unisonic technologies co., ltd l1131c preliminary cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2011 unisonic technologies co., ltd qw-r502-308.c low noise 150ma ldo regulator ? description the utc l1131c is a typical ldo (linear regulator) with the features of high out put voltage accuracy, low supply current, low on-resistance, and high ripple rejection. during normal operation of utc l1131c , the dropout voltage is very low, and the response of line transient and load transient are very well. inside each utc l1131c , there?re many functions which can be seen in the block figure, for example, a voltage reference unit, an error amplifier, resistor-net for vo ltage setting, a current limit circuit, and a chip enable circuit. the utc l1131c can be used as an ideal of power source for hand-held communication equipment, such as cameras, vcrs, camcorders and other battery-powered equipment. ? features * ultra supply current: 75a(typ.) * standby mode: 0.1a(typ.) * very low dropout voltage: 0.28v(typ.) @ i out =150ma, v out =2.5v * ripple rejection: 70db(typ.) @ f=1khz 60db(typ.) @ f=10khz * temperature-drift coefficient of output voltage: 100ppm/c(typ.) * well line regulation: 0.02%/v(typ.) * output voltage a ccuracy: 2.0%(typ.) * internal fold back protection circuit * c in =c out =1f or more (ceramic capacitors) are recommended to be used with this ic ? ordering information ordering number package pin assignment packing lead free halogen free 1234 5 l1131cl-xx-af5-r L1131CG-XX-AF5-R sot-25 i g c n o tape reel note: pin assignment: i:v in o:v out g:gnd c:ce n:nc
l1131c preliminary cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-308.c ? marking package voltage code marking sot-25 20:2.0v 25:2.5v 3 2 1 hxx c g 5 4 voltage code g: halogen free l: lead free ? pin description pin no pin name description 1 v in input pin 2 gnd ground pin 3 ce input pin for chip enable, ?high? means enable the chip. 4 nc no connection 5 v out output pin
l1131c preliminary cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-308.c ? block diagram + - current limit reference voltage gnd v out ce v in
l1131c preliminary cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-308.c ? absolute maximum rating parameter symbol ratings unit input voltage v in 6.5 v input voltage (ce pin) v ce 6.5 v output voltage v out -0.3~v in +0.3 v output current i out 200 ma power dissipation p d 420 mw junction temperature t j +125 operating temperature t opr -40 ~ +85 storage temperature t stg -55 ~ +125 note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device operation is not implied. ? electrical characteristics l1131c-2.0v parameter symbol test conditions min typ max unit output voltage v out v in = set v out +1v, 1ma i out 30ma 1.96 2.04 v input voltage v in 6.0 v load regulation out out i v v in = set v out +1v 1ma i out 150ma 22 40 mv output current i out v in ? v out = 1.0v 150 ma supply current i ss v in = set v out +1v, i out = 0ma 75 95 a supply current (standby) i st-by v in = set v out +1v v ce = gnd 0.1 1.0 a short current limit i limit v out = 0v 40 ma ce input voltage high v ceh 1.5 v in v low v cel 0.0 0.3 v output noise en bw = 10hz ~ 100khz 30 vrms ce pull-down resistance r pd 0.7 2.0 8.0 m ? ripple rejection rr ripple 0.5vp ? p v in ? v out = 1.0v, i out = 30ma f=1khz 70 db f=10khz 60 db dropout voltage v d i out =150ma 0.32 0.55 v line regulation in out v v set v out +0.5v v in 6.0v, i out =30ma 0.02 0.10 %/v output voltage temperature coefficient t v out i out = 30ma -40c t opr 85c 100 ppm/ on resistance of nch for auto discharge r low v ce = 0v 60 ?
l1131c preliminary cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-308.c ? electrical characteristics(cont.) l1131c-2.5v parameter symbol test conditions min typ max unit output voltage v out v in = set v out +1v, 1ma i out 30ma 2.45 2.55 v input voltage v in 6.0 v load regulation out out i v v in = set v out +1v, 1ma i out 150ma 22 40 mv output current i out v in ? v out = 1.0v 150 ma supply current i ss v in = set v out +1v, i out = 0ma 75 95 a supply current (standby) i st-by v in = set v out +1v, v ce = gnd 0.1 1.0 a short current limit i limit v out = 0v 40 ma ce input voltage high v ceh 1.5 v in v low v cel 0.0 0.3 v output noise en bw = 10hz ~ 100khz 30 vrms ce pull-down resistance r pd 0.7 2.0 8.0 m ? ripple rejection rr ripple 0.5vp ? p v in ? v out = 1.0v, i out = 30ma f=1khz 70 db f=10khz 60 db dropout voltage v d i out =150ma 0.28 0.50 v line regulation in out v v set v out +0.5v v in 6.0v, i out = 30ma 0.02 0.10 %/v output voltage temperature coefficient t v out i out = 30ma, -40c t opr 85c 100 ppm/ on resistance of nch for auto discharge r low v ce = 0v 60 ?
l1131c preliminary cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-308.c ? test circuit utc l1131c-xx gnd out v out ce 1.0f 1.0f in i ss v in ? typical application circuit 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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