unisonic technologies co., ltd me7660 cmos ic www.unisonic.com.tw 1 of 5 copyright ? 2011 unisonic technologies co., ltd qw-r502-730.a charge pump dc-dc voltage converter ? description me7660 is a charge pump dc-dc voltage converter using al-gate cmos technology and optimization design. it converters a +1.5v to +10v input to a corresponding -1.5v to -10v output using only two external capacitors, eliminat ing inductors and their associated cost, size and emi. the on-board oscillator operates at a nominal frequency of 10khz. operation belo w 10 khz (for lower supply current applications) is possible by connecting an external capacitor from osc to ground. ? features * converts +5v logic supply to + 5v * wide input voltage range:1.5v~10v * efficient voltage conversion:99.9% * good power efficiency:98% * low power supply:50ua@5vin * only two external capacitors required * compatible with rs232 negative power supply standard * no dx diode needed for high voltage operation sop-8 ? ordering information ordering number package packing lead free halogen free me7660l-so8-r ME7660G-SO8-R sop-8 tape reel me7660l-so8-t me7660g-so8-t sop-8 tube me7660l-s08-r (1)packing type (2)package type (1) r: tape reel, t: tube (2) s08: sop-8 (3) g:halogen free, l: lead free (3)lead free
me7660 cmos ic unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r502-730.a ? pin configuration gnd 1 2 3 4 8 7 6 5 nc cap + v out lv osc cap - v + ? pin description pin no. symbol description 1 nc no connection 2 cap + connection external capacitor (+) pin 3 gnd ground pin 4 cap - connection external capacitor (-) pin 5 v out voltage output pin 6 lv low voltage selection pin 7 osc connecting oscillation capacitor pin 8 v + power supply pin
me7660 cmos ic unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r502-730.a ? block diagram rc oscillator voltage-level translator 1/2 internal voltage regulator logic network cap - (8) (7) (6) (2) (4) (5) (3) s1 s2 s3 s4 cap v out v osc lv gnd
me7660 cmos ic unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r502-730.a ? absolute maximum rating parameter symbol ratings unit supply voltage v in 10.5 v lv and osc inputs voltage v + <5.5v v l x -0.3~(v + +0.3) v v + >5.5v v osc (v + -5.5)~(v + +0.3) v power dissipation(t a 75 ) p d 470 mw current into lv v + >3.5v i lv 20 ua operating temperature t opr -40 ~ +85 storage temperature t stg -65 ~ +150 ? electrical characteristics (v + =5v,c osc =0) parameter symbol test conditions min typ max unit supply current i + r l = 60 120 ua supply voltage high v + h lv open 3 10 v low v + l lv to gnd 1.5 4 v output resistance r out i out =20ma, t a =2 5 110 i out =3ma, v + =2v,t a =2 5 220 oscillator frequency f osc pin 7 open 10 khz power efficiency p eff r l =5k 90 98 % v oltage conversion efficiency v eff r l = 98 99.9 %
me7660 cmos ic unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r502-730.a ? testing circuit ? typical application circuit above figure is the basic application circuit to provide a negative supply from -1.5v ~ -10v while a positive supply from +1.5v ~ +10v is available. when v + =+5v, the output resistance is about 100 ; the output voltage is -4v while the load current is 10ma. utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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