KA78RM33TSTU

KA78RM33 Low Dropout Voltage Regulator Features Description ■ 0.5A/3.3V Output Low Dropout Voltage Regulator The KA78RM33 is a low-dropout voltage regulator suitable for various electronic equipments. It provides constant voltage power source with surface mount type package (D-PAK). The dropout voltage of KA78RM33 is below 0.6V in full rated current(0.5A). This regulator has various functions such as an over current protection, a thermal shut down and the SOA (Safe operating Area) protection. PACKAGE DIMENSIONS ■ Low Dropout Voltage (Max. 0.6V) ■ Over Current Protection, Thermal Shutdown ■ SOA Protection, Short Circuit Protection Internal Block Diagram Q1 VIN 1 Current Generator Thermal Shutdown Protection 3 VOUT SOA Protection Short Circuit Protection Bandgap Reference R1 Error Amp. Output Drive R2 GND 2 Packages D-PAK TO-220 2 1 3 1 2 3 1. VIN ©2006 Fairchild Semiconductor Corporation KA78RM33 Rev. 1.0.4 2. GND 3. VOUT 1 www.fairchildsemi.com KA78RM33 Low Dropout Voltage Regulator February 2006 Parameter Symbol Value Unit Remark Input Voltage VIN 20 V – Output Current IO 0.5 A – °C/W No Heatsink RθJA 110 Power Dissipation Pd Interally limited – – Junction Temperature Tj 150 °C – TOPR -25 to +125 °C – Thermal Resistance Junction-Air Operating Temperature Electrical Characteristics (VIN = 5V, IO = 0.25A, TA = 25°C, unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit 3.22 3.3 3.38 V 5mA < IO < 0.5A – 2 20 mV 4.3V