HighlyIntegrated35ASingleinputVoltage, iP1837 SynchronousBuckRegulator FEATURES DESCRIPTION TM Wideinputapplication1.5V16V TheiP1837iPOWIR isaneasytouse,fullyintegrated andhighlyefficientDC/DCregulator.TheonboardPWM Single3.3Vorsingle5Vapplication controllerandMOSFETsmakeiP1837aspaceefficient OutputVoltageRange:0.6Vto0.75*Vin solution,providingaccuratepowerdeliveryforlowoutput voltageandhighcurrentapplications. 0.5%accurateReferenceVoltage ProgrammableSwitchingFrequencyupto1.5MHz iP1837isaversatileregulatorwhichoffersprogrammability ProgrammableSoftStart ofswitchingfrequencyandcurrentlimitwhileoperatingin wideinputandoutputvoltagerange. EnableinputwithVoltageMonitoringCapability RemoteSenseAmplifierwithTrueConverter Theswitchingfrequencyisprogrammablefrom250kHzto VoltageSensing 1.5MHzforanoptimumsolution. ThermallycompensatedHiccupMode Italsofeaturesimportantprotectionfunctions,suchas OverCurrentProtection PreBiasstartup,hiccupcurrentlimitandthermal Overvoltageprotection shutdowntogiverequiredsystemlevelsecurityinthe PreBiasStartup eventoffaultconditions. BodyBrakingtoimprovetransient IntegratedMOSFETdriversandBootstrapdiode APPLICATIONS o o Operatingtemp:40 C<Tj<125 C ServerApplication ThermalShutDown NetcomApplications PowerGoodOutputwithWindowComparator EmbeddedTelecomSystems SmallSize7.7mmx7.7mmLGA DistributedPointofLoadPowerArchitectures HalogenFree,PbFreeandRoHSCompliant BASICAPPLICATION 97 96 95 94 93 92 91 Vin=12V Vcc=3.3V 90 Room Temperature 200 LFM airflow 89 iP1837 Includes biasing loss as well as inductor losses and stray PCB losses 88 87 3.5 7 10.5 14 17.5 21 24.5 28 31.5 35 Iout (A) Vo=3.3V Vo=1.8V Figure2:iP1837Efficiency Figure1:iP1837BasicApplicationCircuit 1 March5,2012 V1.26 97600 Efficiency (%)HighlyIntegrated35ASingleinputVoltage, iP1837 SynchronousBuckRegulator PINDIAGRAM LGND PIN 1 FB SS Vin PIN 17 PIN 6 PIN 5 COMP VOSM PIN 2 PIN 16 PIN 7 VOSO VOSP SW PIN 15 PIN 8 RT 0 =2.3 C/W j-pcb PIN 9 PIN 3 EN VCC PIN 14 PIN 10 PGD OCSET PGND PIN 13 PIN 11 PVCC BiasGND PIN 12 PIN 4 Figure3:iP1837PackageBottomView 7.65mmx7.65mmLGA ORDERINGINFORMATION Package TapeandReelQty PartNumber LGA 2000 iP1837TRPbF (7.65mmx7.65mmbody) 2 March5,2012 V1.26 97600