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TPS61291: Reverse Power

Part Number: TPS61291

Hi,

We use a TPS61291 in our design for operating the device from a single LiMnO2 Primary Battery. Now i should design a extension-module that contains the possibility to power the device from a external supply.

If a battery is present, the external supply does not turn on, and the device operates in normal state.
If no battery is present, the TPS61291 would be unpowered and a external voltage of 3.3V would be applied to the output rail.

Since i do not found anything about reverse current/supply in the datasheet, i would like to ask if its possible to operate the device in this mode.