PD97663 TM 4AHighlyIntegratedSupIRBuck IR3897 SingleInputVoltage,SynchronousBuckRegulator - 1 - FEATURES DESCRIPTION TM TheIR3897SupIRBuck isaneasytouse,fully Single5Vto21Vapplication integratedandhighlyefficientDC/DCregulator. WideInputVoltageRangefrom1.0Vto21Vwith TheonboardPWMcontrollerandMOSFETsmake externalVcc IR3897aspaceefficientsolution,providingaccurate powerdelivery. OutputVoltageRange:0.5Vto0.86Vin EnhancedLine/LoadRegulationwithFeedForward IR3897isaversatileregulatorwhichoffers ProgrammableSwitchingFrequencyupto1.5MHz programmabilityofswitchingfrequencyandinternal currentlimitwhileoperatesinwideinputandoutput InternalDigitalSoftStart/SoftStop voltagerange. EnableinputwithVoltageMonitoringCapability Theswitchingfrequencyisprogrammablefrom300kHz ThermallyCompensatedCurrentLimitwithrobust to1.5MHzforanoptimumsolution. hiccupmodeovercurrentprotection SmartInternalLDOtoimprovelightloadandfullload Italsofeaturesimportantprotectionfunctions,suchas efficiency PreBiasstartup,thermallycompensatedcurrentlimit, ExternalSynchronizationwithSmoothClocking overvoltageprotectionandthermalshutdowntogive requiredsystemlevelsecurityintheeventoffault EnhancedPreBiasStartUp conditions. PrecisionReferenceVoltage(0.5V+/0.5%)with marginingcapability VpforTrackingApplications(Source/SinkCapability APPLICATIONS +/4A) NetcomApplications IntegratedMOSFETdriversandBootstrapDiode EmbeddedTelecomSystems ThermalShutDown ServerApplications ProgrammablePowerGoodOutputwithtracking StorageApplications capability DistributedPointofLoadPowerArchitectures MonotonicStartUp o o Operatingtemp:40 C<Tj<125 C SmallSize:4mmx5mmPQFN Leadfree,HalogenfreeandRoHSCompliant BASICAPPLICATION 97 95 93 91 89 87 85 83 81 79 77 12Vin,Internal bias,Frequency 600KHz 75 73 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 4 Load Current (A) 1.2Vout 3.3Vout Figure2:IR3897Efficiency Figure1:IR3897BasicApplicationCircuit 1 JANUARY18,2013 DATASHEET Rev3.5 Efficiency (%)PD97663 TM 4AHighlyIntegratedSupIRBuck IR3897 SingleInputVoltage,SynchronousBuckRegulator - 2 - ORDERINGINFORMATION Package Tape&ReelQty PartNumber M 750 IR3897MTR1PBF IR3897 M 4000 IR3897MTRPBF PBFLeadFree TR/TR1TapeandReel MPackageType PINDIAGRAM 4mmx5mmPOWERQFN TOPVIEW o 32 CW/ JA o 2/CW JP- CB 2 JANUARY18,2013 DATASHEET Rev3.5