how to implement two mode witch charge pump circuit

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ietc

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require charge pump work in both x1.5 mode and x2 mode.

how to implement these two mode with charge pump circuit.
that is, how to control circuit working in these two modes ?
I know x2 mode is the voltage doubler, but how to implement x1.5 mode?

Thanks in advance
 

using regulator to adjust the ouput voltage.
 

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