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TITPS63020高效小型升降压电源解决方案关键词：电源管理,DC/DC转换器TI公司的TPS6302x是高效小型升降压电源解决方案,输入电压从1.8V到5.5V,输出电流可高达3A,固定和可调输出电压从1.2V到5.5V,效率高达96%,能在降压和升压模式自动转换,静态电流小于50uA,固定工作频率2.4MHz,可用于所有两节和三节碱性电池,NiCd或NiMH或单节锂电池供电的设备,超小型移动PC和MID,数码媒体播放器,DSC和摄像机.本文介绍了TPS6302x主要特性,方框图,可调输出电压典型应用电路图以及TPS63020EVM评估板特性,电路图和材料清单(BOM).TheTPS6302xdevicesprovideapowersupplysolutionforproductspoweredbyeitheratwo-cellorthree-cellalkaline,NiCdorNiMHbattery,oraone-cellLi-IonorLi-polymerbattery.Outputcurrentscangoashighas3Awhileusingasingle-cellLi-IonorLi-PolymerBattery,anddischargeitdownto2.5Vorlower.Thebuck-boostconverterisbasedonafixedfrequency,pulse-width-modulation(PWM)controllerusingsynchronousrectificationtoobtainmaximumefficiency.Atlowloadcurrents,theconverterentersPowerSavemodetomaintainhighefficiencyoverawideloadcurrentrange.ThePowerSavemodecanbedisabled,forcingtheconvertertooperateatafixedswitchingfrequency.Themaximumaveragecurrentintheswitchesislimitedtoatypicalvalueof4A.Theoutputvoltageisprogrammableusinganexternalresistordivider,orisfixedinternallyonthechip.Theconvertercanbedisabledtominimizebatterydrain.Duringshutdown,theloadisdisconnectedfromthebattery.Thedeviceispackagedina14-pinQFNPowerPAD™packagemeasuring3×4mm(DSJ).TPS63020主要特性:Upto96%Efficiency3AOutputCurrentat3.3VinStepDownMode(VIN=3.6Vto5.5V)Morethan2AOutputCurrentat3.3VinBoostMode(VIN2.5V)AutomaticTransitionBetweenStepDownandBoostModeDynamicInputCurrentLimitDeviceQuiescentCurrentlessthan50µAInputVoltageRange:1.8Vto5.5VFixedandAdjustableOutputVoltageOptionsfrom1.2Vto5.5VPowerSaveModeforImprovedEfficiencyatLowOutputPowerForcedFixedFrequencyOperationat2.4MHzandSynchronizationPossibleSmartPowerGoodOutputLoadDisconnectDuringShutdownOvertemperatureProtectionOvervoltageProtectionAvailableina3×4-mm,QFN-14PackageTPS63020应用:AllTwo-CellandThree-CellAlkaline,NiCdorNiMHorSingle-CellLiBatteryPoweredProductsUltraMobilePC’sandMobileInternetDevicesDigitalMediaPlayersDSC’sandCamcorders图1.TPS63020功能方框图图2.TPS63021功能方框图图3.TPS6302x可调输出电压典型应用电路图TPS63020EVM评估板TheTPS63020EVMevaluationmodule(EVM)isdesignedtohelptheusereasilyevaluateandtesttheoperationandfunctionalityoftheTPS63020.Thisuser’sguideincludessetupinstructionsforthehardware,aschematicdiagram,abillofmaterials,andprinted-circuitboardlayoutdrawingsfortheevaluationmodule.AO-Electronics傲壹电子官网：中文网：评估板主要性能表:图4.TPS63020EVM-487评估板电路图TPS63020EVM-487材料清单(BOM):