unisonic technologies co., ltd l1127 preliminary cmos ic www.unisonic.com.tw 1 of 5 copyright ? 2012 unisonic technologies co., ltd qw-r502-742.a ultr a -lo w -noise, high-speed, low-dropout, 300ma linear regulator ? description as a low dropout linear regulator, the utc l1127 only needs low input voltage (2.5~6v), and can deliver current to 300ma for setting the output voltage. the utc l1127 is ideal for being used in such battery-powered equipments notebook, personal computer and mother board. its typical dropout voltage is 200mv at loading current 300ma. l1127 has 1.0v, 1.2v, 1.5v, 1.8v, 2.5v , 3.0v, 3.3v, 4.2v, 4.75v, 5.2v fixed voltage versions and 0.8v to 5.5v adjustable voltage versions. to protect itself against current ove r-loads and over temperature, the l1127 has short current limit and thermal shutdown functions. ? features * operating voltage: 2.5v~6v * low voltage dropout * output current guaranteed 300ma * for setting output voltage two modes - fixed mode : 1.0v,1.2v,1.5v,1.8v, 2.5v,3.0v,3.3v,4.2v,4.75v,5.2v - adj mode: adjustable output voltage 0.8v~5.5v * internal current limit protection * with soft-start * internal thermal protection * work stably with low esr ceramics capacitor ? ordering information ordering number package packing lead free halogen free L1127L-XX-AF5-R l1127g-xx-af5-r sot-25 tape reel note: xx: output voltage, re fer to marking information. L1127L-XX-AF5-R (1)packing type (2)package type (3)output voltage code (1) r: tape reel (2) af5: sot-25 (3) xx: refer to marking information (4) g: halogen free, l: lead free (4)lead free
l1127 preliminary cmos ic unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r502-742.a ? marking information package voltage code marking sot-25 45: 4.5v ? pin configuration 3 2 1 4 5 nc/adj gnd v out v in shdn ? pin description no. pin name i/o description 1 v in i voltage supply 2 gnd ground 3 shdn i control pin for shutdown; logic high: enable ;logic low: shutdown 4 nc. adj this pin is connected to an external resistor divider, turns to adjustable output voltage mode operation. 5 v out o output pin
l1127 preliminary cmos ic unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r502-742.a ? block diagram for fixed output voltage mode: for adjustable output voltage mode:
l1127 preliminary cmos ic unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r502-742.a ? absolute maximum rating parameter symbol ratings unit v in supply voltage (v in to gnd) v in +6.5 v shdn input voltage ( shdn to gnd) shdn v -0.3 ~ +6.5 v power dissipation p d 400 mw junction temperature t j +125 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 operation is not implied. ? recommended operating conditions parameter symbol ratings unit v in supply voltage v in 2.5 ~ 6 v output voltage v out 0.8 ~ 5.5 v v out output current i out 0 ~ 300 ma operating temperature t opr -40 ~ +85 ? electrical characteristics (v in = v out +0.5v (min v in =2.5v), i out =0~300ma, c in = 1 f, c out =1 f, t a = 25 , unless otherwise specified) parameter symbol test conditions min typ max unit output voltage v in = v out +0.5v, 1ma< i out < 300ma 98%x v out 102%x v out v input voltage v in 2.5 6 v line regulation reg line v out +0.5v< v in < 6v,i out = 10ma 0.06 %/v load regulation reg load v in = v out +0.5v, 1ma< i out < 300ma 0.6 %/a reference voltage v ref v in = v out +0.5v, 1ma< i out < 300ma 0.784 0.8 0.816 v maximum output current i out ( max ) v in =v out +0.5v, v out = 0.98xv out 300 400 ma quiescent current i q i out =10ma ~300ma 60 90 a dropout voltage v d v out = 1.0v, i out = 300ma 1400 1500 mv v out = 1.2v, i out = 300ma 1200 1300 v out = 1.5v, i out = 300ma 900 1000 v out = 1.8v, i out = 300ma 600 700 v out =2.5v,2.8v,3.3v,4.2v, i out = 300ma 170 300 v out =4.75v and 5.2v, i out =300ma 140 300 power supply ripple rejection ratio psrr f = 10khz, i out = 300ma 45 db short current limit i short v out = 0v 50 ma shutdown threshold v ih 1.5 6 v v il 0 0.4 v shutdown supply current i off shdn = low, v in = v out +0.5v 0.1 1 a soft start time t ss 50 s rms output noise v noise t a =25 , 10hz f 100khz, v out = 0.8v 60 v rms v out discharge mosfet r ds(on) shdn = low 60 ? shdn pull down resistance 3 m ? output voltage temperature coefficient t j = -40 ~85 + 100 ppm/ thermal shutdown temperature t shdn 165 thermal shutdown hysteresis dt shdn 30
l1127 preliminary cmos ic unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r502-742.a ? typical application circuits for fixed output voltage mode: s for adjustable output voltage mode: ) r2 r1 + (1 0.8 = v out 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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