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TPS63806: Could the device support input voltage =1.8V?

Part Number: TPS63806
Other Parts Discussed in Thread: TPS63802


Please see below design requirement, I checked DS and looks the device can't not support the requirement.

Input voltage in customer design may lower to 1.8V, in DS description, at least 1.8V input is needed for start up.

And also the 2.5A need to operate at input voltage greater than 2.5V.

Do you have any suggested device can fit below design?

Vin: 2.0V (1.8V min)

Vout: 4.2V

Iout: 2.5A

Ipk: 5A