unisonic technologies co., ltd LR1148 cmos ic www.unisonic.com.tw 1 of 4 copyright ? 2014 unisonic technologies co., ltd qw-r502-a74.a 600m a lo w dropout linear regulator ? description the utc LR1148 belonged to low-noise, low-dropout, linear regulators operate from 2.3v to 6v input and are guaranteed to deliver 600ma. wide range of pr eset output voltage options are available. built-in low on-resistanc e transistor provides low dropout voltage and large output current. the utc LR1148 is designed and optimized for battery-powered systems to work with low noise. the utc LR1148 consumes less than 0.01 a in shutdown mode. other features include ultr a low dropout voltage, current limiting protection, thermal shut down protection and high ripple rejection ratio. ? features * 600ma guaranteed output current * 0.01 a shutdown current * ultra low dropout voltage * low temperature coefficient * current limiting protection * thermal shutdown protection * excellent line/load transient ? ordering information note: pin assignment: i:v in o:v out g:gnd s:en a: adj LR1148l-xx-af5-r (1)packing type (2)package type (3)output voltage code (1) r: tape reel (2) af5: sot-25 (3) xx: refer to marking information (4) l: lead free, g: halogen free (4)lead free ? marking information package voltage code marking sot-25 a d : a d j ordering number package pin assignment packing lead free halogen free 1234 5 LR1148l-xx-af5-r LR1148g-xx-af5-r sot-25 i g s a o tape reel
LR1148 cmos ic unisonic technologies co., ltd 2 of 4 www.unisonic.com.tw qw-r502-a74.a ? pin configuration 3 2 1 4 5 en gnd v in v out adj ? pin description pin name description v in power input voltage. supply voltage can range from 2.3v to 6v. bypass with a 1f capacitor to gnd. gnd ground en active-low shutdown input. a logic low at en reduces supply current to 0.01a. connect en to v in for normal operation. v out output voltage adj voltage-adjust input. connect adj to gnd for preset output. connect an external resistive voltage-divider from v out to adj to set the output voltage between 0.8v and 5v. ? block diagram shdn v ref off on 100mv gnd adj v out en v in + - err amp + - current limit thermal sensor
LR1148 cmos ic unisonic technologies co., ltd 3 of 4 www.unisonic.com.tw qw-r502-a74.a ? absolute maximum rating (t a =25 ) parameter symbol ratings unit supply voltage v in 6.5 v power dissipation p d 360 mw junction temperature t j +125 ambient operating temperature t opr -40 ~ +85 storage temperature t stg -65 ~ +150 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 260 ? c/w junction to case jc 81 ? c/w ? electrical characteristics (c in = 1f, c out =1f, t a = 25c, unless otherwise specified)(note 1) parameter symbol test conditions min typ max unit input voltage(note 2) v in 2.3 6 v output voltage accuracy (preset mode) v out t a 25 , i out = 1ma ~0.6a -2 2 % t a 0~85 , i out = 1ma~0.6a -3 3 % maximum output current i out 600 ma short-circuit current limit i limit v out =0v 1 a ground pin current i gnd i out = 0ma 70 a i out = 1ma to 600ma 80 a dropout voltage (note3) v d i out =600ma v out ( nom ) <=1.8v 500 1200 mv 1.8v LR1148 cmos ic unisonic technologies co., ltd 4 of 4 www.unisonic.com.tw qw-r502-a74.a ? typical application circuit
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