National LM320L LM79LXXAC Series User Guide
Summary
These reliable 3-terminal negative voltage regulators are designed to provide stable fixed outputs (-5V, -12V, -15V) for various electronic applications. Available in TO-92, SOIC, and micro SMD packages, they feature enhanced performance with excellent transient response and comprehensive safety mechanisms. The manual provides detailed electrical specifications, covering load, line, and ripple regulation across a wide operating temperature range, making these regulators ideal for engineers requiring high-precision negative power supplies in demanding circuit designs.
Page 1 Text Content
查询LM13121Z-12供应商
February
LM 320L/LM 79LX eries 3-Term inal N egative egulators
LM320L/LM79LXXAC Series 3-Terminal Negative Regulators
TO-92 package, 8-lead SOIC package, and the 6-Bump
General Description
micro SMD package. The LM320L series is available in the
The LM320L/LM79LXXAC dual marked series of 3-terminal
3-lead TO-92 package.
negative voltage regulators features fixed output voltages of
For output voltage other than −5V, −12V and −15V, the
−5V, −12V, and −15V with output current capabilities in
LM137L series provides an output voltage range from 1.2V
excess of 100m A. These devices were designed using the
to 47V.
latest computer techniques for optimizing the packaged IC thermal/electrical performance. The LM79LXXAC series,
even when combined with minimum output compensation Features
capacitor of 0.1µF, exhibits an excellent transient response, Preset output voltage error is less than ±5% overload,
maximum line regulation of 0.07% VO/V, and maximum line and temperature
load regulation of 0.01% VO/m A. Specified at an output current of 100m A The LM320L/LM79LXXAC series also includes, as self- Easily compensated with small 0.1µF output protection circuitry: safe operating area circuitry for output capacitor transistor power dissipation limiting, temperature indepen- Internal short-circuit, thermal and safe operating area dent short circuit current limit for peak output current limiting, protection and thermal shutdown circuit to prevent excessive junction
Easily adjustable to higher output voltages
temperature. Although designed primarily as fixed voltage
Maximum line regulation less than 0.07% VOUT/V
regulators, these devices may be combined with simple
Maximum load regulation less than 0.01% VOUT/m A
external circuitry for boosted and/or adjustable voltages and
See AN-1112 for micro SMD considerations
currents. The LM79LXXAC series is available in the 3-lead
Typical Applications
Adjustable Output Regulator
Fixed Output Regulator
*Required if the regulator is located far from the power supply filter. 1µF
−V0 −5V (5V/R1 IQ) R2,
aluminum electrolytic may be substituted.
5V/R1 IQ
**Required for stability. 1µF aluminum electrolytic may be substituted.
Connection Diagrams
6-Bump micro SMD TO-92 Plastic Package (Z)
Bump Side Down
National Semiconductor Corporation DS007748 www.national.com
Page Summary Contents For National LM320L LM79LXXAC Series User Guide
Manual Details
| Brand | National |
|---|---|
| Pages | 8 |
| File Size | 610.48 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What is the operating temperature range?
The standard operating temperature range is 0˚C to +70˚C.
Are there built-in protection features?
Yes, it includes safe operating area circuitry, overcurrent/short-circuit limit for peak output current, and thermal shutdown circuit.
What are the maximum regulation specs?
The device offers a maximum line regulation of 0.07% V/V and a maximum load regulation of 0.01% V/mA.
How must I connect an output capacitor for stability?
A capacitance of at least 1µF is required. A 1µF aluminum electrolytic may be substituted.