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TPS2115: Backdriving

Part Number: TPS2115

Hi Team,

We are using TPS2115ADRBR part in our design where we are connecting two different inputs as shown in the below image.

In the design we have pulled D1 to GND and used a DIP switch to D0. So whenever the D0 pin is LOW, irrespective of inputs OUT will be IN2.

where as if D0 pin is HIGH and IN2 is 0, i should get OUT as IN1 which is also working fine.

But, when i connect only IN1 and  leaving IN2 float we are observing voltage at IN2 pin. Could you please let us know why there is any backdrive in IN2 pin and what could be the possible solution.

Regards,

Anand M