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TPS51604 - Boost supply

I'd like to run this part at a DC as high as 100%, so I was planning to use an external boost charge pump. The input voltage would be as high as 28VDC, and the mosfet I'm planning to use requires 4V, so I'd set the boost supply at 32-35VDC (data sheet lists 35V max).

However, the data sheet Max Ratings for Boost-SW is 6V max.  This means that the boost supply would absolutely have to swing with the SW signal, with no more than a 6V boost. 

I presume this precludes using a DC boost supply.  Is this correct??