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TPS780: Apply voltage on the LDO output

Part Number: TPS780


I have a question an application of this part.  It is being used to switch 1.8 and 2.8 V to power some relatively low power components, < 30 mA.  The input is a battery with voltage from 3-4.2 V.  The switching is done with an NFET below a resistor in the feedback network.

There are two use cases where 2.8 V could be applied to Vout from an external source when we program firmware to a microcontroller.  The LDO normally powers this microcontroller.

1) Vin is floating, only electrical connection is IN pin on the LDO, would be (Vout - body diode drop), Vout is set to:
1a) 1.8 V with feedback resistors
1b) " 2.8 V

2) Vin is connected to the battery, Vout is set to:
1a) 1.8 V with feedback resistors
2b) " 2.8 V

Would applying 2.8 V from an external source to the output be out of spec for any of the above cases?