标签: cmos升级

Bipolarlowdropoutregulators(LDOs)havebecomecommonplaceinavarietyofportableapplications,suchascellphones,pagersandPDAs.Theirpopularitystemsfromsmallpackaging,highoutputcurrentcapabilityandprecisionoutputvoltagespecifications.However,thebipolarprocesstechnologyfromwhichthesedevicesarefabricatedbringsinherentdisadvantages,suchasexcessivesupplycurrent.ThisapplicationnoteoutlinestheadvantagesofsmallgeometryCMOSLDOsoverbipolarLDOsandprovidescomparativetestdataofkeyregulatorspecificationsforapopularpin-compatiblebipolarLDOoverMicrochip’sCMOSLDOs.MAN766Pin-CompatibleCMOSUpgradestoBipolarLDOsAuthor:DonAlfano,DannyAlred,SUPPLYCURRENT:AbidHussainandPaulPaglia,CMOSVS.BIPOLARMicrochipTechnologyInc.Figure1(A)andFigure1(B)comparetheblockdia-gramforacommonbipolarregulatorwiththatofanINTRODUCTIONequivalentregulatorfabricatedinCMOS.Thesupplycurrenttothebipolardeviceisco……