LinearLT3070可编输出线性电源稳压方案

LinearLT3070可编输出线性电源稳压方案关键词：电源管理,DC/DC转换器,LDO线性稳压器Linear公司的LT3070是5A低噪音可编输出85mV压降的线性稳压器,具有低压超快UltraFast的瞬态响应特性,0.01μF旁路电容能降低输出电压噪音到25uVRMS.数字可编输出电压从0.8V到1.8V,数字输出富余度为±1%,±3%或±5%,两个并联可输出10A电流,线路,负载和温度的调整率为+/-1%.1MHz的35dB,可用于FPGA和DSP电源,ASIC和微处理器电源,服务器和存储设备电源等.本文介绍了LT3070主要特性,方框图,0.9V5A稳压器应用电路和1.5V-1.2V线性稳压器电路,带VIOC降压控制的稳压器电路,1V/10A点负载电流共享稳压器电路以及三输出(1V/10A,1.8V/5A和1.5V/2.5A)电源电路.5A,LowNoise,ProgrammableOutput,85mVDropoutLinearRegulatorTheLT3070isalowvoltage,UltraFast™transientresponselinearregulator.Thedevicesuppliesupto5Aofoutputcurrentwithatypicaldropoutvoltageof85mV.A0.01μFreferencebypasscapacitordecreasesoutputvoltagenoiseto25μVRMS.TheLT3070’shighbandwidthpermitstheuseoflowESRceramiccapacitors,savingbulkcapacitanceandcost.TheLT3070’sfeaturesmakeitidealforhighperformanceFPGAs,microprocessorsorsensitivecommunicationsupplyapplications.Outputvoltageisdigitallyselectablein50mVincrementsovera0.8Vto1.8Vrange.Amarginingfunctionallowstheusertotolerancesystemoutputvoltageinincrementsof±1%,±3%or±5%.TheICincorporatesauniquetrackingfunctiontocontrolabuckregulatorpoweringtheLT3070’sinput.ThistrackingfunctiondrivesthebuckregulatortomaintaintheLT3070’sinputvoltagetoVOUT+300mV,minimizingpowerdissipation.InternalprotectionincludesUVLO,reverse-currentprotection,precisioncurrentlimitingwithpowerfoldbackandthermalshutdown.TheLT3070regulatorisavailableinathermallyenhanced28-lead,4mm.5mmQFNpackage.LT3070主要特性:OutputCurrent:5ADropoutVoltage:85mVTypicalDigitallyProgrammableVOUT:0.8Vto1.8VDigitalOutputMargining:±1%,±3%or±5%LowOutputNoise:25μVRMS(10Hzto100kHz)Parallelable:UseTwofora10AOutputPrecisionCurrentLimit:±10%±1%AccuracyOverLine,LoadandTemperatureStablewithLowESRCeramicOutputCapacitors(15μFMinimum)HighFrequencyPSRR:35dBat1MHzEnableFunctionTurnsOutputOn/OffnVIOCPinControlsBuckConvertertoMaintainLowPowerDissipationandOptimizeEfficiencyPWRGD/UVLOFlagCurrentLimitFoldbackProtectionThermalShutdown5mm)QFNPackage28-Lead(4mmLT3070应用:FPGAandDSPSuppliesASICandMicroprocessorSuppliesServersandStorageDevicesPostBuckRegulationandSupplyIsolation图1.LT3070方框图图2.0.9V5A稳压器应用电路图3.LT30701.5V-1.2V线性稳压器电路图4.带VIOC降压控制的LT3070稳压器电路图5.LT30701V/10A点负载电流共享稳压器电路AO-Electronics傲壹电子官网：中文网：三输出(1V/10A,1.8V/5A和1.5V/2.5A)电源电路