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How to get a inner voltage regulator from high power?

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xiexi

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Now I use high voltage process, Vds can reaches 30V, Vgs can't exceed 5V, then my previous method using high voltage bandgap, OP, and power mos to generates inner votlage 5V is impossible, can anyone give me some instruction or suggestion of generating inner voltage 5V, thanks!
 

You can still use old structure. However, you need to add voltage clamp for those gates will be breakdown.
 

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