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 5 sci7654m 0a /c 0a functional description clock generator circuit as the sci7654 has a built-in clock generator circuit, it requires no external source at all. the clock rate changes depending on the fc pin signal level, and the low output or high output mode can be selected. this allows a frequency selection according to the current capacitance and load current when the booster output impedance changes depending on the clock rate and external booster capacitance. voltage converter circuit the voltage converter receives a clock from the clock generator, and boosts the v in input power voltage quadruple, triple or double. four converter circuits are required for quadruple boosting, three converts are required for triple boosting, and dual converters are required for double boosting. voltage step-up diagram (during -5v input) reference voltage circuit the sci7654 has a built-in reference voltage circuit for the voltage regulator. the temperature coefficient of reference voltage can be changed using pins tc1 and tc2, and a voltage having one of four types of temperature gradients can be output at v reg pin for lcd driving. v dd (0v) v in (-5v) -10v -15v -20v 10v 15v 20v double boosting triple boosting q uadru p le boostin g tc1 tc2 reference voltage, v ref (v) temperature coefficient, ct (%/ ? c) mode min. typ. max. min. typ. max. ct0 h(v dd ) h(v dd ) -1.55 -1.5 -1.45 -0.07 -0.04 0 ct1 h l(v in ) -1.70 -1.5 -1.30 -0.25 -0.15 -0.07 ct2 l(v in ) h -1.90 -1.5 -1.10 -0.45 -0.35 -0.20 ct3 l l -2.15 -1.5 -0.85 -0.75 -0.55 -0.30 fc pin mode clock rate current consumption output ripple h (v dd ) low output 4.0 khz (typ.) i op v rp l (v in ) high output 16.0 khz (typ.) approx. 4 times of i op approx. 1/4 time of v ri
sci7654m 0a /c 0a 6 function status mode poff1 poff2 oscillator booster regulator description ps1 h(v dd ) l(v in ) on on on all circuits are turned on. ps2 l l off off (*1) off (*2) all circuits are turned off. ps3 h h off on on slave side (booster and regulator) in parallel connection master side (for booster only) ps4 l h on on off in parallel connection; first stage in serial connection (*3) *1 when the booster circuit is off, approximately v in +0.6v voltage appears at v out pin. *2 when the regulator is off, the v reg pin is set to the high-impedance status. *3 the mode selected depends on the line connection at the second stage of serial connection. voltage regulator circuit the circuit receives a voltage from v ri pin, stabilizes it, and outputs at any voltage. the output is adjustable with a ratio of r1 and r2 external divider resistors. although the sum of divider resistors is desirable to be minimum to prevent an interference due to external noise, 100 to 1 megohms are recommended as the current consumption may be increased by the divider resistors. power off control the sci7654 has an automatic power-off function, and can turn on or off each function depending on the external signals entered in poff1 and poff2 pins. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 v out v ri v reg rv v dd fc tc1 tc2 c2p c2n c3n c1n c1p v in poff1 poff2 r 2 r 1
7 sci7654m 0a /c 0a reference circuit example four-time booster circuit this example drives the booster circuit only, boosts the v in input voltage four times in negative direction, and outputs it at the v out pin. however, this does not have a voltage regulator and the voltage at v out pin may have a ripple. four-time booster and regulator circuits this example receives a boost output from v out pin, stabilizes it via the voltage regulator circuit, and outputs a voltage having the temperature gradient at v reg pin via the temperature gradient selector circuit. v out v ri v reg rv v dd fc tc1 tc2 c2p c2n c3n c1n c1p v in poff1 poff2 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 + c 2 c 3 c 1 + + + c in + c out v out v dd v in v out v ri v reg rv v dd fc tc1 tc2 c2p c2n c3n c1n c1p v in poff1 poff2 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 + c 2 c 3 c 1 + + + c in + c out v reg v dd v in c reg + r 1 r 2
sci7654m 0a /c 0a 8 plastic ssop2-16pin package dimensions unit : mm (inch) 9 16 8 1 index 0.8 ( 0.031 ) 0.36 0.1 ( 0.014 ) 4.4 0.2 ( 0.173 ) +0.008 0.007 1.7 max ( 0.066 max ) +0.004 0.003 0.05 ( 0.002 ) 0.9 ( 0.035 ) 0 10 0.15 0.05 ( 0.006 ) +0.003 0.002 6.6 0.2 ( 0.26 ) +0.007 0.008 7 max ( 0.275 max ) 6.2 0.3 ( 0.244 0.011 ) 1.5 0.1 ( 0.059 0.003 ) 0.5 0.2 ( 0.02 ) +0.007 0.008
9 sci7654m 0a /c 0a 16 9 18 19.7 max ( 0.775 max ) 19 0.1 ( 0.748 0.003 ) 6.3 0.1 ( 0.248 0.003 ) 1.5 ( 0.059 ) 3 min ( 0.119 min ) 0.46 0.1 ( 0.018 ) +0.004 0.003 2.54 ( 0.1 ) 0 15 7.62 ( 0.3 ) 0.25 ( 0.01 ) +0.001 0 +0.03 0.01 0.8 0.1 ( 0.031 ) +0.004 0.003 4.4 0.1 ( 0.173 ) +0.004 0.003 unit : mm (inch) plastic dip-16pin
electronic devices marketing division ic marketing & engineering group ed international marketing department i (europe & u.s.a.) 421-8, hino, hino-shi, tokyo 191-8501, japan phone : +81-(0)42-587-5812 fax : +81-(0)42-587-5564 ed international marketing department ii (asia) 421-8, hino, hino-shi, tokyo 191-8501, japan phone : +81-(0)42-587-5814 fax : +81-(0)42-587-5110 notice: no part of this material may be reproduced or duplicated in any form or by any means without the written permission of seiko epson. seiko epson reserves the right to make changes to this material without notice. seiko epson does not assume any liability of any kind arising out of any inaccuracies contained in this material or due to its application or use in any product or circuit and, further, there is no representation that this material is applicable to products requiring high level reliability, such as, medical products. moreover, no license to any intellectual property rights is granted by implication or otherwise, and there is no representation or warranty that anything made in accordance with this material will be free from any patent or copyright infringement of a third party. this material or portions thereof may contain technology or the subject relating to strategic products under the control of the foreign exchange and foreign trade law of japan and may require an export license from the ministry of international trade and industry or other approval from another government agency. ? seiko epson corporation 2000 all right reserved. all other product names mentioned herein are trademarks and/or registered trademarks of their respective companies. first issue june, 1995 printed febr u ary, 2000 in japan t http://www.epson.co.jp/device/ epson electronic devices website
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