www.fairchildsemi.com
KA278R51
Low Dropout Voltage Regulator
Features
• • • • • 2A / 5.1V Output low dropout voltage ...
www.fairchildsemi.com
KA278R51
Low Dropout Voltage
Regulator
Features
2A / 5.1V 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 KA278R51 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 KA278R51 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
Q1
Vin
1
2
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. 1.0.1
©2001 Fairchild Semiconductor Corporation
KA278R51
Absolute Maximum Ratings
Parameter Input Voltage Disable Voltage Output Current Power Dissipation 1 Power Dissipation 2 Junction Temperature Operating Temperature Symbol Vin Vdis Io Pd1 Pd2 Tj Topr Value 35 35 2.0 1.5 15 +150 -20 ~ +80 Unit V V A W W °C °C Remark No Heatsink With Heatsink -
Electrical Characteristics
(Vin=7V, Io=1.0A, Ta = +25°C, unless otherwise specified) Parameter Output Voltage Load Regulation Line Regulation Ripple Rejection Ratio Dropout Voltage Disable Voltage High Disable...