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KA278R51

Low Dropout Voltage Regulator

Fairchild Semiconductor 

KA278R51

Low Dropout Voltage Regulator

www.fairchildsemi.com

Features

• 2A / 5.1V Output low dropout voltage regulator

• TO220 Full-Mold package (4PIN)

• Overcurrent protection, Thermal shutdown

• Overvoltage protection, Short-Circuit protection

• With output disable function

Description

The KA278R51 is a low-dropout voltage regulator suitable

for various electronic equipments. It provide constant volt-

age power source with TO-220 4 lead full mold package.

Dropout voltage of KA278R51 is below 0.5V in full rated

current(2A). This regulator has various function such as

peak current protection, thermal shut down, overvoltage pro-

tection 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

SHSOHROTR-TCCIIRRCCUUIITT

PROTECTION

2 Vo

3

GND

©2001 Fairchild Semiconductor Corporation

Rev. 1.0.1

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