View lm317m datasheet:

www.fairchildsemi.com LM317M 3-Terminal 0.5A Positive Adjustable Regulator Features Description • Output Current in Excess of 0.5A The LM317M is a 3-terminal adjustable positive voltage • Output Adjustable Between 1.2V and 37V regulator capable of supplying in excess of 500mA over an • Internal Thermal Overload Protection output voltage range of 1.2V to 37V. This voltage regulator • Internal Short Circuit Current Limiting is exceptionally easy to use and requires only two external • Output Transistor Safe Area Compensation resistors to set the output voltage. • Floating Operation for High Voltage Applications D-PAK 2 1 3 1. Adj 2. Output 3. Input TO-220 12 3 Internal Block Diagram Input 3 Vin + - Protection Voltage Refe re nce Circuitry Rlimit 2 Vo Output 1 V