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
1
1. Vin 2. V
O
3. GND 4. Vdis
Internal Block Diagram
Q1
2
Vin
1
Vo
THERMAL SHUTDOWN
OVERVOLTAGE
PROTECTION
BANDGAP REFERENCE
-
+
R1
SOA PROTECTION
HIGH / LOW
Vdis
4
-
+
OUTPUT
ON / OFF
R2
1.4V
SHORT-CIRCUIT
SHORTCIRCUIT
PROTECTION
3
GND
Rev. 1.0.0
©2003
Fairchild Semiconductor Corporation
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
