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.
The document describes the LM317 family of adjustable 3-terminal positive voltage regulators capable of supplying in excess of 1.5 A over an output voltage range of 1.2 V to 37 V. These devices are designed for easy use, requiring only two external resistors to set the output voltage and featuring internal current limiting, thermal shutdown, and safe area compensation.
| Output Current | In excess of 1.5 A |
|---|---|
| Output Voltage Range | 1.2 V to 37 V |
| Reference Voltage (Typ) | 1.25 V |
| Maximum Input-Output Voltage Differential | 40 Vdc |
| Operating Junction Temperature Range | -55 to +150 °C (NCV317) |
The typical reference voltage (Vref) is 1.25 V.
The device is available in Surface Mount D2PAK-3 and Standard 3-Lead Transistor Package.
Yes, it employs internal current limiting, thermal shutdown, and safe area compensation.