View tk712xx series datasheet:

TK712xx LOW DROPOUT REGULATOR FEATURES APPLICATIONS Low Dropout Voltage Battery Powered Systems Low Quiescent Current Portable Consumer Equipment Very Stable Output Cordless Telephones Low Noise (35 µVrms) Personal Communications Equipment Miniature Package (SOT-25) Radio Control Systems Toys Low Voltage Systems DESCRIPTION TK712xx is a low dropout, linear regulator. Since a PNP TK712xx power transistor is used, dropout voltage is very low, making it possible to maintain stable output voltage even as the battery decreases. This allows longer battery life. The TK712xx has a noise bypass pin available for noise NOISE reduction. BYPASS VIN The TK712xx is available in a miniature SOT-25 surface GND mount package. GND VOUT ORDERING INFORMATION BLOC