I have seen several high-side MOSFET drivers which are internally isolated. As I can understand, isolated gate driving is a fairly new technology, since they encapsulate all the complexity in a single chip.
One such driver is the ADuM3322x (thanks to comment below), which is an isolated 4A Dual-Channel Gate Driver, designed to drive N-channel MOSFETs:
In the datasheet it is stated that,
The ADuM3220/ADuM3221 digital isolators require no exter-nal interface circuitry for the logic interfaces.
If this driver is indeed intended to drive a high-side MOSFET, there needs to be an added bootstrap circuitry, which I couldn't find any mention of in the datasheet, unless it does not even require the bootstrap circuitry.
As explained here,
You must drive the MOSFET between its gate and source terminals. Since the source terminal voltage of a high side MOSFET will be floating, you need a separate voltage supply (VBS: VBoot Strap) for the gate drive circuit.
I cannot understand how this circuit provides the needed voltage to power the MOSFET.
My first question is: How can this particular driver actually drive the high-side MOSFET?
Followed by: If this requires additional bootstrap circuitry, are there isolated high-side drivers which come with in-built DC-DC converters?