Dan Clement
Community Member
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Posts: 95
Salt Lake City, Utah, USA
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Why not push the power transistor off chip? Power Qs are cheap and at the size you are talking about it may begin to make sense.
If you can't do that you are stuck doing a custom layout. There are numerous issues including latch up, ESD, thermal, metal migration, yield, modeling, parasitic thyristors, etc.
If you don't understand all of these issues and mitigate the risks you will get burned.
I have seen some guys use multiple voltage regulators in parallel to make the stability a little easier. I also saw one person put a switch mode supply in parallel with an LDO.
I have also seen a few papers about using the gate RC as part of the stability.
For all things linear regulator check out Rincon-Mora's work.
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