. shutdown pin cr oscillation circuit output voltage ?h? operation fixed ?l? stop ? v in * figure 4 on/off vout ( vdd for d , e , j t yp es ) v ss * voltage obtained by extracting the voltage drop due to dc resistance of the inductor and the diode forward voltage from v in. figure 3 1. vss vout cont v - + - + (on/off ) 2. vss (on/off) vout cont 10k ? - + a 4. vss (on/off) vout - + a ext 3. vss vout v - + - + (on/off ) rb ext cb figure 3 oscilloscope oscilloscope (vdd) (vdd) (vdd) (vdd) discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 15 rev. 7.2 _20 + + - osc c out cont m1 v in l va di on/off vout figure 5 the following are basic equations [(1) through (7)] of the step-up switching regulator (see figure 5.) voltage at cont pin the moment m1 is turned on (current i l flowing through l is zero): the change in i l over time: di l v l v in- v s ? ? = ?? = ???? ............................................................(2) d l l integration of the above equation (i l ): v in - v s i l = ???? y t ................................................................ (3) l i l flows while m1 is on (t on ). the time of t on is determined by the oscillation frequency of the osc. the peak current (i pk ) after t on : v in - v s i pk = ???? y t on ......................................................... (4) l the energy stored in l is represented with 1/2 y l (i pk ) 2 . when m1 is turned off (t off ), the energy stored in l is transmitted through a di ode to the output capacitor. then reverse voltage (v l ) is generated. v l = (v out +v d ) - v in ......................................................................... (5) (v d : diode forward voltage) the voltage at cont pin rises only by the voltage corresponding to v out +v d . the change in the current flowing through the diode into v out during t off : di l v l v out +v d -v in ? ? = ?? = ??????? .............................................. (6) d l l integration of the above equation is as follows: v out +v d -v in i l =i pk - ?????? y t .................................................... (7) l v a =v s ............................................................................... (1) (v s : non-saturated voltage of m1) discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 16 seiko instruments inc. rev. 7.2 _20 during t on , the energy is stored in l and is not transmitted to v out . when receiving output current (i out ) from v out , the energy of the capacitor (c out ) is consumed. as a result, the pin voltage of c out is reduced, and goes to the lowest level after m1 is turned on (t on ). when m1 is turned off, the energy stored in l is transmitted through the diode to c out , and the voltage of c out rises drastically. v out is a time function that indicates the maximum value (ripple voltage: v p-p ) when the current flowing through the diode into v out and load current (i out ) match. next, the ripple voltage is found out as follows: i out vs t 1 (time) from when m1 is turned off (after t on ) to when v out reaches the maximum level: v out +v d -v in i out =i pk - ????????? y t 1 ............................................... (8) l l t 1 =(i pk -i out ) y ??????? ...................................... (9) v out +v d -v in when m1 is turned on (after t off ), i l =0 (when the energy of the inductor is comp letely transmitted). based on equation (7), l t off ?????? = ?? .....................................................(10) v out +v d -v in i pk when substituting equation (10) for equation (9), i out t 1 =t off - ??? y t off .................................................(11) i pk electric charge ?q 1 which is charged in c out during t1: v out +v d -v in ? q 1 = i l dt= i pk ? dt - ?????? ? tdt l v out +v d -v in 1 =i pk ? t 1 - ?????? ? ? t 1 2 ................................(12) l 2 t 1 0 t 1 0 t 1 0 when substituting equation (12) for equation (9): 1 i pk +i out ? q 1 =i pk - ? (i pk - i out ) y t 1 = ????? y t 1 ....................(13) 2 2 a rise in voltage (v p-p ) due to ? q 1 : ? q 1 1 i pk +i out v p-p = ??? = ??? y ????? y t 1 .......................(14) c out c out 2 when taking into consideration i out to be consumed during t1 and esr (equi valent series resistance) of c out , namely r esr : ? q 1 1 i pk +i out i pk +i out i out y t 1 v p-p = ??? = ?? y ???? y t 1 + ???? y r esr - ???? ...........................(15) c out c out 2 2 c out when substituting equation (11) for equation (15): (i pk -i out ) 2 t off i pk +i out v p-p = ???? y ?? + ????? y r esr ..................(16) 2i pk c out 2 therefore to reduce the ripple voltage, it is important that the capacitor connected to the out put pin has a large capacity and a small esr. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 17 rev. 7.2 _20 ? external parts selection for dc-dc converter the relationship between majorcharacteristics of the step-up circui t and characteristics parameters of the external parts are s hown in figure 6. for large output current? for high efficiency? for small ripple voltage operation efficiency stand-by efficiency figure 6 relationship between major character stics of the step-up circuit and external parts small inductance large inductance small dc resistance of inductor large output capacitance built-in switching transistor external switching transistor (small on resistance) small resistance of external resistor rb when an external switching transistor is used large resistance of external resistor rb when an external switching transistor is used . discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 18 seiko instruments inc. rev. 7.2 _20 1. inductor an inductance has strong influence on max. output current i out and efficiency . figure 7 shows i out characteristics for inductance of s-8323 and s-8327. figure 7 the peak current i pk increases by decreasing l and i out is at max. value at l value. further decreasing l decreases i out due to the lack of the current driving capacity of the switching transistor. the loss of i pk by the switching transistor decreases by increas ing l and the efficiency becomes max. at l value. further increasing l decreases efficiency due to the loss of dc resistance of the coil. 47 to 220 h inductor for s-8323 a/b/c/d/e, 22 to 100 h inductor for s-8327 a/b/c/d/e, 10 to 22 h inductor for s-8323 h/j, and 4.7 to 10 h inductor for s-8327 h/j are recommended. choose a value for l by referring to the reference data because the maximum output current is due to the input voltage in an ac tual case. choose an inductor so that the peak current i pk does not exceed the allowable current. exceeding the allowable current of the inductor causes magnetic saturation, remarkable low efficiency and destruction of the ic chip due to a large current. the peak current i pk in uncontinuous mode is calculated from the following formula: i pk = fosc: oscillation frequency vd ? 0.4 v for instance, when you choose 100 h at fosc=50 khz for l using the s-8323a50mc at the following conditions, i pk is calculated to 170 ma from the (17) formula. ? input voltage v in =3 v ? output voltage v out =5 v ? load current i out =30 ma the switching current limit circuit is not built into this ic chip. i pk current must be 500 ma or less. 2 i out (v out +v d -v in ) f osc ? l (a) (17) s-8323 a/b/c/d/e i out d75c i out 47 220 recommended range l ( h ) v out =5.0 v, v in =3.0 v recommended range s-8327 a/b/c/d/e i out cd105 i out 22 100 l ( h ) v out =5.0 v, v in =3.0 v discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 19 rev. 7.2 _20 2. diode use an external diode that meets the following requirements: ? low forward voltage: (v f <0.3 v) ? high switching speed: (50 ns max.) ? reverse voltage: v out +v f or more ? rated current: i pk or more 3. capacitors (c in , c out ) a capacitor at the input side (c in ) improves the efficiency by reducing the power impedance and stabilizing the input current. select a c in value according to the impedance of the power s upply used. the capacitor value should be around 10 f. a capacitor at the output side (c out ) is used for smoothing the ripple voltage. therefore select a capacitor with a small esr (equivalent series resistance) and a large c apacitance. the capacitor value should be 10 f min. a tantalum electrolytic capacitor and an organic semiconductor capac itor are especially recommended because of their superior low-temperature characteristic and leakage current characteristic. 4. external transistor (s-8327 series) for the s-8327 series, connecting an external transistor increases the output curren t. a bipolar (npn) transistor or an enhancement (n-channel) mos fet transistor can be used as external transistor. 4.1. bipolar (npn) transistor a circuit example using a bipolar transistor (npn), sanyo 2sd1628g (h fe =280 to 560) is shown in figure 11. the h fe value and the rb value determine the driving capacity to increase the out put current using a bipolar tr ansistor. a peripheral circui t example of the transistor is shown in figure 8. figure 8 external transistor peripheral vout (vdd for d, e, j types) i pk ext 1 k nch pch cb rb s-8327 2200 pf 1 k ? is recommended for rb. rb is calculated from the following formula: v out -0.7 0.4 v dd -0.7 0.4 rb= ???? - ??? (rb= ???? - ??? for d, e, j types) ib |i exth | ib |i exth | ib : i pk /h fe a small rb increases output current, however, the efficiency decreases. the current flows pulsating and there is voltage drop due to wiring resistance in an actual circuit, therefore optimum rb value should be determined by experiment. a speed-up capacitor connected in parallel with rb resistanc e as shown in figure 9 decreases the switching loss and improves the efficiency. cb is calculated from the following formula: 1 cb ????????? 2 rb f osc 0.7 however, in practice, the optimum cb value also varies with the characteristics of the bipolar transistor to be employed. therefore, determine the optimum value through experiments. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 20 seiko instruments inc. rev. 7.2 _20 4.2. enhancement mos fet type 5. others (s-8323d/j and s-8327e/j only) the s-8323d/j and s-8327e/j are applicable to the following uses because the power pin for ic chip and vout pin for output voltage are separated: c when changing the output voltage with an external resistance. d when outputting the high voltage such as +12 v or +15 v. e when making the step-down dc/dc converter f when making the voltage inverting type dc/dc converter. choose the products in the following table according to applications for c to e . use step-up step-down output voltage v cc 2 v v cc <3 v 3 v v cc <5 v 5 v v cc <9 v 9 v v cc ref. circuit 2 v v cc <3 v 3 v v cc <5 v 5 v v cc <9 v ref. circuit s-8323d20 { ? ? ? std. circuit (5) { ? ? appl. circuit 3 s-8323d30 ? { ? ? std. circuit (5) ? { ? appl. circuit 3 s-8323d50 ? ? { ? std. circuit (5) ? ? { appl. circuit 3 s-8323j25 ? { ? ? std. circuit (5) ? ? ? ? s-8323j50 ? ? { ? std. circuit (5) ? ? ? ? s-8327e20 { { { { std. circuit (6) ? ? ? ? s-8327e50 ? ? { { std. circuit (6) ? ? ? ? s-8327j25 ? { { { std. circuit (6) ? ? ? ? s-8327j50 ? ? { { std. circuit (6) ? ? ? ? connection to vdd pin v in or v cc v in or v cc v in or v cc v in ? v in v in v in ? the operational precautions are follows: i. this ic starts to oscillate and step up operation at v dd =0.8 v(1.3 v for j-type) but frequency of the oscillator does not stabilize. input the voltage from 2 v to 9 v for vdd pin to get the stabilized output voltage and oscillation frequency. the input voltage from 2 v to 9 v for vdd pin allows the connection of vdd pin to both input power pin v in and output power pin vout. ii. choose external resistors r a and r b not to affect to the output voltage with the consideration of the impedance between vout and vss pins in the ic chip. internal resistance between vout and vss pins are as follows: c s-8323d20, s-8323j20 and s-8327e20: 3.0 m ? to 19.6 m ? d s-8323j25, s-8327j25:3.9 m ? to 22.5 m ? e s-8323d30: 3.3 m ? to 22.6 m ? f s-8323d50,s-8323j50, s-8327e50 and s-8327j50: 2.1 m ? to 19.1 m ? figure 9 is a circuit example using nec corporation 2sk1959 mos fet transistor (n-channel). for a mos fet, an n-channel power mos fet should be used. because the gate voltage and current of the external power mos fet are supplied from the stepped up output voltage v out , the mos fet is driven more effectively. depending on which mos fet you use in your device, there is a chance of a current overrun at power on. thoroughly test all settings with your device before deciding on which one to use. also, try to use a mos fet with the gate capacitance of 300 pf or less. since the on resistor of the mos fet might affect the output amperage as well as the efficiency, the threshold voltage should be low. when the output voltage is as low as 2.0 v the same as in the s-8327e20, the circuit operates only when the mos fet has the threshold voltage lower than 2.0 v. figure 9 circuit example using 2sk1959 vout ext vout - + (on / off) (vdd) vss + - discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 21 rev. 7.2 _20 iii. attach the capacitor ?c c ? in parallel to r a resistance when the oscillation of the output voltage occurs. calculate ?c c ? from the following formula: iv. when the device is used with an external resistance in t he output voltages-variable mode, a large ripple voltage having a frequency lower than that of the switching frequency may appear as an output, if the load current is large, depending on the circuit patterns on the evaluation board and other factors (the interv al is several times or a few tens times as large as the switching interval (4 s), see waves in figure 10). be sure to check the circuit patterns on your board in advance for practical use. -30 -20 -10 0 10 20 -25 -20 -15 -10 -5 0 5 10 15 20 25 time ( sec ) cont pin voltage (v) -2 0 2 4 6 8 coil current (a) cont pin voltage (v) coil current (a) figure 10 c c (f)= 2 ? ? r a ? 20 khz 1 discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 22 seiko instruments inc. rev. 7.2 _20 ? standard circuits figure 11 pwm control circuit vref + - lcont sd vout v in vss on / off - + c out - + c in soft start circuit note: the power supply for ic chip is supplied from vout pin. figure 12 pwm control circuit vref + - sd vout vss - + c out 2200 pf 1 k : v in - + c in on / off ext soft start circuit note: the power supply for ic chip is supplied from vout pin. figure 13 pwm control circuit vref + - lcont sd vout v in vss - + c out - + c in soft start circuit note: the power supply for ic chip is supplied from vout pin. (1) s-8323axxmc ( 2 ) s-8327bxxmc, s-8327hxxmc (3) s-8323axxma, s-8323axxua, s-8323cxxma discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 23 rev. 7.2 _20 figure 14 pwm control circuit vref + - sd vout vss - + c out 2200 pf 1 k ? v in - + c in ext soft start circuit v out l note: the power supply for ic chip is supplied from vout pin. figure 15 v cc pwm control circuit vref + - lcont sd vdd v in - + c out - + c in soft start circuit c c vout vss r b r a r 1 r 2 note: the power supply for ic chip is supplied from vdd pin. figure 16 v cc pwm control circuit + - sd 2200 pf 1 k ? v in - + c in ext soft start circuit vdd - + c out c c vout vss r b r a l r 1 r 2 note: the power supply for ic chip is supplied from vdd pin. vref (4) s-8327bxxma, s-8327bxxua (5) s-8323dxxmc (output voltage adjustment circuit with external resistors), s-8323jxxmc (6) s-8327exxmc (output voltage adjustment circuit with external resistors) discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 24 seiko instruments inc. rev. 7.2 _20 (7) s-8327jxxmc r 1 r 2 pwm control circuit vref + - sd vout vss - + c out v in - + c in ext soft start circuit note: the power supply for ic chip is supplied from vdd pin. l vdd figure 17 (8) s-8327hxxmc vref + - vss - + c out v in - + c in ext note: the power supply for ic chip is supplied from vout pin. l vout on / off - soft start circuit pwm control circuit sd vref figure 18 ? precautions x mount external capacitors, a diode, and a coil as near as possible to the ic. x ripple voltage and spike noise occur in switching regulators. because they largely depend on the coil and the capacitor used, check them using an actually mounted model. x the performance of this ic varies depending on the pcb patterns, peripheral circuits or external parts. thoroughly test all s ettings with your device. also, try to use recommended external parts. if not, contact your local sii sales office. x seiko instruments shall not be responsible for any patent infringement by products including s-8323/8327 series in connection with the method of using s-8323/8327 series in such products, the spec ification of such products, or the country of destination the reof. x make sure dissipation of the switching transistor (especially at a high temperatures) does not exceed the allowable power diss ipation of the package. amb. temperature ta ( q c) figure 19 power dissipation of the package (before mounting) power dissipation p d (mw) 600 400 200 0 0 50 100 150 sot-23-5, sot-23-3 sot-89-3 x do not apply an electrostatic discharge to this ic that exceeds the performance rati ngs of the built-in electrostatic protecti on circuit. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 25 rev. 7.2 _20 application circuits 1. backup circuit reduces the backup battery voltage from 3 v to 1.5 v (from 2 cells to 1 cell). figure 20 cont on/off s-8323a vout vss - + - + s-ram 1.5 v main power (5 v) 2. 5 v/backup change for the products with shutdown function built-in, v out becomes about v in -0.6 v at shutdown. this characteristic allows the backup voltage of the microcomputer to be supp lied with low current consumption. figure 21 cont on/off s-8323a vout vss - + - + voltage detector ce cpu v in 3. step-down dc/dc converter figure 22 vdd s-8323d - + - + vout vss c out r e r b cont c in v in tr v cc r a r b c c the start circuit is not needed because the power supply is supplied from vdd pin to the ic. the maximum input voltage for vdd pin is 9 v. do not mount r a and r b resistors when v cc is 2 v for s-8323d20mc, 3 v for s-8323d30mc and 5 v for s-8323d50mc. the external resistor rb must be 60 ? or more and r e must be 6 k ? or less. a large value for r e raises efficiency due to the reduction of reactive current for r e and r b . too large value of r e lowers efficiency due to the large switching loss of the external transistor (tr). choose a suitable value of r e under the operating conditions. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 26 seiko instruments inc. rev. 7.2 _20 4. pda/digital camera power supply the following are a circuit example and its characteristics showi ng a 3-v system drive (3 v/200ma) powered by 4 secondary nicd batteries (3.6 to 4.8 v), 2 lithium-ion batteries (4.8 to 8.8 v) or 4 alkaline-manganese batteries (3.6 to 6.0 v). vdd s-8323d30 - + - + vout vss c out r e r b cont c in v in 3 v 2sa1213/toshiba corporation 5.1 k ? 750 ? a ma720 sd cd54/100 h f93 22 f l figure 23 (a) output current - output voltage (b) output current - efficiency 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1 10 100 1000 output current i out (ma) output voltage v out (v) v in =3.3 v v in =3.6 v v in =4.8 v v in =7.2 v 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 efficiency (%) v in =3.3 v v in =3.6 v v in =4.8 v v in =7.2 v output current i out (ma) figure 24 t (10 sec/div) output voltage (10 mv/div) 0 v point a voltage (1 v/div) 3 v v in =3.6 v, i out =300 ma (c) ripple characteristics figure 25 discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 27 rev. 7.2 _20 5. voltage inverting type dc/dc converter figure 26 vdd s-8323d - + + - v ss vout c out r e r b cont c in v in tr v cc r b r a the start circuit is not needed because the power is supplied from vdd pin to the ic. set v in to 9 v-|v cc | or less. when v cc is -2 v, - 3 v and - 5 v, use the s-8323d20mc, the s-8323d30mc and the s-8323d50mc respectively. always connect v out to gnd without attaching r a , r b . set r b to 60 ? or more and r e to 6 k ? or less. the larger r e , the smaller the reactive current through r e and r b , allowing the efficiency to be improved. on the other hand, the switching loss of the tr becomes large and consequently the efficiency will be worsened. select r e to ensure high efficienc y under operating conditions. 6. power supply for gaas and mr head the following are an application negative power supply circuit fo r gaas and mr head, and its characteristics when -3 v (-3 v 10%) and -5 v (-5 v 10%) are used for the applied power. set v in to 9 v-|v cc | or less. figure 27 vdd s-8323d30 - + + - vss vout c out r e r b cont c in v in -3 v 2sa1362/toshiba corporation 750 ? 2 k ? a cd54/100 h f93 47 f ma720 sd v cc (a) output current - output voltage (b) output current - efficiency output current i out (ma) output voltage v cc (v) efficiency (%) output current i out (ma) -3.05 -3.03 -3.01 -2.99 -2.97 -2.95 0.01 0.1 1. 10. 100. v in =2.7 v v in =3.0 v v in =4.5 v v in =5.0 v 0 20 40 60 80 100 0.01 0.1 1. 10. 100. v in =2.7 v v in =3.0 v v in =4.5 v v in =5.0 v figure 28 discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 28 seiko instruments inc. rev. 7.2 _20 t (10 sec/div) (10 mv/div) 0 v -3 v point a voltage (2 v/div) output voltage (c) ripple characteristics figure 29 when output current i out exceeds 50 ma, the current capacitance in the exte rnal transistor 2sa1362 bec omes in short supply and the ic may be broken. select a la rge current capacitance transistor. the start circuit is not needed because the power supply is supplied from vdd pi n to the ic. set vin to 9 v - |v cc | or less. the output voltage cannot be changed with external resistors. set r b to 60 ? or more and r e to 6 k ? or less. the larger r e , the smaller the reactive current through r e and r b , allowing the efficiency to be improved. on the other hand, the switching loss of the tr becomes large and consequently the efficiency will be worsened. select r e to ensure high efficienc y under operating conditions. 7. lcd power supply (standard circuit (6)) the following are an application power supply circuit (30 v/5 ma) for intermediate and large size lcd, and its characteristics when 3 v (3 v 10%) and 5 v (5 v 10%) are used for the applied power. s-8327e50 - + - + vout 4.7 f/50 v 2 ext c in v in to 30 v f93 c out cd54/100 h 1 k ? 0.022 f r b vss 2sd1624t ma720 sd l cb v dd r a 100 k ? c c 15 pf 482 k ? r b figure 30 discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 29 rev. 7.2 _20 27 28 29 30 31 32 33 0.01 0.1 1 10 100 v in =2.7 v v in =3.0 v v in =4.5 v v in =5.0 v 0 20 40 60 80 100 0.01 0.1 1 10 100 v in =2.7 v v in =3.0 v v in =4.5 v v in =5.0 v (a) output current - output voltage (b) output current - efficiency output current i out (ma) output voltage v out (v) efficiency (%) output current i out (ma) figure 31 8. flash memory power supply the following are a circuit example and its characteristics for a 5 v flash memory, 16 mbit (5 v/120 ma) on a single lithium ba ttery (2.4 v to 4.4 v). s-8327b50 - + - + vout 47 f ext c in v in 5 v f93 c out cd54/47 h 1 k ? 0.0022 f r b on/off control signal vss ma720 sd l 2sd1628g cb fi g ure 32 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1 10 100 1000 v in =2.0 v v in =2.4 v v in =3.6 v v in =4.4 v 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 v in =2.0 v v in =2.4 v v in =3.6 v v in =4.4 v (a) output current - output voltage (b) output current - efficiency output current i out (ma) output voltage v out (v) efficiency (%) output current i out (ma) figure 33 discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 30 seiko instruments inc. rev. 7.2 _20 9. power supply for ccd the follows are a circuit example and its characterist ics for ccd power supply (+15, -5.5 v/10 ma) powered by 4 alkaline-manganese batteries (3.6-6.0 v), used for digital still cameras and others. s-8327j50 vss - + - + - + v in co1 co2 /f93 10u 10u cee93 10 30 11 ma720 ma720 100u 100 uh vdd vout ext c in nds335n k k ra 270 rb 140 cc 30p /f93 v out + +15v v out - -5.5v tr1 figure 34 (a) output current - output voltage (positive output) (b) output current - output voltage (negative output) 14 14.4 14.8 15.2 15.6 16 0.1 1 10 100 v in =3.0 v v in =3.6 v v in =6.0 v output voltage v out (v) output current i out (ma) -6.5 -6.1 -5.7 -5.3 -4.9 -4.5 0.1 1 10 100 v in =3.0 v v in =3.6 v v in =6.0 v output voltage v out (v) output current i out (ma) (c) output current - efficiency 0 20 40 60 80 100 0.1 1 10 100 output current i out (ma) efficiency (%) v in =3.0 v vi n =3.6 v v in =6.0 v figure 35 discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 31 rev. 7.2 _20 ? temperature characteristics v st1 - ta v st2 - ta i ss1 - ta i ss2 - ta i sss - ta i sw - ta i swq - ta f osc - ta 20 80 60 40 0 -20 -40 100 0.0 v out =3.0 v, fosc=50 khz type 1.2 1.0 0.8 0.6 0.4 0.2 v st1 (v) ta ( c) s-8323 20 80 60 40 0 -20 -40 100 0.0 v out =3.0 v, fosc=5 0khz type 0.2 0.4 0.6 0.8 1.0 v st2 (v) ta ( c) s-8323 20 80 60 40 0 -20 -40 100 0 v out =3.0 v, fosc=50 khz type 10 20 30 40 50 ta ( c) i ss1 ( a) s-8323 20 80 60 40 0 -20 -40 100 0 v out =3.0 v, fosc=50 khz type 1 2 3 4 5 ta ( c) i ss2 ( a) s-8323 s-8323 20 80 60 40 0 -20 -40 100 0.0 v out =3.0 v, fosc=50 khz type 0.2 0.4 0.6 0.8 1.0 ta ( c) i sss ( a) s-8323 20 80 60 40 0 -20-40 100 0 v out =3.0 v, fosc=50 khz type 200 175 150 125 100 75 50 25 ta ( c) i sw (ma) 20 80 60 40 0 -20 -40 100 0.0 v out =3.0 v, fosc=50 khz type 0.2 0.4 0.6 0.8 1.0 i swq ( a) s-8323 ta ( c) 20 80 60 40 0 -20-40 100 30 v out =3.0 v, fosc=50 khz type 70 65 60 55 50 45 40 35 fosc (khz) s-8323 ta ( c) discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 32 seiko instruments inc. rev. 7.2 _20 v sh - ta v sl1 - ta v sl2 - ta t ss - ta i exth - ta i extl - ta maxduty - ta 20 80 60 40 0 -20 -40 100 50 s-8323 v out =3.0 v, fosc=50 khz type 60 70 80 90 100 maxduty (%) ta ( c) 20 80 60 40 0 -20 -40 100 0.0 s-8323 v out =3.0 v, fosc=50 khz type 0.2 0.4 0.6 0.8 1.0 v sh (v) ta ( c) 20 80 60 40 0 -20 -40 100 0.0 s-8323 v out =3.0 v, fosc=50 khz type 0.2 0.4 0.6 0.8 1.0 v sl1 (v) ta ( c) 20 80 60 40 0 -20 -40 100 0.0 s-8323 v out =3.0 v, fosc=50 khz type 0.2 0.4 0.6 0.8 1.0 ta ( c) v sl2 (v) 20 80 60 40 0 -20 -40 100 s-8323 v out =3.0 v, fosc=50 khz type 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0 ta ( c) t ss (ms) 20 80 60 40 0 -20 -40 100 -0 s-8327 v out =3.0 v, fosc=100 khz type -16 -14 -12 -10 -8 -6 -4 -2 i exth (ma) ta ( c) s-8327 v out =3.0 v, fosc=100 khz type 20 80 60 40 0 -20 -40 100 0 16 14 12 10 8 6 4 2 i extl (ma) ta ( c) discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 33 rev. 7.2 _20 v st1 - ta v st2 - ta s-8323 v out =3.3 v, fosc=250 khz type s-8323 v out =3.3 v, fosc=250 khz type 0.0 0.2 0.4 0.6 0.8 1.0 1.2 -40 -20 0 20 40 60 80 100 ta( c) v st (v) 0 0.2 0.4 0.6 0.8 1 -40 -20 0 20 40 60 80 100 ta( c) v st2 (v) i ss1 - ta i ss2 - ta s-8323 v out =3.3 v, fosc=250 khz type s-8323 v out =3.3 v, fosc=250 khz type 0 20 40 60 80 100 i ss1 ( a) -40 -20 0 20 40 60 80 100 ta ( c ) 0 2 4 6 8 10 12 i ss2 ( a) -40 -20 0 20 40 60 80 100 ta ( c ) f osc - ta maxduty - ta s-8323 v out =3.3 v, fosc=250 khz type s-8323 v out =3.3 v, fosc=250 khz type 220 230 240 250 260 270 280 -40 -20 0 20 40 60 80 100 ta( c) fosc (khz) 50 60 70 80 90 100 -40 -20 0 20 40 60 80 100 maxduty (%) ta( c) discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 34 seiko instruments inc. rev. 7.2 _20 ? voltage characteristics i ss1 , i ss2 - v dd i sw - v dd f osc - v dd i ss1 , i ss2 -v dd f osc - v dd s-8323j50 ta=25 c, v out =5.0 v, fosc=50 khz type s-8323j50 ta=25 c, v out =5.0 v, fosc=50 khz type 0 100 200 300 0246810 v dd (v) i ss1 i ss2 ( a) 100 200 300 012345 v dd (v) fosc (khz) 2 8 6 4 0 10 0 s-8323 ta=25c, v out =5.0 v, fosc=50 khz type 10 20 30 40 50 v dd (v) i ss1 i ss2 ( a) s-8323 1 4 3 2 0 5 0 ta=25c, v out =5.0 v, fosc=50 khz type 50 100 150 200 250 v dd (v) i sw (ma) 1 4 3 2 0 5 30 s-8323 ta=25c, v out =5.0 v, fosc=50 khz type 40 50 60 70 f osc (khz) v dd (v) discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 35 rev. 7.2 _20 ? ripple characteristics s-8323a30 1. light load (i out =200 a) v in =1.8 v t (10 sec/div) output voltage ( 10 mv/div ) 0 v 3 v cont voltage (1 v/div) 2. medium load (i out =10 ma) v in =1.8 v t (10 sec/div) output voltage ( 10 mv/div ) 0 v 3 v cont voltage (1 v/div) 3. heavy load (i out =60 ma) v in =1.8 v t (10 sec/div) output voltage ( 10 mv/div ) 0 v 3 v cont voltage (1 v/div) s-8327b30 1. light load (i out =200 a) v in =1.8 v t (5 sec/div) output voltage ( 10 mv/div ) 0 v 3 v cont voltage (1 v/div) 2. medium load (i out =10 ma) v in =1.8 v t (5 sec/div) output voltage ( 10 mv/div ) 0 v 3 v cont voltage (1 v/div) 3. heavy load (i out =200 ma) v in =1.8 v t (5 sec/div) output voltage ( 20 mv/div ) 0 v 3 v cont voltage (1 v/div) discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 36 seiko instruments inc. rev. 7.2 _20 ? transient responses 1. powering on due to v in (v in : 0 v 1.8 v) s-8323a30 (light load: i out =1 ma) t (1msec/div) 2 v input vol. (1 v/div) output v. (1 v/div) 0 v 3 v 0 v s-8323a30 (heavy load: i out =60 ma) t (1 msec/div) 2 v input vol. (1 v/div) output v. ( 1v/div) 0 v 3 v 0 v s-8327b30 (light load: i out =1 ma) t (1 msec/div) 2 v input vol. (1 v/div) output v. (1 v/div) 0 v 3 v 0 v s-8327b30 (heavy load: i out =200 ma) t (1 msec/div) 2 v input vol. (1 v/div) output v. (1 v/div) 0 v 3 v 0 v 2. powering on due to shutdown pin (von/off: 0 v 3.0 v) s-8323a30 (light load: i out =1 ma) t (1 msec/div) 3 v input vol. (1 v/div) output v. (1 v/div) 0 v 3 v 0 v v in =1.8 v s-8323a30 (heavy load: i out =60 ma) t (1 msec/div) 3 v input vol. (1 v/div) output v. (1 v/div) 0 v 3 v 0 v v in =1.8 v s-8327b30 (light load: i out =1 ma) t (1 msec/div) 3 v input vol. (1 v/div) output v. (1 v/div) 0 v 3 v 0 v v in =1.8 v s-8327b30 (heavy load: i out =200 ma) t (1 msec/div) 3 v input vol. (1 v/div) output v. (1 v/div) 0 v 3 v 0 v v in =1.8 v discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 37 rev. 7.2 _20 3. load fluctuations s-8323a30 (i out : 100 a 50 ma) v in =1.8 v t (100 sec/div) 3 v output vol. (50 mv/div) 100 a 50 ma load current s-8323a30 (i out : 50 ma 100 a) v in =1.8 v t (5 msec/dvi) 3 v output vol. (50 mv/div) 100 a 50 ma load current s-8327b30 (i out :100 a 100 ma) v in =1.8 v t (100 sec/div) 3 v output vol. (50 mv/div) 100 a 100 ma load current s-8327b30 (i out : 100 ma 100 a) v in =1.8 v t (5 msec/dvi) 3 v output vol. (50 mv/div) 100 a 100 ma load current there is no significant difference in load/powe r-voltage fluctuations between a, b, and h types. 4. power voltage fluctuations s8323a30 (v in :1.8 v 2.4 v) i out =50 ma t (100 sec/div) 3 v output vol. (25 mv/div) load current (0.2 v/div) 1.8 v 2.4 v s8323a30 (v in :2.4 v 1.8 v) i out =50 ma t (100 sec/div) 3 v output vol. (25 mv/div) load current (0.2 v/div) 1.8 v 2.4 v s8327b30 (v in :1.8 v 2.4 v) i out =100 ma t (100 sec/div) 3 v output vol. (25 mv/div) load current (0.2 v/div) 1.8 v 2.4 v s8327b30 (v in :2.4 v 1.8 v) i out =100 ma t (100 sec/div) 3 v output vol. (25 mv/div) load current (0.2 v/div) 1.8 v 2.4 v there is no significant difference in load/powe r-voltage fluctuations between a, b, and h types. discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 38 seiko instruments inc. rev. 7.2 _20 ? operation start voltage and operation holding voltage characteristics for output current (the characteristics measurement circui ts are standard circuit(1) for s-8323a/h, standard circuit(2) for s-8327b, standard circ uit(8) for s-8327h. the external parts ar e subject to the electrical properties of each a/b/h type.) s-8323a30 0.0 0.2 0.4 0.6 0.8 1.0 0246810 output current i out (ma) input voltage v in (v) v st1 v hld s-8323a50 0.0 0.2 0.4 0.6 0.8 1.0 0246810 output current i out (ma) input voltage v in (v) v st1 v hld s-8327b30 0.0 0.2 0.4 0.6 0.8 1.0 0246810 output current i out (ma) input voltage v in (v) v st1 v hld s-8327b50 0.0 0.2 0.4 0.6 0.8 1.0 0246810 output current i out (ma) input voltage v in (v) v st1 v hld 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 024681 0 s-8323h33 output current i out (ma) input voltage v in (v) v st1 v hld 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 024681 0 s-8323h50 output current i out (ma) input voltage v in (v) v st1 v hld 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0246810 s-8327h33 output current i out (ma) input voltage v in (v) v st1 v hld 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0246810 s-8327h50 output current i out (ma) input voltage v in (v) vst1 vhld discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 39 rev. 7.2 _20 ? input voltage characteristics for input current (the characteristics measurement circui ts are standard circuit(1) for s-8323a/h, standard circuit(2) for s-8327b, standard circ uit(8) for s-8327h. the external parts are compatible with the specified conditions of electr ical characteristics of types a, b and h, respectively. the input current adopted for the measur ing condition is the consumption current from v in under no load.) 0 100 200 300 400 012345 v out =2 v v out =3 v v out =5 v s-8323a input voltage v in (v) input current i in ( a) 0 10 20 30 40 50 012345 v out =3 v, rb=300 ? v out =3 v, rb=1 k ? v out =5 v, rb=300 ? v out =5 v, rb=1 k ? s-8327b input voltage v in (v) input current i in (ma) 0 100 200 300 400 500 600 700 12345 v out =2.5 v v out =3.3 v v out =5.0 v s-8323h input voltage v in (v) input current i in ( a) 0 1 2 3 4 5 6 7 8 12345 v out =3.3 v v out =5.0 v s-8327h input voltage v in (v) input current i in (ma) discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 40 seiko instruments inc. rev. 7.2 _20 ? reference data use reference data to c hoose the external parts. reference data give you the procedure to choose the recommended ex ternal parts for various applic ations and its characteristics data. 1. classification of products and inductors by usage the products are classified in general into built-in/external switching transistor(s-8323/7) types and low/high switching frequency(a,b/h) types. compared with built-in switching transistors, external switching transistors can yield larger out put current but their efficien cy decreases in a small output current range(especially less than 1 ma). compared with low frequency models, the high frequency models can yield smaller external parts, in particular inductors, and smaller output ripple voltage. however, they need more than two alkaline-manganese battery ce lls(operation voltage increases from 0.9 v to 1.4 v). and the efficiency decreases in a small out put current range(especially less than 1 ma). the figures below summarize above features. please re fer to those figures when choosing your models. 5 v 3 v 2 v s-8327b type s-8323a type (built-in switching transistor) lqh3c lqh4n cd54 cd105 cd54 (external switching transistor) 10 ma 100 1 a output voltage output current output current s-8323h type (built-in switching transistor) 2 v 3 v 5 v cdh113 d62f d62f s-8327h type (external switching transistor) 10 ma 100 ma 1 a output voltage cdrh4d18 figure 36 classification of inductors by output current discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 41 rev. 7.2 _20 2. procedure to choose the most suitable condition from reference data. please refer to the procedures shown below when c hoosing external parts based on the reference data. start choose the desired output voltage choose the condition for desired output current operation efficiency is more important rather than stand-by efficiency? *1 *2 *3 no yes choose the best condition for operation efficiency. stand-by efficiency is ok? *4 choose next best condition for operation efficiency choose the best condition for stand-by efficiency. o p eration efficienc y is ok? *4 *4 choose next best condition for operation efficiency no *4 *5 ripple voltage is ok? increase output current yes *5 no end yes *4 *4 *1) choose desired output voltage from conditions (1) to (29) shown in table 1 and 2. when desired output voltage does not exist in tables, choose the next higher voltage. for instance, when v out =3 v for s-8323a, choose from conditions (3) to (6). *2) choose all conditions from condi tions choosed above for output current needed for input voltage (min) of the operational condition from ?reference data 1 (a) out put voltage characteristics for output current?. for instance, when 10ma output current is needed at v in =0.9 v, choose from conditions (4) to (6). *3) stand-by efficiency means the efficiency when the output current is small (approx. 100 a ), operation efficiency means the efficiency when the output current is large (several ma). for instance, go to ?yes? when operation efficiency is more important rather than stand-by efficiency. *4) read the efficiency for input voltage and output current in operational condition from ?reference data 1 (b) efficiency characteristics for output current?. for instance, when v in =0.9 v at i out =10 ma, the efficiency is max. (75%) in condition (6) in (4) to (6). there is no difference between conditions (4 ) to (6) when the output current is 100 a at stand-by condition. therefore, choose condition (6). *5) read the ripple voltage under the operational condition selected above from ?reference data 2 ripple voltage characteristics for output current?. for instance, when condition (6) is selected above, the ripple voltage is 12 mv at v in =0.9 v and i out =10 ma. no yes discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 42 seiko instruments inc. rev. 7.2 _20 3. reference data for external components table 1 s-8323 series condition product type v out model name of l l value d c out (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) a a a a a a a a a h h h h h h h h 2 v 2 v 3 v 3 v 3 v 3 v 5 v 5 v 5 v 2.5 v 2.5 v 3.3 v 3.3 v 3.3 v 5 v 5 v 5 v lqh3c lqh4n lqh4n cd54 cd54 cd54 cd54 cd54 cd54 cdrh4d18 d62f cdrh4d18 d62f d62f cdrh4d18 d62f d62f 220 h 220 h 220 h 47 h 100 h 220 h 47 h 100 h 220 h 22 h 22 h 22 h 10 h 22 h 22 h 10 h 22 h ma720 22 f table 2 s-8327 series condition product type v out model name of l l value model name of external transistor rb cb d c out (18) (19) (20) (21) (22) (23) (24) (25) (26) (27) (28) (29) b b b b b b b b h h h h 3 v 3 v 3 v 3 v 5 v 5 v 5 v 5 v 3.3 v 3.3 v 5 v 5 v cd105 cd105 cd54 d75c cd105 cd105 cd54 d75c d62f cdh113 d62f cdh113 22 h 22 h 47 h 47 h 22 h 22 h 47 h 47 h 6.8 h 10 h 6.8 h 10 h 2sd1628g tn0200t nds335h tn0200t nds335n 300 ? 1 k ? 1 k ? 1 k ? 300 ? 1 k ? 1 k ? 1 k ? ? ? ? ? 0.01 f 0.0022 f 0.0022 f 0.0022 f 0.01 f 0.0022 f 0.0022 f 0.0022 f ? ? ? ? ma735 ma735 ma720 ma720 ma735 ma735 ma720 ma720 ma720 ma735 ma720 ma735 47 f 2 47 f 2 47 f 47 f 47 f 2 47 f 2 47 f 47 f 100 f the properties of external parts are shown below. table 3 part product name manufacturer?s name l value dc resistance max allowable current diameter height cd105 sumida corporation 22 f 0.10 ? 1.95 a 10.0 mm 5.4 mm cd54 47 f 0.37 ? 0.72 a 5.8 mm 4.5 mm 100 f 0.70 ? 0.52 a 220 f 1.57 ? 0.35 a cdrh4d18 22 h 0.397 ? 0.41 a 4.5 mm 2.0 mm cdh113 10 h 0.054 ? 2.00 a 11.0 mm 3.7 mm inductor lqh4n murata manufacturing co., ltd. 220 f 5.40 ? 0.11 a 4.5 mm 2.6 mm lqh3c 220 f 8.40 ? 0.07 a 3.2 mm 2.0 mm d75c toko, inc. 47 f 0.20 ? 0.76 a 7.6 mm 5.1 mm 100 h 0.40 ? 0.50 a d62f 6.8 h 0.075 ? 1.36 a 6.0 mm 2.7 mm 10 h 0.110 ? 1.20 a 22 h 0.247 ? 0.70 a ma720 matsushita electric industrial co., ltd. forward current 500 ma(at v f =0.55 v) diode (schottky) ma735 forward current 1 a(at v f =0.5 v) output capacitor f93 nichicon corporation su rface mount tantalum el ectrolytic capacitor 2sd1628g sanyo electric co., ltd. bipolar npn transistor tn0200t vashay intertechnology, inc. mos fet nch transistor external transistor nds335n national semiconductor corporation mos fet nch transistor discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 43 rev. 7.2 _20 4. reference data 1 output voltage characteristics for output current and (b) efficiency characteristics for output current under conditions (1) to (29) shown in tables 1 and 2 are shown below. (1)s-8323a20(lqh3c:220 h) 1.95 1.97 1.99 2.01 2.03 2.05 0.01 0.1 1. 10. 100. output current i out (ma) output voltage v out (v) vin =0 .9 v vin =1 .0 v vin =1 .2 v vin =1 .6 v (a) output current - output voltage 50 60 70 80 90 100 0.01 0.1 1. 10. 100. output current i out (ma) efficiency (%) vin =0 .9 v vin =1 .0 v vin =1 .2 v vin =1 .6 v (b) output current - efficiency (2)s-8323a20(lqh4n:220 h) output current i out (ma) output voltage v out (v) (a) output current - output voltage 1.95 1.97 1.99 2.01 2.03 2.05 0.01 0.1 1. 10. 100. vin=0.9v vin=1.0v vin=1.2v vin=1.6v 50 60 70 80 90 100 0.01 0.1 1. 10. 100. output current i out (ma) efficiency (%) vin=0.9v vin=1.0v vin=1.2v vin=1.6v (b) output current - efficiency discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 44 seiko instruments inc. rev. 7.2 _20 (3)s-8323a30(lqh4n:220 h) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) output voltage v out (v) (a) output current - output voltage 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. vin =0 .9 v vin =1 .2 v vin =1 .8 v vin =2 .4 v output current i out (ma) efficiency (%) (b) output current - efficiency (4)s-8323a30(cd54:47 h) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.0v vin=1.2v vin=1.6v output current i out (ma) output voltage v out (v) (a) output current - output voltage 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.0v vin=1.2v vin=1.6v output current i out (ma) efficiency (%) (b) output current - efficiency (5)s-8323a30(cd54:100 h) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) output voltage v out (v) (a) output current - output voltage 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) efficiency (%) (b) output current - efficiency (6)s-8323a30(cd54:220 h) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) output voltage v out (v) (a) output current - output voltage 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) efficiency (%) (b) output current - efficiency discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 45 rev. 7.2 _20 (7)s-8323a50(cd54:47 h) 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. output current i out (ma) efficiency (%) (b) output current - efficiency vin=0.9v vin=1.8v vin=3.0v vin=4.0v (8)s-8323a50(cd54:100 h) 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. output current i out (ma) efficiency (%) (b) output current - efficiency vin=0.9v vin=1.8v vin=3.0v vin=4.0v (9)s-8323a50(cd54:220 h) 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. output current i out (ma) efficiency (%) (b) output current - efficiency vin =0 .9 v vin =1 .8 v vin =3 .0 v vin =4 .0 v discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 46 seiko instruments inc. rev. 7.2 _20 (10)s-8323h25(cdrh4d18:22 h) 2.45 2.47 2.49 2.51 2.53 2.55 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.5v (11)s-8323h25(d62f:22 h) 2.45 2.47 2.49 2.51 2.53 2.55 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.5v (12)s-8323h33(cdrh4d18:22 h ) 3.25 3.27 3.29 3.31 3.33 3.35 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 (13)s-8323h33(d62f:10 h) 3.25 3.27 3.29 3.31 3.33 3.35 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 vin=1.5v vin=1.8v vin=3.0v output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.5v output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=1.5v vin=1.8v vin=3.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=1.5v vin=1.8v vin=3.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=1.5v vin=1.8v vin=3.0v output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.5v output current i out (ma) output voltage v out (v) (a) output current - output voltage discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 47 rev. 7.2 _20 (14)s-8323h33(d62f:22 h) 3.25 3.27 3.29 3.31 3.33 3.35 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 vin=1.5v vin=1.8v vin=3.0v output current i out (ma) efficiency (%) (b) output current - efficiency (15)s-8323h50(cdrh 4d18:22 h) 4.9 4.94 4.98 5.02 5.06 5.1 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 (16)s-8323h50(d62f:10 h) 4.9 4.94 4.98 5.02 5.06 5.1 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 (17)s-8323h50(d62f:22 h ) 4.9 4.94 4.98 5.02 5.06 5.1 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 vin=1.5v vin=1.8v vin=3.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=1.8v vin=3.0v vin=4.5v output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=1.8v vin=3.0v vin=4.5v output current i out (ma) output voltage v out (v) (a) output current - output voltage output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.8v vin=3.0v vin=4.5v vin=1.8v vin=3.0v vin=4.5v output cu r rent i out (ma) efficiency (%) (b) output current - efficiency vin=1.8v vin=3.0v vin=4.5v output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.8v vin=3.0v vin=4.5v output current i out (ma) output voltage v out (v) (a) output current - output voltage discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 48 seiko instruments inc. rev. 7.2 _20 (18)s-8327b30(cd105:22 h,rb=300 ? ,cb=0.01 f) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) efficiency (%) (b) output current - efficiency (19)s-8327b30(cd105:22 h,rb=1k ? ,cb=0.0022 f) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) efficiency (%) (b) output current - efficiency (20)s-8327b30(cd54:47 h,rb=1k ? ,cb=0.0022 f) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) efficiency (%) (b) output current - efficiency (21)s-8327b30(d75c:47 h,rb=1k ? ,cb=0.0022 f) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.2v vin=1.8v vin=2.4v vin=0.9v discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 49 rev. 7.2 _20 (22)s-8327b50(cd105:22 h,rb=300 ? ,cb=0.01 f) 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) efficiency (%) (b) output current - efficiency (23)s-8327b50(cd105:22 h,rb=1k ? ,cb=0.0022 f) 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) efficiency (%) (b) output current - efficiency (24)s-8327b50(cd54:47 h,rb=1k ? ,cb=0.0022 f) 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) efficiency (%) (b) output current - efficiency (25)s-8327b50(d75c:47 h,rb=1k ? ,cb=0.0022 f) 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) efficiency (%) (b) output current - efficiency discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 50 seiko instruments inc. rev. 7.2 _20 (26)s-8327h33(d62f:6.8 h) 3.25 3.27 3.29 3.31 3.33 3.35 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.5v vin=1.8v vin=3.0v (27)s-8327h33(cdh113:10 h ) 3.25 3.27 3.29 3.31 3.33 3.35 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 (28)s-8327h50(d62f:6.8 h ) 4.9 4.94 4.98 5.02 5.06 5.1 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 (29)s-8327h50(cdh113:10 h) 4.9 4.94 4.98 5.02 5.06 5.1 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) (b) output current - efficiency vin=4.5v vin=1.8v vin=3.0v vin=1.5v vin=1.8v vin=3.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=1.5v vin=1.8v vin=3.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=4.5v vin=1.8v vin=3.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=4.5v vin=1.8v vin=3.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.5v vin=1.8v vin=3.0v output current i out (ma) efficiency (%) (b) output current - efficiency vin=4.5v vin=1.8v vin=3.0v discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 51 rev. 7.2 _20 5. reference data 2 the ripple voltage characteristics data is shown below: (1)s-8323a20 (2)s-8323a20 (lqh3c:220 h,c out :22 f ) (lqh4n:220 h,c out :22 f ) similar to (2) 0 20 40 60 80 100 0.1 1. 10. 100. 1000. output current i out (ma) ripple voltage vr (mv) vin=0.9v vin=1.2v vin=1.6v (3)s-8323a30 (lqh4n:220 h,c out :22 f ) similar to (6) (4)s-8323a30 (7)s-8323a50 (cd54:47 h,c out :22 f ) (cd54:47 h,c out :22 f ) vin=0.9v vin=1.8v vin=2.4v 0 20 40 60 80 100 120 vin=0.9v vin=3.0v vin=4.0v 0.1 1. 10. 100. 1000. output current i out (ma) ripple voltage v r (mv) ripple voltage v r (mv) 0 20 40 60 80 100 0.1 1. 10. 100. 1000. output current i out (ma) (5)s-8323a30 (8)s-8323a50 (cd54:100 h,c out :22 f ) (cd54:100 h,c out :22 f ) 0 20 40 60 80 100 vin=0.9v vin=1.8v vin=2.4v vin=0.9v vin=3.0v vin=4.0v 0.1 1. 10. 100. 1000. output current i out (ma) ripple voltage v r (mv) ripple voltage v r (mv) 0.1 1. 10. 100. 1000. output current i out (ma) 0 20 40 60 80 100 discontinued product
small package pwm control step-up switching regulator s-8323/8327 series 52 seiko instruments inc. rev. 7.2 _20 (6)s-8323a30 (9)s-8323a50 (cd54:220 h,c out :22 f ) (cd54:220 h,c out :22 f ) 0 20 40 60 80 100 vin=0.9v vin=1.8v vin=2.4v vin=0.9v vin=3.0v vin=4.0v 0.1 1. 10. 100. 1000. output current i out (ma) ripple voltage vr (mv) ripple voltage vr (mv) 0.1 1. 10. 100. 1000. output current i out (ma) 0 20 40 60 80 100 (11)s-8323h25 (14)s-8323h33 (d62f:22 h,c out :22 f ) (d62f:22 h,c out :22 f ) 0 20 40 60 80 100 0.1 1 10 100 1000 v=1.2v v=1.5v output current i out (ma) ripple voltage vr (mv) 0 20 40 60 80 100 0.1 1 10 100 1000 v=3.0v v=1.8v v=1.5v output current i out (ma) ripple voltage vr (mv) (17)s-8323h50 (d62f:22 h,c out :22 f ) 0 20 40 60 80 100 0.1 1 10 100 1000 v=4.5v v=3.0v v=1.8v output current i out (ma) ripple voltage vr (mv) discontinued product
small package pwm control step-up switching regulator s-8323/8327 series seiko instruments inc. 53 rev. 7.2 _20 (18)(11)s-8327b30 (22)(23)s-8327b50 (cd105:22 h,c out :47 f 2 ) (cd105:22 h,c out :47 f 2 ) vin=0.9v vin=3.0v vin=4.0v 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) ripple voltage vr (mv) vin=0.9v vin=1.8v vin=2.4v 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) ripple voltage vr (mv) (20)s-8327b30 (24)s-8327b50 (cd54:47 h,c out :47 f) (cd54:47 h,c out :47 f ) vin=0.9v vin=3.0v vin=4.0v 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) ripple voltage vr (mv) vin=0.9v vin=1.8v vin=2.4v 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) ripple voltage vr (mv) (21)s-8327b30 (25)s-8327b50 (d75c:47 h,c out :47 f) (d75c:47 h,c out :47 f) similar to (20) similar to (24) (27)s-8327h33 (29)s-8327h50 (cdh113:10 h,c out :100 f) (cdh113:10 h,c out :100 f) v=3.0v v=1.8v v=1.5v output current i out (ma) ripple voltage vr (mv) 0 20 40 60 80 100 0.1 1 10 100 1000 v=4.5v v=3.0v v=1.8v output current i out (ma) ripple voltage vr (mv) 0 20 40 60 80 100 0.1 1 10 100 1000 discontinued product

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2.90.2 0.950.1 1.90.2 +0.1 -0.05 0.16 0.40.1 0.25 +0.2 -0.6 2.8 0~ 0.1 1 2 3 1.5 1.3max. 1.10.1 t2 1.60.1 0.250.05 4.00.1 2.00.1 4.00.1 1.5 +0.1 -0.05 1.10.1 2.850.2 feed direction 1.750.1 3.50.1 8.00.2 3.050.2 no.:mp003-a-c-sd-1.0 210.5 20.2 (60) (60) ?130.2 12.5max. 9.00.3 winding core ?60 +1 -0 ?180 +0 -3 n sot-23-3 mp003-a 990531 no.:mp003-a-p-sd-1.0 no.:mp003-a-r-sd-1.0 unit:mm l dimensions l taping specifications l reel specifications 1 reel holds 3000 ics. discontinued product

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the information described herein is subject to change without notice. seiko instruments inc. is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. the application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. when the products described herein are regulated products subject to the wassenaar arrangement or other agreements, they may not be exported without authorization from the appropriate governmental authority. use of the information described herein for other purposes and/or reproduction or copying without the express permission of seiko instruments inc. is strictly prohibited. the products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of seiko instruments inc. although seiko instruments inc. exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. the user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue. discontinued product

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