SLVA343A.PDF datasheet pdf

ApplicationReport SLVA343A– June2009– RevisedMay2010 MediumIntegratedPowerSolutionUsinga DualDC/DC ConverterandanLDO AmbreeshTripathi..........................................................................PMP- DC/DCLow-PowerConverters ABSTRACT ThisreferencedesignisintendedforusersdesigningwiththeTMS320C6742,TMS320C6746, TMS320C6748,orOMAP-L138processor.Usingsequencedpowersupplies,thisreferencedesign describesa systemhavinga 3.3-Vinputvoltageanda high-efficiencydc/dcconverterwithintegrated FETsfora small,simpledesign. Sequencedpowersupplyarchitecturesarebecomingcommonplaceinhigh-performancemicroprocessor anddigitalsignalprocessor(DSP)systems.Tosavepowerandincreaseprocessingspeeds,processor coreshavesmallergeometrycellsandrequirelowersupplyvoltagesthanthesystembusvoltages.Power managementinthesesystemsrequiresspecialattention.Thisapplicationreportaddressesthesetopics andsuggestssolutionsforoutputvoltagesequencing. Contents 1Introduction..................................................................................................................2 2PowerRequirements.......................................................................................................2 3Features......................................................................................................................3 4BillofMaterials..............................................................................................................6 ListofFigures 1PMP4978ReferenceDesignSchematic.................................................................................4 2OptionalCircuitforDVDD_A,DVDD_BandDVDD_C.................................................................5 3Sequencingin Start-upWaveform........................................................................................7 4EfficiencyV OUT2 = 1.8V.....................................................................................................7 5EfficiencyV OUT1 = 1.1V.....................................................................................................7 ListofTables 1PowerRequirements.......................................................................................................2 2PMP4978BillofMaterials.................................................................................................6 EasyScaleis a trademarkofTexasInstruments. 1 SLVA343A– June2009– RevisedMay2010MediumIntegratedPowerSolutionUsinga DualDC/DCConverterandanLDO Copyright© 2009–2010,TexasInstrumentsIncorporated