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I came through this pdf in which CSD75205W1015 is used to control load power. I realised in that the two P MOSFETS are connected serially. My understanding is that it is a waste of energy. But I want to know why it has been done that way. What is the reason? Please shed some light.
http://www.ti.com/lit/df/tidr489/tidr489.pdf
and below is an excerpt,