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TPS25750: Do I need to care about PP5V capacitor if I'm designing sink-only solution?

Part Number: TPS25750

According to datasheet, PP5V capacitor is required to be 120uF, but do I really need that big of a capacitor if I'm not using PP5V path (device is only sink)?
So in that case: should the capacitor be that big (120uF), or it can be smaller (eg. 22uF), or it can be fully ommited?