National Semiconductor LM117 LM317A LM317 Data Sheet
Summary
Highly accurate and versatile adjustable voltage regulators (LM117/LM317) designed for professional electronics applications. These high-performance ICs provide stable output voltages ranging from 1.2V to 37V, offering superior line regulation, excellent ripple rejection, and integrated protection features like overcurrent and thermal shutdown. This technical manual serves as a comprehensive guide, providing detailed specifications, diverse packaging options (including surface mount), connection diagrams, and ordering information for engineers requiring reliable power management in their circuit designs.
Manual Details
| Brand | National |
|---|---|
| Pages | 25 |
| File Size | 718.29 KB |
| Published | June 04, 2026 |
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Frequently Asked Questions
How do I set a specific adjustable output voltage?
You need to use two external resistors connected between the adjustment pin and the output.
What built-in protections does this regulator provide?
It includes current limit, thermal overload protection, and safe area protection. The output is also short-circuit protected.
Are capacitors required for normal operation?
Not usually, but an optional output capacitor (1µF to 1000µF) enhances transient response.
How does the regulator function in high temperatures?
The overload protection circuitry remains fully functional even if the adjustment terminal is disconnected.