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KA78R33CYDTU

1A Output Low Dropout Voltage Regulators

Fairchild Semiconductor 

www.fairchildsemi.com

KA78RXXC-Series

1A Output Low Dropout Voltage Regulators

Features

• 1A/3.3V, 5V, 8V, 9V, 12V, 15V output low dropout

voltage regulator

• TO-220 full-mold package (4pin)

• Overcurrent protection, thermal shutdown

• Overvoltage protection, short circuit protection

• With output disable function

Description

The KA78RXXC is a low-dropout voltage regulator suitable

for various electronic equipments.

It provides constant voltage power source with TO-220-4

lead full mold package. Dropout voltage of KA78RXXC is

below 0.5V in full rated current(1A).

This regulator has various functions such as peak current

protection, thermal shut down, overvoltage protection and

output disable function.

TO-220F-4L

Internal Block Diagram

Vin 1

THERMAL SHUTDOWN

BANDGAP REFERENCE

HIGH / LOW

Vdis 4

-

+

OUTPUT

ON / OFF

1.4V

1

1. Vin 2. VO 3. GND 4. Vdis

OVERVOLTAGE

PROTECTION

-

+

SOA PROTECTION

Q1

R1

R2

SHSOHORRT-TCCIIRCUUIITT

PROTECTION

2 Vo

3

GND

©2003 Fairchild Semiconductor Corporation

Rev. 1.0.0

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