标签: step-down

LTC3413是一款单芯片、同步降压DC/DC转换器，需要高达±3A输出电流的DDR内存终端应用。其高转换开关频率和内部低RDS功率开关使其提供了紧凑、高效的解决方案。advertisement3A,2MHzMonolithicSynchronousStep-DownRegulatorProvidesaCompactSolutionforDDRMemoryTermination……

LTC3411和LTC3412是高性能、单芯片、同步降压DC/DC转换器，适用于需要1.25A至2.5A输出电流应用。其高开关频率和内部低RDS功率开关实现了紧凑、高效的电源解决方案。advertisement4MHzMonolithicSynchronousStep-DownRegulatorsBringHighEfficiencytoSpace-SensitiveApplications……

高压双极性单芯片降压转换器通常用于高效大电流输出中。但超过1mA的静态电流在轻负载小电流的电池供电应用中不受欢迎。LT1976在极宽输入电压范围内，不论高于或低于输入，设计用于全电流电平内的效率优化。微功耗偏置电流和突发工作模式使其在零负载12V输入时只消耗100μA电流。advertisement60VStep-DownDC/DCConverterHasOnly100AQuiescentCurrent……

宽输入范围、小尺寸、稳定设计的LT3493和LT3481，是一适用于众多降压应用的芯片。其具有的高输入电压，高电源转换能力和极佳的热传导封装使其集多种功能于一身。advertisementTinyMonolithicStep-DownRegulatorsOperatewithWideInputRange……

在电池供电系统中常需要低待机功耗，以汽车系统为例，一般要求即使在无负载条件下依然能够保持输出电压的稳定，LTC3800可实现高效简洁的电源供电系统，而只需不多的外部元件。HighVoltageCurrentModeStep-DownConverterwithLowPowerStandbyCapability……

LTC3437宽输入范围、低静态电流、稳健设计和小热效封装使其成为汽车、宽输入电压、低静态电流应用的理想解决方案。advertisementMonolithicStep-DownRegulatorWithstandsTheRigorsofAutomotiveEnvironmentsandConsumesOnly100AofQuiescentCurrent……

LT3506和LT3506A提供低至0.8V输出电压和1.6A的电流。两路反相开关减少了输入电压纹波，消除EMI。PG、VC和RUN/SS引脚使供电排序简化，两种封装选择和两种开关频率选择允许优化多种应用的解决方案。advertisementDualMonolithicStep-DownSwitchingRegulatorProvides1.6AOutputswithReducedEMIandVOUTasLowas0.8VDesignNote404Hua(Walker)BaiIntroductiontheLT3506andtheLT3506Ahave0.8VhighaccuracyElectronicdevicesarebecomingsmallerwhilethepowervoltagereferences.requirementsareincreasingtosatisfyevermorefunc-TypicalLT3506AandLT3506Applicationstionality.Topreservepowerandmanageheat,switching……

LTC3740能工作于低僌电压，提高了宽输入电压范围的空间和节省成本的解决方案。LTC3740是一款具有多功能平台，可构成DC/DC转换器，在负载变动大范围内用极少的外部元件并保持高效率。集成的降压调整器实现了真正的单电源工作，输入电压可低至2.2V。Step-DownSynchronousControllerOperatesfromInputsDownto2.2VDesignNote443WeiGuIntroductiontransientresponseandverylowon-times.Furthermore,Manytelecommunicationsandcomputingapplicationsapowergoodsignalisavailabletomonitortheoutputneedhighefciencystep-downDC/DCconvertersthatvoltage.ThetrackingcapabilitybuiltintoXFERcanbecanoperatefromaverylowinputvoltage.ThehighusedtoimplementcontroloftheoutputvoltagewhenoutputpowersynchronouscontrollerLT3740isidealrampingupandrampingdown.Iflessthan0.8Visappliedfortheseapplications,convertinginp……

Manytelecommunicationsandcomputingapplicationsneedhighefficiencystep-downDC/DCconvertersthatcanoperatefromaverylowinputvoltage.ThehighoutputpowersynchronouscontrollerLT3740isidealfortheseapplications,convertinginputsuppliesrangingfrom2.2Vto22Vtooutputsaslowas0.8Vwithloadcurrentsfrom2Ato20A.Applicationsincludedistributedpowersystems,point-of-loadregulationandconversionoflogicsupplies.Step-DownSynchronousControllerOperatesfromInputsDownto2.2VDesignNote443WeiGuIntroductiontransientresponseandverylowon-times.Furthermore,Manytelecommunicationsandcomputingapplicationsapowergoodsignalisavailabletomonitortheoutputneedhighefciencystep-downDC/DCconvertersthatvoltage.ThetrackingcapabilitybuiltintoXFERcanbecanoperatefromaverylowinputvoltage.ThehighusedtoimplementcontroloftheoutputvoltagewhenoutputpowersynchronouscontrollerLT3740isidealrampingupandrampingdown.Iflessthan0.8Visappliedfortheseapplications,convertinginp……

TheLTC3562quadoutputstep-downregulatorisdesignedformulticorehandheldmicroprocessorapplicationsthatoperatefromasingleLi-Ionbattery.Itsfourmonolithic,highefficiencybuckregulatorssupportIntel’smobileCPUP-StateandC-Stateenergysavingoperatingmodes.TheoutputvoltagesareindependentlycontrollableviaI2C,andeachoutputcanbeindependentlystartedandshutdown.Designerscanchoosefrompowersavingpulse-skippingmodeorBurstModeoperation,orselectlownoiseLDOmode.Thespace-savingLTC3562isavailableina3mm×3mmQFNpackageandrequiresfewexternalcomponents.CompactI2C-ControllableQuadSynchronousStep-DownDC/DCRegulatorforPower-ConsciousPortableProcessorsDesignNote442JimDrewIntroductionThe“TypeB”regulators(R600BandR400B)donotrequireTheLTC3562quadoutputstep-downregulatorisdesignedexternalprogrammingresistorsbecausetheresistorsareformulticorehandheldmicroprocessorapplicationsthatintegratedon-chip.ThevaluesoftheinternalfeedbackoperatefromasingleLi-Ionbattery.Itsfourmonolithic,highresistorsareadjustedthroughtheI2Cport,resultinginefciencybuckregulatorssupportIntel’smobileCP……

Typicalindustrialandautomotiveapplicationsrequiremultiplehighcurrent,lowvoltagepowersuppliestodriveeverythingfromdiskdrivestomicroprocessors.TheLT®3507triplestep-downconverterfitseasilyintotheseapplications.Itissimpleandcompactcomparedtomulti-chipsolutions.CompactTripleStep-DownRegulatorOffersLDODriverandOutputTrackingandSequencing……

在降压器中的基本要求是降低输入电压。虽然线性稳压器可以满足这一需求，但并不能实现高效。基于“BUCK”的开关整流器现在已经出现并应用了一段时间，便利，易于应用的器件使实际电路更易实现。文中对降压开关整流器的实现作了阐述。ApplicationNote35August1989Step-DownSwitchingRegulatorsJimWilliamsAsubstantialpercentageofregulatorrequirementslostinthisvoltage-to-current-to-magneticeld-to-cur-involvesteppingdowntheprimaryvoltage.Althoughrent-to-charge-to-voltageconversion.Inpractice,thelinearregulatorscandothis,theycannotachievethecircuitelementshavelosses,butstep-downefciencyisefciencyofswitchingbasedapproaches1.Thetheorystillhigherthanwithinherentlydissipative(e.g.,voltagesupportingstep-down(“buck”)switchingreg……

本文介绍了同步降压器LTC3890的工作原理，电路性能和外围元件选择依据。Step-DownConverterDelivers25Aat12VOUTfromInputsUpto60VDesignNote1024VictorKhasievIntroductionHighEfficiency2-PhaseConverterProduces12VTheLTC3890(dualoutputs)andLTC3891(singleat25Aoutput)step-downDC/DCcontrollersdirectlyacceptFigure1showstheLTC3890ina2-phasesingleoutputinputsfrom4Vto60V.Thiswideinputrangecoversstep-downconverterconfigurationthatdelivers25Ainputvoltagesforsingleordoublebatteryautomotiveat12V,whichcanbescaledupto75Abyaddingmoreenvi……

UsingDigitalPotentiometersinAdjustableStep-DownDC-DCConverterDesigns……

背光驱动ＩＣ目录YOBONProductList2008/04/02Step-UpWLEDsDriverSwitchPartNoDescriptionVinOVPLEDNo.(Max.)DrivingTypebrighhtnessFrequencyFeedbackVoltagePkgTapereelStatusLimitPWMWhiteLEDsdriverwith……

Abstract:ThisarticledemonstrateshowtoachievecurrentlimitfortheMAX1692PWMstep-downregulatorbyusingaMAX4173Hcurrent-senseamplifier.Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSPOWER-SUPPLYCIRCUITSKeywords:currentlimit,currentsenseamplifier,buckregulator,pwm,step-downregulatorDec01,2000APPLICATIONNOTE478Current-LimitCircuitfortheBuckRegulatorAbstract:ThisarticledemonstrateshowtoachievecurrentlimitfortheMAX1692PWMstep-downregulatorbyusingaMAX4173Hcurrent-senseamplifier.AdditionalInformation:qQuickViewDataSheetfortheMAX1692qQuickViewDataSheetfortheMAX4173qSamplesandLiteratureOrderFormqTechnicalSupport:PowerAcurrentlimitcanbeaddedtoastep-downconverterbyusingaMAX4173Hcurrent-senseamplifiertoinjectcurrentintothefeedbacknetwork.D1sharpensthethresholdofcurrent……

摘要：这种接触器电路self-oscillates尽量减少电力消耗上。比较器开关作为必要的线圈之间的滞后限制当前向上和向下斜。电路开始self-oscillate当你增加的电压。Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSMISCELLANEOUSCIRCUITSKeywords:selfoscillating,contactdriver,holdpower,step-downconverter,solenoid,switches,relays,Dec03,2002standbyinverter,Allbright2180-40BcontactorAPPLICATIONNOTE1792Self-OscillatingContactorDriverMinimizesHoldPowerAbstract:Thiscontactorcircuitself-oscillatestominimizepowerconsumptionwhenon.Thecomparatorswitchesasnecessarytorampthecoilcurrentupanddownbetweenthehysteresislimits.Thecircuitstartstoself-oscillateasyouincreasethesupplyvoltage.Forswitchingcurrentsgreaterthanabout25A,solenoid-operatedswitchescalledcontactorsareusedinplaceofrelays.Acommonapplicationforcontactorsisindisconnectingthebatteryfroma……

MAX4173H电流检测放大器实现MAX1692PWM降压调节器的电流限制。Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSPOWER-SUPPLYCIRCUITSKeywords:currentlimit,currentsenseamplifier,buckregulator,pwm,step-downregulatorDec01,2000APPLICATIONNOTE478Current-LimitCircuitfortheBuckRegulatorAbstract:ThisarticledemonstrateshowtoachievecurrentlimitfortheMAX1692PWMstep-downregulatorbyusingaMAX4173Hcurrent-senseamplifier.AdditionalInformation:qQuickViewDataSheetfortheMAX1692qQuickViewDataSheetfortheMAX4173qSamplesandLiteratureOrderFormqTechnicalSupport:PowerAcurrentlimitcanbeaddedtoastep-downconverterbyusingaMAX4173Hcurrent-senseamplifiertoinjectcurrentintothefeedbacknetwork.D1sharpensthethresholdofcurrent……

摘要：USB供电设备需要受规管的供应。不幸的是，USB总线电压可以因4V9V。将MAX668升压控制器配置到步上/步落拓扑可以生成电流限制受规管的供应。Maxim>AppNotes>AUTOMOTIVEPOWER-SUPPLYCIRCUITSKeywords:USB,UniversalSerialBus,step-upstep-down,SEPIC,buck-boost,DC-DCcontroller,boostAug06,2002controller,DCtoDCAPPLICATIONNOTE1161CurrentLimitedDC-DCControllerUsedasStep-UpStep-DownSEPICPowerSupplyforUSBDevicesAbstract:USBpowereddevicesrequirearegulatedsupply.Unfortunately,theUSBbusvoltagecanvaryfrom4Vto9V.ConfiguringtheMAX668boostcontrollerintostep-up/step-downtopologycangenerateacurrent-limitedregulatedsupply.UniversalSerialBus(USB)isapopularwaytoconnectPCsandconsumerdevices.Itissimpleandinexpensiveandcanconnectmultipleexternalperipheralssimultaneously.Asmobiledevicesaddmorefunctionalitysuchastextmessaging,websurfin……

摘要：本应用程序说明演示如何形成负降压开关稳压器从升压开关控制器、使用MAX1771，高效率、升压的直流-直流控制器在脉冲频率调制（PFM）模式下运行。Maxim>Designsupport>Appnotes>Automotive>APP945Maxim>Designsupport>Appnotes>Power-SupplyCircuits>APP945Keywords:stepdownregulator,PWM,PFM,negativestep-downregulator,DC-DC,dc-dcJan31,2002APPLICATIONNOTE945Step-UpControllerFormsNegativeStep-DownRegulatorAbstract:Thisapplicationnotedemonstrateshowtoformanegativestep-downswitchingregulatorfromastep-upswitchingcontroller,usingtheMAX1771,ahigh-efficiency,step-upDC-DCcontrolleroperatinginpulse-frequencymodulation(PFM)mode.AsimilarversionofthisarticleappearedintheSeptember6,1999issueofEETimesmagazine.Positivestep-downswitc……