unisonic technologies co., ltd l1138 preliminary cmos ic www.unisonic.com.tw 1 of 7 copyright ? 2011 unisonic technologies co., ltd qw-r502-323.d high output current cmos voltage regulator with high ripple-rejection and low dropout ? description the utc l1138 is a positive ldo voltage regulator using cmos technology. it is featured as: low dr opout voltage, hi gh output voltage accuracy, and low current consumption. the internal circuits include a low on-resistance transistor to provide a low dropout voltage and large output cu rrent; an overcurrent protector to make sure the load current don?t ex ceed the current capacitance of the output transistor, a thermal shutdown circuit to escape device damage from over-heat, and an on/off circuit to keep the battery life longer. in applications, the utc l1138 can be used in power supply unit for dvd, cd-rom drives, battery-powered devices, personal communication devices, and nbs. sop-8 1 sot-89-5 ? features * output voltage?s high accuracy: 1.0% * low dropout voltage: 120mv typ. @ 3.0v output , i out =300ma * low current consumption: 80 a(typ.)160 a max in operation 0.1 a(typ.)1.0 a max in shutdown mode * high current capability: 800ma output @ v in v out(s) +1.0v * with on/off circuit: ensu res long battery life. * low esr capacitor can be used: at least a 4.7 f ceramic capacitor for the output capacitor. * high ripple rejection 70db typ @ 1.0khz * with over current protector * with thermal shutdown circuit ? ordering information ordering number lead free halogen free package packing L1138L-XX-AB5-R l1138g-xx-ab5-r sot-89-5 tape reel l1138l-xx-s08-r l1138g-xx-s08-r sop-8 tape reel xx: output voltage, refer to marking information.
l1138 preliminary cmos ic unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r502-323.d ? marking information package voltage code marking sot-89-5 sop-8 12 :1.2v 25 :2.5v 28 :2.8v 35 :3.5v u t c l 1 1 3 8 date code voltage code lot code g: halogen free l : lead free ? pin configuration ? pin description for sot-89-5 package pin no. pin name description 1 on/off shutdown pin 2 gnd ground pin 3 nc no connection, nc pin is electrically open and can be connected v in and v ss 4 v in input voltage pin 5 v out output voltage pin for sop-8 package pin no. pin name description 1,2,3 v out output voltage pin (note 1) 4 gnd ground pin 5 on/off shutdown pin 6,7,8 v in input voltage pin (note 2) note: 1.short pins 1, 2 ,3 2.short pins 6, 7, 8
l1138 preliminary cmos ic unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r502-323.d ? block diagram on/off on/off circuit reference voltage circuit + - overcurrent protector thermal shutdown v ss v out v in parasitic diode
l1138 preliminary cmos ic unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r502-323.d ? absolute maximum rating (t a = 25c, unless otherwise specified) parameter symbol ratings unit v in v ss -0.3~v ss +7 v input voltage v on/off v ss -0.3~v in +0.3 v output voltage v out v ss -0.3~v in +0.3 v power dissipation p d internally limited mw operating temperature t opr -40~+85 c storage temperature t stg -40~+125 c 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 (t a = 25c, v in =v out +1v, unless otherwise specified) parameter symbol test conditions min typ max unit input voltage v in 6.5 v output voltage (note 1) v out(e) v in =v out(s) +1.0v,i out =100ma -1% +1% v line regulation out in out1 v v v v out(s) + 0.5v v in 6.5v, i out = 100ma 0.05 0.3 %/v load regulation v out2 v in = v out(s) + 1.0 v, 1.0ma i out 300ma 30 100 mv output current (note 2) i out v in v out(s) +1.0 v 800 ma operation i ss1 v in = v out(s) +1.0 v, on/off pin = on, no load 80 160 a current consumption during shutdown i ss2 v in = v out(s) + 1.0 v, on/off pin = off, no load 0.1 1.0 a short-circuit current i short v in = v out(s) + 1.0 v, on/off pin = on, v out = 0 v 350 ma v out(s) =1.2v 0.8 1.0 v out(s) =2.5v 0.15 0.22 v out(s) =2.8v 0.15 0.22 dropout voltage (note 3) v d i out = 300ma v out(s) =3.5v 0.12 0.18 v temperature coefficient of output voltage t c v o v in = v out(s) +1.0v, i out = 10ma, -40c t a 85c 150 ppm/ c 1.2 v v out(s) 3.0 v 70 power supply rejection psrr v in = v out(s) +1.0 v f = 1.0khz, i out = 100 ma v rip = 0.5v rms 3.1 v v out(s) 5.5 v 65 db high v sh v in = v out(s) +1.0v 1.5 v shutdown pin input voltage low v sl v in = v out(s) + 1.0v 0.3 v high i sh v in = 6.5v, v on/off = 6.5v -0.1 0.1 a shutdown pin input current low i sl v in = 6.5v, v on/off = 0v -0.1 0.1 a detection t sd junction temperature 150 c thermal shutdown temperature release t sr junction temperature 120 c notes: 1. v out(s) : specified output voltage. v out(e) : actual output voltage at the fixed load when fixing( i out = 100ma) and inputting v out(s) + 1.0 v 2. this output current means the one at which the output voltage becomes 98% of v out(e) after gradually increasing the output current. 3. the dropant voltage is detmed as v in - v out , which is measured when v out is v out(normal) 98%
l1138 preliminary cmos ic unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r502-323.d ? operation 1. basic operation the reference voltage (v ref ) and v fb (the output voltage resistance-divided by feedback resistors r s and r f ) are the input for the error amplifier. 2. output transistor a low on-resistance p-channel mosfet is used as the output transistor. inverse current flowing from v out pin through a parasitic diode to v in pin can damage the regulator, so be sure that v out does not exceed v in + 0.3v. 3. shutdown pin (on/off pin) the shutdown pin can start and stop the regulator.the shutdown mode set by this pin can stop the operation of all internal circuits. the struct ure of the on/off pin is shown in fig. 1 . when the on/off pin is not used, connect it to the v ss pin if the logic type is ?a? and to the v in pin if it is ?b?. logic type on/off pin internal circuits v out pin voltage current consumption a ?l?: power on operating set value i ss1 a ?h?: power off stopped v ss level i ss2 b ?l?: power off stopped v ss level i ss2 b ?h?: power on operating set value i ss1
l1138 preliminary cmos ic unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r502-323.d ? test circuits 1. output voltage test 2. current consumption test 3. output current test 4. shutdown pin input voltage / current test 5. power supply rejection test
l1138 preliminary cmos ic unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r502-323.d ? typical application circuit notes: c in is a capacitor for stabilizing the input. a ceramic capacitor of 4.7 f or more can be used for c 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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