unisonic technologies co., ltd lr1121b cmos ic www.unisonic.com.tw 1 of 7 copyright ? 2011 unisonic technologies co., ltd qw-r502-101.e high ripple-rejection ldo regulator ? description the utc lr1121b is cmos-based voltage regulator ics with high output voltage accuracy, extremely low current, low on-resistance, and high ripple rejection. an on/off circuit enables the out put to be turned off, ensuring a long battery life. a built-in low on-re sistance transistor provides a low dropout voltage and large output cu rrent, and a built-in overcurrent protector prevents the load curr ent from exceeding the current capacitance of the out put transistor. the line transient response and load transient of the utc lr1121b is excellent. sot-25 4 5 3 2 1 ? features * ultra-low supply current : during operation: 30 a typ. during standby: 0.1 a typ. * output voltage: 2.1v ~ 5.5v , selectable in 0.1 v steps. * high output voltage accuracy: 2.0% * low dropout voltage: 180 mv typ. (2.8 v output product, i out = 100 ma) * high ripple rejection: 70 db typ. (@ 1.0 khz) * low temperature-drift coefficient of output voltage: 100ppm/c typ. * high peak current capability: 150 ma output is possible (@ v in v out(s) + 1.0 v) ? ordering information ordering number package packing lead free halogen free LR1121BL-XX-AF5-A-R lr1121bg-xx-af5-a-r sot-25 tape reel lr1121bl-xx-af5-b-r lr1121bg-xx-af5-b-r sot-25 tape reel
lr1121b cmos ic unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r502-101.e ? marking information package voltage code marking sot-25 21:2.1v 22:2.2v 23:2.3v 24:2.4v 25:2.5v 26:2.6v 27:2.7v 28:2.8v 2j:2.85v 29:2.9v 30:3.0v 31:3.1v 32:3.2v 33:3.3v 34:3.4v 35:3.5v 36:3.6v 37:3.7v 38:3.8v 39:3.9v 40:4.0v 41:4.1v 42:4.2v 43:4.3v 44:4.4v 45:4.5v 46:4.6v 47:4.7v 48:4.8v 49:4.9v 50:5.0v 51:5.1v 52:5.2v 53:5.3v 54:5.4v 55:5.5v 5 4 3 pin code voltage code 2 1 k l: lead free g: halogen free ? pin description pin no. symbol description a b 5 1 v out output pin 2 2 v ss gnd pin 1 3 v in input pin 3 4 on/off chip enable pin 4 5 nc* no connection (the nc pin is electrically open or connected to v in or v ss .) ? block diagram
lr1121b cmos ic unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r502-101.e ? absolute maximum ratings (t a =25c) parameter symbol ratings unit input voltage v in 7 v v on/off 0.3 ~ v in +0.3 v output voltage v out -0.3 ~ v in +0.3 v power dissipation p d 280 mw junction temperature t j 125 c 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, unless otherwise specified.) parameter symbol test circuit test conditions min typ max unit output voltage v out 1 v in =v out +1.0v, i out =30ma v out 0.98 v out 1.02 v output current i out 3 v in v R out +1.0v 200 ma input voltage v in 2.0 7 v line regulation v out(line) v in v out 1 v out +0.5v v in 7v i out =30ma 0.04 0.2 %/v load regulation v out(load) 1 v in =v out +1.0v 1.0ma i out 80ma 15 40 mv output voltage temperature coefficient v out ta v out 1 v in =v out +1.0v, i out =30ma -40c ta 85c 100 ppm/c supply current i ss1 2 v in =v out +1.0v, on/off pin=on, no load 30 65 a supply current during standby i ss2 2 v in =v out +1.0v, on/off pin=off, no load 0.1 1.0 short circuit current i short 3 v in =v out +1.0v, on/off pin=on, v out =0v 230 ma shutdown pin input voltage high v sh 4 v in =v out +1.0v, r l =10k ? 1.6 v in v low v sl 4 v in =v out +1.0v, r l =10k ? 0 0.3 shutdown pin input current high i sh 4 v in =7v, v on/off = v in -0.1 0.1 a low i sl 4 v in =7v, v on/off = v ss -0.1 0.1 ripple rejection rr 5 v in =v out +1.0v, f=1.0khz ripple 0.5vp-p 70 db ? electrical characteristics of dropout voltage (t a =25c) output voltage v out (v) v d (dropout voltage) condition min typ max unit 2.1v v out ( s ) 2.4v i out =100ma 0.22 0.70 v 2.5v v out ( s ) 2.7v 0.20 0.35 v 2.8v v out ( s ) 3.3v 0.18 0.30 v 3.4v v out ( s ) 5.5v 0.15 0.26 v
lr1121b cmos ic unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r502-101.e ? test circuit note: input capacitor (c in ): 1.0 f or more output capacitor (c l ): 2.2 f or more (tantalum capacitor) ? selection of output capacitor (c l ) in this ic, phase compensation and the output capacitor is made for securing stable operation even if the load current is varied. therefore, always place a capacitor (c l ) of 2.2 f or more between v out and v ss pins. using a capacitor whose esr is outside the optimum range (approximately 0.5 ~ 5 ? ), whether larger or smaller, may cause an unstable output, resulting in oscillation. for this r eason, a tantalum electrolytic capacitor is recommended.
lr1121b cmos ic unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r502-101.e ? typical characteristics (1) output voltage vs. input voltage v out (v) v out (v) (2) output voltage vs. output current (3) output voltage vs. ambient temperature
lr1121b cmos ic unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r502-101.e ? typical characteristics (cont.) (4) dropout voltage vs. output current (5) ripple rejection (6) load transient response characteristics v out (v) v out (v) i out (ma) i out (ma)
lr1121b cmos ic unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r502-101.e ? typical characteristics (cont.) (7) current consumptio n vs. input voltage iss 1 ( a) v in (v) 2 25 45 4 30 35 40 0 68 20 15 10 5 0 lr1121b-5.0v 85 c 25 c -40 c (8) input transient response characteristics 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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