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[Moved] charge pump from 2-2.5 Vin to 3.3 Vout

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doec

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Hi all,
I need help to design a charge pump from 2-2.5 Vin to 3.3 Vout, with a 20mA current load, f=1MHz using a CMOS 0.35u process.
I do not have particular spec on efficiency.
It is possible to use only internal components or I require external capacitor?
Do you have a simple but working output voltage control scheme easy to implement?
Thank you,
doec
 

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