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lm723 high precision voltage regulator september 1998 n input voltage up to 40v n output voltage adjustable from 2 to 37v n positive or negative supply operation n series, shunt, switching or floating operation n output current to 150ma without external pass transistor n adjustable current limiting description the lm723 is a monolithic integrated programmable voltage regulator, assembled in 14-lead dual in-line plastic and so-14 micropackage. the circuit provides internal current limiting. when the output current excedes 150ma an external npn or pnp pass element may be used. provisions are made for adjust able current limiting and remote shut-down. ? block diagram plastic dip-14 so-14 1/12
absolute maximum ratings symbol parameter value unit lm723 lm723c v i dc input voltage 40 40 v d v i-o dropout voltage 40 40 v i o output current 150 150 m a i ref current from v ref 15 25 ma t op operating temperature -55 to 125 0 to 70 o c t stg storage temperature -65 to 150 -65 to 150 o c t j junction temperature 150 125 o c pin connection (top views) absolute maximum ratings symbol parameter plastic dip-14 so-14 unit r thj-amb thermal resistance junction-ambient max 200 160 o c/w test circuit (pin configuration relative to the plastic package) v i = 12v v o = 5v i o = 1ma r 1 /r 2 10k w order codes type plastic dip-14 so-14 lm723 lm723c lm723n LM723CN lm723cd lm723 2/12
electrical characteristics for lm723c (refer to the test circuits, t amb = 25 o c, unless otherwise specified) symbol parameter test conditions min. typ. max. unit d v o / d v i line regulation v i = 12 to 15v v i = 12 to 40v v i = 12 to 15v 0 o c t amb 70 o c 0.01 0.1 0.1 0.5 0.3 % % % d v o /v o load regulation i o = 1 to 50 ma i o = 1 to 10 ma 0 o c t amb 70 o c 0.03 0.2 0.6 % % v ref reference voltage i ref = 160 m a 6.8 7.15 7.5 v svr supply voltage rejection f = 100 hz to 10 khz c ref = 0 f = 100 hz to 10 khz c ref = 5 m f 74 86 db db d v o / d t output voltage drift 150 ppm/ o c i sc output current limit r sc = 10 w v o = 0 65 ma v i input voltage range 9.5 40 v v o output voltage range 2 37 v v o -v i 338v i d quiescent current v i = 30 v i o = 0 ma 2.3 4 ma k vh long term stability 0.1 %/1000 hrs e n output noise voltage bw = 100 hz to 10 khz c ref = 0 bw = 100 hz to 10 khz c ref = 5 m f 20 2.5 m v m v electrical characteristics for lm723 (refer to the test circuits, t amb = 25 o c, unless otherwise specified) symbol parameter test conditions min. typ. max. unit d v o / d v i line regulation v i = 12 to 15v v i = 12 to 40v v i = 12 to 15v -55 o c t amb 125 o c 0.01 0.02 0.1 0.2 0.3 % % % d v o /v o load regulation i o = 1 to 50 ma i o = 1 to 10 ma -55 o c t amb 125 o c 0.03 0.15 0.6 % % v ref reference voltage i ref = 160 m a 6.95 7.15 7.35 v svr supply voltage rejection f = 100 hz to 10 khz c ref = 0 f = 100 hz to 10 khz c ref = 5 m f 74 86 db db d v o / d t output voltage drift 150 ppm/ o c i sc output current limit r sc = 10 w v o = 0 65 ma v i input voltage range 9.5 40 v v o output voltage range 2 37 v v o -v i 338v i d quiescent current v i = 30 v i o = 0 ma 2.3 5 ma k vh long term stability 0.1 %/1000 hrs e n output noise voltage bw = 100 hz to 10 khz c ref = 0 bw = 100 hz to 10 khz c ref = 5 m f 20 2.5 m v m v lm723 3/12
figure 3 : current limiting characteristics vs. junction temperature. figure 4 : load regulation characteristics without current limiting. figure 5 : load regulation characteristics with current limiting. figure 6 : load regulation characteristics with current limiting figure 1 : maximum output current vs. voltage drop. figure 2 : current limiting characteristics. lm723 4/12
figure 9 : quiescent drain current vs. input voltage. figure 10 : line transient response. figure 11 : load transient response. figure 12 : output impedance vs. frequency. figure 7 : line regulation vs. voltage drop. figure 8 : load regulation vs. voltage drop. lm723 5/12
table 1: resistor values (k w ) for standard output voltages output voltage applicable figures fixed output 5% output adjustable 10% * r1 r2 r1 p1 r2 +3 13, 16, 17, 18, 21, 23 4.12 3.01 1.8 0.5 1.2 +5 13, 16, 17, 18, 21, 23 2.15 4.99 0.75 0.5 2.2 +6 13, 16, 17, 18, 21, 23 1.15 6.04 0.5 0.5 2.7 +9 14, 16, 17, 18, 21, 23 1.87 7.15 0.75 1 2.7 +12 14, 16, 17, 18, 21, 23 4.87 7.15 2 1 3 +15 14, 16, 17, 18, 21, 23 7.87 7.15 3.3 1 3 +28 14, 16, 17, 18, 21, 23 21 7.15 5.6 1 2 +45 19 3.57 48.7 2.2 10 39 +75 19 3.57 78.7 2.2 10 68 +100 19 3.57 102 2.2 10 91 +250 19 3.57 255 2.2 10 240 -6** 15 3.57 2.43 1.2 0.5 0.75 -9 15 3.48 5.36 1.2 0.5 2 -12 15 3.57 8.45 1.2 0.5 3.3 -15 15 3.65 11.5 1.2 0.5 4.3 -28 15 3.57 24.3 1.2 0.5 10 -45 20 3.57 21.2 2.2 10 33 -100 20 3.57 97.6 2.2 10 91 -250 20 3.57 249 2.2 10 240 note: * replace r1/r2 divider with the circuit of fig24. ** v+ must be connected to a +3v or greater supply. table 2: formulae for intermediate out put voltages outputs from +2 to +7v fig.13, 16, 17, 18, 21, 23 v o = [ v ref x r 2 r 1 + r 2 ] outputs from +4 to +250v fig.19 v o = ? v ref 2 x r 2 - r 1 r 1 ? ; r 3 = r 4 current limiting i limit = v sense r sc outputs from +7 to +37v fig.14, 16, 17, 18, 21, 23 v o = [ v ref x r 1 + r 2 r 2 ] outputs from -6 to -250v fig.15, 20 v o = ? v ref 2 x r 1 + r 2 r 1 ? ; r 3 = r 4 foldback current limiting i knee = ? v o r 3 r sc r 4 x v sense ( r 3 + r 4 ) r sc r 4 ? i short ckt = ? v sense r sc x r 3 + r 4 r 4 ? lm723 6/12
application information (pin numbers relative to the plastic package). figure 13 : basic low voltage regulator (v o = 2 to 7v). figure 14 : basic high voltage regulator (v o = 7 to 37v). note; r 3 = r 1 r 2 r 1 + r 2 for minimum temperature drift. r3 may be eliminated for minimum component count. typical performance regulated output voltage .................................................... 5v line regulation ( d v i = 3v) ............................................. 0.5mv load regulation ( d i o = 50ma) ....................................... 1.5mv note; r 3 = r 1 r 2 r 1 + r 2 for minimum temperature drift. r3 may be eliminated for minimum component count. typical performance regulated output voltage.................................................. 15v line regulation ( d v i = 3v) ............................................. 1.5mv load regulation ( d i o = 50ma)....................................... 4.5mv figure 15 : negative voltage regulator. figure 16 : positive voltage regulator (external typical performance regulated output voltage .................................................. 15v line regulation ( d v i = 3v)................................................. 1mv load regulation ( d i o = 100ma) ........................................ 2mv typical performance regulated output voltage............................................... + 15v line regulation ( d v i = 3v) ............................................. 1.5mv load regulation ( d i o = 1a) ............................................. 15mv lm723 7/12
application information (continued). figure 17 : positive voltage regulator (external pnp pass transistor) figure 18 : foldback current limiting typical performance regulated output voltage .................................................... 5v line regulation ( d v i = 3v) ............................................. 0.5mv load regulation ( d i o = 1 a) ........................................... 1.5mv typical performance regulated output voltage................................................... 5 v line regulation ( d v i = 3v) ............................................. 0.5mv load regulation ( d i o = 10ma).......................................... 1mv current limit knee ......................................................... 20 ma figure 19 : positive floating regulator figure 20 : negative floating regulator typical performance regulated output voltage ............................................... 100 v line regulation ( d v i = 20v)........................................... 15 mv load regulation ( d i o = 50ma) ...................................... 20 mv typical performance regulated output voltage............................................ - 100 v line regulation ( d v i = 20v) ........................................... 30 mv load regulation ( d i o = 100 ma).................................... 20 mv lm723 8/12
application information (continued). figure 21 : positive switching regulator figure 22 : remote shutdown regulator with current limiting typical performance regulated output voltage ................................................... 5 v line regulation ( d v i = 30 v) .......................................... 10 mv load regulation ( d i o = 2 a) ........................................... 80 mv note: current limit transistor may be used for shutdown if current limiting is not r equired. typical performance regulated output voltage................................................... 5 v line regulation ( d v i = 3 v) ........................................... 0.5 mv load regulation ( d i o = 50 ma)..................................... 1.5 mv figure 23 : shunt regulator. figure 24 : output voltage adjust typical performance regulated output voltage ................................................... 5 v line regulation ( d v i = 10 v)............................................. 2 mv load regulation ( d i o = 100 ma) ...................................... 5 mv lm723 9/12
dim. mm inch min. typ. max. min. typ. max. a1 0.51 0.020 b 1.39 1.65 0.055 0.065 b0.5 0.020 b1 0.25 0.010 d200.787 e8.5 0.335 e2.54 0.100 e3 15.24 0.600 f7.10.280 i5.10.201 l3.3 0.130 z 1.27 2.54 0.050 0.100 p001a plastic dip-14 mechanical data lm723 10/12
dim. mm inch min. typ. max. min. typ. max. a1.750.068 a1 0.1 0.2 0.003 0.007 a2 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 c0.5 0.019 c1 45 (typ.) d 8.55 8.75 0.336 0.344 e 5.8 6.2 0.228 0.244 e1.27 0.050 e3 7.62 0.300 f 3.8 4.0 0.149 0.157 g 4.6 5.3 0.181 0.208 l 0.5 1.27 0.019 0.050 m0.680.026 s 8 (max.) p013g so-14 mechanical data lm723 11/12
information furnished is believed to be accurate and reliable. however, stmicroe lectronics assumes no responsibi lity for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or pat ent rights of stm icroelectronics. specification mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previou sly supplied. stmicroele ctron ics products are not authorized for use as critical components in life support devices or systems without e xpress written approval of stmicroelectron ics. the st logo is a trademark of stmicroelectronics ? 1998 stmicroelectronics C printed in italy C all rights reserved stmicroelectronics group of comp anies australia - brazil - canada - china - france - germany - italy - japan - k orea - m alaysia - malta - mexico - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. . lm723 12/12

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