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l7900 series negative voltage regulators ? november 2000 n output current up to 1.5 a n output voltages of -5; -5.2; -6; -8; -9; -12; -15; -18; -20; -22; -24v n thermal overload protection n short circuit protection n 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. in addition, the -5.2v is also available for ecl system. 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. 1 2 to-3 to-220 to-220fp 1 3 d 2 pak schematic diagram 1/13
connection diagram and ordering numbers (top view) to-220 & to-220fp to-3 d 2 pak thermal data symbol parameter d 2 pak to-220 to-220fp to-3 unit r thj-case r thj-amb thermal resistance junction-case max thermal resistance junction-ambient max 3 62.5 3 50 5 60 4 35 o c/w o c/w type to-220 d 2 pak (*) to-220fp to-3 output voltage l7905c l7952c l7906c L7908C l7912c l7915c l7918c l7920c l7922c l7924c l7905cv l7952cv l7906cv L7908Cv l7912cv l7915cv l7918cv l7920cv l7922cv l7924cv l7905cd2t l7952cd2t l7906cd2t L7908Cd2t l7912cd2t l7915cd2t l7918cd2t l7920cd2t l7922cd2t l7924cd2t l7905cp l7906cp L7908Cp l7912cp l7915cp l7918cp l7920cp l7924cp l7905ct l7952ct l7906ct L7908Ct l7912ct l7915ct l7918ct l7920ct l7922ct l7924ct -5v -5.2v -6v -8v -12v -15v -18v -20v -22v -24v (*) available in tape and reel with o-tro suffix absolute maximum ratings symbol parameter value unit v i dc input voltage (for v o = 5 to 18v) (for v o = 20, 24v) -35 -40 v v i o output current internally limited p tot power dissipation internally limited t op operating junction temperature range 0 to 150 o c t stg storage temperature range - 65 to 150 o c application circuit l7900 2/13
* load and line regulation are specified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulce testing with low duty cycle is used. electrical characteristics for l7905c (refer to the test circuits, t j = 0 to 150 o c, v i = -10v, i o = 500 ma, c i = 2.2 m f, c o =1 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage t j =25 o c-4.8-5-5.2v v o output voltage i o =-5mato-1a p o 15 w v i = 8 to 20 v -4.75 -5 -5.25 v d v o * line regulation v i =-7to-25v t j =25 o c v i =-8to-12v t j =25 o c 100 50 mv mv d v o * load regulation i o = 5 to 1500 ma t j =25 o c i o = 250 to 750 ma t j =25 o c 100 50 mv mv i d quiescent current t j =25 o c3ma d i d quiescent current change i o = 5 to 1000 ma 0.5 ma d i d quiescent current change v i =-8to-25v 1.3 ma d v o d t output voltage drift i o = 5 ma -0.4 mv/ o c e n output noise voltage b = 10hz to 100khz t j =25 o c100 m v svr supply voltage rejection d v i = 10 v f = 120 hz 54 60 db v d dropout voltage i o =1a t j =25 o c d v o =100mv 1.4 v i sc short circuit current 2.1 a electrical characteristics for l7952c (refer to the test circuits, t j = 0 to 150 o c, v i = -10v, i o = 500 ma, c i = 2.2 m f, c o =1 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage t j =25 o c -5.0 -5.2 -5.4 v v o output voltage i o =-5mato-1a p o 15 w v i =-9to-21v -4.95 -5.2 -5.45 v d v o * line regulation v i =-8to-25v t j =25 o c v i =-9to-12v t j =25 o c 105 52 mv mv d v o * load regulation i o = 5 to 1500 ma t j =25 o c i o = 250 to 750 ma t j =25 o c 105 52 mv mv i d quiescent current t j =25 o c3ma d i d quiescent current change i o = 5 to 1000 ma 0.5 ma d i d quiescent current change v i =-9to-25v 1.3 ma d v o d t output voltage drift i o = 5 ma -0.5 mv/ o c e n output noise voltage b = 10hz to 100khz t j =25 o c125 m v svr supply voltage rejection d v i = 10 v f = 120 hz 54 60 db v d dropout voltage i o =1a t j =25 o c d v o =100mv 1.4 v i sc short circuit current 2 a l7900 3/13
* load and line regulation are specified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulce testing with low duty cycle is used. electrical characteristics for l7906c (refer to the test circuits, t j = 0 to 150 o c, v i = -11v, i o = 500 ma, c i = 2.2 m f, c o =1 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage t j =25 o c -5.75 -6 -6.25 v v o output voltage i o =-5mato-1a p o 15 w v i = -9.5 to -21.5 v -5.7 -6 -6.3 v d v o * line regulation v i = -8.5 to -25 v t j =25 o c v i =-9to-15v t j =25 o c 120 60 mv mv d v o * load regulation i o = 5 to 1500 ma t j =25 o c i o = 250 to 750 ma t j =25 o c 120 60 mv mv i d quiescent current t j =25 o c3ma d i d quiescent current change i o = 5 to 1000 ma 0.5 ma d i d quiescent current change v i = -9.5 to -25 v 1.3 ma d v o d t output voltage drift i o = 5 ma -0.6 mv/ o c e n output noise voltage b = 10hz to 100khz t j =25 o c144 m v svr supply voltage rejection d v i = 10 v f = 120 hz 54 60 db v d dropout voltage i o =1a t j =25 o c d v o =100mv 1.4 v i sc short circuit current 2 a electrical characteristics for L7908C (refer to the test circuits, t j = 0 to 150 o c, v i = -14v, i o = 500 ma, c i = 2.2 m f, c o =1 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage t j =25 o c-7.7-8-8.3v v o output voltage i o =-5mato-1a p o 15 w v i = -11.5 to -23 v -7.6 -8 -8.4 v d v o * line regulation v i = -10.5 to -25 v t j =25 o c v i = -11 to -17 v t j =25 o c 160 80 mv mv d v o * load regulation i o = 5 to 1500 ma t j =25 o c i o = 250 to 750 ma t j =25 o c 160 80 mv mv i d quiescent current t j =25 o c3ma d i d quiescent current change i o = 5 to 1000 ma 0.5 ma d i d quiescent current change v i = -11.5 to -25 v 1.3 ma d v o d t output voltage drift i o = 5 ma -0.6 mv/ o c e n output noise voltage b = 10hz to 100khz t j =25 o c175 m v svr supply voltage rejection d v i = 10 v f = 120 hz 54 60 db v d dropout voltage i o =1a t j =25 o c d v o =100mv 1.1 v i sc short circuit current 1.5 a l7900 4/13
* load and line regulation are specified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulce testing with low duty cycle is used. electrical characteristics for l7912c (refer to the test circuits, t j = 0 to 150 o c, v i = -19v, i o = 500 ma, c i = 2.2 m f, c o =1 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage t j =25 o c -11.5 -12 -12.5 v v o output voltage i o =-5mato-1a p o 15 w v i = -15.5 to -27 v -11.4 -12 -12.6 v d v o * line regulation v i = -14.5 to -30 v t j =25 o c v i = -16 to -22 v t j =25 o c 240 120 mv mv d v o * load regulation i o = 5 to 1500 ma t j =25 o c i o = 250 to 750 ma t j =25 o c 240 120 mv mv i d quiescent current t j =25 o c3ma d i d quiescent current change i o = 5 to 1000 ma 0.5 ma d i d quiescent current change v i = -15 to -30 v 1 ma d v o d t output voltage drift i o = 5 ma -0.8 mv/ o c e n output noise voltage b = 10hz to 100khz t j =25 o c200 m v svr supply voltage rejection d v i = 10 v f = 120 hz 54 60 db v d dropout voltage i o =1a t j =25 o c d v o =100mv 1.1 v i sc short circuit current 1.5 a electrical characteristics for l7915c (refer to the test circuits, t j = 0 to 150 o c, v i = -23v, i o = 500 ma, c i = 2.2 m f, c o =1 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage t j =25 o c -14.4 -15 -15.6 v v o output voltage i o =-5mato-1a p o 15 w v i = -18.5 to -30 v -14.3 -15 -15.7 v d v o * line regulation v i = -17.5 to -30 v t j =25 o c v i = -20 to -26 v t j =25 o c 300 150 mv mv d v o * load regulation i o = 5 to 1500 ma t j =25 o c i o = 250 to 750 ma t j =25 o c 300 150 mv mv i d quiescent current t j =25 o c3ma d i d quiescent current change i o = 5 to 1000 ma 0.5 ma d i d quiescent current change v i = -18.5 to -30 v 1 ma d v o d t output voltage drift i o = 5 ma -0.9 mv/ o c e n output noise voltage b = 10hz to 100khz t j =25 o c250 m v svr supply voltage rejection d v i = 10 v f = 120 hz 54 60 db v d dropout voltage i o =1a t j =25 o c d v o =100mv 1.1 v i sc short circuit current 1.3 a l7900 5/13
* load and line regulation are specified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulce testing with low duty cycle is used. electrical characteristics for l7918c (refer to the test circuits, t j = 0 to 150 o c, v i = -27v, i o = 500 ma, c i = 2.2 m f, c o =1 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage t j =25 o c -17.3 -18 -18.7 v v o output voltage i o =-5mato-1a p o 15 w v i = -22 to -33 v -17.1 -18 -18.9 v d v o * line regulation v i = -21 to -33 v t j =25 o c v i = -24 to -30 v t j =25 o c 360 180 mv mv d v o * load regulation i o = 5 to 1500 ma t j =25 o c i o = 250 to 750 ma t j =25 o c 360 180 mv mv i d quiescent current t j =25 o c3ma d i d quiescent current change i o = 5 to 1000 ma 0.5 ma d i d quiescent current change v i = -22 to -33 v 1 ma d v o d t output voltage drift i o = 5 ma -1 mv/ o c e n output noise voltage b = 10hz to 100khz t j =25 o c300 m v svr supply voltage rejection d v i = 10 v f = 120 hz 54 60 db v d dropout voltage i o =1a t j =25 o c d v o =100mv 1.1 v i sc short circuit current 1.1 a electrical characteristics for l7920c (refer to the test circuits, t j = 0 to 150 o c, v i = -29v, i o = 500 ma, c i = 2.2 m f, c o =1 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage t j =25 o c -19.2 -20 -20.8 v v o output voltage i o =-5mato-1a p o 15 w v i = -24 to -35 v -19 -20 -21 v d v o * line regulation v i = -23 to -35 v t j =25 o c v i = -26 to -32 v t j =25 o c 400 200 mv mv d v o * load regulation i o = 5 to 1500 ma t j =25 o c i o = 250 to 750 ma t j =25 o c 400 200 mv mv i d quiescent current t j =25 o c3ma d i d quiescent current change i o = 5 to 1000 ma 0.5 ma d i d quiescent current change v i = -24 to -35 v 1 ma d v o d t output voltage drift i o = 5 ma -1.1 mv/ o c e n output noise voltage b = 10hz to 100khz t j =25 o c350 m v svr supply voltage rejection d v i = 10 v f = 120 hz 54 60 db v d dropout voltage i o =1a t j =25 o c d v o =100mv 1.1 v i sc short circuit current 0.9 a l7900 6/13
* load and line regulation are specified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulce testing with low duty cycle is used. electrical characteristics for l7922c (refer to the test circuits, t j = 0 to 150 o c, v i = -31v, i o = 500 ma, c i = 2.2 m f, c o =1 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage t j =25 o c -21.1 -22 -22.9 v v o output voltage i o =-5mato-1a p o 15 w v i = -26 to -37 v -20.9 -22 -23.1 v d v o * line regulation v i = -25 to -37 v t j =25 o c v i = -28 to -34 v t j =25 o c 440 220 mv mv d v o * load regulation i o = 5 to 1500 ma t j =25 o c i o = 250 to 750 ma t j =25 o c 440 220 mv mv i d quiescent current t j =25 o c3ma d i d quiescent current change i o = 5 to 1000 ma 0.5 ma d i d quiescent current change v i = -26 to -37 v 1 ma d v o d t output voltage drift i o = 5 ma -1.1 mv/ o c e n output noise voltage b = 10hz to 100khz t j =25 o c375 m v svr supply voltage rejection d v i = 10 v f = 120 hz 54 60 db v d dropout voltage i o =1a t j =25 o c d v o =100mv 1.1 v i sc short circuit current 1.1 a electrical characteristics for l7924c (refer to the test circuits, t j = 0 to 150 o c, v i = -33v, i o = 500 ma, c i = 2.2 m f, c o =1 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage t j =25 o c -23 -24 -25 v v o output voltage i o =-5mato-1a p o 15 w v i = -27 to -38 v -22.8 -24 -25.2 v d v o * line regulation v i = -27 to -38 v t j =25 o c v i = -30 to -36 v t j =25 o c 480 240 mv mv d v o * load regulation i o = 5 to 1500 ma t j =25 o c i o = 250 to 750 ma t j =25 o c 480 240 mv mv i d quiescent current t j =25 o c3ma d i d quiescent current change i o = 5 to 1000 ma 0.5 ma d i d quiescent current change v i = -27 to -38 v 1 ma d v o d t output voltage drift i o = 5 ma -1 mv/ o c e n output noise voltage b = 10hz to 100khz t j =25 o c400 m v svr supply voltage rejection d v i = 10 v f = 120 hz 54 60 db v d dropout voltage i o =1a t j =25 o c d v o =100mv 1.1 v i sc short circuit current 1.1 a l7900 7/13
figure 1 : fixed output regulator. figure 2 : split power supply ( 15v/1a). notes : 1. to specify an output voltage, substitute voltage value for oxxo. 2. required for stability. for value given, capacitor must be solid tantalum. if aluminium electrolitics are used, at least ten times value should be selected. c 1 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) should be introduced to protect the device from momentary input short circuit. against potential latch-up problems. application information figure 3 : circuit for increasing output voltage. figure 4 : high current negative regulator ( 5v/4a with 5a current limiting). c3 optional for improved transient response and ripple rejection. figure 5 : typical ecl system power supply ( 5.2v/4a). optional dropping resistor to reduce the power dissipated in the boost transistor. v o = v xx r 1 + r 2 r 2 v xx r 2 > 3 i d l7900 8/13
dim. mm inch min. typ. max. min. typ. max. a 11.7 0.460 b 0.96 1.10 0.037 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 39.50 1.555 v 30.10 1.185 e b r c d a p g n v u o p003n to-3 (r) mechanical data l7900 9/13
dim. mm inch min. typ. max. min. typ. max. a 4.8 0.189 c 1.37 0.054 d 2.4 2.8 0.094 0.110 d1 1.2 1.35 0.047 0.053 e 0.35 0.55 0.014 0.022 f 0.61 0.94 0.024 0.037 f2 1.15 1.4 0.045 0.055 g 4.95 5.08 5.21 0.195 0.200 0.205 h2 10.4 0.409 h3 10.05 10.4 0.396 0.409 l2 16.2 0.638 l3 26.3 26.7 27.1 1.035 1.051 1.067 l5 2.6 3 0.102 0.118 l6 15.1 15.8 0.594 0.622 l7 6 6.6 0.236 0.260 dia. 3.65 3.85 0.144 0.152 p011d to-220 mechanical data l7900 10/13
dim. mm inch min. typ. max. min. typ. max. a 4.4 4.6 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 0.7 0.017 0.027 f 0.75 1 0.030 0.039 f1 1.15 1.7 0.045 0.067 f2 1.15 1.7 0.045 0.067 g 4.95 5.2 0.195 0.204 g1 2.4 2.7 0.094 0.106 h 10 10.4 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 l6 15.9 16.4 0.626 0.645 l7 9 9.3 0.354 0.366 3 3.2 0.118 0.126 l2 a b d e h g l6 ? f l3 g1 123 f2 f1 l7 l4 p011g4/b to-220fp mechanical data l7900 11/13
dim. mm inch min. typ. max. min. typ. max. a 4.4 4.6 0.173 0.181 a1 2.49 2.69 0.098 0.106 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 e 10 10.4 0.393 0.409 g 4.88 5.28 0.192 0.208 l 15 15.85 0.590 0.624 l2 1.27 1.4 0.050 0.055 l3 1.4 1.75 0.055 0.068 l2 l3 l b2 b g e a c2 d c a1 detailoao detailoao a2 p011p6/f to-263 (d 2 pak) mechanical data l7900 12/13
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 from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specification 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 withoutexpress written approval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics ? 2000 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 - u.s.a. http://www.st.com . l7900 13/13

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