LDO basic knowledge.pdf

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

2、ge,quiescentcurrent,standbycurrent,efficiency,transientresponse,line/loadregulation,powersupplyrejection,outputnoisevoltage,accuracy,andpowerdissipation.Eachsectionincludesanexampletoincreasetheunderstandability.Contents1DropoutVoltage......................................

3、...............................22QuiescentCurrent...................................................................33StandbyCurrent.....................................................................34Efficiency............................................................

4、...............45TransientResponse..................................................................56LineRegulation......................................................................57LoadRegulation.....................................................................68

5、PowerSupplyRejection..............................................................79OutputNoiseVoltage................................................................810InstabilityofLDORegulator..........................................................911Accuracy..........

6、.................................................................1012PowerDissipationandJunctionTemperature.........................................1113Summary...........................................................................12ListofFigures1TypicalApplicationCircu

7、itofLDORegulator................................................22DropoutRegionofTPS76733(3.3VLDO).................................................23QuiescentCurrentofLDORegulator......................................................34StandbyCurrentofLDORegulator..........

8、..............................................45TransientResponseof1.2-V,100mALDORegulato