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Input Capacitor Atleast a20μFinput capacitoris recommended to improve transient behaviorofthe regulator andEMIbehavior ofthe total powersupplycircuit.Aceramiccapacitorplacedascloseaspossibleto the VINandPGNDpinsof the IC is recommended. OutputCapacitor Forthe outputcapacitor,useofasmallceramiccapacitorsplacedascloseaspossibleto the VOUTandPGND pinsofthe IC is recommended. If, for anyreason, the applicationrequires the useoflarge capacitorswhichcan not beplacedclose to the IC, useasmaller ceramiccapacitor in parallelto the large capacitor. Thesmall capacitor shouldbeplacedascloseaspossibleto the VOUTandPGNDpinsofthe IC. Therecommended typical outputcapacitorvalueis 66µFwithavarianceasoutlinedin Table2. Thereis alsonoupperlimit for the outputcapacitancevalue.Largercapacitorswillcauselower outputvoltage ripple aswellaslower outputvoltagedropduringload transients. Whenchoosing input and output capacitors, it needs to be kept in mind,that the value of capacitance experiencessignificantlosses from their rated valuedependingonthe operatingtemperature andthe operating DCvoltage.It's notuncommonfor asmallsurfacemountceramiccapacitorto lose 50%andmoreofit's rated capacitance. Forthis reason, it is important to usealarger value ofcapacitance or acapacitor withhigher voltageratingin orderto ensurethe required capacitanceatthe full operatingvoltage.
