unisonic technologies co., ltd l1803 preliminary linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2015 unisonic technologies co., ltd qw-r102-058.c 1.5a ultra low dropout linear regulator with programmable soft-start ? description the utc l1803 is a typical ldo that features a user-programmable soft-start, very low dropout voltage as low as 0.15v at output current 1.5a, an enable input and a power-good output. the soft-start reduces inrush cu rrent of the load capacitors and minimizes stress on the input power source during start-up. an enable pin to further reduce power dissipation while shutdown. and power-good output indicates the output voltage status. the utc l1803 is stable with any type of output capacitor of 2.2f or more. a precision refer ence and feedback control deliver 2% accuracy over load, line, and operating temperature ranges. ? features * low v in and wide v in range: 1.0v~5.5v * bias voltage (v vcc ) range: 2.7v~5.5v * low v out range: 0.8v~3.3v * 150mv dropout @1.5a, v vcc =5v * 2% output voltage * power-good (pg) output * programmable soft-start prov ides linear voltage startup * stable with any output capacitor 2.2f ? ordering information ordering number package packing L1803G-SH2-R hsop-8 tape reel l1803g-k10-3030-r dfn-10(33) tape reel L1803G-SH2-R (1)packing type (2)package type (1) r: tape reel (2) sh2: hsop-8, k10-3030: dfn-10(33) (3) g: halogen free and lead free (3)green package
l1803 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r102-058.c ? marking hsop-8 dfn-10(33) ? pin configuration ? pin description pin no. hsop-8 dfn-10(33) pin name description 1 1, 2 in the main power input pin. 2 3 pg power-good pin, open-drain output. 3 4 v cc bias input pin of the control circuitry 4 5 en enable pin. 5 6 gnd ground. 6 7 ss soft-start pin. 7 8 fb feedback pin. 8 9 out regulated output pin. - 10 nc no connection.
l1803 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r102-058.c ? block diagram in en v cc pg out ss fb gnd gate driver current limit 0.8v + - - + 0.72v thermal shutdown
l1803 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r102-058.c ? absolute maximum rating parameter symbol ratings unit input voltage range v in , v vcc -0.3~+6 v enable voltage range v en -0.3~+6 v power-good voltage range v pg -0.3~+6 v soft-start voltage range v ss -0.3~+6 v feedback voltage range v fb -0.3~+6 v output voltage range v out -0.3~v in +0.3 v maximum output current i out internally limited junction temperature t j -40~+150 c storage temperature t stg -65~+150 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 operation is not implied. ? recommended operating conditions parameter symbol min typ max unit input voltage (note) v in 1.0 5.5 v bias voltage v vcc 2.7 5.5 v output current i out 0 1.5 a operating ambient temperature t a -40 85 c note: at v in =1v, the maximum load currents may be lower than 1.5a. ? thermal resistance s characteristics parameter symbol ratings unit hsop-8 150 c/w junction to ambient dfn-10(33) ja 72 (note ) c/w note: the pcb area is 4 times larger than that of ic?s ? electrical characteristics at v en =1.1v, v in =v out +0.5v, c vcc =0.1uf, c in =c out =10uf, i out =50ma, v vcc =5.0v, and t a =-40c~+85c, unless otherwise noted. typical values are at t a =+25c. parameter symbol test conditions min typ max unit input voltage range v in v out +v do 5.5 v bias pin voltage range (note 2) v vcc 2.7 5.5 v internal reference (adj.) v ref t a =+25c 0.792 0.8 0.808 v output voltage range v in =5v, i out =1.5a 0.8 3.3 v accuracy (note 2) v out 3v v vcc 5.5v, 50ma i out 1.5a -2 0.5 2 % line regulation ? v out / ? v in / v out v out (nom) +0.5 v in , 5.5v 0.02 %/v load regulation ? v out / v out / ? i out 50ma i out 1.5a 0.08 %/v i out =1.5a, v vcc -v out(nom) 3.25v 150 270 mv dropout voltage (note 3) v do i out =1.5a, v in =v vcc 1.5 1.7 v current limit i cl v out =80%xv out (nom) 2 3 4 a short-circuit current i short v out <0.2v 0.6 1.1 a bias pin current i vcc 1 2 ma shutdown supply current (i gnd ) i shdn v en 0.4v 70 100 a feedback pin current i fb -1 0.1 1 a
l1803 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r102-058.c ? electrical characteristics (cont.) parameter symbol test conditions min typ max unit 1khz, i out =1a, v in =1.8v, v out =1.5v 60 db power-supply rejection (v in ~v out ) psrr 300khz, i out =1a, v in =1.8v, v out =1.5v 30 db 1khz, i out =1a, v in =1.8v, v out =1.5v 50 db power-supply rejection (v vcc ~v out ) 300khz, i out =1a, v in =1.8v, v out =1.5v 30 db startup time t st rload for i out =1.0a, c ss =open 100 s soft-start charging current i ss v ss =0.4v 440 na enable input high level v en , h i 1.1 5.5 v enable input low level v en , l o 0 0.4 v enable pin hysteresis v en , h ys 50 mv enable pin current i en v en =5v 0.1 1 a pg trip threshold v pg , t h v out decreasing 85 90 94 %v out pg trip hysteresis v pg , h ys 7 %v out pg output low voltage v pg , l o i pg =1ma (sinking), v out v pg , t h 0.1 1 a shutdown, temperature increasing +150 c thermal shutdown temperature t sd reset, temperature decreasing +130 c notes: 1. v vcc should be higher or equal to v in in this chip. 2. tested at 0.8v; resistor tole rance is not taken into account. 3. dropout is defined as the voltage from v in to v out when v out is 3% below nominal.
l1803 preliminary linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r102-058.c ? typical application circuit in en vcc pg out ss fb gnd r3 v in c1 v vcc c3 v out r1 c2 r2 c ss utc l1803 table 1. capacitor values for progr amming the soft-start time (note) css soft-start time open 0.1ms 270pf 0.5ms 560pf 1ms 2.7nf 5ms 5.6nf 10ms note: t ss (s) = 0.8 x c ss (f) / (4.4x10 -7 ) 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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