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november 2007 rev 6 1/21 21 lm723 high precision voltage regulator features input voltage up to 40 v output voltage adjustable from 2 to 37 v positive or negative supply operation series, shunt, switching or floating operation output current to 150 ma without external pass transistor adjustable current limiting description the lm723 is a monolithic integrated programmable voltage regulator, assembled in 14-lead dual in-line plastic package. the circuit provides internal current limiting. when the output current exceeds 150 ma an external npn or pnp pass element may be used. provisions are made for adjustable current limiting and remote shut- down. dip-14 table 1. device summary order code package lm723n dip-14 lm723cn dip-14 www.st.com
contents lm723 2/21 contents 1 diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
lm723 diagram 3/21 1 diagram figure 1. schematic diagram
pin configuration lm723 4/21 2 pin configuration figure 2. pin connections (top view)
lm723 maximum ratings 5/21 3 maximum ratings table 2. absolute maximum ratings symbol parameter value unit lm723 lm723c v i dc input voltage 40 40 v v i-o dropout voltage 40 40 v i o output current 150 150 ma i ref current from v ref 15 25 ma t op operating temperature -55 to 125 0 to 70 c t stg storage temperature -65 to 150 -65 to 150 c t j junction temperature 150 125 c table 3. thermal data symbol parameter dip14 unit r thja thermal resistance junction-ambient max 200 c/w
circuit lm723 6/21 4 circuit note: v i = 12 v; v o = 5 v; i o = 1 ma; r 1 /r 2 10 k figure 3. test circuit (pin configuration relative to the plastic package)
lm723 electrical characteristics 7/21 5 electrical characteristics table 4. electrical characteristics for lm723 (refer to the test circuits, t a = 25 c, unless otherwise specified.) symbol parameter test conditions min. typ. max. unit v o / v i line regulation v i = 12 to 15 v 0.01 0.1 % v i = 12 to 40 v 0.02 0.2 v i = 12 to 15 v, t a = -55 to 125c 0.3 v o /v o load regulation i o = 1 to 50 ma 0.03 0.15 % i o = 1 to 10 ma, t a = -55 to 125c 0.6 v ref reference voltage i ref = 160 a 6.95 7.15 7.35 v svr supply voltage rejection f = 100 hz to 10khz c ref = 0 74 db c ref = 5f 86 v o / t output voltage drift 150 ppm/c i sc output current limit r sc = 10 , v o = 0 v 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 = 30v, i o = 0 ma 2.3 5 ma k vh long term stability 0.1 %/1000 hrs en output noise voltage bw = 100 hz to 10 khz c ref = 0 20 v c ref = 5f 2.5
electrical characteristics lm723 8/21 table 5. electrical characteristics for lm723c (refer to the test circuits, t a = 25 c, unless otherwise specified.) symbol parameter test conditions min. typ. max. unit v o / v i line regulation v i = 12 to 15 v 0.01 0.1 % v i = 12 to 40 v 0.1 0.5 v i = 12 to 15 v, t a = 0 to 70c 0.3 v o /v o load regulation i o = 1 to 50 ma 0.03 0.2 % i o = 1 to 10 ma, t a = 0 to 70c 0.6 v ref reference voltage i ref = 160 a 6.8 7.15 7.5 v svr supply voltage rejection f = 100 hz to 10khz c ref = 0 74 db c ref = 5f 86 v o / t output voltage drift 150 ppm/c i sc output current limit r sc = 10 , v o = 0 v 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 = 30v, i o = 0 ma 2.3 4 ma k vh long term stability 0.1 %/1000 hrs en output noise voltage bw = 100 hz to 10 khz c ref = 0 20 v c ref = 5f 2.5
lm723 typical performance characteristics 9/21 6 t ypical performance characteristics (unless otherwise specified v o(nom) = 3.3 v) figure 4. maximum output current vs voltage drop figure 5. current limiting characteristics figure 6. current limiting characteristics vs junction temperature figure 7. load regulation characteristics without current limiting figure 8. load regulation characteristics with current limiting figure 9. load regulation characteristics with current limiting
typical performance characteristics lm723 10/21 figure 10. line regulation vs voltage drop figure 11. load regulation vs voltage drop figure 12. quiescent drain current vs input voltage figure 13. line transient response figure 14. load transient response figure 15. output impedance vs frequency
lm723 typical performance characteristics 11/21 table 6. resistor values (k ) for standard output voltages output voltag e applicable figures fixed output 5% output adjustable 10% (1) r1 r2 r1 p1 r2 +3 16 , 18 , 20 , 21 , 24 , 26 4.12 3.01 1.8 0.5 1.2 +5 16 , 18 , 20 , 21 , 24 , 26 2.15 4.99 0.75 0.5 2.2 +6 16 , 18 , 20 , 21 , 24 , 26 1.15 6.04 0.5 0.5 2.7 +9 17 , 18 , 20 , 21 , 24 , 26 1.87 7.15 0.75 1 2.7 +12 17 , 18 , 20 , 21 , 24 , 26 4.87 7.15 2 1 3 +15 17 , 18 , 20 , 21 , 24 , 26 7.87 7.15 3.3 1 3 +28 17 , 18 , 20 , 21 , 24 , 26 21 7.15 5.6 1 2 +45 22 3.57 48.7 2.2 10 39 +75 22 3.57 78.7 2.2 10 68 +100 22 3.57 102 2.2 10 91 +250 22 3.57 255 2.2 10 240 -6 (2) 18 3.57 2.43 1.2 0.5 0.75 -9 18 3.48 5.36 1.2 0.5 2 -12 18 3.57 8.45 1.2 0.5 3.3 -15 18 3.65 11.5 1.2 0.5 4.3 -28 18 3.57 24.3 1.2 0.5 10 -45 23 3.57 21.2 2.2 10 33 -100 23 3.57 97.6 2.2 10 91 -250 23 3.57 249 2.2 10 240 1. replace r1/r2 divider with the circuit of figure 27 . 2. v+ must be connected to a +3 v or greater supply. table 7. formula for intermediate output voltages conditions outputs from 2 to 7v figure 16 , 19 , 20 , 21 , 24 , 26 v o = ( v ref xr 2 ) /(r 1 +r 2 ) outputs from 4 to 250v figure 22 v o = ( v ref /2)x [ (r 2 -r 1 )/r 1 ]; r 3 =r 4 current limit i limit =v sense /r sc outputs from 7 to 37v figure 17 , 19 , 20 , 21 , 24 , 26 v o =v ref x [ (r 1 +r 2 )/r 2 ] outputs from -6 to -250v figure 18 , figure 23 v o = ( v ref /2)x [ (r 1 +r 2 )/r 1 ]; r 3 =r 4 foldback current limiting i knee = [( v o xr 3 )/(r sc xr 4 ) ] x [ v sense x(r 3 +r 4 ) ] / (r sc xr 4 ) i shortckt = ( v sense /r sc )x [ (r 3 +r 4 )/r 4 ]
applications information lm723 12/21 7 applications information note: r 3 = (r 1 xr 2 )/(r 1 +r 2 ) for minimum temperature drift. r 3 may be eliminated for minimum component count. typical performance regulated output voltage..................5 v line regulation ( v i = 3 v)..........0.5 mv load regulation ( i o = 50 ma)...1.5 mv note: r 3 = (r 1 xr 2 )/(r 1 +r 2 ) for minimum temperature drift. r 3 may be eliminated for minimum component count. typical performance regulated output voltage..................15 v line regulation ( v i = 3 v)............1.5 mv load regulation ( i o = 50 ma).....4.5 mv figure 16. basic low voltage regulator (v o = 2 to 7 v) figure 17. basic high voltage regulator (v o = 7 to 37 v)
lm723 applications information 13/21 note: typical performance regulated output voltage.................15 v line regulation ( v i = 3 v)...............1 mv load regulation ( i o = 100 ma)......2 mv note: typical performance regulated output voltage................15 v line regulation ( v i = 3 v)...........1.5 mv load regulation ( i o = 1 a)...........15 mv figure 18. negative voltage regulator figure 19. positive voltage regulator (external npn pass transistor)
applications information lm723 14/21 note: typical performance regulated output voltage...................5 v line regulation ( v i = 3 v)...........0.5 mv load regulation ( i o = 1 a)..........1.5 mv note: typical performance regulated output voltage....................5 v line regulation ( v i = 3 v)............0.5 mv load regulation ( i o = 10 ma)........1 mv current limit knee...........................20 ma figure 20. positive voltage regulator (external pnp pass transistor) figure 21. foldback current limiting
lm723 applications information 15/21 note: typical performance regulated output voltage....................100 v line regulation ( v i = 20 v)...............15 mv load regulation ( i o = 50 ma)..........20 mv note: typical performance regulated output voltage....................-100 v line regulation ( v i = 20 v).................30 mv load regulation ( i o = 100 ma)..........20 mv figure 22. positive floating regulator figure 23. negative floating regulator
applications information lm723 16/21 note: typical performance regulated output voltage....................5 v line regulation ( v i = 30 v)...........10 mv load regulation ( i o = 2 a)............80 mv note: current limit transistor may be used for shutdown if current limiting is not required. typical performance regulated output voltage...........................5 v line regulation ( v i = 3 v)...................0.5 mv load regulation ( i o = 50 ma)............1.5 mv figure 24. positive switching regulator figure 25. remote shutdown regulator with current limiting
lm723 applications information 17/21 note: typical performance regulated output voltage............................5 v line regulation ( v i = 10 v).....................2 mv load regulation ( i o = 100 ma)..............5 mv figure 26. shunt regulator figure 27. output voltage adjust
package mechanical data lm723 18/21 8 p ackage mechanical data in order to meet environmental requirements, st offers these devices in ecopack ? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com.
lm723 package mechanical data 19/21 dim. mm. inch. min. typ. max. min. typ. max. a 1 0.51 0.020 b1. 39 1.65 0.055 0.065 b 0.5 0.020 b 1 0.25 0.010 d200.7 8 7 e 8 .5 0. 33 5 e 2.54 0.100 e 3 15.24 0.600 f 7.1 0.2 8 0 i 5.1 0.201 l 3 . 3 0.1 3 0 z 1.27 2.54 0.050 0.100 pla s tic dip-14 mechanical data p001a
revision history lm723 20/21 9 revision history table 8. document revision history date revision changes 21-jun-2004 5 22-nov-2007 6 added ta b l e 1 .
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