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LMR36503: Minimum input capacitance

Part Number: LMR36503

Hi team,

Which is right minimum required input capacitance for 4.7uF and 2.2uF?
Datasheet says 4.7uF is minimum required value but block diagram shows 2.2uF is ok. Also initial webench parameter is 2.2uF.

Best regards
Koyo