I would like to use the Si8751 as a high side FET switch like on figure 3.1 of the datasheet. Table 4.8 states that the max voltage on any pin WRT ground can only be VDD +0.5V. Does this mean that the source pin (Pin 5) is only allowed to go as high as VDD +0.5V with respect to the Gnd pin (Pin 4)? That is the way I read the datasheet but it doesn't really make sense if the input and output sides are supposed to be isolated.
Sorry for the late response. this one must have slipped through the cracks somehow.
However, this has been answered in this thread: