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1/17 june 2004 output current up to 1.5a output voltages of -5; -6; -8; -12; -15; -18; -20; -24v thermal overload protection short circuit protection output transition soa protection description the l7900 series of three-terminal negative regulators is available in to-220, to-220fp, to-3 and d 2 pak packages and several fixed output voltages, making it useful in a wide range of applications. these regulators can provide local on-card regulation, eliminating the distribution problems associated with single point regulation; furthermore, having the same voltage option as the l7800 positive standard series, they are particularly suited for split power supplies. if adequate heat sinking is provided, they can deliver over 1.5a output current. although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents. l7900 series negative voltage regulators schematic diagram to-220 d 2 pak to-220fp to-3 rev. 9
l7900 series 2/17 table 1: 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. table 2: thermal data figure 1: connection diagram (top view) symbol parameter value unit v i dc input voltage for v o = 5 to 18v -35 v for v o = 20, 24v -40 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 0 to 150 c symbol parameter d 2 pak to-220 to-220fp to-3 unit r thj-case thermal resistance junction-case max 3354c/w r thj-amb thermal resistance junction-ambient max 62.5506035c/w to-220 to-220fp to-3 d 2 pak
l7900 series 3/17 table 3: ordering codes (#) available in tape & reel with the suffix "-tr". (*) available on request. figure 2: test circuit table 4: electrical characteristics of l7905c (refer to the test circuits, t j = 0 to 125c, v i = -10v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified). (*) load and line regulation are specified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used. type to-220 (a type) to-220 (c type) d 2 pak (a type) (#) d 2 pak (c type) (t & r) to-220fp to-3 output voltage l7905c l7905cv l7905c-v l7905cd2t l7905c-d2tr l7905cp l7905ct (*) -5 v l7906c l7906cv l7906cd2t l7906cp (*) l7906ct (*) -6 v l7908c l7908cv l7908cd2t l7908cp (*) l7908ct (*) -8 v L7912C L7912Cv L7912C-v L7912Cd2t L7912Cp L7912Ct (*) -12 v l7915c l7915cv l7915cd2t l7915cp l7915ct -15 v l7918c l7918cv l7918cd2t(*) l7918cp (*) l7918ct (*) -18 v l7920c l7920cv l7920cd2t(*) l7920cp (*) l7920ct (*) -20 v l7924c l7924cv l7924cd2t(*) l7924cp (*) l7924ct -24 v symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -4.8 -5 -5.2 v v o output voltage i o = -5 ma to -1 a p o 15 w v i = 8 to 20 v -4.75-5-5.25 v ? v o (*) line regulation v i = -7 to -25 v t j = 25c 100 mv v i = -8 to -12 v t j = 25c 50 ? v o (*) load regulation i o = 5 ma to 1.5 a t j = 25c 100 mv i o = 250 to 750 ma t j = 25c 50 i d quiescent current t j = 25c 3 ma ? i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -8 to -25 v 1.3 ? v o / ? t output voltage drift i o = 5 ma -0.4 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 100 v svr supply voltage rejection ? v i = 10 v f = 120hz 54 60 db v d dropout voltage i o = 1 a t j = 25c ? v o = 100 mv 1.4 v i sc short circuit current 2.1 a
l7900 series 4/17 table 5: electrical characteristics of l7906c (refer to the test circuits, t j = 0 to 125c, v i = -11v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified). (*) load and line regulation are specified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used. table 6: electrical characteristics of l7908c (refer to the test circuits, t j = 0 to 125c, v i = -14v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified). (*) load and line regulation are specified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used. symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -5.75 -6 -6.25 v v o output voltage i o = -5 ma to -1 a p o 15 w v i = -9.5 to -21.5 v -5.7 -6 -6.3 v ? v o (*) line regulation v i = -8.5 to -25 v t j = 25c 120 mv v i = -9 to -15 v t j = 25c 60 ? v o (*) load regulation i o = 5 ma to 1.5 a t j = 25c 120 mv i o = 250 to 750 ma t j = 25c 60 i d quiescent current t j = 25c 3 ma ? i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -9.5 to -25 v 1.3 ? v o / ? t output voltage drift i o = 5 ma -0.6 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 144 v svr supply voltage rejection ? v i = 10 v f = 120hz 54 60 db v d dropout voltage i o = 1 a t j = 25c ? v o = 100 mv 1.4 v i sc short circuit current 2 a symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -7.7 -8 -8.3 v v o output voltage i o = -5 ma to -1 a p o 15 w v i = -11.5 to -23 v -7.6 -8 -8.4 v ? v o (*) line regulation v i = -10.5 to -25 v t j = 25c 160 mv v i = -11 to -17 v t j = 25c 80 ? v o (*) load regulation i o = 5 ma to 1.5 a t j = 25c 160 mv i o = 250 to 750 ma t j = 25c 80 i d quiescent current t j = 25c 3 ma ? i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -11.5 to -25 v 1 ? v o / ? t output voltage drift i o = 5 ma -0.6 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 175 v svr supply voltage rejection ? v i = 10 v f = 120hz 54 60 db v d dropout voltage i o = 1 a t j = 25c ? v o = 100 mv 1.1 v i sc short circuit current 1.5 a
l7900 series 5/17 table 7: electrical characteristics of L7912C (refer to the test circuits, t j = 0 to 125c, v i = -19v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified). (*) load and line regulation are specified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used. table 8: electrical characteristics of l7915c (refer to the test circuits, t j = 0 to 125c, v i = -23v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified). (*) load and line regulation are specified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used. symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -11.5 -12 -12.5 v v o output voltage i o = -5 ma to -1 a p o 15 w v i = -15.5 to -27 v -11.4 -12 -12.6 v ? v o (*) line regulation v i = -14.5 to -30 v t j = 25c 240 mv v i = -16 to -22 v t j = 25c 120 ? v o (*) load regulation i o = 5 ma to 1.5 a t j = 25c 240 mv i o = 250 to 750 ma t j = 25c 120 i d quiescent current t j = 25c 3 ma ? i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -15 to -30 v 1 ? v o / ? t output voltage drift i o = 5 ma -0.8 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 200 v svr supply voltage rejection ? v i = 10 v f = 120hz 54 60 db v d dropout voltage i o = 1 a t j = 25c ? v o = 100 mv 1.1 v i sc short circuit current 1.5 a symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -14.4 -15 -15.6 v v o output voltage i o = -5 ma to -1 a p o 15 w v i = -18.5 to -30 v -14.3 -15 -15.7 v ? v o (*) line regulation v i = -17.5 to -30 v t j = 25c 300 mv v i = -20 to -26 v t j = 25c 150 ? v o (*) load regulation i o = 5 ma to 1.5 a t j = 25c 300 mv i o = 250 to 750 ma t j = 25c 150 i d quiescent current t j = 25c 3 ma ? i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -18.5 to -30 v 1 ? v o / ? t output voltage drift i o = 5 ma -0.9 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 250 v svr supply voltage rejection ? v i = 10 v f = 120hz 54 60 db v d dropout voltage i o = 1 a t j = 25c ? v o = 100 mv 1.1 v i sc short circuit current 1.3 a
l7900 series 6/17 table 9: electrical characteristics of l7918c (refer to the test circuits, t j = 0 to 125c, v i = -27v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified). (*) load and line regulation are specified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used. table 10: electrical characteristics of l7920c (refer to the test circuits, t j = 0 to 125c, v i = -29v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified). (*) load and line regulation are specified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used. symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -17.3 -18 -18.7 v v o output voltage i o = -5 ma to -1 a p o 15 w v i = -22 to -33 v -17.1 -18 -18.9 v ? v o (*) line regulation v i = -21 to -33 v t j = 25c 360 mv v i = -24 to -30 v t j = 25c 180 ? v o (*) load regulation i o = 5 ma to 1.5 a t j = 25c 360 mv i o = 250 to 750 ma t j = 25c 180 i d quiescent current t j = 25c 3 ma ? i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -22 to -33 v 1 ? v o / ? t output voltage drift i o = 5 ma -1 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 300 v svr supply voltage rejection ? v i = 10 v f = 120hz 54 60 db v d dropout voltage i o = 1 a t j = 25c ? v o = 100 mv 1.1 v i sc short circuit current 1.1 a symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -19.2 -20 -20.8 v v o output voltage i o = -5 ma to -1 a p o 15 w v i = -24 to -35 v -19 -20 -21 v ? v o (*) line regulation v i = -23 to -35 v t j = 25c 400 mv v i = -26 to -32 v t j = 25c 200 ? v o (*) load regulation i o = 5 ma to 1.5 a t j = 25c 400 mv i o = 250 to 750 ma t j = 25c 200 i d quiescent current t j = 25c 3 ma ? i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -24 to -35 v 1 ? v o / ? t output voltage drift i o = 5 ma -1.1 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 350 v svr supply voltage rejection ? v i = 10 v f = 120hz 54 60 db v d dropout voltage i o = 1 a t j = 25c ? v o = 100 mv 1.1 v i sc short circuit current 0.9 a
l7900 series 7/17 table 11: electrical characteristics of l7924c (refer to the test circuits, t j = 0 to 125c, v i = -33v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified). (*) load and line regulation are specified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used. applications information figure 3: fixed output regulator note: 1. to specify an output voltage, substitute voltage value for "xx". 2. required for stability. for value given, capacitor must be solid tantalum. if aluminium electrolytics are used, at least ten times value should be selected. c1 is required if regulator is located an appreciable distance from power supply filter. 3. to improve transient response. if large capacitors are used, a high current diode from input to output (1n4001 or similar) s hould be intro- duced to protect the device from momentary input short circuit. symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -23 -24 -24.5 v v o output voltage i o = -5 ma to -1 a p o 15 w v i = -27 to -38 v -22.8 -24 -25.2 v ? v o (*) line regulation v i = -27 to -38 v t j = 25c 480 mv v i = -30 to -36 v t j = 25c 240 ? v o (*) load regulation i o = 5 ma to 1.5 a t j = 25c 480 mv i o = 250 to 750 ma t j = 25c 240 i d quiescent current t j = 25c 3 ma ? i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -27 to -38 v 1 ? v o / ? t output voltage drift i o = 5 ma -1 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 400 v svr supply voltage rejection ? v i = 10 v f = 120hz 54 60 db v d dropout voltage i o = 1 a t j = 25c ? v o = 100 mv 1.1 v i sc short circuit current 1.1 a
l7900 series 8/17 figure 4: split power supply ( 15v/1a) against potential latch-up problems. figure 5: circuit for increasing output voltage c3 optional for improved transient response and ripple rejection. figure 6: high current negative regulator (-5v/4a with 5a current limiting) r 1 + r 2 v o = v xx ???? r 2 v xx ??? > 3i d r 2
l7900 series 9/17 dim. mm. inch min. typ max. min. typ. max. a 11.85 0.466 b 0.96 1.05 1.10 0.037 0.041 0.043 c 1.70 0.066 d 8.7 0.342 e 20.0 0.787 g 10.9 0.429 n 16.9 0.665 p 26.2 1.031 r 3.88 4.09 0.152 0.161 u 39.5 1.555 v 30.10 1.185 to-3 mechanical data p003c/c e b r c d a p g n v u o
l7900 series 10/17 dim. mm. inch min. typ max. min. typ. max. a 4.40 4.60 0.173 0.181 b 0.61 0.88 0.024 0.034 b1 1.15 1.70 0.045 0.067 c 0.49 0.70 0.019 0.027 d 15.25 15.75 0.600 0.620 e 10.0 10.40 0.393 0.409 e 2.4 2.7 0.094 0.106 e1 4.95 5.15 0.194 0.203 f 1.23 1.32 0.048 0.051 h1 6.2 6.6 0.244 0.260 j1 2.40 2.72 0.094 0.107 l 13.0 14.0 0.511 0.551 l1 3.5 3.93 0.137 0.154 l20 16.4 0.645 l30 28.9 1.138 p 3.75 3.85 0.147 0.151 q 2.65 2.95 0.104 0.116 to-220 (a type) mechanical data 0015988/n
l7900 series 11/17 dim. mm. inch min. typ max. min. typ. max. a 4.30 4.70 0.169 0.185 b 0.70 0.90 0.028 0.035 b1 1.42 1.62 0.056 0.064 c 0.45 0.60 0.018 0.024 d 15.70 0.618 e 9.80 10.20 0.386 0.402 e 2.54 0.100 e1 5.08 0.200 f 1.25 1.39 0.049 0.055 h1 6.5 0.256 j1 2.20 2.60 0.087 0.202 l 12.88 13.28 0.507 0.523 l1 3 0.118 l20 15.70 16.1 0.618 0.634 l30 28.9 1.138 p 3.50 3.70 0.138 0.146 q 2.70 2.90 0.106 0.114 to-220 (c type) mechanical data 0015988/n
l7900 series 12/17 dim. mm. inch min. typ max. min. typ. max. a 4.40 4.60 0.173 0.181 b 2.5 2.7 0.098 0.106 d 2.5 2.75 0.098 0.108 e 0.45 0.70 0.017 0.027 f 0.75 1 0.030 0.039 f1 1.15 1.50 0.045 0.059 f2 1.15 1.50 0.045 0.059 g 4.95 5.2 0.194 0.204 g1 2.4 2.7 0.094 0.106 h 10.0 10.40 0.393 0.409 l2 16 0.630 l3 28.6 30.6 1.126 1.204 l4 9.8 10.6 0.385 0.417 l5 2.9 3.6 0.114 0.142 l6 15.9 16.4 0.626 0.645 l7 9 9.3 0.354 0.366 dia. 3 3.2 0.118 0.126 to-220fp mechanical data 7012510a-h
l7900 series 13/17 dim. mm. inch min. typ max. min. typ. max. a 4.4 4.6 0.173 0.181 a1 0.03 0.23 0.001 0.009 b 0.7 0.93 0.027 0.036 b2 1.14 1.7 0.044 0.067 c 0.45 0.6 0.017 0.023 c2 1.23 1.36 0.048 0.053 d 8.95 9.35 0.352 0.368 d1 8 0.315 e 10 10.4 0.393 0.409 e1 8.5 0.335 e 2.54 0.100 e1 4.88 5.28 0.192 0.208 h 15 15.85 0.590 0.624 j1 2.49 2.69 0.098 0.106 l 2.29 2.79 0.090 0.110 l1 1.27 1.4 0.050 0.055 l2 1.3 1.75 0.051 0.069 r 0.4 0.016 v2 0 8 0 8 d 2 pak (a type) mechanical data 0079457/j
l7900 series 14/17 dim. mm. inch min. typ max. min. typ. max. a 4.3 4.7 0.169 0.185 a1 0 0.20 0.000 0.008 b 0.70 0.90 0.028 0.035 b2 1.17 1.37 0.046 0.054 c 0.45 0.50 0.6 0.018 0.020 0.024 c2 1.25 1.30 1.40 0.049 0.051 0.055 d 9.0 9.2 9.4 0.354 0.362 0.370 d1 7.5 0.295 e 9.8 10.2 0.386 0.402 e1 7.5 0.295 e 2.54 0.100 e1 5.08 0.200 h 15 15.30 15.60 0.591 0.602 0.614 j1 2.20 2.60 0.087 0.102 l 1.79 2.79 0.070 0.110 l1 1.0 1.4 0.039 0.055 l2 1.2 1.6 0.047 0.063 r 0.3 0.012 v2 0 3 0 3 d 2 pak (c type) mechanical data 0079457/j
l7900 series 15/17 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 10.50 10.6 10.70 0.413 0.417 0.421 bo 15.70 15.80 15.90 0.618 0.622 0.626 ko 4.80 4.90 5.00 0.189 0.193 0.197 po 3.9 4.0 4.1 0.153 0.157 0.161 p 11.9 12.0 12.1 0.468 0.472 0.476 ta pe & reel d 2 pak-p 2 pak-d 2 pak/a-p 2 pak/a mechanical data
l7900 series 16/17 table 12: revision history date revision description of changes 22-jun-2004 9 ordering codes updated table 3, pag. 3.
l7900 series 17/17 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 all other names are the property of their respective owners ? 2004 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states. http://www.st.com

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