Texas Instruments LM3940 Handleiding

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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LM3940

SNVS114G–MAY1999–REVISEDFEBRUARY2015

LM39401-ALow-DropoutRegulatorfor5-Vto3.3-VConversion

1

1Features

1

•InputVoltageRange:4.5Vto5.5V

•OutputVoltageSpecifiedoverTemperature

•ExcellentLoadRegulation

•Specified1-AOutputCurrent

•RequiresonlyOneExternalComponent

•Built-inProtectionagainstExcessTemperature

•Short-CircuitProtected

2Applications

•LaptopandDesktopComputers

•LogicSystems

3Description

TheLM3940isa1-Alow-dropoutregulatordesigned

toprovide3.3Vfroma5-Vsupply.

TheLM3940isideallysuitedforsystemswhich

containboth5-Vand3.3-Vlogic,withprimepower

providedfroma5-Vbus.

BecausetheLM3940isatruelowdropoutregulator,

itcanholdits3.3-Voutputinregulationwithinput

voltagesaslowas4.5V.

TheTO-220packageoftheLM3940meansthatin

mostapplicationsthefull1Aofloadcurrentcanbe

deliveredwithoutusinganadditionalheatsink.

ThesurfacemountDDPAK/TO-263packageuses

minimumboardspace,andgivesexcellentpower

dissipationcapabilitywhensolderedtoacopper

planeonthePCboard.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LM3940

SOT-223(4)6.50mmx3.50mm

DDPAK/TO-263(3)10.18mmx8.41mm

TO-220(3)14.986mmx10.16mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

SimplifiedSchematic

*Requiredifregulatorislocatedmorethan1inchfromthepowersupplyfiltercapacitororifbatterypowerisused.

**SeeApplicationandImplementation.

Product specificaties