National Semiconductor - LM117 LM317A LM317 3-Terminal Adjustable Regulator Data Manual, User Guide
Summary
The LM117 and LM317 adjustable regulators are high-performance, stable solutions for electronic circuit design, offering programmable 3-terminal positive voltages from 1.2V to 37V. Known for superior line and load regulation, these regulators ensure reliable power delivery across diverse applications. This guide details product specifications, various package options (including TO-220 and SOT-23), connection diagrams, and ordering information necessary for integrating precision voltage control into your next project. Ideal for engineers requiring reliable and customizable power management solutions.
Manual Details
| Brand | National |
|---|---|
| Pages | 25 |
| File Size | 736.98 KB |
| Published | June 02, 2026 |
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Frequently Asked Questions
Is the LM117 safe in short circuits?
Yes, the output is short-circuit protected, relying only on the input-to-output differential voltage.
How can I regulate an adjustable output voltage?
It is easy to set using only two external resistors: one fixed resistor between the adjustment pin and the output, and another for the other leg.
Does the regulator protect against overloads?
Yes, it includes current limit, thermal overload, and safe area protection circuits. All these remain functional even if the adjustment terminal is disconnected.
What are the best practices for maintaining transient response?
Adding an optional output capacitor (1µF to 1000µF) of aluminum or tantalum electrolytic is recommended to improve transient response.