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1/12 november 2001 n very low dropout voltage (120mv at 50ma and 7mv at 1ma load) n very low quiescent current (375 m a typ. at 50ma load and 75 m a at 1ma) n output current up to 50ma n logic controlled electronic shutdown n output voltgae of 1.8, 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 25 c, a version) n supply voltage rejection: 45db (typ) n only 1mf for stability n low output noise voltage 30mvrms n smallest pasckage sot23-5l n temperature range: -40c to 125c description the ld2982 is a 50ma 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 1ma 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. ld2982 series very low drop and low noise voltage regulator with inhibit function schematic diagram sot23-5l
ld2982 series 2/12 absolute maximum ratings absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditi on 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 ld2982am18r ld2982bm18r 1.8v ld2982am25r ld2982bm25r 2.5v ld2982am28r ld2982bm28r 2.8v ld2982am30r ld2982bm30r 3.0v ld2982am31r ld2982bm31r 3.1v ld2982am32r ld2982bm32r 3.2v ld2982am33r ld2982bm33r 3.3v ld2982am35r ld2982bm35r 3.5v ld2982am36r ld2982bm36r 3.6v ld2982am38r ld2982bm38r 3.8v ld2982am40r ld2982bm40r 4.0v ld2982am47r LD2982BM47R 4.7v ld2982am50r ld2982bm50r 5.0v
ld2982 series 3/12 electrical characteristics for ld2982a (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 50ma 1.773 1.827 v i o = 1 to 50ma t j = -40 to 125 c 1.764 1.836 v v o output voltage v i = 3.5v 2.475 2.5 2.525 v i o = 1 to 50ma 2.462 2.537 v i o = 1 to 50ma t j = -40 to 125 c 2.45 2.55 v v o output voltage v i = 3.8v 2.772 2.8 2.828 v i o = 1 to 50ma 2.758 2.842 v i o = 1 to 50ma t j = -40 to 125 c 2.744 2.856 v v o output voltage v i = 4.0v 2.970 3.0 3.030 v i o = 1 to 50ma 2.955 3.045 v i o = 1 to 50ma t j = -40 to 125 c 2.94 3.06 v v o output voltage v i = 4.1v 3.069 3.1 3.131 v i o = 1 to 50ma 3.053 3.146 v i o = 1 to 50ma t j = -40 to 125 c 3.038 3.162 v v o output voltage v i = 4.2v 3.168 3.2 3.232 v i o = 1 to 50ma 3.152 3.248 v i o = 1 to 50ma t j = -40 to 125 c 3.136 3.264 v v o output voltage v i = 4.3v 3.267 3.3 3.333 v i o = 1 to 50ma 3.250 3.349 v i o = 1 to 50ma t j = -40 to 125 c 3.234 3.366 v v o output voltage v i = 4.5v 3.465 3.5 3.535 v i o = 1 to 50ma 3.447 3.552 v i o = 1 to 50ma t j = -40 to 125 c 3.43 3.57 v v o output voltage v i = 4.6v 3.564 3.6 3.636 v i o = 1 to 50ma 3.546 3.654 v i o = 1 to 50ma t j = -40 to 125 c 3.528 3.672 v v o output voltage v i = 4.8v 3.762 3.8 3.838 v i o = 1 to 50ma 3.743 3.857 v i o = 1 to 50ma t j = -40 to 125 c 3.724 3.876 v v o output voltage v i = 5.0v 3.96 4 4.04 v i o = 1 to 50ma 3.94 4.06 v i o = 1 to 50ma t j = -40 to 125 c 3.92 4.08 v v o output voltage v i = 5.7v 4.653 4.7 4.747 v i o = 1 to 50ma 4.629 4.77 v i o = 1 to 50ma t j = -40 to 125 c 4.606 4.794 v v o output voltage v i = 6.0v 4.95 5 5.05 v i o = 1 to 50ma 4.925 5.075 v i o = 1 to 50ma t j = -40 to 125 c 4.9 5.1 v i sc short circuit current r l = 0 150 ma
ld2982 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 d quiescent current i o = 0 65 95 m a i o = 0 t j = -40 to 125 c 125 m a i o = 1ma 80 110 m a i o = 1ma t j = -40 to 125 c 170 m a i o = 10ma 140 220 m a i o = 10ma t j = -40 to 125 c 460 m a i o = 50ma 375 600 m a i o = 50ma t j = -40 to 125 c 1200 m a off mode v inh <0.18v 0 m a off mode v inh <0.18v t j = -40 to 125 c 1 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
ld2982 series 5/12 electrical characteristics for ld2982b (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 50ma 1.764 1.836 v i o = 1 to 50ma t j = -40 to 125 c 1.737 1.863 v v o output voltage v i = 3.5v 2.462 2.5 2.537 v i o = 1 to 50ma 2.45 2.55 v i o = 1 to 50ma t j = -40 to 125 c 2.412 2.587 v v o output voltage v i = 3.8v 2.758 2.8 2.842 v i o = 1 to 50ma 2.744 2.856 v i o = 1 to 50ma t j = -40 to 125 c 2.702 2.898 v v o output voltage v i = 4.0v 2.955 3.0 3.045 v i o = 1 to 50ma 2.94 3.06 v i o = 1 to 50ma t j = -40 to 125 c 2.895 3.105 v v o output voltage v i = 4.1v 3.053 3.1 3.146 v i o = 1 to 50ma 3.038 3.162 v i o = 1 to 50ma t j = -40 to 125 c 2.991 3.208 v v o output voltage v i = 4.2v 3.152 3.2 3.248 v i o = 1 to 50ma 3.136 3.264 v i o = 1 to 50ma t j = -40 to 125 c 3.088 3.312 v v o output voltage v i = 4.3v 3.250 3.3 3.349 v i o = 1 to 50ma 3.234 3.366 v i o = 1 to 50ma t j = -40 to 125 c 3.184 3.415 v v o output voltage v i = 4.5v 3.447 3.5 3.552 v i o = 1 to 50ma 3.430 3.370 v i o = 1 to 50ma t j = -40 to 125 c 3.377 3.662 v v o output voltage v i = 4.6v 3.546 3.6 3.654 v i o = 1 to 50ma 3.528 3.672 v i o = 1 to 50ma t j = -40 to 125 c 3.474 3.726 v v o output voltage v i = 4.8v 3.743 3.8 3.857 v i o = 1 to 50ma 3.724 3.876 v i o = 1 to 50ma t j = -40 to 125 c 3.667 3.933 v v o output voltage v i = 5.0v 3.94 4 4.06 v i o = 1 to 50ma 3.92 4.08 v i o = 1 to 50ma t j = -40 to 125 c 3.86 4.14 v v o output voltage v i = 5.7v 4.629 4.7 4.77 v i o = 1 to 50ma 4.606 4.794 v i o = 1 to 50ma t j = -40 to 125 c 4.535 4.864 v v o output voltage v i = 6.0v 4.925 5 5.075 v i o = 1 to 50ma 4.9 5.1 v i o = 1 to 50ma t j = -40 to 125 c 4.825 5.175 v i sc short circuit current r l = 0 400 ma
ld2982 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 d quiescent current i o = 0 65 95 m a i o = 0 t j = -40 to 125 c 125 m a i o = 1ma 80 110 m a i o = 1ma t j = -40 to 125 c 170 m a i o = 10ma 140 220 m a i o = 10ma t j = -40 to 125 c 460 m a i o = 50ma 375 600 m a i o = 50ma t j = -40 to 125 c 1200 m a off mode v inh <0.18v 0 m a off mode v inh <0.18v t j = -40 to 125 c 1 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
ld2982 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
ld2982 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 .5 v , i o = 5 0 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
ld2982 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
ld2982 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 e0.95 37.4 e1 1.9 74.8 l 0.35 0.55 13.7 21.6 sot23-5l mechanical data
ld2982 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
ld2982 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 ? 2001 stmicroelectronics - printed in italy - all rights reserved stmicroelectronics group of companies australia - brazil - china - finland - france - germany - hong kong - india - italy - japan - malaysia - malta - morocco singapore - spain - sweden - switzerland - united kingdom ? http://www.st.com

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