Not sure how to explain this...

But I would love to find a switchmode regulator IC with some sort of=20
overvoltage protection built in.

As I've posted on here a couple of times recently, I'm dealing with=20
various input protection circuits which generally clamp to the rails -=20
sometimes raising the power supply rail to a too-high level due to the=20
power being clamped to the rail being in excess of what is being used on=20
that rail.

Right now, the best scenario I see is either a shunt regulator to sinks=20
the excess voltage to ground... a close second is a single channel of an=20
opamp which in effect does the same thing.

In an ideal world, my switchmode regulator (3.3V at around 1/2A or so)=20
would also 'clamp' excess voltage found on it's output pin, in a nice=20
and well-behaved way - so I don't have to add even more components to=20
the board.

Does such a beast exist?  I've looked but pretty much all the regulators=20
I find can't/don't/won't do that.  And yes, I understand why this isn't=20
a typical function - but before I give up I figured I'd ask on here also.

So any ideas?

-forrest

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