LM117/LM317A/LM317 3-Terminal Adjustable Regulator General Description
The LM117 series of adjustable 3‑terminal positive voltage regulators provides up to 1.5 A output current over a 1.2 V to 37 V range. The devices include built‑in overload protection (current limit, thermal overload and safe‑area protection) and require only two external resistors to set the output voltage.
The document details package options (TO‑3, TO‑39, TO‑220, TO‑263, SOT‑223, D‑Pack), absolute maximum ratings, electrical characteristics, typical performance curves and application notes such as capacitor recommendations, heatsinking guidelines and protection‑diode usage.
| Maximum Output Current | 1.5 A |
|---|---|
| Output Voltage Range | 1.2 V – 37 V |
| Line Regulation (LM317A) | 0.01 %/V |
| Load Regulation (LM117) | 0.3 % (typ) |
| Ripple Rejection | 80 dB |
| Operating Temperature Range (LM117) | -55 °C – +150 °C |
The regulators can deliver up to 1.5 A of output current.
The devices tolerate a differential of up to 40 V.
Only two external resistors are needed to set the output voltage.