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data sheet white led step-up converter ap3019a mar. 2010 rev. 1.7 bcd semiconductor manufacturing limited 1 general description the ap3019a is an inductor-based dc/dc converter designed to drive up to eight white leds in series for backlight. only one feedback resistor is needed to control the led current and obtain required brightness. a constant frequency 1.2mhz pwm control scheme is employed in this ic, which means tiny external components can be used. specifically, 1mm tall inductor and 0.22 f output capacitor for a typical application is sufficient. additionally, the schottky diode in boost circuit is integrated on this chip. ap3019a also provides a disable pin to ease its use for different systems. the output over-voltage protection is implemented in ap3019a. when any led is broken or in other abnormal conditions, the output voltage will be clamped. the ap3019a is available in standard sot-23-6 and tsot-23-6 packages. features ? inherently uniform led current ? high efficiency up to 84% ? no need for external schottky diode ? output over-voltage protection (ovp) ? fixed 1.2mhz switching frequency ? uses tiny 1mm tall inductor ? requires only 0.22 f output capacitor applications ? cellular phones ? digital cameras ? lcd modules ? gps receivers ? pdas, handheld computers figure 1. package types of ap3019a sot-23-6 tsot-23-6
data sheet white led step-up converter ap3019a mar. 2010 rev. 1.7 bcd semiconductor manufacturing limited 2 sw gnd fb ctrl v out v in 1 2 34 5 pin 1 dot by marking 6 pin configuration k/kt package (sot-23-6/tsot-23-6) figure 2. pin configuration of ap3019a (top view) pin description pin number pin name function 1 sw switch pin. connect external inductor 2 gnd ground 3 fb voltage feedback pin. reference voltage is 200mv 4 ctrl shutdown and dimming pin. connect to 1.8v or higher to enable device; connect to 0.5v or less to disable device; connect to a pwm signal to achieve leds brightness dimming 5 v out output pin. connect to the cathode of internal schottky diode 6 v in input supply pin. must be connected to a local bypass capacitor
data sheet white led step-up converter ap3019a mar. 2010 rev. 1.7 bcd semiconductor manufacturing limited 3 functional block diagram figure 3. functional block diagram of ap3019a ordering information ap3019a - circuit type package k: sot-23-6 tr: tape & reel kt: tsot-23-6 package temperature range part number marking id packing type sot-23-6 -40 to 85 c AP3019AKTR-G1 gas tape & reel tsot-23-6 -40 to 85 c ap3019akttr-g1 l8e tape & reel bcd semiconductor's pb-free products, as designated with "g1" suffix in the part number, are rohs compliant and green. g1: green
data sheet white led step-up converter ap3019a mar. 2010 rev. 1.7 bcd semiconductor manufacturing limited 4 absolute maximum ratings (note 1) parameter symbol value unit input voltage v in 20 v sw pin voltage v sw 38 v feedback voltage v fb 20 v ctrl pin voltage v ctrl 20 v thermal resistance (junction to ambient, no heat sink) ja 265 c/w operating junction temperature t j 150 c storage temperature range t stg -65 to 150 c lead temperature (soldering, 10sec) t lead 260 c esd (machine model) 250 v esd (human body model) 2000 v note 1: stresses greater than those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under ?recommended operating co nditions? is not implied. exposure to ?absolute maximum ratings? for extended periods may affect device reliability. recommended operating conditions parameter symbol min max unit operating temperature range t op -40 85 c input voltage v in 2.5 16 v ctrl pin voltage v ctrl 16 v
data sheet white led step-up converter ap3019a mar. 2010 rev. 1.7 bcd semiconductor manufacturing limited 5 electrical characteristics v in =3v, v ctrl =3v, t a =25c, unless otherwise specified. parameter symbol conditions min typ max unit minimum operating voltage v in (min) 2.5 maximum operating voltage v in (max) 16 v feedback voltage (note 2) v fb i out =20ma, 4 leds, t a =-40 o c to 85 o c 188 200 212 mv fb pin bias current i fb 35 100 na quiescent current i q v fb =v in , no switching 1.5 2.5 3.2 ma shutdown quiescent current i shdn v ctrl =0v 2.0 4.0 6.0 a switching frequency f 0.9 1.2 1.5 mhz maximum duty cycle d max 90 93 % d=40% 550 switch current limit (note 3) i limit d=80% 550 ma switch v ce saturation voltage v cesat i sw =250ma 360 mv switch leakage current v sw =5v 0.01 5 a high 1.8 ctrl pin voltage v ctrl low 0.5 v ctrl pin bias current i ctrl 100 a ovp voltage v ov 30 v schottky forward drop v drop i d =150ma 0.7 v v r (reverse voltage)=23v 0.1 4 schottky leakage current v r (reverse voltage)=27v 150 a soft start time t 300 s sot-23-6 60 thermal resistance (junction to case) jc tsot-23-6 60 c/w note 2: the bold type specificat ions of full temperature range are guaranteed by design (gbd). note 3: the switch current limit is related to duty cycle. please refer to figure 15 for detail.
data sheet white led step-up converter ap3019a mar. 2010 rev. 1.7 bcd semiconductor manufacturing limited 6 typical performance characteristics wled forward voltage (v f ) is 3.45v at i f =20ma, unless otherwise noted. figure 4. efficiency vs. junction temperature figure 5. efficiency vs. input voltage figure 6. efficiency vs. led?s number figure 7. schottky forward current vs. schottky forward drop 3.0 3.5 4.0 4.5 5.0 70 72 74 76 78 80 82 84 86 i out =20ma, 8 leds,t a =25 o c c in =1 f, c out =0.22 f, l=22 h efficiency (%) input voltage (v) -50 -25 0 25 50 75 100 73 74 75 76 77 78 79 80 81 82 83 v in =3.6v, i out =20ma, 8 leds c in =1 f, c out =0.22 f, l=22 h efficiency (%) junction temperature ( o c) 2345678 76 77 78 79 80 81 82 83 84 85 86 v in =3.6v, i out =20ma,t a =25 o c c in =1 f, c out =0.22 f, l=22 h led's number efficiency (%) 0 200 400 600 800 1000 0 50 100 150 200 250 300 350 schottky forward current (ma) schottky forward drop (mv)
data sheet white led step-up converter ap3019a mar. 2010 rev. 1.7 bcd semiconductor manufacturing limited 7 typical performance characteristics (continued) wled forward voltage (v f ) is 3.45v at i f =20ma, unless otherwise noted. figure 8. shutdown quiescent current vs. input voltage figure 9. quiescent cu rrent vs. input voltage figure 10. input current in output open circuit figure 11. frequency vs. junction temperature vs. input voltage -50 -25 0 25 50 75 100 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 frequency (mhz) junction temperature ( o c) 2 4 6 8 10 12 14 16 0 5 10 15 20 25 30 shutdown quiescent current ( a) input voltage (v) t a =25 o c 0 2 4 6 8 10 12 14 16 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 quiescent current (ma) input voltage (v) t a =-50 o c t a =25 o c t a =100 o c 2.53.03.54.04.55.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 input current (ma) input voltage (v)
data sheet white led step-up converter ap3019a mar. 2010 rev. 1.7 bcd semiconductor manufacturing limited 8 typical performance characteristics (continued) wled forward voltage (v f ) is 3.45v at i f =20ma, unless otherwise noted. figure 12. feedback voltage vs. figure 13. schottky forward drop vs. junction temperature junction temperature figure 14. schottky leakage current vs. figure 15. current limit vs. duty cycle junction temperature -50 -25 0 25 50 75 100 190 192 194 196 198 200 202 204 206 208 210 feedback voltage (mv) junction temperature ( o c) -50 -25 0 25 50 75 100 0.60 0.62 0.64 0.66 0.68 0.70 0.72 0.74 0.76 0.78 0.80 schottky forward drop (v) junction temperature ( o c) i d =150ma -50 -25 0 25 50 75 100 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 schottky leakage current ( a) junction temperature ( o c) v r =10v v r =16v v r =23v 30 40 50 60 70 80 90 100 200 300 400 500 600 700 -50 o c 25 o c 100 o c current limit (ma) duty cycle (%)
data sheet white led step-up converter ap3019a mar. 2010 rev. 1.7 bcd semiconductor manufacturing limited 9 typical performance characteristics (continued) wled forward voltage is 3.45v at i f =20ma, unless otherwise noted. figure 16. saturation voltage vs. switch current figure 17. ctrl pin voltage vs. junction temperature 50 100 150 200 250 300 50 100 150 200 250 300 350 400 450 saturation voltage (mv) switch current (ma) -50 -25 0 25 50 75 100 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 ctrl pin voltage (v) junction temperature ( o c) falling edge rising edge
data sheet white led step-up converter ap3019a mar. 2010 rev. 1.7 bcd semiconductor manufacturing limited 10 i in 10 0m a/ di v v out 5v /d iv v ctrl 2v /d iv ti me 1 00 led 1 i mv 200 r = application information operation the ap3019a is a boost dc-dc converter which uses a constant frequency, current mode control scheme to provide excellent line and load regulation. operation can be best understood by referring to the figure 3. at the start of each oscillator cycle, the sr latch is set and switch q1 turns on. the switch current will increase linearly. the voltage on sense resistor is proportional to the switch current. the output of the current sense amplifier is added to a stabilizing ramp and the result is fed into the non-inversion input of the pwm comparator a2. when this voltage exceeds the output voltage level of the error amplifier a1, the sr latch is reset and the switch is turned off. it is clear that the voltage level at inversion input of a2 sets the peak current level to keep the output in regulation. this voltage level is the output signal of error amplifier a1, and is the amplified signal of the voltage difference between feedback voltage and reference voltage of 200mv. so, a constant output current can be provided by this operation mode. figure 18. typical application circuit to decide r1 led current control refer to figure 18, the led current is controlled by the feedback resistor r1. leds' current accuracy is determined by the regulator's feedback threshold accuracy and is independen t of the led's forward voltage variation. so the precise resistors are preferred. the resistance of r1 is in inverse proportion to the led curre nt since the feedback reference is fixed at 200mv. the relation for r1 and led current can be expressed as below: over voltage protection the ap3019a has an internal open-circuit protection circuit. when the leds are disconnected from circuit or fail open, the output voltage is clamped. the ap3019a will switch at a low frequency, and minimize input current. soft start the ap3019a has an internal soft start circuit to limit the inrush current during startup. the time of startup is controlled by internal soft start capacitor. please refer to figure 19. figure 19. soft start waveform v in =3.6v, 5 leds, i led =20ma dimming control two typical types of dimming control circuit are present as below. first, controlling ctrl pin voltage to change operation state is a good choice. second, changing the feedback voltage to get appropriate duty and luminous intensity is also useful. (1) adding a control signal to ctrl pin adding a pwm signal to ctrl pin directly. the ap3019a is turned on or off by the pwm signal when it is applied on the ctrl pin. the typical frequency of this pwm signal can be up to 2khz. please refer to figure 20. figure 20. dimming control using a pwm signal in ctrl pin ap3019a ctrl up to 2khz
data sheet white led step-up converter ap3019a mar. 2010 rev. 1.7 bcd semiconductor manufacturing limited 11 application information (continued) (2) changing the effective feedback voltage there are three methods to change the effective feedback voltage. first, adding a constant dc voltage through a resistor divider to fb pin can control the dimming. changing the dc voltage or resistor between the fb pin and the dc voltage can get appropriate luminous intensity. comparing with all kinds of pwm signal control, this method features a stable output voltage and leds current. please refer figure 21. figure 21. dimming control using dc voltage second, using a filtered pwm signal can do it. the filtered pwm signal can be considered as a varying and adjustable dc voltage. figure 22. dimming control using a filtered pwm voltage third, using a logic signal to change the feedback voltage. for example, the fb pin is connected to the gnd through a mosfet and a resistor. and this mosfet is controlled a logic signal. the luminous intensity of leds will be changed when the mosfet turns on or off. figure 23. dimming control using logic signal
data sheet white led step-up converter ap3019a mar. 2010 rev. 1.7 bcd semiconductor manufacturing limited 12 typical application c: x5r or x7r dielectric l: sumida cdrh5d28r-220nc or equivalent this circuit can work in full temperature figure 24. typical application of ap3019a
data sheet white led step-up converter ap3019a mar. 2010 rev. 1.7 bcd semiconductor manufacturing limited 13 mechanical dimensions sot-23-6 unit: mm(inch) 2.820(0.111) 3.020(0.119) 0.950(0.037)typ 1.800(0.071) 2.000(0.079) 0.300(0.012) 0.400(0.016) 0.700(0.028)ref 0.100(0.004) 0.200(0.008) 0 8 0.200(0.008) 0.300(0.012) 0.600(0.024) 0.000(0.000) 0.100(0.004) 0.900(0.035) 1.300(0.051) 1.450(0.057) max 123 4 5 6 pin 1 dot by marking
data sheet white led step-up converter ap3019a mar. 2010 rev. 1.7 bcd semiconductor manufacturing limited 14 mechanical dimensions (continued) tsot-23-6 unit: mm(inch) 2.800(0.110) 3.000(0.118) 1.500(0.059) 1.700(0.067) 2.600(0.102) 3.000(0.118) 0.950(0.037) bsc 1.900(0.075) bsc 0.700(0.028) 0.900(0.035) 0.000(0.000) 0.100(0.004) 0.350(0.014) 0.510(0.020) 0 8 0.370(0.015) min 0.100(0.004) 0.250(0.010) 0.250(0.010) bsc gauge plane r0.100(0.004) min pin 1 dot by marking 1.000(0.039) max
important notice bcd semiconductor manufacturing limited reserves the right to make changes without further not ice to any products or specifi- cations herein. bcd semiconductor manufacturing limited does not as sume any responsibility for us e of any its products for any particular purpose, nor does bcd semiconductor manufacturi ng limited assume any liability aris ing out of the application or use of any its products or circui ts. bcd semiconductor manufacturing limited does not convey any license under its patent rights or other rights nor the rights of others. - wafer fab shanghai sim-bcd semiconductor manufacturing co., ltd. 800 yi shan road, shanghai 200233, china tel: +86-21-6485 1491, fax: +86-21-5450 0008 main site regional sales office shenzhen office shanghai sim-bcd semiconductor manuf acturing co., ltd., shenzhen office unit a room 1203, skyworth bldg., gaoxin ave.1.s., nanshan district, shenzhen, china tel: +86-755-8826 7951 fax: +86-755-8826 7865 taiwan office bcd semiconductor (taiwan) company limited 4f, 298-1, rui guang road, nei-hu district, taipei, taiwan tel: +886-2-2656 2808 fax: +886-2-2656 2806 usa office bcd semiconductor corp. 30920 huntwood ave. hayward, ca 94544, usa tel : +1-510-324-2988 fax: +1-510-324-2788 - headquarters bcd semiconductor manufacturing limited no. 1600, zi xing road, shanghai zizhu sc ience-based industrial park, 200241, china tel: +86-21-24162266, fax: +86-21-24162277 bcd semiconductor manufacturing limited important notice bcd semiconductor manufacturing limited reserves the right to make changes without further not ice to any products or specifi- cations herein. bcd semiconductor manufacturing limited does not as sume any responsibility for us e of any its products for any particular purpose, nor does bcd semiconductor manufacturi ng limited assume any liability aris ing out of the application or use of any its products or circui ts. bcd semiconductor manufacturing limited does not convey any license under its patent rights or other rights nor the rights of others. - wafer fab shanghai sim-bcd semiconductor manufacturing limited 800, yi shan road, shanghai 200233, china tel: +86-21-6485 1491, fax: +86-21-5450 0008 bcd semiconductor manufacturing limited main site regional sales office shenzhen office shanghai sim-bcd semiconductor manuf acturing co., ltd. shenzhen office advanced analog circuits (shanghai) corporation shenzhen office room e, 5f, noble center, no.1006, 3rd fuzhong road, futian district, shenzhen 518026, china tel: +86-755-8826 7951 fax: +86-755-8826 7865 taiwan office bcd semiconductor (taiwan) company limited 4f, 298-1, rui guang road, nei-hu district, taipei, taiwan tel: +886-2-2656 2808 fax: +886-2-2656 2806 usa office bcd semiconductor corporation 30920 huntwood ave. hayward, ca 94544, u.s.a tel : +1-510-324-2988 fax: +1-510-324-2788 - ic design group advanced analog circuits (shanghai) corporation 8f, zone b, 900, yi shan road, shanghai 200233, china tel: +86-21-6495 9539, fax: +86-21-6485 9673 bcd semiconductor manufacturing limited http://www.bcdsemi.com bcd semiconductor manufacturing limited

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