unisonic technologies co., ltd lr9102 preliminary cmos ic www.unisonic.com.tw 1 of 4 copyright ? 2013 unisonic technologies co., ltd qw-r502-923.b low noise 300ma ldo regulator ? description the utc lr9102 is a typical ldo (linear regulator) with the features of high output voltage accuracy, low supply current, low on-resistance, and high ripple rejection. during operation of the utc lr9102 , the dropout voltage is very low and the response of li ne transient and load transient are very well. internally, there?re many functions of utc lr9102 which can be seen in the block figure. there are a voltage reference unit, an error amplifier, resistor-net for volt age setting, a current limit circuit, and a chip enable circuit in each utc lr9102 . the utc lr9102 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: 50a (typ.) * standby mode: 0.1a (typ.) * very low dropout voltage: 0.14v (typ.) @i out =300ma, v out =2.85v * ripple rejection: 75db (typ.) @f=1khz,v out =2.85v * temperature-drift coefficient of output voltage: 50ppm/c (typ.) * well line regulation: 0.02%/ v (typ.) * output voltage accuracy: 1.0% (typ.) * internal fold back protection circuit: 50ma (typ.) @ short mode * c in =c out =1f or more (ceramic capacitors) are recommended to be used with this ic ? rdering information ordering number package packing lead free halogen free lr9102l-xx-ae5-r lr9102g-xx-ae5-r sot-23-5 tape reel lr9102l-xx-af5-r lr9102g-xx-af5-r sot-25 tape reel note: xx: output voltage, refer to marki ng information. lr9102l-xx-ae5-r (1)packing type (2)package type (3)output voltage code (1) r: tape reel (2) ae5: sot-23-5, af5: sot-25 (3) xx: refer to marking information (4) l: lead free, g: halogen free (4)halogen free
lr9102 preliminary cmos ic unisonic technologies co., ltd 2 of 4 www.unisonic.com.tw qw-r502-923.b ? marking information package voltage code marking sot-23-5 sot-25 15: 1.8v 25: 2.5v 28 :2.8v 33: 3.3v ? pin configuration ? pin description pin no. pin name description 1 v in 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 ? block diagram + - current limit reference voltage gnd v out ce v in
lr9102 preliminary cmos ic unisonic technologies co., ltd 3 of 4 www.unisonic.com.tw qw-r502-923.b ? absolute maximum rating parameter symbol ratings unit input voltage v in 6 v input voltage (ce pin) v ce 6 v output voltage v out -0.3 ~ v in +0.3 v output current i out 400 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 be yond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? electrical characteristics (t a =25 , v in =set v out +1v, i out =1ma, c i =c o =1f, unless otherwise specified) parameter symbol test conditions min typ max unit output voltage v out v in = set v out +1v v out > 2.0v 0.99 1.01 v v out 2.0v -20 +20 mv input voltage v in 6 v load regulation ? v out 1ma i out 150ma 20 40 mv output current i out 300 ma supply current i ss i out =0a 50 90 a supply current (standby) i st-by v ce =0v 0.1 2 a short current limit i limit v out =0v 50 ma ce pull-down current i pd 0.3 a ce input voltage high v ceh 1.2 v 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 =300ma 1.2v v out <1.5v 0.30 0.50 v 1.5v v out <1.7v 0.22 0.32 1.7v v out <2.0v 0.20 0.28 2.0v v out <2.5v 0.17 0.24 2.5v v out <2.8v 0.14 0.20 2.8v v out 5.0v 0.12 0.19 line regulation in out ? v ? v 1.2v v out 4.0v, v set +0.5v v in 5v 0.02 0.10 %/v 4.0v lr9102 preliminary cmos ic unisonic technologies co., ltd 4 of 4 www.unisonic.com.tw qw-r502-923.b ? test circuit c1 1.0f v in v out gnd ce utc lr9102 c2 1.0f v out v i out basic test circuit test circuit for supply current c1 1.0f v in v out gnd ce utc lr9102 a c2 1.0f i ss ? typical application circuit utc lr9102 gnd out ce v in in c1 1.0f v out c2 1.0f 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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