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TPS61221: ORing circuit (LTC4412) with two inputs 3.3V (battery) and 5V (from USB input) followed by TPS61221.

Part Number: TPS61221
Other Parts Discussed in Thread: TPS63031, TPS61220


am using diode ORing circuit before TPS61221. 

so TPS61221 has input either 3.3V (battery) or 5V(USB).

is it ok to operate TPS61221 with USB voltage? do you see any potential risk in the circuit below? 

any recommendations? or reference design when operated with USB voltage? o/p needed is constant 3.3V