?006 fairchild semiconductor corporation 1 www.fairchildsemi.com f ebruary 2006 ka78RM33 rev. 1.0.4 ka78RM33 low dropout voltage regulator pa ckage dimensions ka78RM33 low dropout voltage regulator features 0.5a/3.3v output low dropout voltage regulator low dropout voltage (max. 0.6v) over current protection, thermal shutdown soa protection, short circuit protection description the ka78RM33 is a low-dropout voltage regulator suit- able for various electronic equipments. it provides con- stant 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 va r ious functions such as an over current protection, a thermal shut down and the soa (safe operating area) protection. internal block diagram packages 1 v in 3 v out gnd q1 r2 current generator thermal shutdown protection short circuit protection soa protection bandgap reference error amp. output drive r1 2 d-pak to-220 1 123 2 3 1. v in 2. gnd 3. v out
2 www.fairchildsemi.com ka78RM33 rev. 1.0.4 ka78RM33 low dropout voltage regulator absolute maximum ratings electrical characteristics (v in = 5v, i o = 0.25a, t a = 25?, unless otherwise speci?d) p arameter symbol value unit remark input voltage v in 20 v output current i o 0.5 a thermal resistance junction-air r ja 110 ?/w no heatsink power dissipation pd interally limited junction temperature tj 150 ? operating temperature t opr -25 to +125 ? p arameter symbol conditions min. typ. max. unit output voltage v out i o = 10ma 3.22 3.3 3.38 v load regulation r load 5ma < i o < 0.5a 2 20 mv line regulation r line 4.3v |