unisonic technologies co., ltd l1152 preliminary cmos ic www.unisonic.com.tw 1 of 5 copyright ? 2011 unisonic technologies co., ltd qw-r502-331.c 500ma, low dropout, low noise ultra-fast with soft start cmos ldo regulator ? description utc l1152 , a 500ma ldo regulator, has very high psrr and super low dropout voltage specially suitable for wireless and portable applications. in the field of hand-held wireless devices, board space and battery life are the main concerns of designers and end-users. because of the low quiescent current and low esr ceramic capacitors, utc l1152 can satisfy those concerns. furthermore, low current consumption in shutdown mode (0.7 a), fast turn-on time ( < 70 s), high output accuracy, current limiting protection, and high ripple rejection ratio are advantages of utc l1152 . ? features * operating voltage ranges : 2.2v to 5.5v * dropout : 250mv at 500ma * when ic shutdown: 5ma discharge current of v out * extreme low noise for dsc application * extreme fast response in line/load transient * internal current limiting protection * internal thermal shutdown protection * high psrr * recommended 1 f output capacitor only for stability * with ttl logic controlled shutdown input ? ordering information ordering number package packing lead free halogen free L1152L-XX-AF5-R l1152g-xx-af5-r sot-25 tape reel note: xx: output voltage, re fer to marking information.
l1152 preliminary cmos ic unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r502-331.c ? marking information package voltage code marking sot-25 33 :3.3v 3 2 1 sxx h g 5 4 voltage code g: halogen free l: lead free ? pin configuration ? pin description pin no pin name description 1 v in supply voltage input. 2 gnd ground. 3 en input logic pin, active high for enabling the chip. when this pin goes to a logic low, the chip will be shutdown. 4 ss soft start pin. 5 v out regulator output voltage pin.
l1152 preliminary cmos ic unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r502-331.c ? block diagram por otp current limit mos driver ss en r v ref v in v out gnd + -
l1152 preliminary cmos ic unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r502-331.c ? absolute maximum rating parameter symbol ratings unit supply input voltage v in 6 v en input voltage v en 6 v power dissipation (t a = 25c) p d 0.4 w junction temperature t j 150 c storage temperature t stg -65~ +150 c note: a bsolute maximum ratings are those values beyond wh ich the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device operation is not implied. ? thermal data parameter symbol ratings unit junction to ambient ja 250 c/w ? operating conditions (note) parameter symbol ratings unit supply input voltage v in 2.2 ~ 5.5 v junction temperature t j -40 ~ +125 c ambient temperature t a -40 ~ +85 c note: the device is not guaranteed to function outside its oper ating conditions. ? electrical characteristics (v in = v out + 0.5v, v en = v in , c in = c out = 1 f (ceramic), t a = 25c, unless otherwise specified.) parameter symbol test conditions min typ max unit input voltage range v in 2.2 5.5 v output voltage accuracy v out i out = 10ma -2 0 +2 % line regulation out in out v v v v in = (v out +0.5v) ~ 5.5v, i out = 1ma 0.01 0.2 %/v load regulation (note 1) out out v v 1ma < i out < 400ma, 2.2v v in < 2.7v 0.6 % 1ma < i out < 500ma, 2.7 v v in 5.5v 1 % quiescent current (note 2) i q v en = 5v, i out = 0ma 25 50 a standby current i stn-by v en = 0v 0.7 1.5 a current limit i limit r load = 0 ? , 2.2 v v in < 2.6v 0.4 0.7 1.05 a r load = 0 ? , 2.7 v v in 5.5v 0.5 0.8 1.05 a dropout voltage (note 3) v d i out = 400ma, 2.2v v in < 2.7v 160 320 mv i out = 500ma, 2.7v v in 5.5v 250 400 mv soft start time v out = 2.5v, c ss = 1nf, c out = 1 f 0.7 1 ms en threshold logic-low v il 0 0.6 v logic-high v ih 1.6 5.5 v enable pin current i en 0.1 1 5 a over temperature shutdown ots 170 c over temperature hysteresis oth 30 c power supply rejection rate psrr i out = 10ma, f = 10khz -55 db output noise voltage en v out = 1.5v, c out = 1 f, i out = 0ma, c ss = 1nf 40 vrms notes: 1. regulation is measured at constant junction te mperature by using a 2ms current pulse. devices are tested for load regulation in the load range from 10ma to 500ma. 2. quiescent, or ground current, is the difference between input and output curr ents. it is defined by i q = i in - i out under no load condition (i out = 0ma). the total current drawn from the supply is the sum of the load current plus the ground pin current. 3. the dropout voltage is defined as v in -v out , which is measured when v out is v out ( normal ) - 100mv.
l1152 preliminary cmos ic unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r502-331.c ? typical application circuit 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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