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TPS43061: About high side MOSFET

Part Number: TPS43061

Hi team, 

My customer is trying to use TPS43061 and have 2 questions about the high side FET.

  1. In general boost converter, normal diodes are used for high side rectification. But for this device, MOSFET are use for synchronous rectification which enables high-efficiency for high-current applications. And in the datasheet, it says that  "In a boost topology, the input is passed to the output through the inductor and high-side FET body diode." Could you explain all the function of this high side MOSFET and why it helps to higher the efficiency?
  2. Can this high side MOSFET be substituted by a normal diodes?

Regards,

Ohashi