KA278RA05

www.fairchildsemi.com KA278RA05 Low Dropout Voltage Regulator (Fixed & Adjustable) Features Nominal 5V output without adjusting Output Adjustable Between 1.25V and 32V 2A Output low dropout voltage regulator TO220 Full-Mold package (4PIN) Overcurrent protection, Thermal shutdown Overvoltage protection, Short-Circuit protection Description The KA278RA05 is a low-dropout voltage regulator suitable for various electronic equipments. It provides constant voltage power source with TO-220F-4 lead full mold package. Dropout voltage of KA278RA05 is below 0.5V in full rated current(2A). This regulator has various function such as peak current protection, thermal shut down and over voltage protection. TO-220F-4L 1 1. Vin 2. VO 3. GND 4. Vadj Internal Block Diagram Q1 Vin 1 2 Vo THERMAL SHUTDOWN OVERVOLTAGE PROTECTION BANDGAP REFERENCE + Rin R1 1.8kΩ SOA PROTECTION 4 Vadj SHORT-CIRCUIT SHORTCIRCUIT PROTECTION R2 Rref0.6kΩ 3 GND Rev. 1.0.2 ©2001 Fairchild Semiconductor Corporation KA278RA05 Absolute Maximum Ratings Parameter Input Voltage Output Current Power Dissipation 1 Power Dissipation 2 Junction Temperature Operating Temperature Symbol Vin IO Pd1 Pd2 Tj Topr Value 35 2.0 1.5 15 150 -20 ~ 80 Unit 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 Quiescent Current Refer...