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sot-23-5 pwm step-up dc/dc converter controller r1210nxx2x series no. ea-064-0508 1 outline the r1210nxx2c/xx2d series are cmos-based pwm step-up dc/dc converter controllers, with high accuracy, low supply current. each of the r1210nxx2x series consists of an oscillator, a pwm circuit, a reference voltage unit, an error amplifier, phase compensation circuit, resistors for voltage detection, a chip enable circuit, a controller against drastic load transient and an output voltage detector. a low ripple, high efficiency step-up dc/dc converter can be composed of this ic with only four external component s, or an inductor, a diode, a transistor and a capacitor. the r1210nxx2x series can detect drastic change of output voltage with a circuit controller, the load transient response is improved. each of the r1210nxx2x series has a driver pin, or ? ext? pin for external transistor. by connecting a power transistor with low on-resistance to ext pin, a large curr ent flows through an inductor, thus, large output current can be supplied. the built-in chip enable circuit can make the standby mode with ultra low quiescent current. since the package for these ics is small sot-23-5, hi gh density mounting of the ics on board is possible. features ? external components .......................................only an inductor, a diode, a capacitor, and a transistor ? standby current ................................................typ. 0 a ? low temperature-drift coefficient of output voltage typ. 100ppm/ c ? output voltage ..................................................st epwise setting with a step of 0.1v in the range of 2.2v to 6.0v ? two choices of basic oscillator fr equency ......100khz (xx2 c), 180khz (xx2d) ? small package ..................................................sot- 23-5 (mini-mold) ? low ripple, low noise ? oscillator start-up vo ltage ................................max. 0.8v applications ? power source for battery-powered equipment. ? power source for portable communication appliances, cameras, vcrs ? power source for appliances of which require higher voltage than battery voltage.
r1210nxx2x 2 block diagrams 4 2 v out ext ce gnd buffer osc pwm controller phase comp. vref circuit chip enable - + - + - + 1 5 selection guide in the r1210n series, the output voltage, the oscillator frequency, the optional function, and the taping type for the ics can be selected at the user?s request. the selection can be made by designating the part number as shown below; r1210nxx 2x-xx part number a b c d code contents a setting output voltage(v out ): stepwise setting with a step of 0.1v in the range of 2.2v to 6.0v b designation of driver 2: external tr. driver c designation of oscillator frequency c: 100khz d: 180khz d designation of taping type; ex.: tr, tl (refer to taping specification) ?tr? is prescribed as a standard.
r1210nxx2x 3 pin configuration sot-23-5 5 4 l x gnd (mark side) 12 3 ce v out nc pin descriptions pin no symbol pin description 1 ce chip enable pin 2 v out pin for output voltage 3 nc no connection 4 gnd ground pin 5 ext external transistor drive pin absolute maximum ratings symbol item rating unit v out v out pin output voltage 9.0 v v ext ext pin output voltage -0.3~ v out + 0.3 v v ce ce pin input voltage 9.0 v i ext ext pin output current 40 ma p d power dissipation 250 mw topt operating temperature range ? 40 ~ + 85 c tstg storage temperature range ? 55 ~ + 125 c
r1210nxx2x 4 electrical characteristics ? r1210nxx2x topt=25c symbol item conditions min. typ. max. unit v out output voltage v in =v set 0.6, i out =1ma 0.975 1.025 v v in maximum input voltage 8 v ? v out / ? t step-up output voltage temperature coefficient ? 40 c < = < = c 100 ppm/ c vstart start-up voltage v in = 0v 2v 0.8 v istandby supply current 3(standby) v out =6.5v,v ce = 0v 0.5 a 18 35 a (xx2c) v out = v set 0.96 ext at no load 2.2v < = < = a (xx2d) 20 40 a (xx2c) v out = v set 0.96 ext at no load 2.5v < = < = a (xx2d) 25 50 a (xx2c) v out = v set 0.96 ext at no load 3.1v < = < = a (xx2d) 30 60 a (xx2c) v out = v set 0.96 ext at no load 4.0v < = < = a (xx2d) 35 70 a (xx2c) v out = v set 0.96 ext at no load 4.5v < = < = a (xx2d) 45 90 a (xx2c) v out = v set 0.96 ext at no load 5.0v < = < = a (xx2d) 50 100 a (xx2c) i dd1 supply current 1 v out = v set 0.96 ext at no load 5.5v < = < = a (xx2d) 10 15 a (xx2c) i dd2 supply current 2 v out =v ce =v set +0.5 15 22 a (xx2d)
r1210nxx2x 5 symbol item conditions min. typ. max. unit 2.2v < = < = < = < = < = < = < = < = < = < = < = < = < = < = < = < = 0.96 144 180 216 khz (xx2d) 0.5 khz/ c (xx2c) ? fosc/ ? t oscillator frequency temperature coefficient ? 40 c < = < = c 0.6 khz/ c (xx2d) maxdty oscillator maximum duty cycle v out =v ce =v set 0.96, (v ext ?h? side) 70 85 97 % 2.2v < = < = < = < = < = < = < = < = < = < = < = < = < = < = < = < = 0.96 0.9 v v cel ce ?l? input voltage v out =v set 0.96 0.3 v i ceh ce ?h? input current v out =v ce =6.5v -0.1 0.0 0.1 a i cel ce ?l? input current v in =6.5v, v ce =0v -0.1 0.0 0.1 a *note: v set means setting output voltage.
r1210nxx2x 6 test circuits l tr v in cb c l rb sd ext gnd v out ce v ext v out gnd ce c oscilloscope test circuit 1 test circuit 2 ext gnd ce v out a ext gnd ce v out a test circuit 3 test circuit 4 oscilloscope ext gnd ce v out c oscilloscope ext gnd ce v out test circuit 5 test circuit 6 inductor (l) : 27 h (sumida electric co., ltd. cd104) diode (sd) : rb491d (rohm, schottky type) capacitor (cl) : 47 f 2 (tantalum type) transistor (tr) : 2sd1628g base resistor (rb) : 300 ? base capacitor (cb) : 0.01 f(ceramic type) the typical characteristics were obtained by use of these test circuits. test circuit 1 : typical characteristics 1) 2) 3) 4) 5) test circuit 2 : typical characteristics 9) 10) test circuit 3 : typical characteristics 6) 7) test circuit 4 : typical characteristics 8) test circuit 5 : typical characteristics 11) test circuit 6 : typical characteristics 12)
r1210nxx2x 7 typical characteristics 1) output voltage vs. output current r1210n302c r1210n302d l:27 h v in :1.5v v in :2.0v v in :2.5v v in :0.9v output current i out (ma) 0 200 400 600 800 3.2 3.1 3.0 2.9 2.8 output voltage v out (v) l:27 h v in :1.5v v in :2.0v v in :2.5v v in :0.9v output current i out (ma) 0 200 400 600 800 3.2 3.1 3.0 2.9 2.8 output voltage v out (v) r1210n502c r1210n502d l:27 h v in :3.0v v in :2.0v v in :4.0v v in :1.5v output current i out (ma) 0 200 400 600 800 5.4 5.2 5.0 4.8 4.6 4.4 output voltage v out (v) l:27 h v in :3.0v v in :2.0v v in :4.0v v in :1.5v output current i out (ma) 0 200 400 600 800 5.4 5.2 5.0 4.8 4.6 4.4 output voltage v out (v) 2) efficiency vs. output current r1210n302c r1210n302d l:27 h v in :2.5v v in :1.5v v in :2.0v v in :0.9v output current i out (ma) 0 200 400 600 800 100 80 60 40 20 0 efficiency (%) l:27 h v in :2.5v v in :1.5v v in :2.0v v in :0.9v output current i out (ma) 0 200 400 600 800 100 80 60 40 20 0 efficiency (%)
r1210nxx2x 8 r1210n502c r1210n502d l:27 h v in :4.0v v in :2.0v v in :1.5v v in :3.0v output current i out (ma) 0 200 400 600 800 100 80 60 40 20 0 efficiency (%) l:27 h v in :4.0v v in :2.0v v in :1.5v v in :3.0v output current i out (ma) 0 200 400 600 800 100 80 60 40 20 0 efficiency (%) 3) ripple voltage vs. output current r1210n302c r1210n302d l:27 h v in :2.5v v in :0.9v v in :1.5v output current i out (ma) 0 200 400 600 800 280 240 200 160 120 80 40 0 ripple voltage vripple (mv) l:27 h v in :2.5v v in :0.9v v in :1.5v output current i out (ma) 0 200 400 600 800 280 240 200 160 120 80 40 0 ripple voltage vripple (mv) r1210n502c r1210n502d l:27 h v in :4.0v v in :1.5v v in :3.0v output current i out (ma) 0 200 400 600 800 280 240 200 160 120 80 40 0 ripple voltage vripple (mv) l:27 h v in :4.0v v in :0.9v v in :1.5v v in :3.0v output current i out (ma) 0 200 400 600 800 280 240 200 160 120 80 40 0 ripple voltage vripple (mv)
r1210nxx2x 9 4) start-up voltage/ hold-on voltage vs. output current (topt=25c) r1210n302c r1210n302d l:27h vhold vstart output current i out (ma) 0 20 40 60 100 80 1.6 1.2 0.8 0.4 0.0 start-up/hold-on voltage vstart/vhold(v) start-up/hold-on voltage vstart/vhold(v) l:27h vhold vstart output current i out (ma) 0 20 40 60 100 80 1.6 1.2 0.8 0.4 0.0 r1210n502c r1210n502d start-up/hold-on voltage vstart/vhold(v) l:27h vhold vstart output current i out (ma) 0 20 40 60 100 80 1.6 1.2 0.8 0.4 0.0 start-up/hold-on voltage vstart/vhold(v) l:27h vhold vstart output current i out (ma) 0 20 40 60 100 80 1.6 1.2 0.8 0.4 0.0 5) output voltage vs. temperature r1210n302c r1210n302d output voltage v out (v) l:27h i out :30ma i out :0ma i out :100ma temperature topt( c) -50 -25 0 25 50 100 75 3.10 3.05 3.00 2.95 2.90 output voltage v out (v) l:27h i out :30ma i out :0ma i out :100ma temperature topt( c) -50 -25 0 25 50 100 75 3.10 3.05 3.00 2.95 2.90
r1210nxx2x 10 r1210n502c r1210n502d output voltage v out (v) l:27h i out :30ma i out :0ma i out :100ma temperature topt( c) -50 -25 0 25 50 100 75 5.15 5.10 5.05 5.00 4.95 4.90 4.85 output voltage v out (v) l:27h i out :30ma i out :0ma i out :100ma temperature topt( c) -50 -25 0 25 50 100 75 5.15 5.10 5.05 5.00 4.95 4.90 4.85 6) supply current 1 vs. temperature r1210n302c r1210n302d supply current i ss 1( a) temperature topt( c) -50 -25 0 25 50 100 75 40 30 20 10 0 supply current i ss 1( a) temperature topt( c) -50 -25 0 25 50 100 75 40 30 20 10 0 r1210n502c r1210n502d supply current i ss 1( a) temperature topt( c) -50 -25 0 25 50 100 75 80 60 40 20 0 supply current i ss 1( a) temperature topt( c) -50 -25 0 25 50 100 75 80 60 40 20 0
r1210nxx2x 11 7) supply current 2 vs. temperature r1210n302c r1210n302d supply current2 i ss 2( a) temperature topt( c) -50 -25 0 25 50 100 75 25 60 15 10 0 5 supply current2 i ss 2 ( a) temperature topt( c) -50 -25 0 25 50 100 75 25 60 15 10 0 5 r1210n502c r1210n502d supply current2 i ss 2 ( a) temperature topt( c) -50 -25 0 25 50 100 75 25 60 15 10 0 5 supply current2 i ss 2 ( a) temperature topt( c) -50 -25 0 25 50 100 75 25 60 15 10 0 5 8) supply current 3 vs. temperature r1210n302c r1210n302d temperature topt( c) supply current 3 istandby ( a) 0 0.0 -0.2 0.4 0.2 0.8 1.0 0.6 25 100 75 50 -50 -25 supply current3 istandby( a) temperature topt( c) -50 -25 0 25 50 100 75 1.0 0.8 0.6 0.4 0.2 -0.2 0.0
r1210nxx2x 12 r1210n502c r1210n502d supply current3 istandby( a) temperature topt( c) -50 -25 0 25 50 100 75 1.0 0.8 0.6 0.4 0.2 -0.2 0.0 supply current3 istandby( a) temperature topt( c) -50 -25 0 25 50 100 75 1.0 0.8 0.6 0.4 0.2 -0.2 0.0 9) oscillator frequency vs. temperature r1210n302c r1210n302d oscillator frequency fosc(khz) temperature topt( c) -50 -25 0 25 50 100 75 300 250 200 150 100 0 50 oscillator frequency fosc(khz) temperature topt( c) -50 -25 0 25 50 100 75 300 250 200 150 100 0 50 r1210n502c r1210n502d oscillator frequency fosc(khz) temperature topt( c) -50 -25 0 25 50 100 75 300 250 200 150 100 0 50 oscillator frequency fosc(khz) temperature topt( c) -50 -25 0 25 50 100 75 300 250 200 150 100 0 50
r1210nxx2x 13 10) maximum duty cycle vs. temperature r1210n302c r1210n302d maximum duty cycle duty(%) temperature topt( c) -50 -25 0 25 50 100 75 100 90 80 70 60 40 50 maximum duty cycle duty(%) temperature topt( c) -50 -25 0 25 50 100 75 100 90 80 70 60 40 50 r1210n502c r1210n502d maximum duty cycle duty(%) temperature topt( c) -50 -25 0 25 50 100 75 100 90 80 70 60 40 50 maximum duty cycle duty(%) temperature topt( c) -50 -25 0 25 50 100 75 100 90 80 70 60 40 50 11) ext ?h? output current vs. temperature r1210n302c r1210n302d ext "h" output current i exth (ma) temperature topt( c) -50 -25 0 25 50 100 75 20 15 10 0 5 ext "h" output current i exth (ma) temperature topt( c) -50 -25 0 25 50 100 75 20 15 10 0 5
r1210nxx2x 14 r1210n502c r1210n502d ext "h" output current i exth (ma) temperature topt( c) -50 -25 0 25 50 100 75 20 15 10 0 5 ext "h" output current i exth (ma) temperature topt( c) -50 -25 0 25 50 100 75 20 15 10 0 5 12) ext ?l? output current vs. temperature r1210n302c r1210n302d ext "l" output current i extl (ma) temperature topt( c) -50 -25 0 25 50 100 75 20 15 10 0 5 ext "l" output current i extl (ma) temperature topt( c) -50 -25 0 25 50 100 75 20 15 10 0 5 r1210n502c r1210n502d ext "l" output current i extl (ma) temperature topt( c) -50 -25 0 25 50 100 75 20 15 10 0 5 ext "l" output current i extl (ma) temperature topt( c) -50 -25 0 25 50 100 75 20 15 10 0 5
r1210nxx2x 15 13) ce ?h? input voltage vs. temperature r1210n602c r1210n602d ce "h" input voltage v ceh (v) temperature topt( c) -50 -25 0 25 50 100 75 0.9 0.8 0.7 0.6 0.5 0.3 0.4 ce "h" input voltage v ceh (v) temperature topt( c) -50 -25 0 25 50 100 75 0.9 0.8 0.7 0.6 0.5 0.3 0.4 14) ce ?l? input voltage vs. temperature r1210n602c r1210n602d ce "l" input voltage v cel (v) temperature topt( c) -50 -25 0 25 50 100 75 0.9 0.8 0.7 0.6 0.5 0.3 0.4 ce "l" input voltage v cel (v) temperature topt( c) -50 -25 0 25 50 100 75 0.9 0.8 0.7 0.6 0.5 0.3 0.4 15) output waveform at power-on (topt=25c) ((r1210n502c)) (v in : 0v 3.0v) i out : 1ma i out : 100ma m50.0ms v in v out 2v/div m50.0ms v in v out 2v/div
r1210nxx2x 16 ((r1210n502d)) (v in : 0v 3.0v) i out : 1ma i out : 100ma m50.0ms v in v out 2v/div m50.0ms v in v out 2v/div ((r1210n302c)) (v in : 0v 1.5v) i out : 1ma i out : 100ma m50.0ms v in v out 1v/div m50.0ms v in v out 1v/div ((r1210n302d)) (v in : 0v 1.5v) i out : 1ma i out : 100ma 1v/div m50.0ms v in v out m50.0ms v in v out 1v/div
r1210nxx2x 17 16) load transient response (topt=25c) ((r1210n502c)) (v in : 3.0v,i out :1ma 200ma) m50.0ms i out v out 200mv m50.0ms i out v out 200mv ((r1210n502d)) (v in : 3.0v,i out :1ma 200ma) m50.0ms i out v out 200mv m50.0ms i out v out 200mv ((r1210n302c)) (v in : 1.5v,i out :1ma 100ma) m50.0ms i out v out 100mv m50.0ms i out v out 100mv
r1210nxx2x 18 ((r1210n302d)) (v in : 1.5v,i out :1ma 100ma) m50.0ms i out v out 100mv m50.0ms i out v out 100mv

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