LM217L/LM317L is a low current 1.2 to 37V adjustable voltage regulator, with SO-8 and TO-92 packages, intended for use as positive adjustable voltage regulators. They are designed to supply up to 100 mA of load current with an output voltage adjustable over a 1.2 to 37V range. The nominal output voltage is selected by means of only a resistive divider, making the device exceptionally easy to use and eliminating the stocking of many fixed regulators.
The LM217L and LM317L are monolithic integrated circuits offered in SO‑8 and TO‑92 packages for positive adjustable voltage regulation. They provide an output voltage adjustable from 1.2 V to 37 V and can supply up to 100 mA of load current, with built‑in thermal overload and short‑circuit protection.
The datasheet includes absolute maximum ratings, electrical characteristics, mechanical dimensions, and application notes such as using the device as a precision current regulator or a floating regulator for high‑voltage applications.
| Output voltage range | 1.2 V to 37 V |
|---|---|
| Maximum output current | 100 mA (typical) |
| Line regulation (typical) | 0.01 % |
| Load regulation (typical) | 0.1 % |
| Input‑output differential voltage | 40 V |
| Power dissipation | Internally limited |
| Junction temperature range | -40 °C to 125 °C |
| Storage temperature range | -55 °C to 150 °C |
| Reference voltage | 1.25 V |
| Thermal overload protection | Yes |
| Short‑circuit protection | Yes |
The output voltage can be adjusted from 1.2 V to 37 V.
The device can tolerate up to 40 V between input and output.
It provides an internal reference voltage of 1.25 V.
Line regulation is typically 0.01 % and load regulation is typically 0.1 %.