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TPS22976: Equivalent part with no Body diode

Part Number: TPS22976

Hello Guys,

Good day. 

We have a customer looking for a pin-to-pin compatible with the TPS22976NDPU but without diode connected between drain and source. Is this available?

His idea is creating a power source selector: Using a control signal he want to select between 1.8V and 3.3V(see the attached pic).

Based on the ON1/ON2 configuration he wants to get (VIO2_ext = +3V3_VIOs) or (VIO2_ext = +1V8_VIOs).
The problem is: when (VIO2_ext = +3V3_VIOs) --> VOUT2 > VIN2 so the voltage on the net +1V8_VIOs becames 2.8V.

He believe the problem is that the integrated body diode is on.

Thanks in advance!

Art