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Design of Current Limiting Circuit in Low Dropout.pdf

2024-10-28

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DesignofCurrentLimitingCircuitinLow DropoutLinearVoltageRegulator LINChuan,FENGQuan-yuan MicroelectronicsInstitute,SouthwestJiaotongUniversity,Chengdu,610031,China Email:lin_langai@163.com;TEL:028-86466365,028-86466028 Abstract-Acurrentlimitingcircuitappliedinlowdropoutlinear1.Whenovercurrenthasn’ttakenplace,thevoltage voltageregulatorisdesignedandsimulated.ItcanlimittheregulatorshouldregulatetheoutputvoltageUOnormally, maximumoutputcurrentandtheoutputshortcurrentoftheandthecurrentlimitingcircuitshouldhavelittleeffecton regulatorwithin320mAand30mA,respectively,andwellrealizeit. thepurposeofovercurrentprotection.Prototypeofthecircuit2.Acurrentlimitingcircuitshouldfirstincludeoutput canbefabricatedusingthe0.5µmCMOSprocess.currentdetectingdevicesorblocktodetectifoutput currentIhasexceededthemaximumratedvalue. IndexTerms-CurrentLimiting;Foldback;LDO;LinearVoltageO 3.Afterthecurrentlimitingcircuitstartsup,itshouldcut Regulator offthenegativefeedbackloopoftheregulator.Thenthe 1.INTRODUCTIONregulatorcannotregulatetheoutputvoltageanymore. Nowadays,LDO(LowDrop-out)linearvoltageregulator4.Afterfoldbackcurrentlimitingcircuitstartsup,IOwill hasbeenwidelyusedinportableequipments.InordertodecreaseasUOdecreases.Astheoutputisshorted,IOwill preventdamagetotheICwhenanoverloadisplacedorthebelimitedtoavaluemuchlessthanthemaximumrated outputoftheregulatorisshorted,currentlimitingcircuitsarevalue. usuallyincludedinLDOlinearvoltageregulator[1~3].Sofar,Besides,agoodcurrentlimitingcircuitshouldtakesome therearefewpaperspublishedaboutthedesignofcurrentotherfactorsintoconsideration,suchas:lowquiescent limitingcircuit,especiallyfoldbackcurrentlimitingcircuitsincurrentandpowerconsumption,fewdevices,lowcost,andso LDOlinearvoltageregulator.Itis,however,discussedinon. manypatents[4~5].AcurrentlimitingcircuitusedinLDO2.2DesignPrincipleofCurrentLimitingCircuit linearvoltageregulatorisdesignedandsimulatedinthisThecurrentlimitingcircuitpresentedinthepaperis paper.Thiscircuitcanbefabricatedusing0

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