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1/12 january 2003 n very low dropout voltage (280mv at 150ma and 7mv at 1ma load) n very low quiescent current (2.2ma typ. at 150ma load and 75 m aatno load) n output current up to 150ma n logic controlled electronic shutdown n outputvoltgaeof1.8,2.5,2.8,3,3.1, 3.2, 3.3, 3.5, 3.6, 3.8, 4, 4.7, 5v n internal current and thermal limit n available in 1% tollerance (at 25c, aversion) n low output noise voltage 30 m vrms n smallest pasckage sot23-5l n temperature range: -40c to 125c description the ld2985 is a 150ma fixed output voltage regulator. the ultra low drop voltage and the low 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 m 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 possible to put a part of the board in standby, decreasing the total power consumption. an internal capacitor connected to the bypass pin c out 30mvrms. typical application are in cellular phone, palmtop/ laptop computer, personal fdigital assistant (pda), personal stereo, camdorder and camera. ld2985 series very low drop and low noise voltage regulator with inhibit function schematic diagram sot23-5l
ld2985 series 2/12 absolute maximum ratings absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these condition is not implied. thermal data connection diagram (top view) pin description ordering codes symbol parameter value unit v i dc input voltage 16 v v inh inhibit input voltage 16 v i o output current internally limited p tot power dissipation internally limited t stg storage temperature range -65 to +150 c t op operating junction temperature range -40 to +125 c symbol parameter sot23-5l unit r thj-case thermal resistance junction-case 81 c/w sot23-5l pin n symbol name and function 1 in input port 2 gnd ground pin 3 inhibit control switch on/off. inhibit is not internally pulled-up; it cannot be left floating. disable the device when connected to gnd or to a positive voltage less than 0.18v 4 bypass bypass pin: capacitor to be connected to gnd in order to improve the thermal noise performances. 5 out output port a version b version output voltages ld2985am18r ld2985bm18r 1.8v ld2985am25r ld2985bm25r 2.5v ld2985am28r ld2985bm28r 2.8v ld2985am30r ld2985bm30r 3.0v ld2985am31r ld2985bm31r 3.1v ld2985am32r ld2985bm32r 3.2v ld2985am33r ld2985bm33r 3.3v ld2985am35r ld2985bm35r 3.5v ld2985am36r ld2985bm36r 3.6v ld2985am38r ld2985bm38r 3.8v ld2985am40r ld2985bm40r 4.0v LD2985AM47R ld2985bm47r 4.7v ld2985am50r ld2985bm50r 5.0v
ld2985 series 3/12 electrical characteristics for ld2985a (t j = 25c, v in =v out +1v, i out =1ma, v shdn =2v, c i =1 m f, c o =1 m f, unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage v i = 2.8v 1.782 1.8 1.818 v i o = 1 to 150ma 1.755 1.845 v i o = 1 to 150ma t j = -40 to 125 c 1.737 1.863 v v o output voltage v i = 3.5v 2.475 2.5 2.525 v i o = 1 to 150ma 2.4375 2.5625 v i o = 1 to 150ma t j = -40 to 125 c 2.4125 2.5875 v v o output voltage v i = 3.8v 2.772 2.8 2.828 v i o = 1 to 150ma 2.730 2.870 v i o = 1 to 150ma t j = -40 to 125 c 2.702 2.898 v v o output voltage v i = 4.0v 2.970 3.0 3.030 v i o = 1 to 150ma 2.925 3.075 v i o = 1 to 150ma t j = -40 to 125 c 2.895 3.105 v v o output voltage v i = 4.1v 3.069 3.1 3.131 v i o = 1 to 150ma 3.022 3.1775 v i o = 1 to 150ma t j = -40 to 125 c 2.9915 3.2085 v v o output voltage v i = 4.2v 3.168 3.2 3.232 v i o = 1 to 150ma 3.120 3.280 v i o = 1 to 150ma t j = -40 to 125 c 3.088 3.312 v v o output voltage v i = 4.3v 3.267 3.3 3.333 v i o = 1 to 150ma 3.2175 3.3825 v i o = 1 to 150ma t j = -40 to 125 c 3.1845 3.4155 v v o output voltage v i = 4.5v 3.465 3.5 3.535 v i o = 1 to 150ma 3.412 3.587 v i o = 1 to 150ma t j = -40 to 125 c 3.377 3.622 v v o output voltage v i = 4.6v 3.564 3.6 3.636 v i o = 1 to 150ma 3.510 3.690 v i o = 1 to 150ma t j = -40 to 125 c 3.474 3.726 v v o output voltage v i = 4.8v 3.762 3.8 3.838 v i o = 1 to 150ma 3.705 3.895 v i o = 1 to 150ma t j = -40 to 125 c 3.667 3.933 v v o output voltage v i = 5.0v 3.96 4 4.04 v i o = 1 to 150ma 3.9 4.1 v i o = 1 to 150ma t j = -40 to 125 c 3.86 4.14 v v o output voltage v i = 5.7v 4.653 4.7 4.747 v i o = 1 to 150ma 4.582 4.817 v i o = 1 to 150ma t j = -40 to 125 c 4.5355 4.8645 v v o output voltage v i = 6.0v 4.95 5 5.05 v i o = 1 to 150ma 4.875 5.125 v i o = 1 to 150ma t j = -40 to 125 c 4.825 5.175 v i sc short circuit current r l = 0 400 ma
ld2985 series 4/12 d v o / d v i line regulation v i =v o +1v to 16v, i o = 1ma 0.003 0.014 %/v i v i =v o +1v to 16v, i o = 1ma t j = -40 to 125 c 0.032 %/v i v d dropout voltage i o =0 1 3 mv i o =0 t j = -40 to 125 c 5mv i o =1ma 7 10 mv i o =1ma t j = -40 to 125 c 15 mv i o = 10ma 40 60 mv i o = 10ma t j = -40 to 125 c 90 mv i o = 50ma 120 150 mv i o = 50ma t j = -40 to 125 c 225 mv i o = 150ma 280 350 mv i o = 150ma tj= -40 to 125 c 575 mv i d quiescent current i o = 0 80 100 m a i o =0 t j = -40 to 125 c 150 m a i o = 1ma 100 150 m a i o =1ma t j = -40 to 125 c 200 m a i o = 10ma 200 300 m a i o = 10ma t j = -40 to 125 c 400 m a i o = 50ma 600 900 m a i o = 50ma t j = -40 to 125 c 1200 m a i o = 150ma 2000 3000 m a i o = 150ma t j = -40 to 125 c 4000 m a off mode v inh <0.18v 0 m a off mode v inh <0.18v t j = -40 to 125 c 2 m a svr supply voltage rejection c byp = 0.01 m fc o =10 m f f = 1khz 45 db v il control input logic low t j = -40 to 125 c 0.15 v v ih control input logic high t j = -40 to 125 c 2v i inh control input current t j = -40 to 125 c v shdn =5v 515 m a t j = -40 to 125 c v shdn =0v 0-1 m a en output noise voltage b= 300hz to 50khz c byp = 0.01 m fc o =10 m f 30 m v symbol parameter test conditions min. typ. max. unit
ld2985 series 5/12 electrical characteristics for ld2985b (t j = 25c, v in =v out +1v, i out =1ma, v shdn =2v, c i =1 m f, c o =1 m f, unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage v i = 2.8v 1.773 1.8 1.827 v i o = 1 to 150ma 1.746 1.854 v i o = 1 to 150ma t j = -40 to 125 c 1.728 1.872 v v o output voltage v i = 3.5v 2.4625 2.5 2.5375 v i o = 1 to 150ma 2.425 2.575 v i o = 1 to 150ma t j = -40 to 125 c 2.4 2.6 v v o output voltage v i = 3.8v 2.758 2.8 2.842 v i o = 1 to 150ma 2.716 2.884 v i o = 1 to 150ma t j = -40 to 125 c 2.688 2.912 v v o output voltage v i = 4.0v 2.955 3.0 3.045 v i o = 1 to 150ma 2.91 3.09 v i o = 1 to 150ma t j = -40 to 125 c 2.88 3.12 v v o output voltage v i = 4.1v 3.0535 3.1 3.1465 v i o = 1 to 150ma 3.007 3.193 v i o = 1 to 150ma t j = -40 to 125 c 2.976 3..224 v v o output voltage v i = 4.2v 3.152 3.2 3.248 v i o = 1 to 150ma 3.104 3.296 v i o = 1 to 150ma t j = -40 to 125 c 3.072 3.328 v v o output voltage v i = 4.3v 3.2505 3.3 3.3495 v i o = 1 to 150ma 3.201 3.399 v i o = 1 to 150ma t j = -40 to 125 c 3.168 3.432 v v o output voltage v i = 4.5v 3.447 3.5 3.552 v i o = 1 to 150ma 3.395 3.605 v i o = 1 to 150ma t j = -40 to 125 c 3.360 3.640 v v o output voltage v i = 4.6v 3.546 3.6 3.654 v i o = 1 to 150ma 3.492 3.708 v i o = 1 to 150ma t j = -40 to 125 c 3.456 3.744 v v o output voltage v i = 4.8v 3.743 3.8 3.857 v i o = 1 to 150ma 3.686 3.914 v i o = 1 to 150ma t j = -40 to 125 c 3.648 3.952 v v o output voltage v i = 5.0v 3.94 4 4.06 v i o = 1 to 150ma 3.88 4.12 v i o = 1 to 150ma t j = -40 to 125 c 3.84 4.16 v v o output voltage v i = 5.7v 4.6295 4.7 4.7705 v i o = 1 to 150ma 4.559 4.841 v i o = 1 to 150ma t j = -40 to 125 c 4.512 4.888 v v o output voltage v i = 6.0v 4.925 5 5.075 v i o = 1 to 150ma 4.85 5.15 v i o = 1 to 150ma t j = -40 to 125 c 4.8 5.2 v i sc short circuit current r l = 0 400 ma
ld2985 series 6/12 d v o / d v i line regulation v i =v o +1v to 16v, i o = 1ma 0.003 0.014 %/v i v i =v o +1v to 16v, i o = 1ma t j = -40 to 125 c 0.032 %/v i v d dropout voltage i o =0 1 3 mv i o =0 t j = -40 to 125 c 5mv i o =1ma 7 10 mv i o =1ma t j = -40 to 125 c 15 mv i o = 10ma 40 60 mv i o = 10ma t j = -40 to 125 c 90 mv i o = 50ma 120 150 mv i o = 50ma t j = -40 to 125 c 225 mv i o = 150ma 280 350 mv i o = 150ma t j = -40 to 125 c 575 mv i d quiescent current i o = 0 80 100 m a i o =0 t j = -40 to 125 c 150 m a i o = 1ma 100 150 m a i o =1ma t j = -40 to 125 c 200 m a i o = 10ma 200 300 m a i o = 10ma t j = -40 to 125 c 400 m a i o = 50ma 600 900 m a i o = 50ma t j = -40 to 125 c 1200 m a i o = 150ma 2000 3000 m a i o = 150ma t j = -40 to 125 c 4000 m a off mode v inh <0.18v 0 m a off mode v inh <0.18v t j = -40 to 125 c 2 m a svr supply voltage rejection c byp = 0.01 m fc o =10 m f f = 1khz 45 db v il control input logic low t j = -40 to 125 c 0.15 v v ih control input logic high t j = -40 to 125 c 2v i inh control input current t j = -40 to 125 c v shdn =5v 515 m a t j = -40 to 125 c v shdn =0v 0-1 m a en output noise voltage b= 300hz to 50khz c byp = 0.01 m fc o =10 m f 30 m v symbol parameter test conditions min. typ. max. unit
ld2985 series 7/12 typical characteristics (unless otherwise specified t j = 25c, c i =1 m f, c o =2.2 m f, c byp =100nf) figure 1 : output voltage vs temperature figure 2 : dropout voltage vs temperature figure 3 : dropout voltage vs output current figure 4 : quiescent current vs load current figure 5 : quiescent current vs temperature figure 6 : supply voltage rejection vs temperature
ld2985 series 8/12 figure 7 : supply voltage rejection vs output current figure 8 : supply voltage rejection vs output current figure 9 : supply voltage rejection vs frequency figure 10 : supply voltage rejection vs frequency figure 11 : line transient figure 12 : line transient v o = 2 . 5v , i o = 50 m a ,no c i , c o = 4 . 7 m f , t r = t f = 2 ns v o = 2 .5 v , i o =5 0 m a ,no c i , c o = 4 .7 m f ,t r =t f = 1 m s
ld2985 series 9/12 figure 13 : load transient figure 14 : load transient v o = 2 .5 v , i o = 0 to 5 0 m a ,no c i , c o = 10 m f ,t s =t f = 2 ns v o = 2 .5 v , i o = 0 to 5 0 m a ,no c i , c o = 4 .7 m f ,t s =t f = 2 ns
ld2985 series 10/12 dim. mm. mils min. typ max. min. typ. max. a 0.90 1.45 35.4 57.1 a1 0.00 0.15 0.0 5.9 a2 0.90 1.30 35.4 51.2 b 0.35 0.50 13.7 19.7 c 0.09 0.20 3.5 7.8 d 2.80 3.00 110.2 118.1 e 2.60 3.00 102.3 118.1 e1 1.50 1.75 59.0 68.8 e.95 37.4 e1 1.9 74.8 l 0.35 0.55 13.7 21.6 sot23-5l mechanical data 0
ld2985 series 11/12 dim. mm. inch min. typ max. min. typ. max. a 180 7.086 c 12.8 13.0 13.2 0.504 0.512 0.519 d 20.2 0.795 n 60 2.362 t 14.4 0.567 ao 3.13 3.23 3.33 0.123 0.127 0.131 bo 3.07 3.17 3.27 0.120 0.124 0.128 ko 1.27 1.37 1.47 0.050 0.054 0.0.58 po 3.9 4.0 4.1 0.153 0.157 0.161 p 3.9 4.0 4.1 0.153 0.157 0.161 tape & reel sot23-xl mechanical data
ld2985 series 12/12 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result f rom its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specificati ons mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectronics. ? the st logo is a registered trademark of stmicroelectronics ? 2003 stmicroelectronics - printed in italy - all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia - malt a - morocco singapore - spain - sweden - switzerland - united kingdom - united states. ? http://www.st.com

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