question about charge pump voltage doubler bulk voltage

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allan_guo

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Just as described in the pic:
My question is how to determine the bulk(S3,S4) voltage?
I want to get a regulated voltage vout:vin<vout<2*vin,so there maybe 3 different
voltage levels:vin,vout,v(A);to prevent leakage current,the bulk (S3,S4) must be connected to the highest voltage, I have done voltage selector of vin&vout, But
the duration of v(A) is quite shot,so can I do voltage select for the three voltage levels.
anybody can give some advice or so paper about this question?thanks a lot !
 

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