unisonic technologies co., ltd lr8845 preliminary cmos ic www.unisonic.com.tw 1 of 4 copyright ? 2012 unisonic technologies co., ltd qw-r502-750.a 3 a lo w dropout linear regulator ? description the utc lr8845 belonged to low quiescent current, low dropout linear regulators operated from 2.5v to 6v input and are guaranteed to deliver 3a. wide ra nge of preset output voltage options are available. built-in low on-resistance transistor provides low dropout voltage and large output current. the utc lr8845 is designed and optimized for battery-powered systems to work with low noise. the utc lr8845 consumes less than 2 a in shutdown mode. other features include ultra low dropout voltage, current limiting protection, thermal shutdown prot ection and high ripple rejection ratio. ? features * 3a guaranteed output current * low quiescent current : 300 a (typ.) * 2 a shutdown current * short circuit current fold-back * low temperature coefficient * current limiting protection * thermal shutdown protection * excellent line/load transient * sense option improves load regulation ? ordering information ordering number package pin assignment packing lead free halogen free 1 2 3 lr8845l-xx-aa3-d-r lr8845g-xx-aa3-d-r sot-223 i g o tape reel lr8845l-xx-tn3-d-r lr8845g-xx-tn3-d-r to-252 i g o tape reel lr8845l-xx-tn3-d-t lr8845g-xx-tn3-d-t to-252 i g o tube lr8845l-xx-tq3-d-r lr8845g-xx-tq3-d-r to-263 i g o tape reel LR8845L-XX-TQ3-D-T lr8845g-xx-tq3-d-t to-263 i g o tube note: 1. pin assignment: i: v in o: v out g: gnd 2. xx: output voltage, refer to mark ing information.
lr8845 preliminary cmos ic unisonic technologies co., ltd 2 of 4 www.unisonic.com.tw qw-r502-750.a ? marking information package voltage code marking sot-223 25:2.5v 12 3 lr8845 voltage code date code pin code g: halogen free l: lead free to-252 to-263 ? block diagram
lr8845 preliminary cmos ic unisonic technologies co., ltd 3 of 4 www.unisonic.com.tw qw-r502-750.a ? absolute maximum rating (t a =25 ) parameter symbol ratings unit supply voltage v in 7 v power dissipation p d internally limited mw junction temperature t j +150 operation temperature t opr -40 ~ +85 storage temperature t stg -65 ~ +150 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. ? thermal data parameter symbol ratings unit junction to ambient to-223 ja 165 /w to-252 108 to-263 64 ? electrical characteristics (v in = v out + 1v whichever is greater, c in =0.1f, c out =2.2f (ceramic), t a = 25c, unless otherwise specified) parameter symbol test conditions min typ max unit input voltage v in note1 6 v output voltage accuracy v out t a 25 , i out = 1ma ~3a -2 2 % t a 0~85 , i out = 1ma~3a -3 3 maximum output current i out 3 a short-circuit current limit i limit v out >1.2v 4.5 a short-circuit current i sc v out <0.4v 1.7 a ground pin current i gnd i out = 0ma 300 400 a i out = 1ma to 3a 300 dropout voltage (note 2) v d i out =3a 1.5v<=v out <=1.8v 1000 mv 1.8v lr8845 preliminary cmos ic unisonic technologies co., ltd 4 of 4 www.unisonic.com.tw qw-r502-750.a ? typical application circuit
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