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LM5122-Q1: min output capacitor

Part Number: LM5122-Q1

Hi team,

My customer uses 8 capacitors in parallel as the output capacitor.  Spec of them are, 50V, 4.7uF, ESR=2.4mohm.

System requirement is, vout=23.18V,iout=1.079A, required ripple=1% Vout.

According to the formula in datasheet, if we calculate the Capacitor value by ripple and ESR, we will get several nF is necessary. 

I think there should be another system-level requirement(e.g. load transient) that set a min value of the capacitor. Could you help to provide some comments?

B&R

Lijia