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LM63615-Q1: Input capacitance

Part Number: LM63615-Q1

Hi team,

I have a question about input capactiance for LM63615-Q1. 

Vout=5V, Iload max =400mA. Vin=car battery

It is recommended to place at least 4.7uF as Cin in the datasheet.

Is it possible to minimize it to 1uF if I have bulk input cap(electrolytic) in additon to 1uF MLCC?

I plan to use 300uF electrolytic cap on input.