aic 1084 5a low dropout positive adjustable regulator analog integrations corporation 4f, 9, industry e. 9th rd, science based industrial park, hsinchu taiwan, roc www.analog.com.tw ds-1084- 03 sep 21 , 01 tel: 886-3-5772500 fax: 886-3-5772510 1 n features l dropout voltage 1.3v at 5a output current. l fast transient response. l extremely tight line and load regulation. l current limiting and thermal protection. l adjustable output voltage or fixed 1.5v, 1.8v, 3.3v. l standard 3-pin power packa ges. n applications l mother board i/o power supplies. l microprocessor power supplies. l high current regulator. l post regulator for switching supply. n description the aic108 4 is a low dropout three terminal regulator with 5a output current capability. the output voltage is adjustable with the use of a resistor divider or fixed 3.3v . dropout voltage is guaranteed to be at maximum of 1.4v with the maximum output current. its low dropout voltage and fast transient response make it ideal for low voltage microprocessor applications. current l imit and thermal protection provide protection against any overload condition that would create excessive junction temperatures. n typical application circuit c2 10 m f v out 3.3v v in 5v + + v ref rf2 205 w 1% adj aic108 4 c1 10 m f 2 3 1 rf1 125 w 1% v ref =v out - v adj =1.25v ( typ.) v out =v ref x (1+rf2/rf1)+ i ad j x rf2 i adj =55 m a ( typ.) (1) c1 needed if device is far away from filter capacitors. (2) c2 required for stability. a djustable voltage regulator c2 10 m f v out 3.3v v in 5v + + gnd c1 10 m f aic1 084-33 2 1 3 fixed voltage regulator
aic 1084 2 n ordering information order number pin configuration packaging type e : to-252 m: to-263 t: to-220 m a : to-263 aa front view 1: adj (gnd) 2: vout (tab) 3: vin aic108 4 cm (to-263) 2 3 1 front view 1: adj (gnd) 2: vout (tab) 3: vin aic1 084 c e (to-2 52 ) 2 3 1 front view 1: adj (gnd) 2: vout (tab) 3: vin aic108 4 ct (to-220) 1 2 3 aic108 4- xx cx output voltage default: adj. 15: 1.5v 18: 1.8v 33: 3.3v front view 1: adj (gnd) 2: vout (tab) 3: vin aic108 4 cma (to-263aa) 2 3 1 n absolute maximum ratin g s v in pin to ad j/gnd pin ......................??...............???....................... ? .. ......... 7v operating junction temperature range ..................?????...................... 0 c~ 125 c storage temperature range ...............................??? . ??................. - 65 c ~ 150 c thermal resistance junction to case to-252 ????????????? 15 c/w to-263, to263aa, to-220..... ??? . ... 6 c /w thermal resistance junction to ambient to-252 ?????????? .. ? 100 c/w (assume no ambient airflow, no heatsink) to-263 ?.....??..... ?????... 60 c /w to-263aa ?..??..??..... ??... 60 c /w to-220 ?....??....??????.. 50 c /w lead temperature (soldering) 10 sec. .....................??? .. ?............??.. ?.......260 c
aic 1084 3 n test circuit refer to typical application circuit. n electrical characteristics (v in =5v, t j =25 c, i o =10ma, unless otherwise specified) parameter test conditions min. typ. max. unit reference voltage aic1084 (adj) t j =25 c 1.238 1.25 1.262 v output voltage aic1084-15 v in =5v aic1084-18 v in =5v aic1084-33 v in =5v 1.48 1.78 3.26 1.50 1.80 3.30 1.52 1.82 3.34 v line regulation adj : 2 . 6 5 v v in 7v v out =1.25v fix : v ou t +1.4v v in 7v t j =25 c 0.015 0.2 % load regulation 10ma < i o < 5a t j =25 c 0.6 % dropout voltage d v out , d v ref =1% 10ma i o 5 a 0 c t j 125 c 1.3 1.4 v current limit 0 c t j 125 c 5 6 a adjusted pin current 2 . 6 5 v v in 7 v 55 120 m a adjusted pin current change ( d i adj ) 2. 6 5 v v in 7 v 0 c t j 125 c 0.2 5 m a temperature stability i o =0.5a 0 c t j 125 c 0.5 % minimum load current 0 c t j 125 c 5 10 ma rms output noise (% of v out ) 10hz f 10khz 0.003 % ripple rejection ratio 120hz input ripple c out =25 m f (v in -v out )=3v 60 72 db
aic 1084 4 n block diagram vin 55 m a adj v ref 1.25v - + gm + t hermal limit current amp. vout gnd for fixed voltage device current limit n pin descriptions adj pin - providing v ref =1.25v ( typ.) for adjustable v out . v ref =v out -v adj and i adj =55 m a ( typ.) gnd pin- power ground. vout pin - adjustable output voltage. vin pin - power input. n typical performance characteristics fig. 1 load transient response time ( m s) output voltage (v, ac) load current 0 20 40 60 80 100 0.1a 2.5a -0.4 -0.2 0 0.2 0.4 v in =5.0v c in =1 m f(tantalum) c out =10 m f(tantalum) v out =3.3v fig. 2 line transient response time ( m s) output voltage (mv, ac) input voltage (v) 0 40 80 120 160 200 6.0 7.0 -100 -50 0 50 c in =1 m f (tantalum) c out =10 m f (tantalum) v out =3.3v
aic 1084 5 n typical performance characteristics (continued) fig. 3 dropout voltage (v out =3.3v) output current (a) minimum differential voltage (v) 0 1 2 3 4 5 1.05 1.10 1.15 1.20 1.25 1.30 1.35 fig. 4 minimum operating current differential voltage (v) minimum operating current (ma) 0 1 2 3 4 5 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 fig. 5 minimum operating current minimum operating current ( ma) differential voltage (v) 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 8 fig. 6 aic1084 (a dj. ) short circuit current short circuit current (a) v in -v out (v) 10 1 10 2 10 3 10 4 10 5 10 6 10 7 -80 -70 -60 -50 -40 -30 -20 fig. 7 aic1084 (a dj. ) ripple rejection c out =3.3 m f ripple rejection ratio (db) frequency (hz) c out = 10 m f c out = 25 m f
aic 1084 6 n physical dimensions l to-220 (unit: mm) symbol min max a 3.56 4.82 d 14.23 16.51 e 9.66 10.66 e 2.29 2.79 e1 0.50 1.15 e2 - 1.10 f 0.51 1.39 j1 2.04 2.92 l 12.70 14.73 e d e1 e f 3.81 0.27 a f l j1 e2
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