I used a +5V switching regulator in a project, which was a small hybrid
board with a TO220 footprint. It was a drop-in replacement for a 7805 with
similar Vin-max. I cannot recall the part number and I have moved the
equipment on.
However, I came accross this and it may foot the bill
http://www.narwani.net/neil/electronics/78SWxx/index.html
Lee
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