3-ERMINAL 1A NEGAIE OLAGE REGULAORS he LM79XX series of three-terminal negative regulators are available in O-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. O-220 FEAURES Output Current in Excess of 1A Output oltages of -5, -6, -8, -12, -15, -18, -24 Internal hermal Overload Protection Short Circuit Protection Output ransistor Safe-Area Compensation ORDERING INFORMAION 1: GND 2: Input 3: Output Device Output oltage olerance Package Operating emperature LM79XXC ± 4% LM79XXA ± 2% O-220 0 ~ +125 C BLOCK DIAGRAM GND R1 OLAGE REFERENCE R2 + - Q1 Q2 Out I1 I2 PROECION CIRCUIRY Rsc In Rev. B 1999 Fairchild Semiconductor Corporation
ABSOLUE MAXIMUM RAINGS ( A=+25 C, unless otherwise specified) Characteristic Symbol alue Unit Input oltage I -35 hermal Resistance Junction-Cases Junction-Air R θjc 5 R θja 65 Operating emperature Range OPR 0 ~ +125 C Storage emperature Range SG - 65 ~ +150 C C / W C /W LM7905 ELECRICAL CHARACERISICS ( I = 10, l O = 500mA, 0 C J +125 C, C I =2.2µF, C O =1µF, unless otherwise specified.) J =+25 C - 4.8-5.0-5.2 Output oltage O I O = 5mA to 1A, P O 15W - 4.75-5.0-5.25 I = -7 to -20 I = -7 to -20 5 50 I O=1A J =25 C I = -8 to -12 2 25 I O=1A I = -7.5 to -25 7 50 I= -8 to -12 I O=1A 7 50 10 100 J =+25 C 3 50 Quiescent Current I Q J =+25 C 3 6 ma Quiescent Current Change I Q I O = 5mA to 1A 0.05 0.5 ma I = -8 to -25 0.1 0.8 emperature Coefficient of D / I O = 5mA - 0.4 / C Output Noise oltage N A =+25 C, I O = -35 I = 10 40 µ Dropout oltage J=+25 C D 2 Short Circuit Current I SC J =+25 C, I = -35 300 ma Peak Current I PK J =+25 C 2.2 A * Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken
LM7906 ELECRICAL CHARACERISICS ( I = 11, l O = 500mA, 0 C J +125 C, C I =2.2µF, C O = 1µF, unless otherwise specified.) J = +25 C - 5.75-6 - 6.25 Output oltage O I O = 5mA to 1A, P O 15W I = - 9 to - 21-5.7-6 - 6.3 J = 25 C I = - 8 to - 25 10 120 I= - 9 to -12 5 60 10 120 3 60 Quiescent Current I Q 3 6 ma I O = 5mA to 1A 0.5 Quiescent Current Change I Q ma I = -9 to -25 1.3 emperature Coefficient of D / I O = 5mA -0.5 / C Output Noise oltage N A =+ 25 C I = 10 * Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken 130 µ Dropout oltage J=+ 25 C D 2 Short Circuit Current I SC J= +25 C, I = -35 300 ma Peak Current I PK J= +25 C 2.2 A
LM7908 ELECRICAL CHARACERISICS ( I = 14, l O = 500mA, 0 C J +125 C, C I =2.2µF, C O = 1µF, unless otherwise specified.) - 7.7-8 - 8.3 Output oltage O I O = 5mA to 1A, P O 15W I = -1.5 to -23-7.6-8 - 8.4 I = -10.5 to -25 10 100 J = 25 C I= -11 to -17 5 80 12 160 4 80 Quiescent Current I Q 3 6 ma I O = 5mA to 1A 0.05 0.5 Quiescent Current Change I Q ma I = -11.5 to -25 0.1 1 emperature Coefficient of D / I O = 5mA -0.6 / C Output Noise oltage N A =+ 25 C I = 10 * Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken 175 µ Dropout oltage J=+ 25 C D 2 Short Circuit Current I SC J=+ 25 C, I = -35 300 ma Peak Current I PK J=+ 25 C 2.2 A
LM7909 ELECRICAL CHARACERISICS ( I = 14, l O = 500mA, 0 C J + 125 C, C I =2.2µF, C O = 1µF, unless otherwise specified) - 8.7-9.0-9.3 Output oltage O I O = 5mA to 1A, P O 15W I = -1.5 to -23-8.6-9.0-9.4 I = -10.5 to -25 10 180 J = 25 C I= -11 to -17 5 90 12 180 4 90 Quiescent Current I Q 3 6 ma I O = 5mA to 1A 0.05 0.5 Quiescent Current Change I Q ma I = -11.5 to -25 0.1 1 emperature Coefficient of D / I O = 5mA -0.6 / C Output Noise oltage N 175 µ A =+ 25 C I = 10 Dropout oltage J=+ 25 C D 2 Short Circuit Current I SC J= +25 C, I = -35 300 ma Peak Current I PK J =+25 C 2.2 A * Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken
LM7912 ELECRICAL CHARACERISICS ( I= 18, l O =500mA, 0 C J +125 C, C I =2.2µF, C O = 1µF, unless otherwise specified.) J = +25 C -11.5-12 -12.5 Output oltage O I O = 5mA to 1A, P O 15W I = -15.5 to -27-11.4-12 -12.6 I = -14.5 to -30 12 240 J = 25 C I= -16 to -22 6 120 12 240 4 120 Quiescent Current I Q 3 6 ma Quiescent Current Change I Q I O = 5mA to 1A 0.05 0.5 I = -15 to -30 0.1 1 ma emperature Coefficient of D / I O = 5mA -0.8 / C Output Noise oltage N A =+ 25 C 200 µ I = 10 Dropout oltage J= +25 C D 2 Short Circuit Current I SC J=+ 25 C, I = -35 300 ma Peak Current I PK J=+ 25 C 2.2 A * Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken
LM7915 ELECRICAL CHARACERISICS ( I = 23, I O = 500mA, 0 C J +125 C, C I =2.2µF, C O = 1µF, unless otherwise specified.) -14.4-15 -15.6 Output oltage O I O = 5mA to 1A, P O 15W I = -18 to -30-14.25-15 -15.75 J = 25 C I = -17.5 to -30 12 300 I= -20 to -26 6 150 12 300 4 150 Quiescent Current I Q 3 6 ma I O = 5mA to 1A 0.05 0.5 Quiescent Current Change I Q ma I = -18.5 to -30 0.1 1 emperature Coefficient of D / I O = 5mA -0.9 / C f = 10Hz to 100Khz Output Noise oltage N 250 µ A =+ 25 C I = 10 Dropout oltage J=+25 C D 2 Short Circuit Current I SC J=+ 25 C, I = -35 300 ma Peak Current I PK J=+ 25 C 2.2 A * Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken
LM7918 ELECRICAL CHARACERISICS ( I = 27, l O = 500mA, 0 C J +125 C, C I =2.2µF, C O = 1µF, unless otherwise specified.) -17.3-18 -18.7 Output oltage O I O = 5mA to 1A, P O 15W I = -22.5 to -33-17.1-18 -18.9 J = 25 C I= -21 to -33 15 360 I= -24 to -30 8 180 15 360 5 180 Quiescent Current I Q 3 6 ma I O = 5mA to 1A 0.5 Quiescent Current Change I Q ma I = -22 to -33 1 emperature Coefficient of D / I O = 5mA -1 / C Output Noise oltage N 300 µ A =+ 25 C I = 10 Dropout oltage J=+ 25 C D 2 Short Circuit Current I SC J=+ 25 C, I = -35 300 ma Peak Current I PK J=+ 25 C 2.2 A * Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken
LM7924 ELECRICAL CHARACERISICS ( I = 33, l O = 500mA, 0 C J +125 C, C I =2.2µF, C O = 1µF, unless otherwise specified.) J =+25 C - 23-24 - 25 Output oltage O I O = 5mA to 1A, P O 15W I = -27 to -38-22.8-24 - 25.2 J = 25 C I = - 27 to - 38 15 480 I= - 30 to - 36 8 180 J = +25 C 15 480 5 240 Quiescent Current I Q 3 6 ma I O = 5mA to 1A 0.5 Quiescent Current Change I Q ma I = -27 to -38 1 emperature Coefficient of D / I O = 5mA -1 / C Output Noise oltage N 400 µ A =+ 25 C I = 10 Dropout oltage J= +25 C D 2 Short Circuit Current I SC J=+ 25 C, I = -35 300 ma Peak Current I PK J=+25 C 2.2 A * Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken
LM7905A ELECRICAL CHARACERISICS ( I = 10, l O = 500mA, 0 C J +125 C, C I =2.2µF, C O =1µF, unless otherwise specified.) - 4.9-5.0-5.1 Output oltage O I O = 5mA to 1A, P O 15W - 4.8-5.0-5.2 I = -7 to -20 I = -7 to -20 5 50 I O=1A J =+25 C I = -8 to -12 2 25 I O=1A I = -7.5 to -25 7 50 I= -8 to -12 I O=1A 7 50 10 100 3 50 Quiescent Current I Q J = +25 C 3 6 ma Quiescent Current Change I Q I O = 5mA to 1A 0.05 0.5 ma I = -8 to -25 0.1 0.8 emperature Coefficient of D / I O = 5mA - 0.4 / C Output Noise oltage N A =+ 25 C, I O = -35 I = 10 40 µ Dropout oltage J=+ 25 C D 2 Short Circuit Current I SC, I = -35 300 ma Peak Current I PK 2.2 A * Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken LM7912A ELECRICAL CHARACERISICS
( I= 18, l O =500mA, 0 C J +125 C, C I =2.2µF, C O = 1µF, unless otherwise specified.) -11.75-12 -12.25 Output oltage O I O = 5mA to 1A, P O 15W I = -15.5 to -27-11.5-12 -12.5 J =+25 C I = -14.5 to -30 12 240 I= -16 to -22 6 120 J = +25 C 12 240 4 120 Quiescent Current I Q 3 6 ma Quiescent Current Change I Q I O = 5mA to 1A 0.05 0.5 I = -15 to -30 0.1 1 ma emperature Coefficient of D / I O = 5mA -0.8 / C f = 10Hz to 100Khz Output Noise oltage N A =+ 25 C 200 µ I = 10 Dropout oltage D J=+ 25 C 2 Short Circuit Current I SC J=+ 25 C, I = -35 300 ma Peak Current I PK J=+ 25 C 2.2 A * Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken LM7915A ELECRICAL CHARACERISICS
( I = 23, l O = 500mA, 0 C J +125 C, C I =2.2µF, C O = 1µF, unless otherwise specified.) J = +25 C -14.7-15 -15.3 Output oltage O I O = 5mA to 1A, P O 15W I = -18 to -30-14.4-15 -15.6 J =+25 C I = -17.5 to -30 12 300 I= -20 to -26 6 150 12 300 4 150 Quiescent Current I Q 3 6 ma I O = 5mA to 1A 0.05 0.5 Quiescent Current Change I Q ma I = -18.5 to -30 0.1 1 emperature Coefficient of D / I O = 5mA -0.9 / C Output Noise oltage N 250 µ A =+25 C I = 10 Dropout oltage J= +25 C D 2 Short Circuit Current I SC J=+ 25 C, I = -35 300 ma Peak Current I PK J=+ 25 C 2.2 A * Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken YPICAL PERFORMANCE CHARACERISICS
Fig.1 Output oltage Fig. 2 Output oltage [-] 5.1 5.05 5 4.95 4.9 4.85 4.8 in=10 Io=40mA in=25 Io=100mA -40-25 0 25 50 75 100 125 A, Ambient emperature [ o C] [] 15 13 Io=1.5A 11 9 7 5 3 1-1 Io=0.75A -3-5 -40-25 0 25 50 75 100 125 A, Ambient emperature [ o C] Fig.3 Quiescent Current Fig. 4 Dropout oltage Quiescent Current [ma] 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 Dropout oltage [] -40-25 0 25 50 75 100 125-40 -25 0 25 50 75 100 125 A, Ambient emperature [ o C] A, Ambient emperature [ o C] 4 3.5 3 2.5 2 1.5 1 0.5 0 Io=1A Fig.5 Short Circuit Current Short Circuit Current [A] 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0-0.05-0.1-40 -25 0 25 50 75 100 125 A, Ambient emperature [ o C] YPICAL APPLICAIONS
Fig. 6 Negative Fixed output regulator CI + 2.2µF + 1µF 1 CO 2 3 - I KA79XX - O Notes: (1) o 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) o 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. Fig. 7 Split power supply (±12/1A) 1 3 + 15 KA7812 +12 + + 2 1N4001 0.33µF 1µF * GND + 2.2µF 1µF + 1 1N4001 * 2 3-15 KA7912-12 *: Against potential latch-up problems.
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