www.fairchildsemi.com
KA278R12
Low Dropout Voltage Regulator
Features
• • • • • 2A / 12V Output low dropout voltage re...
www.fairchildsemi.com
KA278R12
Low Dropout Voltage
Regulator
Features
2A / 12V 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 KA278R12 is a low-dropout voltage
regulator suitable for various electronic equipments. It provide constant voltage power source with TO-220F-4 lead full mold package. Dropout voltage of KA278R12 is below 0.5V in full rated current(2A). This
regulator has various function such as peak current protection, thermal shut down, overvoltage protection and output disable function.
TO-220F-4L
1
1. Vin 2. Vo 3. GND 4. Vdis
Internal Block Diagram
Vin 1 Q1 2 Vo
THERMAL SHUTDOWN
OVERVOLTAGE PROTECTION
BANDGAP REFERENCE
+ R1
SOA PROTECTION HIGH / LOW Vdis 4 + OUTPUT ON / OFF
1.4V
SHORT-CIRCUIT SHORTCIRCUIT
PROTECTION
R2
3 GND
Rev. 1.0.2
©2001 Fairchild Semiconductor Corporation
KA278R12
Absolute Maximum Ratings
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) Thermal Shutdown Temperature Symbol Vin Vdis Io Pd1 Pd2 Tj Topr Rθjc Rθja Ttsd Value 35 35 2.0 1.5 15 150 -20~80 2.9 48.51 150 Unit V V A W W °C °C °C/W °C/W °C Remark No Heatsink With Heatsink -
Electrical Characteristics
(Vin=15V, Io=1.0A, Ta=25°C , un...