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unisonic technologies co., ltd LR1122B cmos ic www.unisonic.com.tw 1 of 11 copyright ? 2010 unisonic technologies co., ltd qw-r502-320.b low noise 200 ma ldo regulator ? description the utc LR1122B is a typical ldo (linear regulator) with the features of high output voltage ac curacy, low supply current, low on-resistance, and high ripple rejection. during operation of the utc LR1122B , the dropout voltage is very low and the response of line transient and load transient are very well. internally, there?re many functions of utc LR1122B which can be seen in the block figure. there are a voltage reference unit, an error amplifier, resistor-net for voltage setting, a current limit circuit, and a chip enable circuit in each utc LR1122B . the utc LR1122B can be used as an ideal of the power supply for hand-held communication equipment, such as: power source for portable communication equipment, power source for electrical appliances, for example, cameras, vcrs and camcorders and power source for battery-powered equipment. ? features * ultra supply current: 18a (typ.) * standby mode: 0.1a (typ.) * very low dropout voltage: 0.13v (typ.) @ i out =150ma, v out =2.85v * ripple rejection: 75db (typ.) @ f=1khz,v out =2.85v * temperature-drift coeffici ent of output voltage: 30ppm/c (typ.) * well line regulation: 0.02 % / v (typ.) * output voltage accuracy: 0.8 % (typ.) * internal fold back protection circuit: 40ma (typ.) @ short mode * c in =c out =1f or more (ceramic capacitors) are recommended to be used with this ic ? ordering information ordering number package packing LR1122Bg-xx-af5-r sot-25 tape reel note: xx: output voltage, re fer to marking information.
LR1122B cmos ic unisonic technologies co., ltd 2 of 11 www.unisonic.com.tw qw-r502-320.b ? marking package voltage code marking sot-25 16:1.6v 20:2.0v 25:2.5v 2j:2.85v 30:3.0v 33:3.3v 321 5 4 sbxx voltage code l: lead free g: halogen free ? pin configuration ? pin descriptions pin no. pin name description 1 v dd input pin 2 gnd ground pin 3 ce chip enable pin. active when this pin is high. 4 nc no connection 5 v out output pin
LR1122B cmos ic unisonic technologies co., ltd 3 of 11 www.unisonic.com.tw qw-r502-320.b ? block diagram + - current limit reference voltage gnd v out ce v dd
LR1122B cmos ic unisonic technologies co., ltd 4 of 11 www.unisonic.com.tw qw-r502-320.b ? absolute maximum rating parameter symbol ratings unit input voltage v in 6.0 v input voltage(ce pin) v ce 6.0 v output voltage v out -0.3~ v in +0.3 v output current i out 300 ma power dissipation p d 420 mw junction temperature t j +125 operating temperature t opr -40~+85 storage temperature t stg -55~+125 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. ? electrical characteristics (ta=25 , v in =set v out +1v, i out =1ma, c i =c o =1f, unless otherwise specified) LR1122B-1.6v parameter symbol test conditions min typ max unit output voltage v out v in = set v out +1v 1.587 1.613 v input voltage (note) v in 5.0 v load regulation out out i v 1ma i out 150ma 20 40 mv output current i out 200 ma supply current i ss i out =0a 18 25 a supply current (standby) i st-by v ce =0v 0.1 2 a short current limit i limit v out =0v 40 ma ce pull-down current i pd 0.3 a high v ceh 1.5 v ce input voltage low v cel 0.3 v output noise en b w =10hz to 100khz, i out =30ma 30 vrms ripple rejection rr f=1khz, ripple 0.2v p-p v in =set v out +1v, i out =30ma (in case that v out =2.0v, v in =3v) 75 db dropout voltage v d i out =150ma 0.24 0.38 v line regulation in out v v set v out +0.5v v in 5v 0.02 0.10 %/v output voltage temperature coefficient t v out -40 t opr 85 30 ppm/
LR1122B cmos ic unisonic technologies co., ltd 5 of 11 www.unisonic.com.tw qw-r502-320.b ? electrical characteristics(cont.) LR1122B-2.0v parameter symbol test conditions min typ max unit output voltage v out v in = set v out +1v 1.984 2.016 v input voltage (note) v in 5.0 v load regulation out out i v 1ma i out 150ma 20 40 mv output current i out 200 ma supply current i ss i out =0a 18 25 a supply current (standby) i st-by v ce =0v 0.1 2 a short current limit i limit v out =0v 40 ma ce pull-down current i pd 0.3 a high v ceh 1.5 v ce input voltage low v cel 0.3 v output noise en b w =10hz to 100khz, i out =30ma 30 vrms ripple rejection rr f=1khz, ripple 0.2v p-p v in =set v out +1v, i out =30ma (in case that v out =2.0v, v in =3v) 75 db dropout voltage v d i out =150ma 0.17 0.30 v line regulation in out v v set v out +0.5v v in 5v 0.02 0.10 %/v output voltage temperature coefficient t v out -40 t opr 85 30 ppm/ LR1122B-2.5v parameter symbol test conditions min typ max unit output voltage v out v in = set v out +1v 2.484 2.516 v input voltage (note) v in 5.0 v load regulation out out i v 1ma i out 150ma 20 40 mv output current i out 200 ma supply current i ss i out =0a 18 25 a supply current (standby) i st-by v ce =0v 0.1 2 a short current limit i limit v out =0v 40 ma ce pull-down current i pd 0.3 a high v ceh 1.5 v ce input voltage low v cel 0.3 v output noise en b w =10hz to 100khz, i out =30ma 30 vrms ripple rejection rr f=1khz, ripple 0.2v p-p v in =set v out +1v, i out =30ma (in case that v out =2.0v, v in =3v) 75 db dropout voltage v d i out =150ma 0.14 0.25 v line regulation in out v v set v out +0.5v v in 5v 0.02 0.10 %/v output voltage temperature coefficient t v out -40 t opr 85 30 ppm/
LR1122B cmos ic unisonic technologies co., ltd 6 of 11 www.unisonic.com.tw qw-r502-320.b ? electrical characteristics(cont.) LR1122B-2.85v parameter symbol test conditions min typ max unit output voltage v out v in = set v out +1v 2.834 2.866 v input voltage (note) v in 5.0 v load regulation out out i v 1ma i out 150ma 20 40 mv output current i out 200 ma supply current i ss i out =0a 18 25 a supply current (standby) i st-by v ce =0v 0.1 2 a short current limit i limit v out =0v 40 ma ce pull-down current i pd 0.3 a high v ceh 1.5 v ce input voltage low v cel 0.3 v output noise en b w =10hz to 100khz, i out =30ma 30 vrms ripple rejection rr f=1khz, ripple 0.2v p-p v in =set v out +1v, i out =30ma (in case that v out =2.0v, v in =3v) 75 db dropout voltage v d i out =150ma 0.13 0.23 v line regulation in out v v set v out +0.5v v in 5v 0.02 0.10 %/v output voltage temperature coefficient t v out -40 t opr 85 30 ppm/ LR1122B-3.0v parameter symbol test conditions min typ max unit output voltage v out v in = set v out +1v 2.984 3.016 v input voltage (note) v in 5.0 v load regulation out out i v 1ma i out 150ma 20 40 mv output current i out 200 ma supply current i ss i out =0a 18 25 a supply current (standby) i st-by v ce =0v 0.1 2 a short current limit i limit v out =0v 40 ma ce pull-down current i pd 0.3 a high v ceh 1.5 v ce input voltage low v cel 0.3 v output noise en b w =10hz to 100khz, i out =30ma 30 vrms ripple rejection rr f=1khz, ripple 0.2v p-p v in =set v out +1v, i out =30ma (in case that v out =2.0v, v in =3v) 75 db dropout voltage v d i out =150ma 0.13 0.23 v line regulation in out v v set v out +0.5v v in 5v 0.02 0.10 %/v output voltage temperature coefficient t v out -40 t opr 85 30 ppm/
LR1122B cmos ic unisonic technologies co., ltd 7 of 11 www.unisonic.com.tw qw-r502-320.b ? electrical characteristics(cont.) LR1122B-3.3v parameter symbol test conditions min typ max unit output voltage v out v in = set v out +1v 3.284 3.316 v input voltage (note) v in 5.0 v load regulation out out i v 1ma i out 150ma 20 40 mv output current i out 200 ma supply current i ss i out =0a 18 25 a supply current (standby) i st-by v ce =0v 0.1 2 a short current limit i limit v out =0v 40 ma ce pull-down current i pd 0.3 a high v ceh 1.5 v ce input voltage low v cel 0.3 v output noise en b w =10hz to 100khz, i out =30ma 30 vrms ripple rejection rr f=1khz, ripple 0.2v p-p v in =set v out +1v, i out =30ma (in case that v out =2.0v, v in =3v) 75 db dropout voltage v d i out =150ma 0.13 0.23 v line regulation in out v v set v out +0.5v v in 5v 0.02 0.10 %/v output voltage temperature coefficient t v out -40 t opr 85 30 ppm/ note: max. input voltage is 5.5v during 500hours
LR1122B cmos ic unisonic technologies co., ltd 8 of 11 www.unisonic.com.tw qw-r502-320.b ? test circuit utc LR1122B-xx gnd out v out ce 1.0f 1.0f in i ss v dd ? typical application circuit
LR1122B cmos ic unisonic technologies co., ltd 9 of 11 www.unisonic.com.tw qw-r502-320.b ? typical characteristics 100 200 300 400 0 0 0.4 0.8 1.2 1.6 2.0 2.4 output voltage, v out (v) output current, i out (ma) output voltage vs. output current 50 150 250 350 v in =3v v in =4v v in =5v -40 -30 0 40 80 70 90 temperature, t opr ( ) 1.95 1.96 1.97 1.98 1.99 2.00 2.01 2.02 2.03 2.04 2.05 output voltage, v out (v) (v in =3v) output voltage vs. temperature 50 60 10 20 30 -20 -10 0 50 100 150 200 output current, i out (ma) 0 50 100 150 200 250 300 350 400 450 dropout voltage, v d (mv) dropout voltage vs. output current ta=25c 0 20 40 60 80 time, t (s) output voltage, v out (v) 3.0 4.0 input voltage, v in (v) input voltage output voltage input transient response i out =30ma t r = t f = 5s 10mv/div time, t (s) output voltage, v out (v) output voltage output current 50ma 100ma 50 0 100 150 output current, i out (ma) v in =3v load transient response 20mv/div time, t (s) output voltage, v out (v) output voltage output current 10ma 150ma 0 100 200 output current, i out (ma) v in =3v load transient response 50mv/div 100 120 140 160 180 200 0 20 40 60 80 100 120 140 160 180 200 0 20 40 80 100 120 140 160 180 200 60
LR1122B cmos ic unisonic technologies co., ltd 10 of 11 www.unisonic.com.tw qw-r502-320.b ? typical characteristics(cont.) 0 20 40 60 80 100 0 1 2 3 output voltage, v out (v) 0 2 4 ce input voltage, v ce (v) ce input voltage output voltage 6 i out =0ma turn on speed with ce pin time, t(s) 020406080100 time, t (s) 0 1 2 3 output voltage, v out (v) 0 2 4 ce input voltage, v ce (v) ce input voltage output voltage 6 i out =30ma turn on speed with ce pin 0 20 40 60 80 100 time, t (s) 0 1 2 3 output voltage, v out (v) 0 2 4 ce input voltage, v ce (v) ce input voltage output voltage 6 i out =150ma turn on speed with ce pin 0 50 100 150 200 250 300 time, t (s) 0 1 2 output voltage, v out (v) 0 4 2 ce input voltage, v ce (v) i out = 0ma turn off speed with ce pin ce input voltage output voltage 3 0 50 100 150 200 250 300 time, t (s) 0 1 2 output voltage, v out (v) 0 4 2 ce input voltage, v ce (v) i out = 30ma turn off speed with ce pin ce input voltage output voltage 3 0 50 100 150 200 250 300 time, t (s) 0 1 2 output voltage, v out (v) 0 4 2 ce input voltage, v ce (v) i out = 150ma turn off speed with ce pin ce input voltage output voltage 3
LR1122B cmos ic unisonic technologies co., ltd 11 of 11 www.unisonic.com.tw qw-r502-320.b 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 writ ten 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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