Texas Instruments LM22674 Handleiding

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LM22674

,

LM22674-Q1

SNVS590M–SEPTEMBER2008–REVISEDNOVEMBER2014

LM22674/-Q142V,500mASIMPLESWITCHER

®

Step-DownVoltageRegulator

withFeatures

1Features3Description

TheLM22674switchingregulatorprovidesallofthe

1

•WideInputVoltageRange:4.5Vto42V

functionsnecessarytoimplementanefficienthigh

•InternallyCompensatedVoltageModeControl

voltagestep-down(buck)regulatorusingaminimum

•StablewithLowESRCeramicCapacitors

ofexternalcomponents.Thiseasytouseregulator

incorporatesa42VN-channelMOSFETswitch

•200mΩN-ChannelMOSFET

capableofprovidingupto500mAofloadcurrent.

•OutputVoltageOptions:

Excellentlineandloadregulationalongwithhigh

-ADJ(OutputsasLowas1.285V)

efficiency(>90%)arefeatured.Voltagemodecontrol

-5.0(OutputFixedto5V)

offersshortminimumon-time,allowingthewidest

•±1.5%FeedbackReferenceAccuracy

ratiobetweeninputandoutputvoltages.Internalloop

compensationmeansthattheuserisfreefromthe

•SwitchingFrequencyof500kHz

tedioustaskofcalculatingtheloopcompensation

•–40°Cto125°COperatingJunctionTemperature

components.Fixed5Voutputandadjustableoutput

Range

voltageoptionsareavailable.Aswitchingfrequency

•PrecisionEnablePin

of500kHzallowsforsmallexternalcomponentsand

goodtransientresponse.Aprecisionenableinput

•IntegratedBoot-StrapDiode

allowssimplificationofregulatorcontrolandsystem

•IntegratedSoft-Start

powersequencing.Inshutdownmodetheregulator

•FullyWEBENCH

®

Enabled

drawsonly25µA(typ).Builtinsoft-start(500µs,typ)

savesexternalcomponents.TheLM22674alsohas

•LM22674-Q1isanAutomotiveGradeProduct

builtinthermalshutdown,andcurrentlimitingto

thatisAEC-Q100Grade1Qualified(–40°Cto

protectagainstaccidentaloverloads.

+125°COperatingJunctionTemperature)

•SOPowerPAD(ExposedPad)

TheLM22674deviceisamemberofTexas

Instruments'SIMPLESWITCHER

®

family.The

SIMPLESWITCHER

®

conceptprovidesforaneasy

2Applications

tousecompletedesignusingaminimumnumberof

•IndustrialControl

externalcomponentsandtheTIWEBENCH

®

design

•TelecomandDatacomSystems

tool.TI'sWEBENCH

®

toolincludesfeaturessuchas

externalcomponentcalculation,electricalsimulation,

•EmbeddedSystems

thermalsimulation,andBuild-Itboardsforeasy

•ConversionsfromStandard24V,12Vand5V

design-in.

InputRails

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LM22674

HSOP(8)4.89mmx3.90mm

LM22674-Q1

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

SimplifiedApplicationSchematic

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Product specificaties