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1/15 january 2003 n output current to 1.5a n output voltages of -5; -5.2; -6; -8; -12; -15; -18; -20; -22; -24v n thermal overload protection n short circuit protection n output transition soa protection description the l7900ac series of three-terminal negative regulators is available in to-220 and d 2 pak packages and several fixed output voltages. 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 l7800a 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. l7900ac series 2% negative voltage regulators schematic diagram to-220 d 2 pak
l7900ac series 2/15 absolute maximum ratings absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these condition is not implied. thermal data connection diagram (top view) ordering codes (*) available in tape & reel with the suffix "-tr". symbol parameter2 value unit v i dc input voltage for v o =-5to-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 125 c symbol parameter d 2 pa k to-220 unit r thj-case thermal resistance junction-case max 33c/w r thj-amb thermal resistance junction-ambient max 62.5 50 c/w type to-220 d 2 pak (*) output voltage l7905ac l7905acv l7905acd2t -5 v l7952ac l7952acv l7952acd2t -5.2 v l7906ac l7906acv l7906acd2t -6 v l7908ac l7908acv l7908acd2t -8 v l7912ac l7912acv l7912acd2t -12 v l7915ac L7915ACV l7915acd2t -15 v l7918ac l7918acv l7918acd2t -18 v l7920ac l7920acv l7920acd2t -20 v l7922ac l7922acv l7922acd2t -22 v l7924ac l7924acv l7924acd2t -24 v to-220 d 2 pak
l7900ac series 3/15 application circuits electrical characteristics of l7905a (refer to the test circuits, t j = 0 to 125c, v i = -10v, i o =500ma,c i =2.2f,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 -4.9 -5 -5.1 v v o output voltage i o =-5mato-1a p o 15w v i = 8 to 20 v -4.8 -5 -5.2 v d v o (*) line regulation v i =-7to-25v t j = 25c 100 mv v i =-8to-12v t j = 25c 50 d v o (*) load regulation i o =5mato1.5a t j = 25c 100 mv i o = 250 to 750 ma t j = 25c 50 i d quiescent current t j = 25c 3 ma d i d quiescent current change i o =5mato1a 0.5 ma v i = -8 to -25 v 1.3 d v o / d t output voltage drift i o = 5 ma -0.4 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 100 m v svr supply voltage rejection d v i = 10 v f = 120hz 54 60 db v d dropout voltage i o =1a t j = 25c d v o = 100 mv 1.4 v i sc short circuit current 2.1 a i scp short circuit peak current t j = 25c 2.5 a
l7900ac series 4/15 electrical characteristics of l7952a (refer to the test circuits, t j = 0 to 125c, v i = -10v, i o =500ma,c i =2.2f,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. electrical characteristics of l7906a (refer to the test circuits, t j = 0 to 125c, v i = -11v, i o =500ma,c i =2.2f,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 -5.1 -5.2 -5.3 v v o output voltage i o =-5mato-1a p o 15w v i = -9 to -21 v -5 -5.2 -5.4 v d v o (*) line regulation v i =-8to-25v t j = 25c 105 mv v i =-9to-13v t j = 25c 52 d v o (*) load regulation i o =5mato1.5a t j = 25c 105 mv i o = 250 to 750 ma t j = 25c 52 i d quiescent current t j = 25c 3 ma d i d quiescent current change i o =5mato1a 0.5 ma v i = -9 to -25 v 1.3 d v o / d t output voltage drift i o = 5 ma -0.5 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 125 m v svr supply voltage rejection d v i = 10 v f = 120hz 54 60 db v d dropout voltage i o =1a t j = 25c d v o = 100 mv 1.4 v i sc short circuit current 2.1 a i scp short circuit peak current t j = 25c 2.5 a symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -5.88 -6 -6.12 v v o output voltage i o =-5mato-1a p o 15w v i = -9.5 to -21.5 v -5.76 -6 -6.24 v d v o (*) line regulation v i = -8.5 to -25 v t j = 25c 120 mv v i =-9to-15v t j = 25c 60 d v o (*) load regulation i o =5mato1.5a t j = 25c 120 mv i o = 250 to 750 ma t j = 25c 60 i d quiescent current t j = 25c 3 ma d i d quiescent current change i o =5mato1a 0.5 ma v i = -9.5 to -25 v 1.3 d v o / d t output voltage drift i o = 5 ma -0.6 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 144 m v svr supply voltage rejection d v i = 10 v f = 120hz 54 60 db v d dropout voltage i o =1a t j = 25c d v o = 100 mv 1.4 v i sc short circuit current 2 a i scp short circuit peak current t j = 25c 2.5 a
l7900ac series 5/15 electrical characteristics of l7908a (refer to the test circuits, t j = 0 to 125c, v i = -14v, i o =500ma,c i =2.2f,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. electrical characteristics of l7912a (refer to the test circuits, t j = 0 to 125c, v i = -19v, i o =500ma,c i =2.2f,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 -7.84 -8 -8.16 v v o output voltage i o =-5mato-1a p o 15w v i = -11.5 to -23 v -7.68 -8 -8.32 v d 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 d v o (*) load regulation i o =5mato1.5a t j = 25c 160 mv i o = 250 to 750 ma t j = 25c 80 i d quiescent current t j = 25c 3 ma d i d quiescent current change i o =5mato1a 0.5 ma v i = -11.5 to -25 v 1 d v o / d t output voltage drift i o = 5 ma -0.6 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 175 m v svr supply voltage rejection d v i = 10 v f = 120hz 54 60 db v d dropout voltage i o =1a t j = 25c d v o = 100 mv 1.1 v i sc short circuit current 1.5 a i scp short circuit peak current t j = 25c 2.5 a symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -11.75 -12 -12.25 v v o output voltage i o =-5mato-1a p o 15w v i = -15.5 to -27 v -11.5 -12 -12.5 v d 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 d v o (*) load regulation i o =5mato1.5a t j = 25c 240 mv i o = 250 to 750 ma t j = 25c 120 i d quiescent current t j = 25c 3 ma d i d quiescent current change i o =5mato1a 0.5 ma v i = -15 to -25 v 1 d v o / d t output voltage drift i o = 5 ma -0.8 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 200 m v svr supply voltage rejection d v i = 10 v f = 120hz 54 60 db v d dropout voltage i o =1a t j = 25c d v o = 100 mv 1.1 v i sc short circuit current 1.5 a i scp short circuit peak current t j = 25c 2.5 a
l7900ac series 6/15 electrical characteristics of l7915a (refer to the test circuits, t j = 0 to 125c, v i = -23v, i o =500ma,c i =2.2f,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. electrical characteristics of l7918a (refer to the test circuits, t j = 0 to 125c, v i = -27v, i o =500ma,c i =2.2f,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 -14.7 -15 -15.3 v v o output voltage i o =-5mato-1a p o 15w v i = -18.5 to -30 v -14.4 -15 -15.6 v d 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 d v o (*) load regulation i o =5mato1.5a t j = 25c 300 mv i o = 250 to 750 ma t j = 25c 150 i d quiescent current t j = 25c 3 ma d i d quiescent current change i o =5mato1a 0.5 ma v i = -18.5 to -30 v 1 d v o / d t output voltage drift i o = 5 ma -0.9 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 250 m v svr supply voltage rejection d v i = 10 v f = 120hz 54 60 db v d dropout voltage i o =1a t j = 25c d v o = 100 mv 1.1 v i sc short circuit current 1.3 a i scp short circuit peak current t j = 25c 2.3 a symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -17.64 -18 -18.36 v v o output voltage i o =-5mato-1a p o 15w v i = -22 to -33 v -17.3 -18 -18.7 v d 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 d v o (*) load regulation i o =5mato1.5a t j = 25c 360 mv i o = 250 to 750 ma t j = 25c 180 i d quiescent current t j = 25c 3 ma d i d quiescent current change i o =5mato1a 0.5 ma v i = -22 to -33 v 1 d v o / d t output voltage drift i o = 5 ma -1 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 300 m v svr supply voltage rejection d v i = 10 v f = 120hz 54 60 db v d dropout voltage i o =1a t j = 25c d v o = 100 mv 1.1 v i sc short circuit current 1.1 a i scp short circuit peak current t j = 25c 2.2 a
l7900ac series 7/15 electrical characteristics of l7920a (refer to the test circuits, t j = 0 to 125c, v i = -29v, i o =500ma,c i =2.2f,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. electrical characteristics of l7922a (refer to the test circuits, t j = 0 to 125c, v i = -31v, i o =500ma,c i =2.2f,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 -19.6 -20 -20.4 v v o output voltage i o =-5mato-1a p o 15w v i = -24 to -35 v -19.2 -20 -20.8 v d 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 d v o (*) load regulation i o =5mato1.5a t j = 25c 400 mv i o = 250 to 750 ma t j = 25c 200 i d quiescent current t j = 25c 3 ma d i d quiescent current change i o =5mato1a 0.5 ma v i = -24 to -35 v 1 d v o / d t output voltage drift i o = 5 ma -1.1 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 350 m v svr supply voltage rejection d v i = 10 v f = 120hz 54 60 db v d dropout voltage i o =1a t j = 25c d v o = 100 mv 1.1 v i sc short circuit current 0.9 a i scp short circuit peak current t j = 25c 2.2 a symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -21.5 -22 -22.4 v v o output voltage i o =-5mato-1a p o 15w v i = -26 to -37 v -21.1 -22 -22.8 v d v o (*) line regulation v i = -25 to -37 v t j = 25c 440 mv v i = -28 to -34 v t j = 25c 220 d v o (*) load regulation i o =5mato1.5a t j = 25c 440 mv i o = 250 to 750 ma t j = 25c 220 i d quiescent current t j = 25c 3 ma d i d quiescent current change i o =5mato1a 0.5 ma v i = -26 to -37 v 1 d v o / d t output voltage drift i o = 5 ma -1.1 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 375 m v svr supply voltage rejection d v i = 10 v f = 120hz 54 60 db v d dropout voltage i o =1a t j = 25c d v o = 100 mv 1.1 v i sc short circuit current 1.1 a i scp short circuit peak current t j = 25c 2.2 a
l7900ac series 8/15 electrical characteristics of l7924a (refer to the test circuits, t j = 0 to 125c, v i = -33v, i o =500ma,c i =2.2f,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 -23.5 -24 -24.5 v v o output voltage i o =-5mato-1a p o 15w v i = -27 to -38 v -23 -24 -25 v d 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 d v o (*) load regulation i o =5mato1.5a t j = 25c 480 mv i o = 250 to 750 ma t j = 25c 240 i d quiescent current t j = 25c 3 ma d i d quiescent current change i o =5mato1a 0.5 ma v i = -27 to -38 v 1 d v o / d t output voltage drift i o = 5 ma -1 mv/c en output noise voltage b = 10hz to 100khz t j = 25c 400 m v svr supply voltage rejection d v i = 10 v f = 120hz 54 60 db v d dropout voltage i o =1a t j = 25c d v o = 100 mv 1.1 v i sc short circuit current 1.1 a i scp short circuit peak current t j = 25c 2.2 a
l7900ac series 9/15 applications information figure 1 : 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) should be intro- duced to protect the device from momentary input short circuit. figure 2 : split power supply ( 15v/1a) against potential latch-up problems. figure 3 : circuit for increasing output voltage c3 optional for improved transient response and ripple rejection. r 1+ r 2 v o =v xx ???? r 2 v xx ??? > 3i d r 2
l7900ac series 10/15 figure 4 : high current negative regulator (-5v/4a with 5a current limiting) figure 5 : typical ecl system power supply (-5.2v/4a) optional dropping resistor to reduce the power dissipated in the boost transistor.
l7900ac series 11/15 dim. mm. inch min. typ max. min. typ. max. a 4.40 4.60 0.173 0.181 c 1.23 1.32 0.048 0.051 d 2.40 2.72 0.094 0.107 d1 1.27 0.050 e 0.49 0.70 0.019 0.027 f 0.61 0.88 0.024 0.034 f1 1.14 1.70 0.044 0.067 f2 1.14 1.70 0.044 0.067 g 4.95 5.15 0.194 0.203 g1 2.4 2.7 0.094 0.106 h2 10.0 10.40 0.393 0.409 l2 16.4 0.645 l4 13.0 14.0 0.511 0.551 l5 2.65 2.95 0.104 0.116 l6 15.25 15.75 0.600 0.620 l7 6.2 6.6 0.244 0.260 l9 3.5 3.93 0.137 0.154 dia. 3.75 3.85 0.147 0.151 to-220 mechanical dat a p011c
l7900ac series 12/15 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 a2 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 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 m 2.4 3.2 0.094 0.126 r 0.4 0.016 v2 0? 8? 0? 8? d 2 pak mec hanical data p011p6g
l7900ac series 13/15 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 tape & reel d 2 pak-p 2 pak-d 2 pak/a-p 2 pak/a mechanical data
l7900ac series 14/15 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 ? 2003 stmicroelectronics - printed in italy - all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia - malt a - morocco singapore - spain - sweden - switzerland - united kingdom - united states. ? http://www.st.com
l7900ac series 15/15

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