unisonic technologies co., ltd LR3865 advance cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2018 unisonic technologies co., ltd qw-r102-099.c 2a low dropout linear regulator ? description the utc LR3865 belonged to low-dropout, linear regulators operate from 2.5v to 6v input and are guaranteed to deliver 2a. wide range of preset out put voltage options ar e available. built-in low on-resistance transistor provi des low dropout voltage and large output current. the utc LR3865 is designed and optimized for battery-powered sy stems to work with low noise. the utc LR3865 consumes less than 0.5 a in shutdown mode. other features include ultr a low dropout voltage, current limiting protection, t hermal shutdown protection and high ripple rejection ratio. ? features * 2a guaranteed output current * 0.5 a shutdown current * current limiting protection * thermal shutdown protection * excellent line/load transient sop-8 hsop-8 ? ordering information ordering number lead free halogen free package packing LR3865l-xx-s08-x-r LR3865g-xx-s08-x-r sop-8 tape reel LR3865l-xx-sh2-r LR3865g-xx-sh2-r hsop-8 tape reel note: xx: output voltage, refer to marki ng information.
LR3865 advance cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r102-099.c ? marking information package voltage code marking sop-8 hsop-8 15: 1.5v 18: 1.8v 20: 2.0v 25: 2.5v 30: 3.0v 33: 3.3v 50: 5.0v ad: adj ? pin configuration 1 2 3 4 8 7 6 5 hsop-8 gnd set/adj out ss pok en v in nc 1 2 3 4 8 7 6 5 LR3865-a pok en v in ss out set/adj gnd nc sop-8 1 2 3 4 8 7 6 5 LR3865-b en v in out gnd gnd gnd gnd ss
LR3865 advance cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r102-099.c ? pin description pin no. sop-8 a b hsop-8 pin name description 2 1 2 en active-high enable input. a logic low at en reduces supply current to 0.5a. in shutdown, the pok output is low. connect en to v in for normal operation. 3 2 3 v in power input voltage. supply voltage can range from 2.5v to 6v. bypass with a 10f capacitor to gnd. 6 3 6 out output 5 4 5 ss soft start time setting. for adjustable soft start time version, connect a capacitor from ss to gnd to set the soft start time. 8 5, 6, 7, 8 8 gnd ground 1 - 1 pok open-drain power-ok output. pok remains low while the output voltage is below th e pok threshold. connect a 100 kohm pullup resistor from pok to out set voltage-setting input. connect set to gnd for preset output. connect an external resistive voltage-divider from out to set to set the output voltage between 0.6v and 4.5v. the set regulation voltage is 600mv 7 - 7 adj voltage-adjust input. connect an external resistive voltage-divider from out to adj to set the output voltage between 0.6v and 4.5v. the adj regulation voltage is 600mv
LR3865 advance cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r102-099.c ? block diagram set/ adj ss thermal sensor mosfet driver with i lim en logic v ref 0.6v + - + - + - + - 93.75% v ref 100mv + - v in v in en gnd error amplifier out pok
LR3865 advance cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r102-099.c ? absolute maximum rating (t a =25 , unless otherwise specified) parameter symbol ratings unit supply voltage v in 6.5 v power dissipation p d 606 mw junction temperature t j +125 operating temperature t opr -40 ~ +85 storage temperature t stg -65 ~ +150 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. ? thermal resistance s characteristics parameter symbol ratings unit junction to ambient ja 165 ? c/w ? electrical characteristics (t a = 25c, v in = out + 1v or v in =2.5v whichever is greater, c in = 10f+0.1f, c out = 10uf + (0.1uf + 0.1uf), unless otherwise specified) parameter symbol test conditions min typ max unit input voltage v in note1 6 v output voltage accuracy (preset mode) out t a 25 , i out = 1ma ~2a -2 2 % maximum output current i out 3.8 a short-circuit current limit i limit out=0v 3.8 a i q i out =1ma 200 ground pin current i off en=gnd 0.5 5 a dropout voltage (note 2) v d i out =2.0a 650 mv line regulation (note 3) out in out v ? v ? v v in =out+1v~6v 0.08 0.55 %/v load regulation (note 3, 4) ? out v in =out+1v, out=2.5v, i out =10ma~2.0a 0.3 1.0 % power supply rejection ratio psrr f=1khz 45 db v ih 1.8 v shutdown threshold v il 0.5 v thermal shutdown temperature t shdn 165 thermal shutdown hysteresis dt shdn 30 adj voltage v adj measured on set/adj, i out =10ma 0.588 0.6 0.612 v adj mode threshold 100 mv adjustable output voltage 0.8 4.5 v softstart current i ss v ss =0 1.2 ua power-ok threshold v pokth referred to out (nominal) 93.75 % power-ok hysteresis v pokhys 6.25 % power-ok output low voltage v pokl sinking 1ma 0.4 v notes: 1. the minimum operating value for v in is equal to either [out (nom) +v d ] or 2.5v, whichever is greater. 2. dropout voltage is defined as the voltage from the input to output wh en output is 2% below the nominal value. dropout voltage specif ication applies only to output voltage of 2.5v and above . 3. output voltage line regulation is defined as the change in output volt age from the nominal value resulting from a change in the input line voltage. output volt age load regulation is defined as the change in output voltage from the nominal value as the load current increases from no load to full load. 4. regulation is measured at constant junc tion temperature by using a 10ms current pulse.
LR3865 advance cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r102-099.c ? typical application circuit out adj v r1 = r2( - 1) v 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. utc reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof.
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