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unisonic technologies co., ltd ld2985 linear integrated circuit www.unisonic.com.tw 1 of 23 copyright ? 2010 unisonic technologies co., ltd qw-r102-024.g very low drop and low noise voltage regulator low esr cap. compatible, with inhibit function ? description the utc ld2985 is a 150ma fixed output voltage regulator. the ultra low drop voltage and the lo w quiescent current make them particularly suitable for low noise, low power applications, and in battery powered systems. in sleep mode quiescent current is less than 1 a when inhibit pin is pulled low. shutdown logic control function is available on pin 3 (ttl compatible). this means that when the device is used as local regulator, it is possi ble to put a part of the board in standby, decreasing the total power consumption. an external capacitor, c byp =10nf, connected between bypass pin and gnd reduce the noise to 30 vrms. typical applications are in cellular phone, palmtop laptop computer, personal digital assistant (pda), personal stereo, camcorder and camera. ? features * very low dropout voltage (280mv at 150ma and 7mv at 1ma load) * very low quiescent current (2ma typ. at 150ma load and 80 a at no load) * output current up to 150ma * logic controlled electronic shutdown * output voltage of 1.5, 1.8, 2.5, 2.8, 2.85, 3, 3.1, 3.2, 3.3, 3.5, 3.6, 3.8, 4, 4.7, 5v * internal current and thermal limit * low output noise voltage 30 vrms ? ordering information ordering number lead free plating halogen free package packing ld2985l-xx-af5-r ld2985g-xx-af5-r sot-25 tape reel note: xx: output voltage, re fer to marking information.
ld2985 linear integrated circuit unisonic technologies co., ltd 2 of 23 www.unisonic.com.tw qw-r102-024.g ? marking information part no. voltage voltage code marking ld2985-1.5v 1.5v a5 ld2985-1.8v 1.8v a8 ld2985-2.5v 2.5v b5 ld2985-2.8v 2.8v b8 ld2985-2.85v 2.85v bj ld2985-3.0v 3.0v c0 ld2985-3.1v 3.1v c1 ld2985-3.2v 3.2v c2 ld2985-3.3v 3.3v c3 ld2985-3.5v 3.5v c5 ld2985-3.6v 3.6v c6 ld2985-3.8v 3.8v c8 ld2985-4.0v 4.0v d0 ld2985-4.7v 4.7v d7 ld2985-5.0v 5.0v e0 ? pin configuration ? pin description pin no. pin name description 1 in input port 2 gnd ground pin 3 inhibit control switches on/off. inhibit is not inte rnally pulled-up; it cannot be left floating. disable the device when connected to gn d or to a positive voltage less than 0.18v 4 bypass bypass pin: capacitor to be connected to g nd in order to improve the thermal noise performances. 5 out output port
ld2985 linear integrated circuit unisonic technologies co., ltd 3 of 23 www.unisonic.com.tw qw-r102-024.g ? block diagram
ld2985 linear integrated circuit unisonic technologies co., ltd 4 of 23 www.unisonic.com.tw qw-r102-024.g ? absolute maximum ratings parameter symbol ratings unit dc input voltage v in 16 v inhibit input voltage v inh 16 v output current i out internally limited power dissipation p d internally limited operating junction temperature t opr -20 ~ +125 c storage temperature t stg -40 ~ +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 oper ation is not implied. ? thermal data parameter symbol ratings unit junction to case jc 81 c/w ? electrical characteristics (t j =25c, v i n =v out +1v, i out =1ma, v shdn =2v, c i =1 f, c o =1 f, unless otherwise specified) for v out =1.5v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =2.5v 1.470 1.5 1.530 v output voltage v out i out =1 ~ 150ma 1.455 1.545 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv t j =-20 ~ 125c, i out =0 5 mv i out =1ma 7 10 mv i out =1ma, t j =-20 ~ 125c 15 mv i out =10ma 40 60 mv i out =10ma, t j =-20 ~ 125c 90 mv i out =50ma 120 150 mv i out =50ma, t j =-20 ~ 125c 225 mv i out =150ma 280 350 mv dropout voltage v d i out =150ma, t j =-20 ~ 125c 575 mv i out =0 80 100 a t j =-20 ~ 125c, i out =0 150 a i out =1ma 100 150 a i out =1ma, t j =-20 ~ 125c 200 a i out =10ma 200 300 a i out =10ma, t j =-20 ~ 125c 400 a i out =50ma 600 1050 a i out =50ma, t j =-20 ~ 125c 1200 a i out =150ma 2000 3000 a i out =150ma, t j =-20 ~ 125c 4000 a off mode v inh < 0.18v 0 a quiescent current i q off mode v inh < 0.18v t j =-20 ~ 125c 2 a supply voltage rejection svr c byp =0.01 f, c o =10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, c o =10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 5 of 23 www.unisonic.com.tw qw-r102-024.g ? electrical characteristics(cont.) for v out =1.8v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =2.8v 1.764 1.8 1.836 v output voltage v out i out =1 ~ 150ma 1.746 1.854 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv t j =-20 ~ 125c, i out =0 5 mv i out =1ma 7 10 mv i out =1ma, t j =-20 ~ 125c 15 mv i out =10ma 40 60 mv i out =10ma, t j =-20 ~ 125c 90 mv i out =50ma 120 150 mv i out =50ma, t j =-20 ~ 125c 225 mv i out =150ma 280 350 mv dropout voltage v d i out =150ma, t j =-20 ~ 125c 575 mv i out =0 80 100 a t j =-20 ~ 125c, i out =0 150 a i out =1ma 100 150 a i out =1ma, t j =-20 ~ 125c 200 a i out =10ma 200 300 a i out =10ma, t j =-20 ~ 125c 400 a i out =50ma 600 1050 a i out =50ma, t j =-20 ~ 125c 1200 a i out =150ma 2000 3000 a i out =150ma, t j =-20 ~ 125c 4000 a off mode v inh < 0.18v 0 a quiescent current i q off mode v inh < 0.18v t j =-20 ~ 125c 2 a supply voltage rejection svr c byp =0.01 f, co=10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, co=10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 6 of 23 www.unisonic.com.tw qw-r102-024.g ? electrical characteristics(cont.) for v out =2.5v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =3.5v 2.450 2.5 2.550 v output voltage v out i out =1 ~ 150ma 2.425 2.575 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv t j =-20 ~ 125c, i out =0 5 mv i out =1ma 7 10 mv i out =1ma, t j =-20 ~ 125c 15 mv i out =10ma 40 60 mv i out =10ma, t j =-20 ~ 125c 90 mv i out =50ma 120 150 mv i out =50ma, t j =-20 ~ 125c 225 mv i out =150ma 280 350 mv dropout voltage v d i out =150ma, t j =-20 ~ 125c 575 mv i out =0 80 100 a t j =-20 ~ 125c, i out =0 150 a i out =1ma 100 150 a i out =1ma, t j =-20 ~ 125c 200 a i out =10ma 200 300 a i out =10ma, t j =-20 ~ 125c 400 a i out =50ma 600 1050 a i out =50ma, t j =-20 ~ 125c 1200 a i out =150ma 2000 3000 a i out =150ma, t j =-20 ~ 125c 4000 a off mode v inh < 0.18v 0 a quiescent current i q off mode v inh < 0.18v t j =-20 ~ 125c 2 a supply voltage rejection svr c byp =0.01 f, co=10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, co=10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 7 of 23 www.unisonic.com.tw qw-r102-024.g ? electrical characteristics(cont.) for v out =2.8v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =3.8v 2.744 2.8 2.856 v output voltage v out i out =1 ~ 150ma 2.716 2.884 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv t j =-20 ~ 125c, i out =0 5 mv i out =1ma 7 10 mv i out =1ma, t j =-20 ~ 125c 15 mv i out =10ma 40 60 mv i out =10ma, t j =-20 ~ 125c 90 mv i out =50ma 120 150 mv i out =50ma, t j =-20 ~ 125c 225 mv i out =150ma 280 350 mv dropout voltage v d i out =150ma, t j =-20 ~ 125c 575 mv i out =0 80 100 a t j =-20 ~ 125c, i out =0 150 a i out =1ma 100 150 a i out =1ma, t j =-20 ~ 125c 200 a i out =10ma 200 300 a i out =10ma, t j =-20 ~ 125c 400 a i out =50ma 600 1050 a i out =50ma, t j =-20 ~ 125c 1200 a i out =150ma 2000 3000 a i out =150ma, t j =-20 ~ 125c 4000 a off mode v inh < 0.18v 0 a quiescent current i q off mode v inh < 0.18v t j =-20 ~ 125c 2 a supply voltage rejection svr c byp =0.01 f, co=10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, co=10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 8 of 23 www.unisonic.com.tw qw-r102-024.g ? electrical characteristics(cont.) for v out =2.85v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =3.85v 2.793 2.85 2.907 v output voltage v out i out =1 ~ 150ma 2.764 2.936 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv t j =-20 ~ 125c, i out =0 5 mv i out =1ma 7 10 mv i out =1ma, t j =-20 ~ 125c 15 mv i out =10ma 40 60 mv i out =10ma, t j =-20 ~ 125c 90 mv i out =50ma 120 150 mv i out =50ma, t j =-20 ~ 125c 225 mv i out =150ma 280 350 mv dropout voltage v d i out =150ma, t j =-20 ~ 125c 575 mv i out =0 80 100 a t j =-20 ~ 125c, i out =0 150 a i out =1ma 100 150 a i out =1ma, t j =-20 ~ 125c 200 a i out =10ma 200 300 a i out =10ma, t j =-20 ~ 125c 400 a i out =50ma 600 1050 a i out =50ma, t j =-20 ~ 125c 1200 a i out =150ma 2000 3000 a i out =150ma, t j =-20 ~ 125c 4000 a off mode v inh < 0.18v 0 a quiescent current i q off mode v inh < 0.18v t j =-20 ~ 125c 2 a supply voltage rejection svr c byp =0.01 f, c o =10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, c o =10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 9 of 23 www.unisonic.com.tw qw-r102-024.g ? electrical characteristics(cont.) for v out =3.0v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =4.0v 2.940 3.0 3.060 v output voltage v out i out =1 ~ 150ma 2.910 3.090 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv t j =-20 ~ 125c, i out =0 5 mv i out =1ma 7 10 mv i out =1ma, t j =-20 ~ 125c 15 mv i out =10ma 40 60 mv i out =10ma, t j =-20 ~ 125c 90 mv i out =50ma 120 150 mv i out =50ma, t j =-20 ~ 125c 225 mv i out =150ma 280 350 mv dropout voltage v d i out =150ma, t j =-20 ~ 125c 575 mv i out =0 80 100 a t j =-20 ~ 125c, i out =0 150 a i out =1ma 100 150 a i out =1ma, t j =-20 ~ 125c 200 a i out =10ma 200 300 a i out =10ma, t j =-20 ~ 125c 400 a i out =50ma 600 1050 a i out =50ma, t j =-20 ~ 125c 1200 a i out =150ma 2000 3000 a i out =150ma, t j =-20 ~ 125c 4000 a off mode v inh < 0.18v 0 a quiescent current i q off mode v inh < 0.18v t j =-20 ~ 125c 2 a supply voltage rejection svr c byp =0.01 f, c o =10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, c o =10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 10 of 23 www.unisonic.com.tw qw-r102-024.g ? electrical characteristics(cont.) for v out =3.1v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =4.1v 3.038 3.1 3.162 v output voltage v out i out =1 ~ 150ma 3.007 3.193 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv t j =-20 ~ 125c, i out =0 5 mv i out =1ma 7 10 mv i out =1ma, t j =-20 ~ 125c 15 mv i out =10ma 40 60 mv i out =10ma, t j =-20 ~ 125c 90 mv i out =50ma 120 150 mv i out =50ma, t j =-20 ~ 125c 225 mv i out =150ma 280 350 mv dropout voltage v d i out =150ma, t j =-20 ~ 125c 575 mv i out =0 80 100 a t j =-20 ~ 125c, i out =0 150 a i out =1ma 100 150 a i out =1ma, t j =-20 ~ 125c 200 a i out =10ma 200 300 a i out =10ma, t j =-20 ~ 125c 400 a i out =50ma 600 1050 a i out =50ma, t j =-20 ~ 125c 1200 a i out =150ma 2000 3000 a i out =150ma, t j =-20 ~ 125c 4000 a off mode v inh < 0.18v 0 a quiescent current i q off mode v inh < 0.18v t j =-20 ~ 125c 2 a supply voltage rejection svr c byp =0.01 f, c o =10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, c o =10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 11 of 23 www.unisonic.com.tw qw-r102-024.g ? electrical characteristics(cont.) for v out =3.2v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =4.2v 3.136 3.2 3.264 v output voltage v out i out =1 ~ 150ma 3.104 3.296 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv t j =-20 ~ 125c, i out =0 5 mv i out =1ma 7 10 mv i out =1ma, t j =-20 ~ 125c 15 mv i out =10ma 40 60 mv i out =10ma, t j =-20 ~ 125c 90 mv i out =50ma 120 150 mv i out =50ma, t j =-20 ~ 125c 225 mv i out =150ma 280 350 mv dropout voltage v d i out =150ma, t j =-20 ~ 125c 575 mv i out =0 80 100 a t j =-20 ~ 125c, i out =0 150 a i out =1ma 100 150 a i out =1ma, t j =-20 ~ 125c 200 a i out =10ma 200 300 a i out =10ma, t j =-20 ~ 125c 400 a i out =50ma 600 1050 a i out =50ma, t j =-20 ~ 125c 1200 a i out =150ma 2000 3000 a i out =150ma, t j =-20 ~ 125c 4000 a off mode v inh < 0.18v 0 a quiescent current i q off mode v inh < 0.18v t j =-20 ~ 125c 2 a supply voltage rejection svr c byp =0.01 f, c o =10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, c o =10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 12 of 23 www.unisonic.com.tw qw-r102-024.g ? electrical characteristics(cont.) for v out =3.3v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =4.3v 3.234 3.3 3.366 v output voltage v out i out =1 ~ 150ma 3.201 3.399 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv t j =-20 ~ 125c, i out =0 5 mv i out =1ma 7 10 mv i out =1ma, t j =-20 ~ 125c 15 mv i out =10ma 40 60 mv i out =10ma, t j =-20 ~ 125c 90 mv i out =50ma 120 150 mv i out =50ma, t j =-20 ~ 125c 225 mv i out =150ma 280 350 mv dropout voltage v d i out =150ma, t j =-20 ~ 125c 575 mv i out =0 80 100 a t j =-20 ~ 125c, i out =0 150 a i out =1ma 100 150 a i out =1ma, t j =-20 ~ 125c 200 a i out =10ma 200 300 a i out =10ma, t j =-20 ~ 125c 400 a i out =50ma 600 1050 a i out =50ma, t j =-20 ~ 125c 1200 a i out =150ma 2000 3000 a i out =150ma, t j =-20 ~ 125c 4000 a off mode v inh < 0.18v 0 a quiescent current i q off mode v inh < 0.18v t j =-20 ~ 125c 2 a supply voltage rejection svr c byp =0.01 f, c o =10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, c o =10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 13 of 23 www.unisonic.com.tw qw-r102-024.g ? electrical characteristics(cont.) for v out =3.5v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =4.5v 3.430 3.5 3.570 v output voltage v out i out =1 ~ 150ma 3.395 3.605 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv t j =-20 ~ 125c, i out =0 5 mv i out =1ma 7 10 mv i out =1ma, t j =-20 ~ 125c 15 mv i out =10ma 40 60 mv i out =10ma, t j =-20 ~ 125c 90 mv i out =50ma 120 150 mv i out =50ma, t j =-20 ~ 125c 225 mv i out =150ma 280 350 mv dropout voltage v d i out =150ma, t j =-20 ~ 125c 575 mv i out =0 80 100 a t j =-20 ~ 125c, i out =0 150 a i out =1ma 100 150 a i out =1ma, t j =-20 ~ 125c 200 a i out =10ma 200 300 a i out =10ma, t j =-20 ~ 125c 400 a i out =50ma 600 1050 a i out =50ma, t j =-20 ~ 125c 1200 a i out =150ma 2000 3000 a i out =150ma, t j =-20 ~ 125c 4000 a off mode v inh < 0.18v 0 a quiescent current i q off mode v inh < 0.18v t j =-20 ~ 125c 2 a supply voltage rejection svr c byp =0.01 f, c o =10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, c o =10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 14 of 23 www.unisonic.com.tw qw-r102-024.g ? electrical characteristics(cont.) for v out =3.6v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =4.6v 3.528 3.6 3.672 v output voltage v out i out =1 ~ 150ma 3.492 3.708 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv t j =-20 ~ 125c, i out =0 5 mv i out =1ma 7 10 mv i out =1ma, t j =-20 ~ 125c 15 mv i out =10ma 40 60 mv i out =10ma, t j =-20 ~ 125c 90 mv i out =50ma 120 150 mv i out =50ma, t j =-20 ~ 125c 225 mv i out =150ma 280 350 mv dropout voltage v d i out =150ma, t j =-20 ~ 125c 575 mv i out =0 80 100 a t j =-20 ~ 125c, i out =0 150 a i out =1ma 100 150 a i out =1ma, t j =-20 ~ 125c 200 a i out =10ma 200 300 a i out =10ma, t j =-20 ~ 125c 400 a i out =50ma 600 1050 a i out =50ma, t j =-20 ~ 125c 1200 a i out =150ma 2000 3000 a i out =150ma, t j =-20 ~ 125c 4000 a off mode v inh < 0.18v 0 a quiescent current i q off mode v inh < 0.18v t j =-20 ~ 125c 2 a supply voltage rejection svr c byp =0.01 f, c o =10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, c o =10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 15 of 23 www.unisonic.com.tw qw-r102-024.g ? electrical characteristics(cont.) for v out =3.8v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =4.8v 3.724 3.8 3.876 v output voltage v out i out =1 ~ 150ma 3.686 3.914 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv t j =-20 ~ 125c, i out =0 5 mv i out =1ma 7 10 mv i out =1ma, t j =-20 ~ 125c 15 mv i out =10ma 40 60 mv i out =10ma, t j =-20 ~ 125c 90 mv i out =50ma 120 150 mv i out =50ma, t j =-20 ~ 125c 225 mv i out =150ma 280 350 mv dropout voltage v d i out =150ma, t j =-20 ~ 125c 575 mv i out =0 80 100 a t j =-20 ~ 125c, i out =0 150 a i out =1ma 100 150 a i out =1ma, t j =-20 ~ 125c 200 a i out =10ma 200 300 a i out =10ma, t j =-20 ~ 125c 400 a i out =50ma 600 1050 a i out =50ma, t j =-20 ~ 125c 1200 a i out =150ma 2000 3000 a i out =150ma, t j =-20 ~ 125c 4000 a off mode v inh < 0.18v 0 a quiescent current i q off mode v inh < 0.18v t j =-20 ~ 125c 2 a supply voltage rejection svr c byp =0.01 f, c o =10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, c o =10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 16 of 23 www.unisonic.com.tw qw-r102-024.g ? electrical characteristics(cont.) for v out =4.0v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =5.0v 3.920 4 4.080 v output voltage v out i out =1 ~ 150ma 3.880 4.120 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv i out =1ma 30 mv i out =10ma 87 mv i out =50ma 175 mv dropout voltage v d i out =150ma 280 350 mv i out =0 80 100 a i out =1ma 100 150 a i out =10ma 200 300 a i out =50ma 600 1050 a i out =150ma 2000 3000 a quiescent current i q off mode v inh < 0.18v 0 a supply voltage rejection svr c byp =0.01 f, c o =10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, c o =10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 17 of 23 www.unisonic.com.tw qw-r102-024.g ? electrical characteristics(cont.) for v out =4.7v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =5.7v 4.606 4.7 4.794 v output voltage v out i out =1 ~ 150ma 4.559 4.841 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv t j =-20 ~ 125c, i out =0 5 mv i out =1ma 7 10 mv i out =1ma, t j =-20 ~ 125c 15 mv i out =10ma 40 60 mv i out =10ma, t j =-20 ~ 125c 90 mv i out =50ma 120 150 mv i out =50ma, t j =-20 ~ 125c 225 mv i out =150ma 280 350 mv dropout voltage v d i out =150ma, t j =-20 ~ 125c 575 mv i out =0 80 100 a t j =-20 ~ 125c, i out =0 150 a i out =1ma 100 150 a i out =1ma, t j =-20 ~ 125c 200 a i out =10ma 200 300 a i out =10ma, t j =-20 ~ 125c 400 a i out =50ma 600 1050 a i out =50ma, t j =-20 ~ 125c 1200 a i out =150ma 2000 3000 a i out =150ma, t j =-20 ~ 125c 4000 a off mode v inh < 0.18v 0 a quiescent current i q off mode v inh < 0.18v t j =-20 ~ 125c 2 a supply voltage rejection svr c byp =0.01 f, c o =10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, c o =10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 18 of 23 www.unisonic.com.tw qw-r102-024.g ? electrical characteristics(cont.) for v out =5.0v parameter symbol test conditions min typ max unit operating input voltage v i(opr) 16 v v in =6.0v 4.900 5 5.100 v output voltage v out i out =1 ~ 150ma 4.850 5.150 v short circuit current i sc r l =0 400 ma line regulation v out v in =v out +1v ~ 16v, i out =1ma 30 mv i out =0 1 3 mv t j =-20 ~ 125c, i out =0 5 mv i out =1ma 7 10 mv i out =1ma, t j =-20 ~ 125c 15 mv i out =10ma 40 60 mv i out =10ma, t j =-20 ~ 125c 90 mv i out =50ma 120 150 mv i out =50ma, t j =-20 ~ 125c 225 mv i out =150ma 280 350 mv dropout voltage v d i out =150ma, t j =-20 ~ 125c 575 mv i out =0 80 100 a t j =-20 ~ 125c, i out =0 150 a i out =1ma 100 150 a i out =1ma, t j =-20 ~ 125c 200 a i out =10ma 200 300 a i out =10ma, t j =-20 ~ 125c 400 a i out =50ma 600 1050 a i out =50ma, t j =-20 ~ 125c 1200 a i out =150ma 2000 3000 a i out =150ma, t j =-20 ~ 125c 4000 a off mode v inh < 0.18v 0 a quiescent current i q off mode v inh < 0.18v t j =-20 ~ 125c 2 a supply voltage rejection svr c byp =0.01 f, c o =10 f, f=1khz 45 db control input logic low v il t j =-20 ~ 125c 0.15 v control input logic high v ih t j =-20 ~ 125c 2 v t j =-20 ~ 125c, v shdn =5v 5 15 a control input current i inh t j =-20 ~ 125c, v shdn =0v 0 -1 a output noise voltage en b=300hz ~ 50khz c byp =0.01 f, c o =10 f 30 v
ld2985 linear integrated circuit unisonic technologies co., ltd 19 of 23 www.unisonic.com.tw qw-r102-024.g ? reverse current test circuit
ld2985 linear integrated circuit unisonic technologies co., ltd 20 of 23 www.unisonic.com.tw qw-r102-024.g ? application information external capacitors like any low-dropout regulator, the utc ld2985 requires external capacitors for regulator stability. this capacitor must be selected to meet t he requirements of minimum capacitance an d equivalent series resistance. we suggest soldering input and outputting capacitors as close as possible to the relative pins. input capacitor an input capacitor whose value is 1 f is required with the utc ld2985 (amount of capacitance can be increased without limit). this capacitor must be located a distance of not mo re than 0.5" from the input pin of the device and returned to a clean analog ground. any good qua lity ceramic, tantalum or f ilm capacitors can be used for this capacitor. output capacitor the utc ld2985 is designed specifically to work with ceramic output capacitors. it may also be possible to use tantalum capacitors, but these are not as attractive for reasons of size and cost. by the way, the output capacitor must meet both the requirement for mini mum amount of capacitance and e.s.r. ( equivalent series resistance) value. due to the different loop gain, the stability improves fo r higher output versions and so the suggested minimum output capacitor value, if low e.s.r. ceramic type is used, is 1 f for output voltages equal or major than 3.8v, 2.2 f for v o going from 1.8 ~ 3.3v, and 3.3 f for the other versions. however, if an output capacitor lower than the suggested one is used, it's possible to make stable the regulator adding a resist or in series to the capacitor. important: the output capacitor must maintain it s esr in the stable region over the full operating temperature to assure stability. also, capacitor tolerance and variation with temp erature must be considered to assure the minimum amount of capacitance is provided at all times. this capacitor should be located not mo re than 0.5" from the output pin of the device and returned to a clean analog ground. inhibit input operation the inhibit pin can be used to turn off the regulator when pulled low, so drastically reducing the current consumption down to less than 1 a. when the inhibit feature is not used, this pin must be tied to v i to keep the regulator output on at all times. to a ssure proper operation, the signal source used to drive the inhibit pin must be able to swing above and below the specified thresholds lis ted in the electrical char acteristics section under v ih v il . any slew rate can be used to drive the inhibit. reverse current the power transistor used in the utc ld2985 has not an inherent diode connected between the regulator input and output. if the output is forced above the input, no current will flow from the output to the input across the series pass transistor. when a v rev voltage is applied on the output, the reve rse current measured flows to the gnd across the two feedback resistors. this current typical value is 160 a. r 1 and r 2 resistors are implanted type; typical values are, respectively, 42.6k ? and 51.150k ? .
ld2985 linear integrated circuit unisonic technologies co., ltd 21 of 23 www.unisonic.com.tw qw-r102-024.g ? typical characteristics (t j =25c, c i =1 f, c o =2.2 f, c byp =100nf) 2.58 -25 -50 25 0 2.46 2.50 2.56 75 2.54 2.48 2.44 50 100 output voltage vs temperature 2.52 tc (c) 2.42 2.40 output voltage, v out (v) v in =3.5v i out =1ma 2000 25 0 75 50 400 1600 125 1200 100 150 quiescent current vs load current 800 output current, i out (ma) 0 quiescent current, i q ( a) v out =2.5v c by =10nf 125 2.60 175 -25 -50 25 0 0.2 0.3 75 0.1 50 100 dropout voltage vs temperature 0 dropout voltage, v d (v) v out =2.5v c by =10nf i out =150ma i out =50ma i out =10ma i out =1ma -25 -50 25 0 2.0 3.5 75 1.5 50 100 quiescent current vs temperature 0 quiescent current, i q (ma) v out =2.5v c by =10nf i out =150ma 3.0 2.5 1.0 0.5 tc (c) tc (c) 125 25 0 75 50 100 150 250 125 200 100 150 dropout voltage vs output current output current, i out (ma) 50 0 dropout voltage, v d (mv) v out =2.5v -25 -50 25 0 60 90 75 50 50 100 supply voltage rejection vs temperature 20 supply voltage rejection, svr (db) co=10 f 80 70 40 30 co=1 f f osc =1khz v in =3.5 ~ 6.5v i out =10ma tc (c) 125 175 0.4 125
ld2985 linear integrated circuit unisonic technologies co., ltd 22 of 23 www.unisonic.com.tw qw-r102-024.g ? typical characteristics(cont.) (t j =25c, c i =1 f, c o =2.2 f, c byp =100nf) 80 25 0 75 50 60 125 40 100 150 supply voltage rejection vs output current 20 output current, i out (ma) 0 supply voltage rejection, svr (db) v in =3.5 ~ 6.5v c o =10 f fosc=1khz 70 60 40 supply voltage rejection vs frequency 20 frequency, f (khz) 0 supply voltage rejection, svr (db) 50 30 10 10 1 10 2 10 3 10 4 v in =3.5 ~ 6.5v i out =10ma v out =2.5v c o =1 f 80 25 0 75 50 60 125 40 100 150 supply voltage rejection vs output current 20 output current, i out (ma) 0 v in =3.5 ~ 6.5v c o =1 f fosc=1khz line transient v in v out v out =2.5v, i out =50ma, no c in, c out =4.7 f, t r =t f =20ns ch1 500mv 20.0mv ch2 m 10.0 s ch1 3.96v ch2 1 1 100 175 supply voltage rejection, svr (db) 100 175 80 10 5 line transient v in v out v out =2.5v, i out =50ma, no c in, c out =4.7 f, t r =t f =1 s 500mv 20.0mv ch2 m 10.0 s ch1 3.96v 1 ch1 ch2 2 frequency, f (khz) 70 60 40 supply voltage rejection vs frequency 20 0 supply voltage rejection, svr (db) 50 30 10 10 1 10 2 10 3 10 4 v in =2.8 ~ 5.8v i out =10ma v out =1.8v c o =10 f 10 5 tek run:5.00ms/s tek run:5.00ms/s
ld2985 linear integrated circuit unisonic technologies co., ltd 23 of 23 www.unisonic.com.tw qw-r102-024.g ? typical characteristics(cont.) (t j =25c, c i =1 f, c o =2.2 f, c byp =100nf) 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 lif e support appliances, devices or systems where malfunction of these products can be reasonably expe cted to result in personal injury. reproduction in whole or in part is prohibited without the prior writ ten 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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