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LM320L/LM79LXXAC Series

3-Terminal Negative Regulators

General Description

The LM320L/LM79LXXAC dual marked 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, even when combined with a minimum output compensation capacitor of 0.1µF, exhibits an excellent transient response, a maximum line regulation of 0.07% VO/V, and a maximum load regulation of 0.01% VO/mA.

The LM320L/LM79LXXAC series also includes, as selfprotection 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-92 package, 8-lead SOIC package, and the 6-Bump micro SMD package. The LM320L series is available in the 3-lead TO-92 package.

For output voltage other than −5V, −12V and −15V, the LM137L series provides an output voltage range from 1.2V to 47V.

Features

• Preset output voltage error is less than ±5% overload, line and temperature
• Specified at an output current of 100mA
• Easily compensated with a small 0.1µF output capacitor
• Internal short-circuit, thermal and safe operating area protection
• Easily adjustable to higher output voltages
• Maximum line regulation less than 0.07% VOUT/V
• Maximum load regulation less than 0.01% VOUT/mA
• See AN-1112 for micro SMD considerations

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 V_O = −5V, −12V, −15V                             −35V

Internal Power Dissipation (Note 2)              Internally Limited

Operating Temperature Range                          0˚C to +70˚C

Maximum Junction Temperature                                  +125˚C

Storage Temperature Range                        −55˚C to +150˚C

Lead Temperature (Soldering, 10 sec.)                         260˚C

Connection Diagrams

Physical Dimensions inches (millimeters) unless otherwise noted