www.fairchildsemi.com
KA278R09
Low Dropout Voltage Regulator
Features
• • • • • 2A / 9V Output low dropout voltage reg...
www.fairchildsemi.com
KA278R09
Low Dropout
Voltage Regulator
Features
2A / 9V Output low dropout
voltage regulator TO220 Full-Mold package (4PIN) Overcurrent protection, Thermal shutdown Over
voltage protection, Short-Circuit protection With output disable function
Description
The KA278R09 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 KA278R09 is below 0.5V in full rated current(2A). This regulator has various function such as peak current protection, thermal shut down, over
voltage protection and output disable function.
TO-220F-4L
1
1. Vin 2. Vo 3. GND 4. Vdis
Internal Block Diagram
Q1
Vin
1
2
Vo
THERMAL SHUTDOWN
OVER
VOLTAGE 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
KA278R09
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=11V, Io=1.0A, Ta=25°C ,...