3-Terminal 1A Negative oltage Regulator www.fairchildsemi.com Features Output Current in Excess of 1A s of -5, -6, -8, -9, -10, -12, -15, -18 and - 24 Internal Thermal Overload Protection Short Circuit Protection Output Transistor Safe Operating Area Compensation Description 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 operating area protection, making it essentially indestructible. TO-220 in 1 1. GND 2. Input 3. Output Internal Block Digram GND R1 OLTAGE REFERENCE R2 + - Q1 Q2 Output I1 I2 PROTECTION CIRCUITRY Rsc In Input Rev. 1.0 2002 Fairchild Semiconductor Corporation
Absolute Maximum Ratings Parameter Symbol alue Unit Input oltage I -35 Thermal Resistance Junction-Case (Note1) RθJC 5 Thermal Resistance Junction-Air (Note1, 2) RθJA 65 C/W Operating Temperature Range TOPR 0 ~ +125 C Storage Temperature Range TSTG -65 ~ +150 C Note: 1. Thermal resistance test board Size: 76.2mm * 114.3mm * 1.6mm(1S0P) JEDEC standard: JESD51-3, JESD51-7 2. Assume no ambient airflow Electrical Characteristics (LM7905) (I = -10, IO = 500, 0 C TJ +125 C, CI =2.2µF, CO =1µF, unless otherwise specified.) -4.8-5.0-5.2 O IO = 5 to 1A, PO 15W -4.75-5.0-5.25 I = -7 to -20 Line Regulation (Note3) O I = -7 to -25-35 100 I = -8 to -12-8 50 Load Regulation (Note3) O IO = 5 to 1.5A - 10 100 TJ =+25 C IO = 250 to 750-3 50 Quiescent Current IQ TJ =+25 C - 3 6 I = -8 to -25-0.1 0.8 Temperature Coefficient of D o/ T IO = 5 - - 0.4 - / C TA =+25 C - 40 - µ I = 10 Dropout oltage D - 2 - Short Circuit Current ISC TJ =+25 C, I = -35-300 - Peak Current IPK TJ =+25 C - 2.2 - A Note 3. Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken 2
Electrical Characteristics (LM7906) (Continued) (I = -11, IO = 500, 0 C TJ +125 C, CI =2.2µF, CO =1µF, unless otherwise specified.) -5.75-6 -6.25 O IO = 5 to 1A, PO 15W -5.7-6 -6.3 I = -9 to -21 Line Regulation (Note1) O I = -8 to -25-10 120 I = -9 to -13-5 60 Load Regulation (Note1) O IO = 5 to 1.5A - 10 120 TJ =+25 C IO = 250 to 750-3 60 Quiescent Current IQ TJ =+25 C - 3 6 I = -8 to -25-0.1 1.3 Temperature Coefficient of D o/ T IO = 5 - -0.5 - / C TA =+25 C - 130 - µ I = 10 Dropout oltage D - 2 - Short Circuit Current ISC, I = -35-300 - Peak Current IPK - 2.2 - A Note 1. Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken 3
Electrical Characteristics (LM7908) (Continued) (I = -14, IO = 500, 0 C TJ +125 C, CI =2.2µF, CO =1µF, unless otherwise specified.) -7.7-8 -8.3 O IO = 5 to 1A, PO 15W -7.6-8 -8.4 I = -10 to -23 Line Regulation (Note1) O I = -10.5 to -25-10 160 I = -11 to -17-5 80 Load Regulation (Note1) O IO = 5 to 1.5A - 12 160 TJ =+25 C IO = 250 to 750-4 80 Quiescent Current IQ TJ =+25 C - 3 6 I = -10.5 to -25-0.1 1 Temperature Coefficient of D o/ T IO = 5 - -0.6 - / C TA =+25 C - 175 - µ I = 10 Dropout oltage D - 2 - Short Circuit Current ISC, I = -35-300 - Peak Current IPK - 2.2 - A Note 1. Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken 4
Electrical Characteristics (LM7909) (Continued) (I = -15, IO = 500, 0 C TJ +125 C, CI =2.2µF, CO =1µF, unless otherwise specified.) -8.7-9.0-9.3 O IO = 5 to 1A, PO 15W -8.6-9.0-9.4 I = -1.5 to -23 Line Regulation (Note1) O I = -11.5 to -26-10 180 I = -12 to -18-5 90 Load Regulation (Note1) O IO = 5 to 1.5A - 12 180 IO = 250 to 750-4 90 Quiescent Current IQ - 3 6 I = -11.5 to -26-0.1 1 Temperature Coefficient of D o/ T IO = 5 - -0.6 - / C TA = +25 C - 175 - µ I = 10 Dropout oltage D - 2 - Short Circuit Current ISC, I = -35-300 - Peak Current IPK - 2.2 - A Note: 1. Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken 5
Electrical Characteristics (LM7910) (Continued) (I = -17, IO = 500, 0 C TJ +125 C, CI =2.2µF, CO =1µF, unless otherwise specified.) -9.6-10 -10.4 O IO = 5 to 1A, Pd 15W -9.5-10 -10.5 I = -12 to -28 Line Regulation (Note1) O I = -12.5 to -28-12 200 I = -14 to -20-6 100 Load Regulation (Note1) O IO = 5 to 1.5A - 12 200 IO = 250 to 750-4 100 Quiescent Current IQ - 3 6 I = -12.5 to -28-0.1 1 Temperature Coefficient of O o/ T IO = 5 - -1 - / C 10Hz f 100kHz TA =+25 C - 280 - µ I = 10 Dropout oltage D - 2 - Short Circuit Current ISC, I = -35-300 - Peak Current IPK - 2.2 - A Note: 1. Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken 6
Electrical Characteristics (LM7912) (Continued) (I = -19, IO = 500, 0 C TJ +125 C, CI =2.2µF, CO =1µF, unless otherwise specified.) -11.5-12 -12.5 O IO = 5 to 1A, PO 15W -11.4-12 -12.6 I = -15.5 to -27 Line Regulation (Note1) O I = -14.5 to -30-12 240 I = -16 to -22-6 120 Load Regulation (Note1) O IO = 5 to 1.5A - 12 240 IO = 250 to 750-4 120 Quiescent Current IQ - 3 6 I = -14.5 to -30-0.1 1 Temperature Coefficient of D o/ T IO = 5 - -0.8 - / C TA = +25 C - 200 - µ I = 10 Dropout oltage D - 2 - Short Circuit Current ISC, I = -35-300 - Peak Current IPK - 2.2 - A Note: 1. Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken 7
Electrical Characteristics (LM7915) (Continued) (I = -23, IO = 500, 0 C TJ +125 C, CI =2.2µF, CO =1µF, unless otherwise specified.) -14.4-15 -15.6 O IO = 5 to 1A, PO 15W -14.25-15 -15.75 I = -18 to -30 Line Regulation (Note1) O I = -17.5 to -30-12 300 I = -20 to -26-6 150 Load Regulation (Note1) O IO = 5 to 1.5A - 12 300 IO = 250 to 750-4 150 Quiescent Current IQ - 3 6 I = -17.5 to -30-0.1 1 Temperature Coefficient of D o/ T IO = 5 - -0.9 - / C TA =+25 C - 250 - µ I = 10 Dropout oltage D - 2 - Short Circuit Current ISC, I = -35-300 - Peak Current IPK - 2.2 - A Note: 1. Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken 8
Electrical Characteristics (LM7918) (Continued) (I = -27, IO = 500, 0 C TJ +125 C, CI =2.2µF, CO =1µF, unless otherwise specified.) -17.3-18 -18.7 O IO = 5 to 1A, PO 15W -17.1-18 -18.9 I = -22.5 to -33 Line Regulation (Note1) O I = -21 to -33-15 360 I = -24 to -30-8 180 Load Regulation (Note1) O IO = 5 to 1.5A - 15 360 IO = 250 to 750-5 180 Quiescent Current IQ - 3 6 I = -21 to -33-0.1 1 Temperature Coefficient of D o/ T IO = 5 - -1 - / C TA = +25 C - 300 - µ I = 10 Dropout oltage D - 2 - Short Circuit Current ISC, I = -35-300 - Peak Current IPK - 2.2 - A Note: 1. Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken 9
Electrical Characteristics (LM7924) (Continued) (I = -33, IO = 500, 0 C TJ +125 C, CI =2.2µF, CO =1µF, unless otherwise specified.) -23-24 -25 O IO = 5 to 1A, PO 15W -22.8-24 -25.2 I = -27 to -38 Line Regulation (Note1) O I = -27 to -38-15 480 I = -30 to -36-8 180 Load Regulation (Note1) O IO = 5 to 1.5A - 15 480 IO = 250 to 750-5 240 Quiescent Current IQ - 3 6 I = -27 to -38-0.1 1 Temperature Coefficient of D o/ T IO = 5 - -1 - / C TA = +25 C - 400 - µ I = 10 Dropout oltage D - 2 - Short Circuit Current ISC, I = -35-300 - Peak Current IPK - 2.2 - A Note: 1. Load and line regulation are specified at constant junction temperature. Changes in O due to heating effects must be taken 10
Typical Perfomance Characteristics Ou tp ut [-] o lta 5.1 5.05 4.95 5 ge [- 4.9 ] 4.85 4.8 in=10 Io=40 in=25 Io=100-40 -25 0 25 50 75 100 125 TA, Ambient Temperature [ o C] Load Regulation[] 15 13 Lo ad 11 Re 9 gul 7 ati 5 on 3 [m 1 ] -1-3 -5 Io=1.5A Io=0.75A -40-25 0 25 50 75 100 125 TA, Ambient Temperature [ o C] Figure 1. Figure 2. Load Regulation Quiescent Current [] 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0-40 -25 0 25 50 75 100 125 TA, Ambient Temperature [ o C] D t lt [] Dropout oltage [] 4 3.5 3 2.5 2 1.5 Io=1A 1 0.5 0-40 -25 0 25 50 75 100 125 TA, Ambient Temperature [ o C] Figure 3. Quiescent Current Figure 4. Dropout oltage Short Circuit Current[A] 0.6 0.55 Sh 0.5 ort 0.45 Cir 0.4 cui0.35 0.3 t 0.25 Cu 0.2 rre0.15 nt 0.1 [A] 0.05 0-0.05-0.1-40 -25 0 25 50 75 100 125 TA, Ambient Temperature [ o C] Figure 5. Short Circuit Current 11
Typical Applications CI + 2.2µF + 1µF 1 2 3 - I KA79XX - O Input LM79XX Output Figure 6. Negative Fixed output regulator CO 1 3 + 15 MC7812 KA7812 +12 + + C1 2 Co 1N4001 0.33µF 1µF * GND + 2.2µF 1µF + C1 1 Co 1N4001 * 2 3-15 LM7912 KA7912-12 Figure 7. Split power supply ( ± 12/1A) 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 aluminium electronics are used, at least ten times value shown should be selected. CI 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. 12
Mechanical Dimensions Package Dimensions in millimeters TO-220 9.90 ±0.20 4.50 ±0.20 (1.70) 1.30 ±0.10 (8.70) ø3.60 ±0.10 2.80 ±0.10 1.51 +0.10 0.10 9.20 ±0.20 13.08 ±0.20 (1.46) (1.00) 1.27 ±0.10 (45 ) (3.00) (3.70) 15.90 ±0.20 1.52 ±0.10 10.08 ±0.30 18.95MAX. 2.54TYP [2.54 ±0.20] 0.80 ±0.10 2.54TYP [ 2.54 ±0.20 0.50 +0.10 0.05 2.40 ±0.20 10.00 ±0.20 13
Ordering Information Product Number Tolerance Package Operating Temperature LM7905CT ±4% TO-220 0 ~ +125 C LM7906CT LM7908CT LM7909CT LM7910CT LM7912CT LM7915CT LM7918CT LM7924CT 14
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