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Without such a DC-DC chip, if there is no loss, 20\/4=5 times, and the input current is greater than 2*5=10A, it is impossible....

Find a DC-DC booster circuit, input 4V-6V(battery powered), output 20V2A. With LM3481, Vin>6.6V, the output can be 20V2A. Thank you?

Without such a DC-DC chip, if there is no loss, 20\/4=5 times, and the input current is greater than 2*5=10A, it is impossible.