TPS54302: Duty 100%

Part Number:TPS54302

Hi all

Would you mind if we ask TPS54302?

There is the description on the datasheet P11;
"To improve drop out, the TPS54302 is designed to operate at 100% duty cycle as long as the BOOT to SW pin voltage is greater than 2.1 V typically."

Is it possible to use TPS54302 with 100 duty at any case?
We assume that it requires boot charge times, so actually is the duty upto 95%?

Kind regards,

Hirotaka Matsumoto