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TPS65721 input capacitor question

Other Parts Discussed in Thread: TPS65720, TPS65721

I was looking at the application circuit for the TPS65720 and TPS65721 - on the BGA version, the 65720, there is an input capacitor of 2.2uF on VINLDO1.  

On the circuit for the 65721, there is no input capacitor.  Is there a reason?  Or is this a datasheet omission?

I'm using the 65721, and would just as soon leave it out, since there's already an output cap on the DC/DC converted output which feeds directly into VINLDO1.