HighEfficiencyVariableGateMOSFETDriver CHL8550 FEATURES DESCRIPTION IdealforServerMemoryapplicationsusing+5V TheCHL8550MOSFETdriverisahighefficiencygatedriver whichcanswitchbothhighsideandlowsideNchannel SeparateHVCCandLVCCcapableofdrivevoltages externalMOSFETsinasynchronousbuckconverter.Itis from4.0to13.2Vforoptimalsystemefficiency intendedforusewithIRDigitalPWMcontrollerstoprovide Adjustablethermalwarningflagforphaseby atotalvoltageregulator(VR)solutionfortodaysadvanced phasethermalprotection computingapplications. Largedriversdesignedtodrive3nFin<10nswith anyvoltagefrom5Vto12V(typ)suppliedtothe TheCHL8550driveriscapableofrapidlyswitchinglarge HVCCandLVCCpins MOSFETswithlowR andlargeinputcapacitanceused dson Lowsidedriver2Asource/4Asink inhighefficiencydesigns.Itisuniquelydesignedto Highsidedriver2Asource/2Asink operatefroma5Vsource,minimizingloadcurrent. Transitionstimes&Propagationdelays<10ns ItalsohasseparateHVCCandLVCCdriveinputs,capable of4.0Vto13.2Voperation.UsedinconjunctionwithIRs Integratedbootstrapdiode VariableGateDrivecontrollerfeature,ora5Vstandby Capableofhighswitchingfrequenciesfrom200kHz sourceinsleepmode,maximumpowerstageefficiency uptogreaterthan1MHz canbeattained. CompatiblewithIRspatentedActiveTriLevel (ATL)PWMforfastestresponsetotransient TheCHL8550hasauniquecircuitwhichmaintainsdrive overshoot strengthtotheexternalMOSFETsregardlessofthedrive voltage,insuringfastswitchingevenat5Vasthedrive Nonoverlapandundervoltageprotection voltage.Theintegratedbootdiodereducesexternal Thermallyenhanced10pinDFNpackage componentcount.TheCHL8550alsofeaturesanadaptive nonoverlapcontrolforshootthroughprotection. LeadfreeRoHScompliantpackage LowQuiescentpowertooptimizeefficiency TheCHL8550isconfiguredtodriveboththehighand lowsideswitchesfromthepatentedIRfastActiveTriLevel (ATL)PWMsignal,whichwilloptimizetheturnofftimeof APPLICATIONS individualphases,optimizingtransientperformance. MultiphasesynchronousbuckconverterforServer CPUsandDDRMemoryVRsolutions HighefficiencyandcompactVRM OptimizedforSleepstateS3systemsusing+5VSB NotebookComputerandGraphicsVRsolutions BASICAPPLICATION PINDIAGRAM Figure1:CHL8550BasicApplicationCircuit Figure2:CHL8550PackageTopView 1 December6,2011 FINAL V1.05HighEfficiencyVariableGateMOSFETDriver CHL8550 ORDERINGINFORMATION CHL8550 Package Tape&ReelQty PartNumber DFN 3000 CHL8550CRT TTapeandReel RPackageType(DFN) COperatingTemperature (CommercialStandard) Figure3:CHL8550PinDiagramEnlarged 2 December6,2011 FINAL V1.05