TIGER ELECTRONIC CO.,LTD Product specification LM7818J 3-Terminal 1A Positive Voltage Regulator GENERAL DESCRIPTION The LM7818 series of three terminal positive regulators are available in the TO-220 package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shut down and safe operating area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 1A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents. ABSOLUTE MAXIMUM RATINGS ( Ta = 25 C) O Parameter Symbol Typ Unit Input Voltage VI 35 V Output Voltage VO 18.0 V Peak Current IPK 2.2 A Operating Temperature Range TOPR 0~125 o Storage Temperature Rang TSTG -65~150 o C C TO-252 e ELECTRICAL CHARACTERISTICS ( Ta = 25 C) O (Refer to test circuit, Io = 500mA, Vi = 27V, Ci= 0.33uF, Co=0.1uF unless otherwise specified) Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Symbol VO Regline Regload IQ Test Conditions Min Typ Max Unit VI = 21V to 33V 17.46 18.0 18.54 V VI = 21V to 33V — 15 360 VI = 24V to 30V — 5 180 IO = 5.0mA to1.5A — 15 360 IO =250mA to 750mA — 5 180 TJ =+25 oC — 5.2 8 mA mV mV Ripple Rejection RR f = 120Hz, VO = 22V to 32V 53 69 — dB Dropout Voltage VDrop IO = 1A, TJ =+25 oC — 2 — V Output Resistance rO f = 1KHz — 0.022 — Ω Short Circuit Current ISC VI = 35V, TA =+25 oC — 250 — mA Peak Current IPK TJ =+25 oC — 2.2 — A