KA278R12

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...