LM79L05AC is OBSOLETE

LM79L05, LM79L12, LM79L12AC

LM79L15, LM79L15AC

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SNOSBR8K – JULY 1999 – REVISED APRIL 2013

LM79LXXAC Series 3-Terminal Negative Regulators

Check for Samples: LM79L05, LM79L12, LM79L12AC, LM79L15, LM79L15AC

1

FEATURES

DESCRIPTION

The

LM79LXXAC

series

of

3-terminal

negative

2

•

Preset Output Voltage Error is Less than ±5%

voltage regulators features fixed output voltages of

Over Load, Line and Temperature

−5V, −12V, and −15V with output current capabilities

•

Specified at an Output Current of 100mA

in excess of 100mA. These devices were designed

•

Easily Compensated with a Small 0.1

μF Output

using the latest computer techniques for optimizing

the packaged IC thermal/electrical performance. The

Capacitor

LM79LXXAC series, when combined with a minimum

•

Internal Short-Circuit, Thermal and Safe

output capacitor of 0.1

μF, exhibits an excellent

Operating Area Protection

transient response, a maximum line regulation of

•

Easily Adjustable to Higher Output Voltages

0.07% VO/V, and a maximum load regulation of

0.01% VO/mA.

•

Maximum Line Regulation Less than 0.07%

VOUT/V

The LM79LXXAC series also includes, as self-

•

Maximum Load Regulation Less than 0.01%

protection circuitry: safe operating area circuitry for

output

transistor

power

dissipation

limiting,

a

VOUT/mA

temperature independent short circuit current limit for

•

See AN-1112 (SNVA009) for DSBGA

peak output current limiting, and a thermal shutdown

Considerations

circuit to prevent excessive junction temperature.

Although

designed

primarily

as

fixed

voltage

regulators, these devices may be combined with

simple external circuitry for boosted and/or adjustable

voltages and currents. The LM79LXXAC series is

available in the 3-lead TO package, the 8-lead SOIC

package, and the 6-Bump DSBGA package.

For output voltages other than the pre-set -5V, -12V

and -15V, the LM137L series provides an adjustable

output voltage range from -1.2V to -47V.

Typical Applications

*Required if the regulator is located far from the power supply filter.

A 1

μF aluminum electrolytic may be substituted.

−V0 = −5V − (5V/R1 + IQ) • R2,

**Required for stability. A 1

μF aluminum electrolytic may be

5V/R1 > 3 IQ

substituted.

Figure 1. Fixed Output Regulator

Figure 2. Adjustable Output Regulator

1

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

2

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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.