NATIONAL SEMICONDUCTOR LM2679 Owner's Manual
Summary
The LM2679 is a high-efficiency, monolithic simple switcher step-down voltage regulator designed for powering inductive loads up to 5A. Ideal for engineers constructing reliable DC/DC power systems, this IC offers exceptional efficiency (>90%), a wide operational range (8V–40V), and protective features like current limiting and softstart. The accompanying manual provides comprehensive documentation covering applications, detailed electrical characteristics, connection diagrams, and ordering options for fixed (3.3V, 5V, 12V) or adjustable output versions. Use this guide to select the perfect solution for your next power regulation design project.
Manual Details
| Brand | National |
|---|---|
| Pages | 26 |
| File Size | 837.92 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What is maintained if I use this regulator in a life support system?
National Semiconductor requires express written approval of its President and General Counsel to use it as critical components in life support devices or systems.
How can I prevent high input surge current when powering on the device?
You can reduce the input surge current at power-ON by adding a softstart timing capacitor to gradually turn on the regulator.
What are the available output voltage types and ranges?
The series offers fixed output voltages of 3.3V, 5V, and 12V, as well as adjustable versions (e.g., LM2679SD-ADJ).
What is the maximum operating junction temperature for the regulator?
The device has a regulated junction temperature range spanning from -40˚C to 125˚C.