View tk111xxm-series datasheet:

TK111xxM VOLTAGE REGULATOR WITH ON/OFF SWITCH FEATURES APPLICATIONS High Voltage Precision at ± 2.0% or ± 60 mV Battery Powered Systems Active High On/Off Control Cellular Telephones Very Low Dropout Voltage (85 mV at 30 mA) Pagers Very Low Noise Personal Communications Equipment Miniature Package (SOT-23L-6) Portable Instrumentation Internal Thermal Shutdown Portable Consumer Equipment Short Circuit Protection Radio Control Systems Excellent Ripple Rejection (70 dB @ 1 kHz) Toys Reverse Bias Protection DESCRIPTION The TK111xxM is a low dropout linear regulator with a built- in electronic switch. The internal switch can be controlled by TTL or CMOS logic levels. The device is in the “on” state when the control pin is pulled to a logic high level. An TK111