LT3652 & SEPIC

Hi - I have a design with the LT3652, it's a very good chip. I'd like to know if there is chance that it could be used in a SEPIC topology? I use it as a 3-LiIon charger (1A), but my Vcc can be from 10 to 20V. So currently, I have a LT1935 to do the buck part when needed, but it's taking too much space and that does not fit.

I don't think it can, but maybe somebody smarter has a suggesion