LT3763 Vin requirements

I'm working on programmable power module based on LT3763. The main power input is +48 Vdc and I have on board also +7.5 V dc.

My question: is it possible to power LT3764 Vin with mentioned bias of +7.5 V while power MOSFETs is powered by +48 Vdc? Idea is to reduce dissipation of internal regulator. Vout should be from 0 to +20 V (i.e. above bias voltage).

Many thanks in advance,