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TPS63020: USE OF SPERCAPACITOR

Part Number: TPS63020

Hi Sir

can you tell me how to use battery , supercapacitor and USB at the same time  with this TPS63020 output needed is 3.9V@2A  and please do suggest the suitable supercapacitor specification  and switching circuit so that  one output voltage is available out of three inputs(USB, Battery and supercapacitor ) for the board at all time with constant current .