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LM79XX Dataheets PDF



Part Number LM79XX
Manufacturers National Semiconductor
Logo National Semiconductor
Description LM79XX Series 3-Terminal Negative Regulators
Datasheet LM79XX DatasheetLM79XX Datasheet (PDF)

LM79XX Series 3-Terminal Negative Regulators November 1994 LM79XX Series 3-Terminal Negative Regulators General Description The LM79XX series of 3-terminal regulators is available with fixed output voltages of b5V b8V b12V and b15V These devices need only one external component a compensation capacitor at the output The LM79XX series is packaged in the TO-220 power package and is capable of supplying 1 5A of output current These regulators employ internal current limiting safe area protection .

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LM79XX Series 3-Terminal Negative Regulators November 1994 LM79XX Series 3-Terminal Negative Regulators General Description The LM79XX series of 3-terminal regulators is available with fixed output voltages of b5V b8V b12V and b15V These devices need only one external component a compensation capacitor at the output The LM79XX series is packaged in the TO-220 power package and is capable of supplying 1 5A of output current These regulators employ internal current limiting safe area protection and thermal shutdown for protection against virtually all overload conditions Low ground pin current of the LM79XX series allows output voltage to be easily boosted above the preset value with a resistor divider The low quiescent current drain of these devices with a specified maximum change with line and load ensures good regulation in the voltage boosted mode For applications requiring other voltages see LM137 data sheet Features Y Y Y Y Thermal short circuit and safe area protection High ripple rejection 1 5A output current 4% tolerance on preset output voltage Connection Diagrams TO-220 Package Typical Applications Fixed Regulator TL H 7340 – 3 TL H 7340 – 14 Front View Order Number LM7905CT LM7912CT or LM7915CT See NS Package Number TO3B Required if regulator is separated from filter capacitor by more than 3 For value given capacitor must be solid tantalum 25 mF aluminum electrolytic may be substituted Required for stability For value given capacitor must be solid tantalum 25 mF aluminum electrolytic may be substituted Values given may be increased without limit For output capacitance in excess of 100 mF a high current diode from input to output (1N4001 etc ) will protect the regulator from momentary input shorts C1995 National Semiconductor Corporation TL H 7340 RRD-B30M115 Printed in U S A Absolute Maximum Ratings (Note 1) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Input Voltage (Vo e b5V) (Vo e b12V and b15V) b 25V b 35V Input-Output Differential (Vo e b5V) (Vo e b12V and b15V) 25V 30V Power Dissipation (Note 2) Internally Limited Operating Junction Temperature Range 0 C to a 125 C b 65 C to a 150 C Storage Temperature Range Lead Temperature (Soldering 10 sec ) 230 C Electrical Characteristics Conditions unless otherwise noted IOUT e 500 mA CIN e 2 2 mF COUT e 1 mF 0 C s TJ s a 125 C Power Dissipation s 1 5W Part Number Output Voltage Input Voltage (unless otherwise specified) Symbol VO Parameter Output Voltage Conditions TJ e 25 C 5 mA s IOUT s 1A P s 15W TJ e 25 C (Note 3) Min b4 8 b 4 75 LM7905C b 5V b 10V Units Max b5 2 b 5 25 Typ b5 0 (b20 s VIN s b7) 8 (b25 s VIN s b7) 2 (b12 s VIN s b8) 15 5 1 (b25 s VIN s b7) 50 15 V V V mV V mV V mV mV mA mA V mA mV dB V V A mV C D VO Line Regulation D VO Load Regulation TJ e 25 C (Note 3) 5 mA s IOUT s 1 5A 250 mA s IOUT s 750 mA TJ e 25 C With Line With Load 5 mA s IO.


LM79M05C LM79XX LM7M632


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