Understanding the Terms and Definitions of LDO Voltage Regulators.pdf

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1、ApplicationReportSLVA079-October1999UnderstandingtheTermsandDefinitionsofLDOVoltageRegulatorsBangS.LeeMixedSignalProductsABSTRACTThisreportprovidesanunderstandingofthetermsanddefinitionsoflowdropout(LDO)voltageregulators,anddescribesfundamentalconcep

2、tsincludingdropoutvoltage,quiescentcurrent,standbycurrent,efficiency,transientresponse,line/loadregulation,powersupplyrejection,outputnoisevoltage,accuracy,andpowerdissipation.Eachsectionincludesanexampletoincreasetheunderstandability.Contents1Dropou

3、tVoltage.....................................................................22QuiescentCurrent...................................................................33StandbyCurrent.....................................................................34E

4、fficiency...........................................................................45TransientResponse..................................................................56LineRegulation.................................................................

5、.....57LoadRegulation.....................................................................68PowerSupplyRejection..............................................................79OutputNoiseVoltage........................................................

6、........810InstabilityofLDORegulator..........................................................911Accuracy...........................................................................1012PowerDissipationandJunctionTemperature............................

7、.............1113Summary...........................................................................12ListofFigures1TypicalApplicationCircuitofLDORegulator................................................22DropoutRegionofTPS76733(3.3VLDO)..............

8、...................................23QuiescentCurrentofLDORegulator......................................................34StandbyCurrentofLDORegulator........................................................45TransientResponseof1.2-V,100mALDORegulato