TPS62090 - the stability(the phase margin) of the circuit

Hi all,

Would you mind if we ask TPS62090?

<Question1>
The control method of TPS62090  is "Bang-Bang" control which combines the advantages of hysteretic and voltage mode control.
As long as we use the value of the inductor and the output capacitance which is recommended on the datasheet,
we don't need to mind the phase margin, do we? 

<Question2>
Our customer uses following constants;
L=1uH, Cout=22uH, R1(Rfbt)=47KΩ, R2(Rfbb)=15KΩ
So, in order to achieve low quiescent current and acceptable noise sensitivity, they use over 5µA for the feedback current IFB.
The feedback Rfbt and  Rfbb are not relation the stability(the phase margin) of  the circuit, are they?

Kind regards,

Hirotaka Matsumoto