TK73200
TK73200 is ADJUSTABLE LOW DROPOUT REGULATOR manufactured by TOKO.
ADJUSTABLE LOW DROPOUT REGULATOR Features s Up to 5 A Output Current Capability with External PNP Transistor s Internal Short Circuit Protection s Excellent Load Regulation s CMOS/TTL-patible On/Off Switch s Internal Reverse Bias Current Protection Switch s Internal Thermal Shutdown s Wide Adjustable Output Voltage Range (2.0 V to 12.0 V) s Continuous and Pulsed Current Modes
APPLICATIONS s s s s s s s s s Battery Powered Systems Cellular/Cordless Telephones Radio Control Systems Wireless munications Systems Portable Instrumentations Portable puters Personal Digital Assistants Local Area Network (LAN) Receivers Power Recovery for Microprocessors
DESCRIPTION
The TK73200 is a controller IC for an adjustable low dropout voltage regulator. The TK73200 and the external PNP power transistor provide adjustable output voltages from 2 to 12 V and output current from 100 m A to 5 A. By utilizing an external PNP power transistor, low dropout voltage at high current can be readily achieved. The internal electronic 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 high logic level. A pin for a bypass capacitor, which connects to the internal circuitry, is provided to lower the overall output noise level. The current limit characteristics can be configured as continuous (constant current) or pulsed (cycling). An internal thermal shutdown circuit limits the junction temperatures to below 150 °C. BLOCK DIAGRAM
VIN IPK CPULSE BASE VADJ
CONTROL NOISE BYPASS CPULSE VIN
BASE
VADJ GND
ORDERING INFORMATION
TK73200M L
Tape/Reel Code Temp. Code
TAPE/REEL CODE PACKAGE CODE
L: Tape Left M: SOT23L-8
CONTROL
ON/OFF CIRCUIT
THERMAL SENSOR
Package Code
BANDGAP REFERENCE
TEMP. RANGE
C: -30 to 80 °C
NOISE BYPASS
June 1999 TOKO, Inc.
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