I'm designing a PCB that includes UPD720201. I'm trying to follow the schematics from ET-D720201-0014(ISG-NC1-200052).pdf but I don't understand what happens with the Power Supply. The design is using one Boost converter to converter from 3.3V to 5V and other Buck to convert from 12V to 5V. What is the target of this?
The 12V and 3.3V are from the PCI Express connectors. Both converters produce 5V which is fed to the AP7215-33YG linear regulator that produces the 3.3V_Dual connected to the VDD33 pins of the controller.
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But, why two different ways to obtain 5V? Is it not enough with one? And why is Dual_3.3V needed if there is a 3.3V suply?
Thank you for your reply.