TK71615 Просмотр технического описания (PDF) - Toko America Inc

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TK71615

LOW DROPOUT VOLTAGE REGULATOR

Toko America Inc  

TK716xx

APPLICATION INFORMATION (CONT.)

REVERSE BIAS PROTECTION

The internal reverse bias protection eliminates the

requirement for a reverse voltage protection diode. This

saves both cost and board space.

The high output voltage accuracy and low dropout voltage

are maintained when the IC is turned ON/OFF by using the

control pin as illustrated below.

VIN

VIN

VOUT

TK716xxS

GND

VIN

µ PRO

TK716xxS

VOUT

VCONT

GND

Another reverse bias protection technique is illustrated

below. The extra diode and extra capacitor are not

necessary with the TK716xx. The high output voltage

accuracy is maintained because the diode forward voltage

variations over temperature and load current have been

eliminated.

VIN

TK716xxS

VOUT

High-side switching with a FET is illustrated below. Battery

life is extended by the dropout voltage of the FET when the

input of the TK716xx is connected in front of the FET

switch.

FET SWITCHING OUTPUT

VIN

VCONT

716xx

VOUT

VOLTAGE BACKUP OPERATION (HOLDUP TIME)

HIGH-SIDE SWITCHING

High-side switching should not be implemented by an

external transistor as shown below. This results in additional

voltage drop and loss of accuracy.

CL becomes the backup power supply when the

microprocessor is reset with the voltage detector IC

simultaneously with the turning OFF the TK716xx. CL

provides the holdup time necessary to do an orderly

shutdown of the microprocessor.

VOLTAGE

REGULATOR

VDROP

ON/OFF

CONTROL

VOUT

VIN

VOLTAGE

DETECTOR IC

TK716xxS

VCONT OFF

GND

VOUT

CL

µ PRO

RESET

December 1999 TOKO, Inc.

Page 17

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