LM79L05AC is OBSOLETE
LM79L05, LM79L12, LM79L12AC
SNOSBR8K – JULY 1999 – REVISED APRIL 2013
LM79LXXAC Series 3-Terminal Negative Regulators
Check for Samples: LM79L05, LM79L12, LM79L12AC, LM79L15, LM79L15AC
•2 Preset Output Voltage Error is Less than ±5%
Over Load, Line and Temperature
• Specified at an Output Current of 100mA
• Easily Compensated with a Small 0.1μF Output
• Internal Short-Circuit, Thermal and Safe
Operating Area Protection
• Easily Adjustable to Higher Output Voltages
• Maximum Line Regulation Less than 0.07%
• Maximum Load Regulation Less than 0.01%
• See AN-1112 (SNVA009) for DSBGA
The LM79LXXAC series of 3-terminal negative
voltage regulators features fixed output voltages of
−5V, −12V, and −15V with output current capabilities
in excess of 100mA. These devices were designed
using the latest computer techniques for optimizing
the packaged IC thermal/electrical performance. The
LM79LXXAC series, when combined with a minimum
output capacitor of 0.1μF, exhibits an excellent
transient response, a maximum line regulation of
0.07% VO/V, and a maximum load regulation of
The LM79LXXAC series also includes, as self-
protection circuitry: safe operating area circuitry for
output transistor power dissipation limiting, a
temperature independent short circuit current limit for
peak output current limiting, and a thermal shutdown
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.
*Required if the regulator is located far from the power supply filter.
A 1μF aluminum electrolytic may be substituted.
**Required for stability. A 1μF aluminum electrolytic may be
Figure 1. Fixed Output Regulator
−V0 = −5V − (5V/R1 + IQ) • R2,
5V/R1 > 3 IQ
Figure 2. Adjustable Output Regulator
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