unisonic technologies co., ltd L1131A preliminary cmos ic www.unisonic.com.tw 1 of 5 copyright ? 2013 unisonic technologies co., ltd qw-r502-a41.b low noise 150ma ldo regulator ? description the utc L1131A is a coms positive linear regulator. one of it?s feature is the very low quie scent current typical as low as 10 a and its dropout voltage is extremel y low with 150ma output current, and high ripple rejection. each of these ics consists of a voltage reference unit, an error amplifier, resistor-net for voltage setting, a short current limit circuit, a chip enable circuit, and so on. these ics perform with low dropout voltage and the chip-enable function. the supply current at no load of this ic is only 10 a, and the line transient response and t he load transient response of the utc L1131A series are excellent, thus these ics are very suitable for the power supply for hand-held communication equipment. the output voltage of these ics is fixed with high accuracy. since the packages for these ics are sot-23-5 therefore high density mounting of the ics on boards is possible. ? features * low supply current typ. 10 a * standby mode typ. 0.1 a * output voltage range 1.2v~5.0v * excellent line regulation typ. 0.02%/v * built-in fold back protection circuit * ceramic capacitors are recommended to be used with this ic c in =c out =1 f ? ordering information ordering number package packing lead free halogen free L1131Al-xx-af5-r L1131Ag-xx-af5-r sot-25 tape reel note: xx: output voltage, refer to marki ng information.
L1131A preliminary cmos ic unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r502-a41.b ? marking information package voltage code marking sot-25 25: 2.5v 33: 3.3v ? pin configuration ? pin description pin no. pin name description 1 v dd input pin 2 gnd ground pin 3 ce chip enable pin 4 nc no connection 5 v out output pin ? block diagram v dd ce gnd v out current limit v ref + -
L1131A preliminary cmos ic unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r502-a41.b ? 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 160 ma power dissipation p d 360 mw operating temperature range t opt -40~85 c storage temperature range t stg -55~125 c note: absolute maximum ratings are those values be yond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? electrical characteristics parameter symbol test conditions min typ max unit output voltage v out v in = set v out +1v, 1ma i out 30ma v out 3.0v 0.985 1.015 v v out >3.0v 0.980 1.020 output current i out v in -v out =1.0v 150 ma load regulation ? v out / ? i out v in =set v out +1v, 1ma i out 150ma, 1.2v v out <2.0v, 28 55 mv 2.0v v out <3.0v 33 66 mv 3.0v v out 35 80 mv dropout voltage v dif refer to the electrical characteristics by output voltage supply current i ss v in =set v out +1v, i out =0ma 10 18 a supply current (standby) istandby v in =set v out +1v, v ce =v dd 0.1 1.0 a line regulation ? v out / ? v in set v out +0.5v v in 6.0v, i out =30ma 0.02 0.10 %/v ripple rejection rr f=1khz 50 db f=10khz, ripple 0.2vp-p, v in -v out =1.0v, i out =30ma 45 db input voltage v in 1.8 6.0 v output voltage temperature coefficient ? v out / ? t i out =30ma -40c t opt 85c 100 ppm/c short current limit i lim v out =0v 60 ma ce pull-down resistance i pd 0.5 a ce input voltage ?h? v ceh 1.5 6.0 v ce input voltage ?l? v cel 0.0 0.3 v output noise en bw=10hz~100khz 30 vrms on resistance of nch tr. for auto-discharge (only for d version) r low v ce =0v 70 ? ? electrical characteristics by output voltage parameter symbol test conditions min typ max unit dropout voltage v dif i out =150ma v out =1.2v 0.65 v 1.5v L1131A preliminary cmos ic unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r502-a41.b ? test circuit v i out v out c2 v out gnd ce v dd utc L1131A series c1 *c1=ceramic 1.0 f c2=ceramic 1.0 f fig.1 standard test circuit fig.2 supply current test circuit v out gnd ce v dd utc L1131A series i out c2 pulse generator *c2=ceramic 1.0 f fig.3 ripple rejection, line transient
L1131A preliminary cmos ic unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r502-a41.b ? typical application circuit (external components) c2 ceramic 1.0 f ex. murata grm155b30j105ke18b kyocera cm05x5r105k06ab c1 ceramic 1.0 f 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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