TK112xxB

 High Voltage Precision at ± 2.0%
 Active High On/Off Control
 Very Low Dropout Voltage 80 mV at 30 mA
 Very Low Noise
 Very Small SOT-23L or SOT-89 Surface MountPackages
 Internal Thermal Shutdown
 Short Circuit Protection

 Battery Powered Systems
 Cellular Telephones
 Pagers
 Personal Communications Equipment
 Portable Instrumentation
 Portable Consumer Equipment
Radio Control Systems
 Toys
Low Voltage Systems

Supply Voltage ......................................................... 16 V
Power Dissipation SOT-23L (Note1) ................... 600 mW
Power Dissipation SOT-89 (Note1) ..................... 900 mW
Reverse Bias ............................................................ 10 V
Storage Temperature Range ................... -55 to +150 °C
Operating Temperature Range ...................-30 to +80 °C
Operating Voltage Range............................. 1.8 to 14.5 V
Junction Temperature ........................................... 150 °C

The TK112xxB is a low dropout linear regulator with a builtin 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 external capacitor can be connected to the noise bypass pin to lower the output noise level to 30 µVrms.

An internal PNP pass transistor TK112xxB is used to achieve a low dropout voltage of 80 mV (typ.) at 30 mA load current. The TK112xxB has a very low quiescent current of 170 µA at no load and 1 mA with a 30 mA load. The standby current is typically 100 nA. The internal thermal shut down circuitry limits the junction temperature to below 150 °C. The load current is internally monitored and the device will shut down in the presence of a short circuit or overcurrent condition at the output.