unisonic technologies co., ltd lr1143 linear integrated circuit www.unisonic.com.tw 1 of 4 copyright ? 2015 unisonic technologies co., ltd qw-r102-056.e high psrr, low dropout, 400ma adjustable ldo regulator ? description the utc lr1143 is a cmos-based 400ma voltage regulator with low supply current, low dropout, adjustable output voltage, the device offering high psrr and low dropout. the quiescent current is as low as 35 a, further prolonging the battery life. the utc lr1143 also works with low-esr ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handheld wireless devices. the utc lr1143 consumes typical 0.7 a in shutdown mode. the other features include low dropout voltage, high output accuracy, current limit protection, and enable/shutdown control. ? features * wide operating voltage range : 3.0v~5.5v * adjustable output voltage * enable/shutdown control * low-noise for rf application * ultra-fast response in line/load transient * current limit protection * output only 1 f capacitor required for stability * high power supply rejection ratio ? ordering information ordering number package packing LR1143G-XX-AF5-R sot-25 tape reel note: xx: output voltage, refer to marki ng information.
lr1143 linear integrated circuit unisonic technologies co., ltd 2 of 4 www.unisonic.com.tw qw-r102-056.e ? marking information package voltage code marking sot-25 ad: adj ? pin configuration ? pin description pin no. pin name description 1 v in voltage input. 2 gnd ground. 3 en chip enable (active high). 4 fb output voltage feedback. 5 v out voltage output. ? block diagram v in gnd en v out fb por otp v ref + - current limit mosfet driver
lr1143 linear integrated circuit unisonic technologies co., ltd 3 of 4 www.unisonic.com.tw qw-r102-056.e ? absolute maximum rating parameter symbol ratings unit supply input voltage v in 6 v en input voltage 6 v power dissipation (t a =25c) p d 0.4 w junction temperature t j 150 c storage temperature t stg -65~+150 c 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 oper ation is not implied. ? recommended operating conditions (note 3) parameter symbol min typ max unit ambient temperature range t a -20 85 c note: the device is not guaranteed to f unction outside its operating conditions. ? thermal data parameter symbol ratings unit junction to ambient ja 260 c/w note: ja is measured in the natural convection at t a =25c on a low effective thermal conductivity test board of jedec 51-3 thermal measurement standard. ? electrical characteristics (v in =3.7v,t a =25c, c in =c out =1 f, i out =20ma, unless otherwise specified) parameter symbol test conditions min typ max unit input voltage range v in 3.0 5.5 v reference voltage v ref 1.188 1.200 1.212 v quiescent current i q i out =0ma 35 50 a shutdown current i shdn v en =0v 0.7 1.5 a current limit i lim 3.0v v in < 5.5v 400 650 ma dropout voltage v drop i out =400ma 800 mv load regulation ? v load 1ma< i out <400ma 3.0v v in <5.5v 1 % line regulation ? v line v in =(v out + 0.5v)~5.5v, i out =1ma 0.01 0.2 %/v logic-low voltage v il 0 0.6 v en threshold logic-high voltage v ih 1.6 5.5 v en pin current i en 0.1 1 a fb pin current i fb 0.1 1 a f=1khz, i out =10ma 67 db power supply rejection ratio psrr f=10khz, i out =10ma 56 db output noise voltage v on v out =1.5v, c out =1 f, i out =0ma 30 v rms
lr1143 linear integrated circuit unisonic technologies co., ltd 4 of 4 www.unisonic.com.tw qw-r102-056.e ? typical application circuit out fb r1 v=v(1+) r2 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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