Boost Converter Has High Efficiency at Light Loads

Abstract:ThisdesignnoteshowshowaboostconverterisdesignedfromaquadSchmitt-triggerNANDgateandtheMAX921,acomparatorwithintegratedvoltagereference.Consumingonlymicrowattsofpower,this5V-to-15Vboostconverterprovideslowloadcurrentswithhighefficiency.Theefficiencyis>90%forloadcurrentsbetween1mAand8mA.Maxim>AppNotes>AmplifierandComparatorCircuitsKeywords:DC-DCconverter,lowloadcurrents,boostconverter,Schmitt-triggerNANDgateJul09,1998APPLICATIONNOTE110BoostConverterHasHighEfficiencyatLightLoadsAbstract:ThisdesignnoteshowshowaboostconverterisdesignedfromaquadSchmitt-triggerNANDgateandtheMAX921,acomparatorwithintegratedvoltagereference.Consumingonlymicrowattsofpower,this5V-to-15Vboostconverterprovideslowloadcurrentswithhighefficiency.Theefficiencyis>90%forloadcurrentsbetween1mAand8mA.InmostDC-DCconverters,thenormalsupplycurrentsdonotallowhighefficiencyatlowloadcurrents.ThecircuitinFigure1,however,containsmicropowercomp