unisonic technologies co., ltd lr3966 linear integrated circuit www.unisonic.com.tw 1 of 7 copyright ? 2014 unisonic technologies co., ltd qw - r101 - 032. f 3.0 a low dropout linear regulator ? description the lr3966 is a low - noise, low - dropout linear regulator operate d from a 2.5v to 6v input voltage and is guaranteed to deliver 3a output current . wide range of preset output voltage options are available. built - in low on- resistance transistor provides low dropout voltage and large output current. the lr3966 is designed and optimized for battery - powere d systems to work with low noise . the lr3966 is developed on a cmos process technology which allows low quiescent current operation independent of output load current . this cmos process also allows the lr3966 to operate under extremely low dropout conditions. ? features * 3a guaranteed output current * ultra low dropout voltage * low ground pin current * low temperatur e coefficient * current limiting protection * thermal shutdown protection * excellent line/load transient * sense option improves load regulation to-263 1 sot-223 1 1 to-252-5 to-263-5 1 ? ordering information note: pin assignment: g: gnd i: v in o: v out e: en a: sense/adj (1) t: tube, r: tape reel (2) refer to pin assignment (3) aa3: sot-223, tn5: to-252-5, tq2: to-263, (3) tq5-to-263-5 (4) xx: refer to marking information (5) l: lead free, g: halogen free and lead free lr3966g -xx -aa3 -a -r (1)packing type (2)pin assignment (3)package type (4)output voltage code (5)green package ordering number package pin assignment packing lead free halogen free 1 2 3 4 5 - lr3966g - xx - aa3 - a - r sot - 223 g o i - - tape reel - lr3966g - xx - aa3 - d - r sot - 223 i g o - - tape reel lr3966l - xx - tq2 - a - t lr3966g - xx - tq2 - a - t to - 2 63 g o i - - tube lr3966l - xx - tq2 - a - r lr3966g - xx - tq2 - a - r to - 263 g o i - - tape reel lr3 966l - xx - tq2 - d - t lr3966g - xx - tq2 - d - t to - 2 63 i g o - - tube lr3966l - xx - tq2 - d - r lr3966g - xx - tq2 - d - r to - 2 63 i g o - - tape reel lr3966l - xx - tn5 - t lr3966g - xx - tn5 - t to - 252 - 5 e i g o a tube lr3966l - xx - tn5 - r lr3966g - xx - tn5 - r to - 252 - 5 e i g o a tape reel lr3966l - x x - tq5 - t lr3966g - xx - tq5 - t to - 263 - 5 e i g o a tube lr3966l - xx - tq5 - r lr3966g - xx - tq5 - r to - 263 - 5 e i g o a tape reel
lr3966 linear integrated circuit unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw - r101 - 032. f ? marking information package voltage cod e marking sot -223 18 :1.8v 33 :3.3v ad: adj 1 2 3 lr3966 g xx xxxxxx date code voltage code pin code to -263 1 2 3 utc lr3966 x xxxxxxxxxxx voltage code date code pin code lot code l: lead free g: halogen free to -252-5 to -263-5 1 2 3 utc lr3966 x xx xxxxxxxx voltage code date code lot code l: lead free g: halogen free 4 5 ? p in configuration gnd v out v in to-263 1 2 3 v in gnd v out sot-223 1 2 3 to-252-5/to-263-5 1 2 3 4 5 sense/adj v out gnd v in en ? pin description pin name description en ac tive - low shutdown input. connect en to v in for normal operation. v in power input voltage . supply voltage can range from 2.5v to 6v. bypass with a 68 f capacitor to gnd. gnd ground v out output voltage adj voltage - adjust input . connect an external resist ive voltage - divider from v out to adj to set the output voltage between 1.145v and 5v. sense remote sense pin.
lr3966 linear integrated circuit unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw - r101 - 032. f ? block diagram en v ref thermal sensor current limit off on 1.145v + - err amp gnd adj v out en v in sense
lr3966 linear integrated circuit unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw - r101 - 032. f ? absolute maximum rating (t a =25 ) parameter symbol ratings unit input supply voltage (survival) v in 0~7.0 v enable input voltage(survival) v en 0~7.0 v power dissipation p d 9 25 mw operation junction temperature t opr - 40 ~ + 125 storage temperature t stg - 65 ~ +150 note: absolu te maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device operation is not implied. ? electrical characteristics unless otherwise specified: v in =v o(nom ) +1v or v in =2.5v whichever is greater, i l =10ma, c in =68 f, c out =33 f, v en =v in - 0.3v , tj=25 c. parameter symbol test condition min typ max units output voltage tolerance v o ut 10ma lr3966 linear integrated circuit unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw - r101 - 032. f ? typical application circuit lr3966 v in v out c out 33f v in c in 68f gnd adj v out en r1 r2 on off + + v out =v ref (1+r 2 /r 1 ) lr3966 v in v out c out 33f v in c in 68uf gnd sense v out en l o a d on off + + * lr3966 can deliver a continuous current of 3.0a over the full operating temperature. however, the output current is limited by the restriction of power dissipation which differs from packages. a heat sink may be required depending on the maximum power dissipation and maximum ambient temperature of application. with respect to the applied package, the maximum output current of 3.0a may be still undeliverable. * when a pull - up resistor is connected between v e n terminal and v en signal (or v in line), the resistance of the pull - up resistor should be kept under 10k ? .
lr3966 linear integrated circuit unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw - r101 - 032. f ? typical characteristics (v in = v out + 1v or v in =2.25v whichever is greater , c in = 68 f , c out = 33 f t a = 25c, unless otherwise specified) 0 400 800 1200 1600 2000 2400 2800 3200 0 60 120 180 240 300 360 420 480 drop-out (mv) output current, i out (ma) drop-out voltage vs. load current ground pin current vs. input voltage ground pin current, i gnd (a) input voltage, v in (v) v out v in load transient i l power on v in v out -40 -20 0 20 40 60 80 100 120 140 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 vout (v) temp () temperature vs. output voltage c hange 2 3 4 5 6 50 100 150 200 250 v out =3.3v v out =1.8v v out =3.3v v out =3.3v
lr3966 linear integrated circuit unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw - r101 - 032. f 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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