The LM317 is an adjustable 3-terminal positive voltage regulator capable of supplying in excess of 1.5 A over an output voltage range of 1.2 V to 37 V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blow-out proof. The LM317 serves a wide variety of applications including local, on card regulation. This device can also be used to make a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM317 can be used as a precision current regulator.
This document provides technical specifications for the Motorola LM317, a three-terminal adjustable output positive voltage regulator. It is capable of supplying in excess of 1.5 A over an output voltage range of 1.2 V to 37 V.
The datasheet details maximum ratings such as input-output voltage differential and power dissipation for various packages (Case 221A, Case 936). It also lists electrical characteristics including line regulation, load regulation, reference voltage, and thermal resistance.
| Output Current | In excess of 1.5 A |
|---|---|
| Output Voltage Range | 1.2 V to 37 V |
| Input-Output Voltage Differential | 40 Vdc |
| Reference Voltage (Typ) | 1.25 V |
| Operating Junction Temperature Range (T Package) | -40 to +125 °C |
The typical reference voltage is 1.25 V.
The device is available in Surface Mount D2PAK and Standard 3-Lead Transistor packages.
Yes, it employs internal current limiting, thermal shutdown, and safe area compensation.