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KA278R12

Fairchild
Part Number KA278R12
Manufacturer Fairchild
Description Low Dropout Voltage Regulator
Published Apr 25, 2005
Detailed Description www.fairchildsemi.com KA278R12 Low Dropout Voltage Regulator Features • • • • • 2A / 12V Output low dropout voltage re...
Datasheet PDF File KA278R12 PDF File

KA278R12
KA278R12


Overview
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 , unless otherwise specified) Parameter Output Voltage Load Regulation Line Regulation Ripple Rejection Ratio Dropout Voltage Disable Voltage High Disable Voltage Low Disable Bias Current High Disable Bias Current Low Quiescent Current Symbol Vo Rload Rline RR Vdrop VdisH VdisL IdisH IdisL Iq 5mA < Io < 2A 13V < Vin < 29V note1 Io = 2A Output Active Output Disabled Vdis = 2.
7V Vdis = 0.
4V Io = 0A Conditions Min.
11.
7 45 2.
0 Typ.
12 0.
1 0.
5 55 Max.
12.
3 2.
0 2.
5 0.
5 0.
8 20 -0.
4 10 Unit V % % dB V V V ...


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