View lm337 datasheet:

www.fairchildsemi.com LM337 3-Terminal 1.5A Negative Adjustable Regulator Features Description • Output current in excess of 1.5A The LM337 is a 3-terminal negative adjustable regulator. It • Output voltage adjustable between -1.2V and - 37V supplies in excess of 1.5A over an output voltage range of • Internal thermal overload protection -1.2V to - 37V. This regulator requires only two external • Internal short circuit current limiting resistor to set the output voltage. Included on the chip are • Output transistor safe area compensation current limiting, thermal overload protection and safe area • Floating operation for high voltage applications compensation. • Standard 3-pin TO-220 package TO-220 1 1. Adj 2. Input 3. Output Internal Block Diagram Vadj 1 3 Output Volta