Oliver,
we do have a few of those type of parts. Mostly they are associated with our isoPower product group.
As an example the ADuM3070 drives an external transformer and has the loop closed through the iCoupler
Also the ADuM5010 is fully integrated for lower power applications.
What voltages and current are you talking about?
Do you need isolation and regulation or just a open loop push pull driver?
LucaV