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              1. "
                L4970A
                10ASWITCHINGREGULATOR
                10AOUTPUTCURRENT
                5.1VTO40VOUTPUTVOLTAGERANGE
                0TO90%DUTYCYCLERANGE
                INTERNALFEED-FORWARDLINEREGULA-
                TION
                INTERNALCURRENTLIMITING
                PRECISE5.1V
                ±
                2%ONCHIPREFERENCE
                RESETANDPOWERFAILFUNCTIONS
                SOFTSTART
                INPUT/OUTPUTSYNCPIN
                UNDERVOLTAGELOCKOUTWITHHYS-
                TERETICTURN-ON
                PWMLATCHFORSINGLEPULSEPERPE-
                RIOD
                VERYHIGHEFFICIENCY
                SWITCHINGFREQUENCYUPTO500KHz
                THERMALSHUTDOWN
                CONTINUOUSMODEOPERATION
                DESCRIPTION
                TheL4970Aisastepdownmonolithicpower
                switchingregulatordelivering10Aatavoltage
                variablefrom5.1to40V.
                RealizedwithBCDmixedtechnology,thedevice
                usesaDMOSoutputtransistortoobtainveryhigh
                efficiencyandveryfastswitchingtimes.Features
                oftheL4970Aincluderesetandpowerfailformi-
                croprocessors,feedforwardlineregulation,soft
                start,limitingcurrentandthermalprotection.The
                deviceismountedina15-leadmultiwattplastic
                powerpackageandrequiresfewexternalcompo-
                nents.Efficientoperationatswitchingfrequencies
                upto500KHzallowsreductioninthesizeand
                costofexternalfiltercomponents.
                Thisisadvancedinformationonanewproductnowindevelopmentorundergoingevaluation.Detailsaresubjecttochangewithoutnotice.
                November1991
                BLOCKDIAGRAM
                Multiwatt15V
                ORDERINGNUMBER:L4970A
                MULTIPOWERBCDTECHNOLOGY
                1/21
                9uu