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TPS40422: Maximum wattage & power dissipation

Part Number: TPS40422
Other Parts Discussed in Thread: TPS549D22, TPS53667, TPS53647

Can we use this IC for the following requirement?

Vin = 12V

Vout = 0.85V

Output Current 40A (Max)

Programmable output voltage using I2C

Enable control

output margin control

How power dissipation is managed in this IC because in the datasheet thermal details are not much explained.

Please suggest some solution to meet the requirement