adi_adp2442_1a同步降压稳压器设计方案

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1、ADIADP24421A同步降压稳压器设计方案关键词：电源管理, DC/DC,降压稳压器ADI公司的ADP2442是一款高效、同步、恒定频率、电流控制模式降压型DC/DC稳压器，该芯片具有优秀的负载稳压特性，负载驱动能力可达到1A。ADP2442具有较宽的输入电压范围（4.5V-36V），可以应用于多种稳压输入源，输出电压范围为0.6V-0.9*Vin。ADP2442具有过流保护、过热保护、欠压锁定等多种内部保护功能。本文通过总结ADP2442器件的特点，介绍器件、特性、应用方向及内部结构框图，并给参考设计实例原理图、制板

2、图及元器件清单。TheADP2442isaconstantfrequency,currentmodecontrol,synchronous,step-down,dc-to-dcregulatorthatiscapableofdrivingloadsofupto1Awithexcellentlineandloadregulationcharacteristics.TheADP2442operateswithawideinputvoltagerangefrom4.5Vto36V,whichmakesitidealforregu

3、latingpowerfromawidevarietyofsources.Inaddition,theADP2442hasverylowminimumontime(50ns)andis,therefore,suitableforapplicationsrequiringaveryhighstep-downratio. Theoutputvoltagecanbeadjustedfrom0.6Vto0.9×VIN.HighefficiencyisobtainedwithintegratedlowresistanceN-chan

4、nelMOSFETsforbothhigh-sideandlow-sidedevices. Theswitchingfrequencyisadjustablefrom300kHzto1MHzwithanexternalresistor.TheADP2442alsohasanaccuratepower-good(PGOOD)open-drainoutputsignal. TheADP2442offerstheflexibilityofexternalclocksynchronization.Theswitchingfrequ

5、encycanbesynchronizedtoanexternalclock,appliedtotheSYNC/MODEpin.TheADP2442canalsobeconfiguredtooperateintheforcedfixedfrequencymodeforlowEMIorpowersavingmodetoreducetheswitchinglossesatlightload. TheADP2442useshiccupmodetoprotecttheICfromshortcircuitsorfromovercur

6、rentconditionsontheoutput.Theinternalsoftstartlimitsinrushcurrentduringstartupforawidevarietyofloadcapacitances.Otherkeyfeaturesincludeinputundervoltagelockout(UVLO),thermalshutdown(TSD),andprecisionenable(EN),whichcanalsobeusedasalogiclevelshutdowninput. TheADP24

7、42isavailableina3mm×3mm,12-leadLFCSPpackageandisratedforajunctiontemperaturerangefrom−40℃to+125℃. ADP2442主要特性：Wideinputvoltagerangefrom4.5Vto36V Lowminimumontimeof50nstypical Maximumloadcurrentof1A Highefficiencyofupto94% Adjustableoutputdownto0.6V ±1%outputvoltag

8、eaccuracy Adjustableswitchingfrequencyfrom300kHzto1MHz Externalsynchronizationfrom300kHzto1MHz Pulseskipmodeorforcedfixedfrequencymode Precisionenablein