TIGER ELECTRONIC CO.,LTD Product specification LM7924 3-Terminal 1A Positive Voltage Regulator GENERAL DESCRIPTION The LM7924 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 O ABSOLUTE MAXIMUM RATINGS ( Ta = 25 C) Parameter Symbol Typ Unit Input Voltage VI -40 V Output Voltage VO -24 V Peak Current IPK -2.2 A Operating Temperature Range TOPR 0~125 o Storage Temperature Range TSTG -65~150 o C C TO-220 O ELECTRICAL CHARACTERISTICS ( Ta = 25 C) (Refer to test circuit, Io = -500mA, Vi = -33V, Ci= 2.2uF, Co=1.0uF unless otherwise specified) Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Symbol VO Regline Regload IQ ΔIQ Test Conditions Min Typ Max Unit VI = -27V to -38V -23.28 -24 -24.72 V VI = -27V to -38V — -15 -480 VI = -30V to -36V — -8.0 -240 IO = -5.0mA to-1.5A — -15 -480 IO =-250mA to -750mA — -5 -240 TJ =+25 oC — -3 -6 IO = -5mA to -1A — — -0.5 VI = -27V to -38V — — -1.0 mV mV mA mA Ripple Rejection RR f = 120Hz, VO = -27V to -37V 54 60 — dB Dropout Voltage VDrop IO = -1A, TJ =+25 oC — -2 — V Short Circuit Current ISC VI = -35V, TA =+25 oC — -300 — mA Peak Current IPK TJ =+25 oC — -2.2 — A