TPS22915: Input capacitor, Output Capacitor selection.

Tool/software:

Hello, TI Team.

I am using TPS22915B in my system.

In the datasheet , Cin /Cout ratio 10:1 is recommnded. 

I want to increase the output capacitance about 4.7uF.

I have 2 questions.

1. So in this case Should I use 47uF for input capacitor?

    Or 10uF can be enough? Maybe 22uF? The ratio then becomes 2:1 or 4:1.

2. The datasheet says that 1uF is the recommended value,

   but is it okay to use a large capacitor exceeding 10uF as the input capacitor?

Thanks.