unisonic technologies co., ltd lr1142 cmos ic www.unisonic.com.tw 1 of 4 copyright ? 2018 unisonic technologies co., ltd qw-r102-093.b high psrr, low dropout, 500ma adjustable ldo regulator ? description the utc lr1142 is a cmos-based 500ma 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 lr1142 also works with low-esr ceramic capacitors, reducing the amount of board space necessary fo r power applications, critical in handheld wireless devices. the utc lr1142 consumes typical 0.7 a in shutdown mode. the other features include lo w dropout voltage, high output accuracy, current limit protection, and enable/shutdown control. ? features * wide operating voltage range: 2.5v~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 lead free halogen free package packing lr1142l-xx-ae5-a-r lr1142g-xx-ae5-a-r sot-23-5 tape reel lr1142l-xx-ae5-b-r lr1142g-xx-ae5-b-r sot-23-5 tape reel lr1142l-xx-af5-a-r lr1142g-xx-af5-a-r sot-25 tape reel lr1142l-xx-af5-b-r lr1142g-xx-af5-b-r sot-25 tape reel note: xx: output voltage, refer to marki ng information.
lr1142 cmos ic unisonic technologies co., ltd 2 of 4 www.unisonic.com.tw qw-r102-093.b ? marking information package voltage code marking sot-23-5 sot-25 ad: adj ? pin configuration ? pin description pin no. lr1142-a lr1142-b pin name description 1 3 v in voltage input. 2 2 gnd ground. 3 1 en chip enable (active high). 4 5 fb output voltage feedback. 5 4 v out voltage output. ? block diagram
lr1142 cmos ic unisonic technologies co., ltd 3 of 4 www.unisonic.com.tw qw-r102-093.b ? 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 0.36 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 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 280 c/w ? electrical characteristics (v in =v out +1v, 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 2.5 5.5 v reference voltage v ref 0.784 0.8 0.816 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 500 750 ma dropout voltage v drop v out =3.3v, i out =500ma 370 mv load regulation ? v load 1ma lr1142 cmos ic unisonic technologies co., ltd 4 of 4 www.unisonic.com.tw qw-r102-093.b ? typical application circuit v in chip enable gnd fb en v in v out utc lr1142 c in 1f 1 3 r3 10k 5 4 2 c out 1f r1 r2 v out v out =v ref (1+ ) r1 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. utc reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof.
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