unisonic technologies co., ltd LR1148 cm os 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 ? descripti on t he u t c l r 1148 b e lo nge d to lo w - no ise, lo w - dro p o u t, linea r regul ators op e r ate from 2.3v to 6v input and ar e guar a n teed to deliv er 60 0ma . w i de rang e of pr eset outp u t voltage opti ons ar e avail abl e. built -in lo w o n -resi stanc e transist o r provid es lo w dr opo ut voltag e and lar ge outp u t current. t he u t c lr114 8 is desi g ned an d optimize d for b a tter y -p o w er ed s y stems to w o rk w i th l o w no is e. t h e ut c l r 1 148 cons umes less than 0.01 a in shutdo wn mode. other features i n clu d e ultr a lo w dr opo ut voltag e, current limitin g protect i on, therma l shut do w n prote c tion an d hig h rippl e rejectio n ratio. ? features * 600ma guar antee d output current * 0.01 a s hutd o w n curr ent * ultra lo w dr o pout volta g e * lo w t e mpera t ure coeffici ent * current lim i ti ng protectio n * t hermal shutdo w n pr otectio n * exce lle nt lin e /loa d t r ansient ? or de r i ng i n form at i o n note: pin assignment: i:v in o:v out g:gnd s:en a: adj LR1148l-xx-af5-r (1)pac king type (2)p ackage type (3)output voltage code (1) r : tape reel (2) a f 5: sot- 25 (3) x x : refer to mar k ing infor m ation (4) l: lead free, g: halogen free (4)lead f r ee ? mar k ing i n formati on package volt age code marking sot-25 a d : a d j ordering n u m ber package pi n assi gn me nt packing lead free halogen free 1234 5 LR1148l-xx-af5-r LR1148g-xx-af5-r sot-25 i g s a o tape reel http://
LR1148 cm os ic unisonic technologi es co., ltd 2 of 4 w w w . uniso nic.co m.t w q w - r 50 2- a74 . a ? pin configuration 3 2 1 4 5 en gn d v in v ou t ad j ? p in de sc ri pt io n pin name descript ion v in pow e r inp u t voltag e. suppl y voltag e can ra nge from 2.3v to 6v. b y pass w i t h a 1f cap a citor to gnd. gnd ground en active-lo w s h utdo w n in put. a logic l o w at en reduc es su ppl y curre nt to 0.01a. co nn e c t en to v in for normal oper ation. v out output voltage adj voltag e-ad just input. conn ect adj to gnd for preset output. conn ect an e x ternal resistiv e voltag e-divi der from v out to adj to set the output voltag e b e t w e e n 0.8v a nd 5v. ? block diagram shdn v ref off on 100 mv gnd ad j v ou t en v in + - e rr am p + - current limit thermal sensor
LR1148 cm os ic unisonic technologi es co., ltd 3 of 4 w w w . uniso nic.co m.t w q w - r 50 2- a74 . a ? absolute maxi mu m ra ting (t a = 25 ) paramet er symbol rat i ngs unit supp l y v o ltag e v in 6.5 v po w e r diss i pat ion p d 360 mw junctio n t e mperature t j + 125 ambient oper a t ing t e mperatu r e t opr -40 ~ + 85 storage t e mperature t st g -65 ~ + 150 note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absol u te ma xi mum ratings ar e stress ratings onl y an d functi onal devic e op er atio n is not i m plie d. ? th er mal dat a paramet er symbol rat i ngs unit junction to ambient ja 260 ? c/w junction to case jc 81 ? c/w ? electric al ch ara cteri s tic s (c in = 1f , c ou t = 1f , t a = 2 5 c, unl ess oth e r w ise sp ecifie d)(note 1) paramet er symbol t es t conditions min t yp max unit input volta ge( note 2) v in 2.3 6 v output voltage accuracy (preset mode) v out t a 25 , i ou t = 1 m a ~0 .6 a -2 2 % t a 0~ 85 , i ou t = 1ma~ 0.6a -3 3 % maximum output current i out 600 ma short-circu it current limit i lim i t v out =0 v 1 a ground pi n cu rrent i gnd i out = 0ma 70 a i out = 1ma to 6 00ma 80 a dropo ut voltag e (note3) v d i out = 600ma v out ( nom ) < = 1 .8v 500 120 0 mv 1.8v< v out ( nom ) 200 450 line r egulation (note4) out in out v ? v ? v v in =v out +v d ~6v 0.08 0.55 %/v loa d reg u lati o n (note 4 ,5) ? v out v in =v out +v d , i out = 10ma~ 60 0ma 0.25 1.0 % output voltag e noise en f= 10hz to100k hz, c bp = 0 .1nf 24 v rm s shutdo w n su p p l y curre nt i off en= g nd 0.01 5 a shutdo w n t h reshold v ih 2 v v il 0.4 v t hermal shutd o w n t e mperat ure t s hdn 170 t hermal shutd o w n h y ster esis dt s hdn 20 a dj voltag e v re f measure d on a d j, i ou t = 10ma 0.774 0.8 0.826 v a dj mode t h reshol d 100 mv a djusta ble out put voltag e 0.8 5 v note: 1. spec ifi c ations ar e pr o ductio n tested at t a = 25c. pecifications over the -40 c to 8 5 c op erati ng t e mperat ure rang e are assu red b y des ign, characteriz a tio n and co rr elati on w i th statisti cal qualit y c o n t rols(sqc). 2. t he minimu m operati ng va lue for v in is equal to either [v out ( nom ) +v d ] or 2.3v, w h i ch eve r is greater 3. dropo ut voltage is d e fine d as the voltag e from the inp u t to output w hen o u tput is 2% be lo w the nomin al value. 4. output voltage lin e regu lati on is defin ed a s the change i n out put voltag e from the nominal val ue re sultin g from a chang e in the inp u t lin e volt ag e. output voltag e lo a d regul atio n is defin ed as the chang e in out put voltag e from the nomi nal va lu e as the loa d c u rrent incre a se s from no load to full loa d . 5. regu lation is measured at cons tant junction temperature by using a 20ms current pulse. devices are tested for load regulation in the load range from 10ma to 600ma
LR1148 cm os ic unisonic technologi es co., ltd 4 of 4 w w w . uniso nic.co m.t w q w - r 50 2- a74 . a ? ty pic a l a ppli c a t io n ci rcui t
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