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I think Maxim has several low voltage chips for step-up convertors and as I remembered they are used in the voltage u mentioned (for Sollar Cell step-up) but for such a high current, there must be a high voltage controll voltage to drive a mosfet, thus first use the chip from maxim to boost a control voltage (up to 5 or even 12 volt) then use another chip for boost regulator control.
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