unisonic technologies co., ltd LM5954 preliminary linear integrated circuit www.unisonic.com.tw 1 of 5 copyright ? 2011 unisonic technologies co., ltd qw-r101-035.a high input voltage, low quiescent current, 300ma ldo regulator ? description the utc LM5954 is a low ground current linear regulator which operates with input voltage from 6.5v ~ 25v and delivers output current up to 300ma. typical dropout voltage is only 450mv at 300ma loading. the utc LM5954 has many protection functions including over temperature and current limit which prevent the device from thermal over-load and current over-load. ? features * wide operating voltage : 6.5v~25v * ultra low ground current :120 a * high output accuracy : 2% over temperature * excellent load/line transient * low dropout voltage : 450mv @ 300ma * built-in current limit protection * built-in over tem perature protection * zero shutdown current hsop-8 ? ordering information ordering number lead free halogen free package packing LM5954l-xx-sh2-r LM5954g-xx-sh2-r hsop-8 tape reel LM5954l-xx-sh2-t LM5954g-xx-sh2-t hsop-8 tube note: xx: output voltage, refer to marki ng information. LM5954l-xx-sh2-r (1)packing type (2)package type (3)output voltage code (1) r: tape reel, t: tube (2) sh2: hsop-8 (3) xx: refer to marking information (4) g: halogen free, l: lead free (4)lead free
LM5954 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r101-035.a ? marking information package voltage code marking hsop-8 ad :adj utc date code LM5954 g: halogen free l: lead free voltage code lot code xx ? pin configuration ? pin description pin no. pin name description 1 v out o utput pin 2, 3, 6 nc no connection 4 adj a dj: output feedback pin 5 en on/off pin, low=output on; high=output off 7 gnd ground 8 v in input pin
LM5954 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r101-035.a ? block diagram
LM5954 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r101-035.a ? absolute maximum rating parameter symbol ratings unit supply voltage v cc -0.3~+27 v feedback voltage v fb -1.5~+27 v shutdown voltage v shdn -0.3~+27 v power dissipation p d internally limited w junction temperature t j +125 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. ? thermal data parameter symbol ratings unit junction to ambient ja 50 c/w junction to case jc 20 c/w ? electrical characteristics (unless otherwise specified, thes e specifications apply over v in =v out +2.5v, c in =1f, c out =2.2mf,t a =-40c ~ 85c. typical values refer to t a =25c.) parameter symbol test conditions min typ max unit input voltage v in 6.5 25 v output voltage accuracy v out -2 2 % output voltage range 3 20 v i out =0.1ma 75 120 140 ua quiescent current i q i out =300ma 8 12 22 ma load current range i out 0 300 ma reference voltage v ref -2% 1.235 +2% v line regulation v out v out +2.5v LM5954 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r101-035.a ? 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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