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KA78RXXC-Series
1A Output Low Dropout Voltage Regulators
Features
• 1A/3.3V, 5V, 8V, 9V, 12V, 15V...
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
Vdis
HIGH / LOW 4
+
OUTPUT ON / OFF
1.4V
1 1. Vin 2. VO 3. GND 4. Vdis
OVERVOLTAGE PROTECTION
+
SOA PROTECTION
Q1 R1
SHSOHORRT-TCCIIRCCUUIITT PROTECTION
R2
2 Vo
©2011 Fairchild Semiconductor Corporation
3 GND
Rev. 1.0.1
KA78RXXC-SERIES
Absolute Maximum Ratings
KA78RXXC Parameter Input voltage Disable voltage Output current Power dissipation 1 Power dissipation 2 Junction temperature Operating temperature Thermal resistance, junction-to case (Note2) Thermal resistance, junction-to-air (Note2)
Symbol Vin Vdis Io Pd1 Pd2 Tj Topr Rθjc Rθja
Value 35 35 1.0 1.5 15
+150 -20 ~ +80
4.31 48.83
Unit V V A W W °C °C
°C/W °C/W
Remark -
No heatsink With heatsink
-
2
Electrical Characteristics
(...