TPS7A8300: TPS7A8300

Part Number:TPS7A8300

Hi 

While going the datasheet of TPS7A8300, I am not able to understand the figure 55 and 56.

And also not able to understand figure 3.What does mean by Vout(nom)% ?

Can anyone elaborate here?

We are using this IC to convert 1.8V to 1.6V but on page 6 we are saying VIN ≥ VOUT(TARGET) + 0.3 V. and on the same page Droop out voltage is mention as 200mV.

I am not able to understand what will be the difference should be Vin and Vout voltage.

Thanks

Ashutosh