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lm79xx/a (ka79xx, mc79xx ) fixed voltage regulator (negative) 3-terminal 1a negative voltage regulators the lm79xx series of three-terminal negative regulators are available in to-220 package and with several fixed output voltages, making them useful in a wide range of applications. each type employs internal current limiting, thermal shut-down and safe area protection, making it essentially indestructible. features output current in excess of 1a output voltages of -5, -6, -8, -12, -15, -18, -24v internal thermal overload protection short circuit protection output transistor safe-area compensation lm79xx ct 4% lm79xxa t 2% voltage reference + - protection circuitry r1 r2 rsc gnd i1 i2 out in q1 q2 to-220 1: gnd 2: input 3: output device operating temperature package 0 ~ +125 c output voltage tolerance to-220 ordering information block diagram ? 1999 fairchild semiconductor corporation rev. b
lm79xx/a (ka79xx, mc79xx ) fixed voltage regulator (negative) absolute maximum ratings (t a =+25 c, unless otherwise specified) lm7905 electrical characteristics (v i = 10v, l o = 500ma, 0 c t j + 125 c, c i =2.2 m f, c o =1 m 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 is used. characteristic symbol value unit input voltage v i -35 v thermal resistance junction-cases junction-air r q jc r q ja 5 65 c / w c /w operating temperature range t opr 0 ~ +125 c storage temperature range t stg - 65 ~ +150 c characteristic symbol test conditions min typ max unit t j =+25 c - 4.8 - 5.0 - 5.2 output voltage v o i o = 5ma to 1a, p o 15w v i = -7 to -20v - 4.75 -5.0 - 5.25 v v i = -7 to -20v i o =1a 5 50 v i = -8 to -12v i o =1a 2 25 v i = -7.5 to -25v 7 50 v i = -8 to -12v i o =1a 7 50 i o = 5ma to 1.5a 10 100 t j =+25 c i o = 250 to 750ma 3 50 quiescent current i q t j =+25 c 3 6 ma i o = 5ma to 1a 0.05 0.5 v i = -8 to -25v 0.1 0.8 temperature coefficient of v d d v o / d t i o = 5ma - 0.4 mv/ c output noise voltage v n f = 10hz to 100khz t a =+25 c 40 m v ripple rejection rr f = 120hz, i o = -35v d v i = 10v 54 60 db dropout voltage v d t j =+25 c i o = 1a 2 v short circuit current i sc t j =+25 c, v i = -35v 300 ma peak current i pk t j =+25 c 2.2 a load regulation d v o line regulation d v o t j =25 c mv mv quiescent current change d i q ma
lm79xx/a (ka79xx, mc79xx ) fixed voltage regulator (negative) lm7906 electrical characteristics (v i = 11v, l o = 500ma, 0 c t j + 125 c, c i =2.2 m f, c o = 1 m 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 is used. characteristic symbol test conditions min typ max unit t j = +25 c - 5.75 - 6 - 6.25 output voltage v o i o = 5ma to 1a, p o 15w v i = - 9 to - 21v - 5.7 - 6 - 6.3 v v i = - 8 to - 25v 10 120 v i = - 9 to -12v 5 60 t j =+ 25 c i o = 5ma to 1.5a 10 120 t j =+ 25 c i o = 250 to 750ma 3 60 quiescent current i q t j =+ 25 c 3 6 ma i o = 5ma to 1a 0.5 v i = -9 to -25v 1.3 temperature coefficient of v d d v o / d t i o = 5ma -0.5 mv/ c output noise voltage v n f = 10hz to 100khz t a =+ 25 c 130 m v ripple rejection rr f = 120hz d v i = 10v 54 60 db dropout voltage v d t j =+ 25 c i o = 1a 2 v short circuit current i sc t j = +25 c, v i = -35v 300 ma peak current i pk t j = +25 c 2.2 a line regulation d v o t j = 25 c d v o load regulation mv mv quiescent current change d i q ma
lm79xx/a (ka79xx, mc79xx ) fixed voltage regulator (negative) lm7908 electrical characteristics (v i = 14v, l o = 500ma, 0 c t j + 125 c, c i =2.2 m f, c o = 1 m 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 i nto account separately. pulse testing with low duty is used. characteristic symbol test conditions min typ max unit t j =+ 25 c - 7.7 - 8 - 8.3 output voltage v o i o = 5ma to 1a, p o 15w v i = -1.5 to -23v - 7.6 - 8 - 8.4 v v i = -10.5 to -25v 10 100 v i = -11 to -17v 5 80 t j =+ 25 c i o = 5ma to 1.5a 12 160 t j =+ 25 c i o = 250 to 750ma 4 80 quiescent current i q t j =+ 25 c 3 6 ma i o = 5ma to 1a 0.05 0.5 v i = -11.5 to -25v 0.1 1 temperature coefficient of v d d v o / d t i o = 5ma -0.6 mv/ c output noise voltage v n f = 10hz to 100khz t a =+ 25 c 175 m v ripple rejection rr f = 120hz d v i = 10v 54 60 db dropout voltage v d t j =+ 25 c i o = 1a 2 v short circuit current i sc t j =+ 25 c, v i = -35v 300 ma peak current i pk t j =+ 25 c 2.2 a line regulation d v o load regulation d v o mv mv t j = 25 c quiescent current change d i q ma
lm79xx/a (ka79xx, mc79xx ) fixed voltage regulator (negative) lm7909 electrical characteristics (v i = 14v, l o = 500ma, 0 c t j + 125 c, c i =2.2 m f, c o = 1 m 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 is used. characteristic symbol test conditions min typ max unit t j =+ 25 c - 8.7 - 9.0 - 9.3 output voltage v o i o = 5ma to 1a, p o 15w v i = -1.5 to -23v - 8.6 - 9.0 - 9.4 v v i = -10.5 to -25v 10 180 v i = -11 to -17v 5 90 t j =+ 25 c i o = 5ma to 1.5a 12 180 t j =+ 25 c i o = 250 to 750ma 4 90 quiescent current i q t j =+ 25 c 3 6 ma i o = 5ma to 1a 0.05 0.5 v i = -11.5 to -25v 0.1 1 temperature coefficient of v d d v o / d t i o = 5ma -0.6 mv/ c output noise voltage v n f = 10hz to 100khz t a =+ 25 c 175 m v ripple rejection rr f = 120hz d v i = 10v 54 60 db dropout voltage v d t j =+ 25 c i o = 1a 2 v short circuit current i sc t j = +25 c, v i = -35v 300 ma peak current i pk t j =+25 c 2.2 a line regulation d v o load regulation d v o mv mv t j = 25 c quiescent current change d i q ma
lm79xx/a (ka79xx, mc79xx ) fixed voltage regulator (negative) lm7912 electrical characteristics (v i = 18v, l o =500ma, 0 c t j + 125 c, c i =2.2 m f, c o = 1 m 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 is used. characteristic symbol test conditions min typ max unit t j = +25 c -11.5 -12 -12.5 output voltage v o i o = 5ma to 1a, p o 15w v i = -15.5 to -27v -11.4 -12 -12.6 v v i = -14.5 to -30v 12 240 v i = -16 to -22v 6 120 t j =+ 25 c i o = 5ma to 1.5a 12 240 t j =+ 25 c i o = 250 to 750ma 4 120 quiescent current i q t j =+ 25 c 3 6 ma i o = 5ma to 1a 0.05 0.5 v i = -15 to -30v 0.1 1 temperature coefficient of v d d v o / d t i o = 5ma -0.8 mv/ c output noise voltage v n f = 10hz to 100khz t a =+ 25 c 200 m v ripple rejection rr f = 120hz d v i = 10v 54 60 db dropout voltage v d t j = +25 c i o = 1a 2 v short circuit current i sc t j =+ 25 c, v i = -35v 300 ma peak current i pk t j =+ 25 c 2.2 a line regulation load regulation d v o d v o mv t j = 25 c mv quiescent current change d i q ma
lm79xx/a (ka79xx, mc79xx ) fixed voltage regulator (negative) lm7915 electrical characteristics (v i = 23v, i o = 500ma, 0 c t j +125 c, c i =2.2 m f, c o = 1 m 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 is used. characteristic symbol test conditions min typ max unit t j =+ 25 c -14.4 -15 -15.6 output voltage v o i o = 5ma to 1a, p o 15w v i = -18 to -30v -14.25 -15 -15.75 v v i = -17.5 to -30v 12 300 v i = -20 to -26v 6 150 t j =+ 25 c i o = 5ma to 1.5a 12 300 t j =+ 25 c i o = 250 to 750ma 4 150 quiescent current i q t j =+ 25 c 3 6 ma i o = 5ma to 1a 0.05 0.5 v i = -18.5 to -30v 0.1 1 temperature coefficient of v d d v o / d t i o = 5ma -0.9 mv/ c output noise voltage v n f = 10hz to 100khz t a =+ 25 c 250 m v ripple rejection rr f = 120hz d v i = 10v 54 60 db dropout voltage v d t j =+25 c i o = 1a 2 v short circuit current i sc t j =+ 25 c, v i = -35v 300 ma peak current i pk t j =+ 25 c 2.2 a line regulation d v o load regulation d v o t j = 25 c quiescent current change d i q mv mv ma
lm79xx/a (ka79xx, mc79xx ) fixed voltage regulator (negative) lm7918 electrical characteristics (v i = 27v, l o = 500ma, 0 c t j + 125 c, c i =2.2 m f, c o = 1 m 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 is used. characteristic symbol test conditions min typ max unit t j =+ 25 c -17.3 -18 -18.7 output voltage v o i o = 5ma to 1a, p o 15w v i = -22.5 to -33v -17.1 -18 -18.9 v v i = -21 to -33v 15 360 v i = -24 to -30v 8 180 t j =+ 25 c i o = 5ma to 1.5a 15 360 t j =+ 25 c i o = 250 to 750ma 5 180 quiescent current i q t j =+ 25 c 3 6 ma i o = 5ma to 1a 0.5 v i = -22 to -33v 1 temperature coefficient of v d d v o / d t i o = 5ma -1 mv/ c output noise voltage v n f = 10hz to 100khz t a =+ 25 c 300 m v ripple rejection rr f = 120hz d v i = 10v 54 60 db dropout voltage v d t j =+ 25 c i o = 1a 2 v short circuit current i sc t j =+ 25 c, v i = -35v 300 ma peak current i pk t j =+ 25 c 2.2 a quiescent current change d i q line regulation d v o load regulation d v o t j = 25 c mv mv ma
lm79xx/a (ka79xx, mc79xx ) fixed voltage regulator (negative) lm7924 electrical characteristics (v i = 33v, l o = 500ma, 0 c t j + 125 c, c i =2.2 m f, c o = 1 m 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 is used. characteristic symbol test conditions min typ max unit t j =+25 c - 23 - 24 - 25 output voltage v o i o = 5ma to 1a, p o 15w v i = -27 to -38v - 22.8 - 24 - 25.2 v v i = - 27 to - 38v 15 480 v i = - 30 to - 36v 8 180 t j = +25 c i o = 5ma to 1.5a 15 480 t j =+ 25 c i o = 250 to 750ma 5 240 quiescent current i q t j =+ 25 c 3 6 ma i o = 5ma to 1a 0.5 v i = -27 to -38v 1 temperature coefficient of v d d v o / d t i o = 5ma -1 mv/ c output noise voltage v n f = 10hz to 100khz t a =+ 25 c 400 m v ripple rejection rr f = 120hz d v i = 10v 54 60 db dropout voltage v d t j = +25 c i o = 1a 2 v short circuit current i sc t j =+ 25 c, v i = -35v 300 ma peak current i pk t j =+25 c 2.2 a line regulation load regulation t j = 25 c d v o d v o quiescent current change d i q ma mv mv
lm79xx/a (ka79xx, mc79xx ) fixed voltage regulator (negative) lm7905a electrical characteristics (v i = 10v, l o = 500ma, 0 c t j + 125 c, c i =2.2 m f, c o =1 m 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 is used. lm 7912a electrical characteristics characteristic symbol test conditions min typ max unit t j =+ 25 c - 4.9 - 5.0 - 5.1 output voltage v o i o = 5ma to 1a, p o 15w v i = -7 to -20v - 4.8 -5.0 - 5.2 v v i = -7 to -20v i o =1a 5 50 v i = -8 to -12v i o =1a 2 25 v i = -7.5 to -25v 7 50 v i = -8 to -12v i o =1a 7 50 i o = 5ma to 1.5a 10 100 t j =+ 25 c i o = 250 to 750ma 3 50 quiescent current i q t j = +25 c 3 6 ma i o = 5ma to 1a 0.05 0.5 v i = -8 to -25v 0.1 0.8 temperature coefficient of v d d v o / d t i o = 5ma - 0.4 mv/ c output noise voltage v n f = 10hz to 100khz t a =+ 25 c 40 m v ripple rejection rr f = 120hz, i o = -35v d v i = 10v 54 60 db dropout voltage v d t j =+ 25 c i o = 1a 2 v short circuit current i sc t j =+ 25 c, v i = -35v 300 ma peak current i pk t j =+ 25 c 2.2 a load regulation d v o line regulation d v o t j =+25 c mv mv quiescent current change d i q ma
lm79xx/a (ka79xx, mc79xx ) fixed voltage regulator (negative) (v i = 18v, l o =500ma, 0 c t j + 125 c, c i =2.2 m f, c o = 1 m 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 is used. lm7915a electrical characteristics characteristic symbol test conditions min typ max unit t j =+ 25 c -11.75 -12 -12.25 output voltage v o i o = 5ma to 1a, p o 15w v i = -15.5 to -27v -11.5 -12 -12.5 v v i = -14.5 to -30v 12 240 v i = -16 to -22v 6 120 t j = +25 c i o = 5ma to 1.5a 12 240 t j =+ 25 c i o = 250 to 750ma 4 120 quiescent current i q t j =+ 25 c 3 6 ma i o = 5ma to 1a 0.05 0.5 v i = -15 to -30v 0.1 1 temperature coefficient of v d d v o / d t i o = 5ma -0.8 mv/ c output noise voltage v n f = 10hz to 100khz t a =+ 25 c 200 m v ripple rejection rr f = 120hz d v i = 10v 54 60 db dropout voltage v d t j =+ 25 c i o = 1a 2 v short circuit current i sc t j =+ 25 c, v i = -35v 300 ma peak current i pk t j =+ 25 c 2.2 a line regulation load regulation d v o d v o mv t j =+25 c mv quiescent current change d i q ma
lm79xx/a (ka79xx, mc79xx ) fixed voltage regulator (negative) (v i = 23v, l o = 500ma, 0 c t j + 125 c, c i =2.2 m f, c o = 1 m 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 is used. typical performance characteristics characteristic symbol test conditions min typ max unit t j = +25 c -14.7 -15 -15.3 output voltage v o i o = 5ma to 1a, p o 15w v i = -18 to -30v -14.4 -15 -15.6 v v i = -17.5 to -30v 12 300 v i = -20 to -26v 6 150 t j =+ 25 c i o = 5ma to 1.5a 12 300 t j =+ 25 c i o = 250 to 750ma 4 150 quiescent current i q t j =+ 25 c 3 6 ma i o = 5ma to 1a 0.05 0.5 v i = -18.5 to -30v 0.1 1 temperature coefficient of v d d v o / d t i o = 5ma -0.9 mv/ c output noise voltage v n f = 10hz to 100khz t a =+25 c 250 m v ripple rejection rr f = 120hz d v i = 10v 54 60 db dropout voltage v d t j = +25 c i o = 1a 2 v short circuit current i sc t j =+ 25 c, v i = -35v 300 ma peak current i pk t j =+ 25 c 2.2 a line regulation d v o load regulation d v o t j =+25 c quiescent current change d i q mv mv ma
lm79xx/a (ka79xx, mc79xx ) fixed voltage regulator (negative) fig.1 output voltage fig. 2 load regulation -5 -3 -1 1 3 5 7 9 11 13 15 -40 -25 0 25 50 75 100 125 4.8 4.85 4.9 4.95 5 5.05 5.1 -40 -25 0 25 50 75 100 125 vin=10v io=40ma vin=25v io=100ma io=0.75a io=1.5a output voltage [-v] t a , ambient temperature [ o c] load regulation [mv] t a , ambient temperature [ o c] fig.3 quiescent current fig. 4 dropout voltage fig.5 short circuit current typical applications 0 0.5 1 1.5 2 2.5 3 3.5 4 -40 -25 0 25 50 75 100 125 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 -40 -25 0 25 50 75 100 125 io=1a quiescent current [ma] dropout voltage [v] t a , ambient temperature [ o c] t a , ambient temperature [ o c] -0.1 -0.05 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 -40 -25 0 25 50 75 100 125 short circuit current [a] t a , ambient temperature [ o c]
lm79xx/a (ka79xx, mc79xx ) fixed voltage regulator (negative) fig. 6 negative fixed output regulator 2.2 m m f 2 - v i - v o ka79xx 1 3 + + 1 m m f c i c o fig. 7 split power supply ( 12v/1a) 1n4001 2.2 m m f 2 - 15v -12v ka7912 1 3 + + 1 m m f 0.33 m m f + ka7812 + 15v +12v + 1 m m f 1 2 3 1n4001 gnd * * notes: (1) to specify an output voltage, substitute voltage value for ?xx ? (2) required for stability. for value given, capacitor must be solid tantalum. if aluminum electronics are used, at least ten times value shown should be selected. c i 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 (1n400l or similar) should be introduced to protect the device from momentary input short circuit. * : against potential latch-up problems .
trademarks acex? coolfet? crossvo l t? e 2 cmos tm f act? f act quiet series? f ast ? f as t r? g t o? hisec? the following are registered and unregistered trademarks fairchild semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. life support policy f airchilds products are not authorized for use as critical components in life suppo r t devices or systems without the express written appro v al of f airchild semiconduc t or corpor a tion. as used herein: isoplanar? microwire? pop? power t rench? qs? quiet series? supersot?-3 supersot?-6 supersot?-8 t inylogic? 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the bod y , or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the use r . 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to a f fect its safety or e f fectiveness. product s t a tus definitions definition of t erms datasheet identification product status definition advance information preliminary no identification needed obsolete this datasheet contains the design specifications for product development. specifications may change in any manner without notice. this datasheet contains preliminary data, and supplementary data will be published at a later date. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. this datasheet contains final specifications. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. this datasheet contains specifications on a product that has been discontinued by fairchild semiconducto r . the datasheet is printed for reference information onl y . formative or in design first production full production not in production disclaimer fairchild semiconductor reserves the right to make changes without further notice t o any products herein to improve reliabilit y , function or design. fairchild does not assume any liability arising out of the applic a tion or use of any product or circuit described herein; neither does it convey any license under its pa tent rights, nor the rights of others.

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