View tk115xx series datasheet:

TK115xx VOLTAGE REGULATOR WITH ON/OFF SWITCH FEATURES APPLICATIONS Low Dropout Voltage Cordless Telephones Pass Transistor Terminals Available Pagers Very Low Standby Current ( ON, No Load) Battery Powered Systems Very Low (<200 nA) Current in OFF Mode Personal Communications Equipment Low Output Noise Portable Instrumentation Internal Thermal Shutdown Radio Control Systems Short Circuit Protection Toys Available on Tape and Reel Low Voltage Systems Portable Consumer Equipment DESCRIPTION The TK115xx series devices are low power, linear regu- An internal thermal shutdown circuit limits the junction lators with electronic ON/OFF switches. Both active HIGH temperature to below 150 °C. The load current is internally and active LOW control pins are provided. monitor