MaximMAX15040高效4A开关电源稳压解决方案

MaximMAX15040高效4A开关电源稳压解决方案关键词：电源管理,DC/DC转换器,Maxim公司的MAX15040高效开关电源稳压器,输出电流4A,输出电压从0.6V到0.9xVIN.器件工作电压2.4V到3.6V,具有1MHz固定频率PWM模式工作,输出电压精度±1%,主要应用在服务器电源,POL,ASIC/CPU/DSP内地和I/O电源,DDR电源,基站电源以及通信和网络设备电源等.本文介绍了MAX15040主要特性,方框图,VOUT=1.8V全陶瓷电容设计电路图以及MAX15040评估板主要特性,电路图和材料清单.TheMAX15040high-efficiencyswitchingregulatordeliversupto4Aloadcurrentatoutputvoltagesfrom0.6Vto(0.9xVIN).Thedeviceoperatesfrom2.4Vto3.6V,makingitidealforon-boardpoint-of-loadandpostregulationapplications.Totaloutput-voltageaccuracyiswithin±1%overload,line,andtemperature.TheMAX15040features1MHzfixed-frequencyPWMmodeoperation.Thehighoperatingfrequencyallowsforsmall-sizeexternalcomponents.Thelow-resistanceon-chipnMOSswitchesensurehighefficiencyatheavyloadswhileminimizingcriticalparasiticinductances,makingthelayoutamuchsimplertaskwithrespecttodiscretesolutions.Followingasimplelayoutandfootprintensuresfirst-passsuccessinnewdesigns.TheMAX15040incorporatesahigh-bandwidth(15MHz)voltage-erroramplifier.Thevoltage-modecontrolarchitectureandthevoltage-erroramplifierpermitaTypeIIIcompensationschemetoachievemaximumloopbandwidth,upto200kHz.Highloopbandwidthprovidesfasttransientresponse,resultinginlessrequiredoutputcapacitanceandallowingforallceramiccapacitordesigns.TheMAX15040featuresanoutputoverloadhiccupprotectionandpeakcurrentlimitonbothhigh-side(sourcingcurrent)andlow-side(sinkingandsourcingcurrent)MOSFETs,forultra-safeoperationsincaseofhighoutputprebias,short-circuitconditions,severeoverloads,orinconverterswithbulkelectrolyticcapacitors.TheMAX15040featuresanadjustableoutputvoltage.TheoutputvoltageisadjustablebyusingtwoexternalresistorsatthefeedbackorbyapplyinganexternalreferencevoltagetotheREFIN/SSinput.TheMAX15040offersprogrammablesoft-starttimeusingonecapacitortoreduceinputinrushcurrent.Abuilt-inthermalshutdownprotectionassuressafeoperationunderallconditions.TheMAX15040isavailableina2mmx2mm,16-bump(4x4array),0.5mmpitchWLPpackage.MAX15040主要特性:_Internal15mΩRDS(ON)MOSFETs_Continuous4AOutputCurrent_±1%Output-VoltageAccuracyOverLoad,Line,andTemperature_Operatesfrom2.4Vto3.6VSupply_AdjustableOutputfrom0.6Vto(0.9xVIN)_AdjustableSoft-StartReducesInrushSupplyCurrent_Factory-Trimmed1MHzSwitchingFrequency_CompatiblewithCeramic,Polymer,andElectrolyticOutputCapacitors_SafeStartupintoPrebiasOutput_EnableInput/Power-GoodOutput_FullyProtectedAgainstOvercurrentandOvertemperature_OverloadHiccupProtection_Sink/SourceCurrentinDDRApplications_2mmx2mm,16-Bump(4x4Array),0.5mmPitchWLPPackageMAX15040应用:ServerPowerSuppliesPoint-of-LoadASIC/CPU/DSPCoreandI/OVoltagesDDRPowerSuppliesBase-StationPowerSuppliesTelecomandNetworkingPowerSuppliesRAIDControlPowerSupplies图1.MAX15040方框图图2.MAX15040VOUT=1.8V全陶瓷电容设计电路图MAX15040评估板TheMAX15040evaluationkit(EVkit)providesaprovendesigntoevaluatetheMAX15040high-efficiency,4A,step-downregulatorwithintegratedswitches.TheEVkitispresetfor1.8Voutputatloadcurrentsupto4Afroma2.4Vto3.6Vinputsupply.TheMAX15040featuresa1MHzswitchingfrequency,whichallowstheEVkittoachieveanall-ceramiccapacitordesignandfast-transientresponses.TheEVkitachievesupto95%efficiency.TheMAX15040EVkitPCBcomeswithaMAX15040EWE+installed.MAX15040评估板主要特性:Operatesfrom2.4Vto3.6VInputSupplyAll-CeramicCapacitorDesign1MHzSwitchingFrequencyOutput-VoltageRange:0.6Vto(0.9xVIN)Lead(Pb)-FreeandRoHSCompliantProvenPCBLayoutFullyAssembledandTestedAO-Electronics傲壹电子官网：中文网：评估板元件清单(BOM):图4.MAX15040评估板元件布局图