unisonic technologies co., ltd lr3966 preliminary linear integrated circuit www.unisonic.com.tw 1 of 9 copyright ? 2010 unisonic technologies co., ltd qw-r101-032.b 3.0a low dropout linear regulator ? description the lr3966 is a low-noise, low-dropout linear regulator operated from a 2.5v to 6v input voltage and is guaranteed to deliver 3a output current. 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 lr3966 is designed and optimized for battery-powered 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 temperature coefficient * current limiting protection * thermal shutdown protection * excellent line/load transient * sense option improves load regulation ? ordering information ordering number lead free halogen free package packing LR3966L-XX-TN5-D-R lr3966g-xx-tn5-d-r to-252-5 tape reel
lr3966 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 9 www.unisonic.com.tw qw-r101-032.b ? marking information package voltage code marking to-252-5 3 3 : 3 . 3 v ? pin configuration 1 2 3 4 5 sence/adj v out gnd v in en ? pin description pin no. pin name description 1 en active-low shutdown input. connect en to v in for normal operation. 2 v in power input voltage. supply voltage can range from 2.5v to 6v. bypass with a 68f capacitor to gnd. 3 gnd ground 4 v out output voltage adj voltage-adjust input. connect adj to g nd for preset output. connect an external resistive voltage-divider from v out to adj to set the output voltage between 1.145v and 5v. 5 sense remote sense pin.
lr3966 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 9 www.unisonic.com.tw qw-r101-032.b ? block diagram
lr3966 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 9 www.unisonic.com.tw qw-r101-032.b ? 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 925 mw operation junction temperature range t opr -40 ~ +125 storage temperature range 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. ? electrical characteristics unless otherwise specified: v in =v o(nom) +1v or v in =2.5v whichever is greater, i l =10ma, c in =68f, c out =33f, v en =v in -0.3v . limits in standard typeface are for t j =25 , and limits in boldface type apply over the full operating temperature range. parameter symbol test condition min typ max units -2 2 output voltage tolerance v out 10ma lr3966 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 9 www.unisonic.com.tw qw-r101-032.b ? typical application circuit * lr3966 can deliver a continuous current of 3.0a over the full operat ing 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 maxi mum power dissipation and maximum ambient temperature of application. with respect to t he applied package, the maxi mum output current of 3.0a may be still undeliverable. *when a pull-up resistor is connected between v en terminal and v en signal (or v in line), the resistance of the pull-up resistor should be kept under 10k ? . 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.
|
