Hello. I have posted this question elsewhere and have not received a clear explanation of what is happening in this circuit. I have a notebook circuit which includes an IRF7811A Hexfet Mosfet and two SI4362DY mosfets. The IRF 7811 is used supposedly as the controller mosfet and the SI4362's are in parallel used as the synchronous rectifiers. At the drain of the controller mosfet there is supply voltage of 19.8 volts and 5.1 volts at both gates of the SI4362 mosfets in standby mode. When power is switched on, the controller mosfet turns on with 1.5 volts at the source and 1.8 volts at the gate. In addition, the SI4362 mosfets output 1.5 volts at the drain and the gate voltage changes to 4.5 volts. The only device that I can see that is driving the gates of these mosfets is a Maxim 1632 power IC. I know that this is a synchronous buck converter but I need to get the concept as to what each component is doing in each stage and how voltage is flowing and rectified.