About TPS61088 input voltage questions

Dear engineer:

We will use this chip max input voltage about 13.2V.so a bit worry this point.

We have the following questions please help solve:

1. After the test we do before, we find when the input is higher than 12V, the output will have a voltage drop in output side, why there is a voltage drop across the silicon? which will represent a power dissipation when the input is higher the output.
2. Can this chip used as pass-through or 100% duty?

Thanks, if you have any issue please let us know.

there is minimum on time limitation in this chip, it means that you have better to set output voltage larger than max input voltage.