LTC3855 5V in and 5V out

Can LTC3855 realize 5V in 5V out?

We have one situation, which is 5V in, or 12V in. No matter which one, we hope that the output is 5V.

If 12V in, LTC3855 can buck the 12V into 5V, that is no problem.

Here is the queation, if 5V in, Can LTC3855 shut down the buck function, and output 5V ?

Expecting the answer.

Thankyou.

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