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TPS62177 Max allowed Vout when Vin is floating

Anders Knutson
Prodigy 30 points
Other Parts Discussed in Thread: TPS62177

Hi,

I plan to use the TPS62177 (Vout = fixed 3.3V) in a configuration where Vin is 9-26V.

I would also like to be able to supply this board with 3.3V directly when the 9-26V input is floating (not connected).
That means that Vout (SW, VOS, SLEEP pin) will be 3.3V in my configuration when Vin is floating.

Am I allowed to do so?
If not, are there any suggestion for how to change the circuit to make it possible to supply the board with 3.3V when the 9-26 input is not connected?