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KA378R12
Low Dropout Voltage Regulator
www.fairchildsemi.com
Features
• 3A/12V 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 KA378R12 is a low-dropout voltage regulator suitable
for various electronic equipments. It provide constant
voltage power source with TO-220 4 lead full mold package.
Dropout voltage of KA378R12 is below 0.5V in full rated
current(3A). This regulator has various function 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
1.4V
OUTPUT
- ON/ OFF
+
1
1. Vin 2. Vo 3. GND 4. Vdis
OVERVOLTAGE
PROTECTION
-
+
SOA PROTECTION
SHSOHROTR-TCCIIRRCCUUITIT
PROTECTION
Q1
R1
R2
2 Vo
©2005 Fairchild Semiconductor Corporation
3
GND
Rev. 1.0.3
