LM7905, LM7912, LM7915

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SNOSBQ7C – JUNE 1999 – REVISED MAY 2013

LM79XX Series 3-Terminal Negative Regulators

Check for Samples: LM7905, LM7912, LM7915

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FEATURES

Connection Diagram

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•

Thermal, Short Circuit and Safe Area

Protection

•

High Ripple Rejection

•

1.5A Output Current

•

4% Tolerance on Preset Output Voltage

space

DESCRIPTION

Figure 1. TO-220 Package

The LM79XX series of 3-terminal regulators is

Front View

available with fixed output voltages of

−5V, −12V, and

See Package Number NDE0003B

−15V.

These

devices

need

only

one

external

component—a compensation capacitor at the output.

The LM79XX series is packaged in the TO-220 power

Typical Applications

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

*Required if regulator is separated from

current drain of these devices with a specified

filter capacitor by more than 3

″. For value

maximum change with line and load ensures good

given, capacitor must be solid tantalum.

regulation in the voltage boosted mode.

25

μF aluminum electrolytic may be

substituted.

For applications requiring other voltages, see LM137

†Required for stability. For value given,

datasheet.

capacitor must be solid tantalum. 25

μF

aluminum electrolytic may be substituted.

Values given may be increased without

limit.

For output capacitance in excess of 100

μF,

a high current diode from input to output

(1N4001, etc.) will protect the regulator

from momentary input shorts.

Figure 2. Fixed Regulator

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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PRODUCTION DATA information is current as of publication date.

Copyright © 1999–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.