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[Need suggestion for high output current DCDC] LTC3839

To whom may it concern.

Hi i'm looking for the DCDC that meet these specification below.

Input voltage=12V, Output voltage=0.85V, Output current=33A, efficiency >0.9.

Q1-1. I found LTC3839 could be the option. I checked EVB - DC1632A but its output voltage is 1.5V.

 Which part should i change the output voltage from 1.5V to 0.85V?

Q1-2.

What would be the efficiency if i change the output voltage of EVB - DC1632A from 1.5V to 0.85?

Q2. Is there better DCDC in efficiency wise under the condition i mentioned above?

Thank you!