dc/dc converter pf754-03 sci7654m 0a /c 0a description the sci7654 is a highly efficient, but low power-consumption dc-to-dc converter based on the advanced cmos technologies. it can generate an output voltage double/triple/quadruple times higher than the input (in negative direction) if 4/3/2 external capacitors are attached. with a built-in voltage regulator, the sci7654 can provide a stable output by setting the dc/dc output to any voltage via two external resistors. this is optimum to the lcd panel power supply as the stable output can have the negative temperature gradient required for an lcd panel. features an input voltage can be boosted double/triple/quadruple to negative potential. input voltages: ?.4 to ?.5v (quadruple boosting), ?.4 to ?.3v (triple boosting), ?.4 to ?1.0v (double boosting) excellent vol tage conversion efficiency: 95% (typ.) large output current: 20 ma (max.) during quadruple boosting built-in voltage regulator (for stable voltage output) built-in reference voltage source for accurate regulation: ?.5 0.05v (ct0) regulator output voltage temperature gradient function: ?.04, ?.15, ?.35, ?.55%/?c low current consumption: 130 a (typ.) low standby current: 5.0 a (max.) built-in oscillator circuit 5/6-time voltage boosting in negative potential by serial connection package: sci7654m 0a ssop2-16pin (plastic), sci7654c 0a dip-16pin (plastic) block diagram double/triple/quadruple boosting 95% excellent power conversion efficiency built-in voltage regulator v dd poff1 poff2 fc v in c1p c2p c1n c3n c2n tc1 tc2 rv v reg v ri v out power-off control clock generator voltage converter booster control ref. voltage circuit voltage regulator ( datasheet : )
sci7654m 0a /c 0a 2 pin configuration pin description 1 8 2 3 4 5 6 7 16 9 15 14 13 12 11 10 c2p c2n c3n c1n c1p v in poff1 poff2 v out v ri v reg rv v dd fc tc1 tc2 ssop2-16pin/dip-16pin pin no. pin name function 1v out voltage output 2v ri regulator input 3v reg regulator output 4 rv input for regulator output voltage adjustment 5v dd input voltage pin (positive) 6 fc internal clock rate switch input, and clock input in serial/parallel connection (common input pin) 7 tc1 input for regulator output temperature gradient setup (1) 8 tc2 input for regulator output temperature gradient setup (2) 9 poff2 power-off control input (2) 10 poff1 power-off control input (1) 11 v in input voltage pin (negative) 12 c1p common double and quadruple boosting capacitor positive pin 13 c1n double boosting capacitor negative pin 14 c3n quadruple boosting capacitor negative pin 15 c2n triple boosting capacitor negative pin 16 c2p triple boosting capacitor positive pin
3 sci7654m 0a /c 0a electrical characteristics (unless otherwise designated: ta= 30 v to +85 c, v dd =0v, v in = 5.0v) rating symbol min. max. unit remark input power voltage v in -26.0/n v dd +0.3 v n=boosting time; at v in pin input pin voltage v i v in -0.3 v dd +0.3 v poff1, poff2 tc1, tc2, fc pins output pin voltage 1 v 0c1 v in -0.3 v dd +0.3 v at c1p and c2p pins output pin voltage 2 v oc2 2 v in -0.3 v in +0.3 v at c1n pin output pin voltage 3 v oc3 3 v in -0.3 2 v in +0.3 v at c2n pin output pin voltage 4 v oc4 4 v in -0.3 3 v in +0.3 v at c3n pin regulator input power voltage v ri n v in -0.3 v dd +0.3 v n=boosting time; at v ri pin regulator input pin voltage v rv n v in -0.3 v dd +0.3 v n=boosting time; at rv pin output voltage v 0 n v in -0.3 v dd +0.3 v n=boosting time; at v out and v reg pins input current i in 80 ma at v in pin output current i out n 4: 20 ma n=boosting time; at v out n>4: 80/n and v reg pins allowable loss p d 210 mw operating temperature t opr -30 85 ? c storage temperature t stg -55 150 ? c soldering temperature and time t sol 260 10 ? c . s temperature at leads absolute maximum ratings characteristic symbol condition min. typ. max. unit input power voltage 1 v in1 during quadruple boosting -5.5 -2.4 v input power voltage 2 v in2 during triple boosting -7.3 -2.4 v input power voltage 3 v in3 during double boosting -11 -2.4 v input power voltage n v inn during large-time boosting using -22/n -2.4 v external diodes boost startup input power voltage v sta n=boosting time, i out <200 a, -22/n -2.4 v fc=vdd booster output voltage v out -22 v regulator input voltage v ri -22 -2.4 v regulator output voltage v reg i reg =0, v ri =-22v, -2.4 v r rv =1m ? booster output impedance r out i out=10ma, during quadruple 200 300 boosting booster power conversion p eff i out =2 ma; during quadruple 95 % efficiency boosting; c1, c2, c3, c out =10 f tantalum booster operating current i opr1 fc=v dd , poff1=v in , poff2=v dd ; 130 220 a consumption 1 during no loading; c1, c2, c3, c out =10 f tantalum booster operating current i opr2 fc=v in , poff1=v in , poff2=v dd ; 520 880 a consumption 2 during no loading; c1, c2, c3, c out =10 f tantalum regulator operating current i opvr v ri =-20 v, during no loading, 10 15 a consumption r rv =1 m
sci7654m 0a /c 0a 4 characteristic symbol condition min. typ. max. unit static current i q poff1=v in , poff2=v in , fc=v dd 5.0 a input leakage current i lin at poff1, poff2, fc, tc1, tc2 pins 0.5 a stable output saturation r sat 0 |