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1、A4988DMOSMicrosteppingDriverwithTranslatorandOvercurrentProtectionFeaturesandBenefitsDescription▪LowRds(on)outputsTheA4988isacompletemicrosteppingmotordriverwith▪Automaticcurrentdecaymodedetection/selectionbuilt-intranslatorforeasyoperation.Itisdesignedtooperate▪
2、Mixedandslowcurrentdecaymodesbipolarsteppermotorsinfull-,half-,quarter-,eighth-,and▪Synchronousrectificationforlowpowerdissipationsixteenth-stepmodes,withanoutputdrivecapacityofupto▪InternalUVLO35Vand±2A.TheA4988includesafixedoff-timecurrent▪Crossover-currentprot
3、ectionregulatorwhichhastheabilitytooperateinslowormixed▪3.3and5Vcompatiblelogicsupplydecaymodes.▪Thermalshutdowncircuitry▪Short-to-groundprotectionThetranslatoristhekeytotheeasyimplementationofthe▪ShortedloadprotectionA4988.SimplyinputtingonepulseontheSTEPinputdr
4、ives▪Fiveselectablestepmodes:full,1/2,1/4,1/8,and1/16themotoronemicrostep.Therearenophasesequencetables,high-frequencycontrollines,orcomplexinterfacestoprogram.TheA4988interfaceisanidealfitforapplicationswhereaPackage:complexmicroprocessorisunavailableorisoverbur
5、dened.28-contactQFNDuringsteppingoperation,thechoppingcontrolintheA4988withexposedthermalpadautomaticallyselectsthecurrentdecaymode:slowormixed.In5mm×5mm×0.90mm(ETpackage)mixeddecaymode,thedeviceissetinitiallytoafastdecayforaproportionofthefixedoff-time,thentoasl
6、owdecayfortheremainderoftheoff-time.Mixeddecaycurrentcontrolresultsinreducedaudiblemotornoise,increasedstepaccuracy,andreducedpowerdissipation.NottoscaleContinuedonthenextpage…TypicalApplicationDiagramV0.1µF0.1µFDD0.22µFVREGROSCCP1CP2VCPVBB10.22µFVDD100µFVBB25kΩM
7、icrocontrollerorSLEEPOUT1AControllerLogicA4988OUT1BSTEPSENSE1MS1MS2MS3OUT2ADIROUT2BENABLESENSE2RESETVREFGNDGND4988-DS,Rev.6DMOSMicrosteppingDriverwithTranslatorA4988andOvercurrentProtectionDescription(continued)Internalsynchronousrectificationcontrolcircuitryispr
8、ovidedTheA4988issuppliedinasurface-mountQFNpackage(ET),5mmtoimprovepowerdissipationduringPWMoperation.Internal×5mm,withanominaloverallpackageheightof0.90mmanda
