Hi,
I'm designing a product using the μPD720210 USB Hub, and have 95% of it figured out, but I can't quite tell how the AVDD33R pin should be used if I want to use both the internal LDO and the Switching Regulator. I've gone through the datasheet, user manual and reference design schematic, and from the information provided it looks like this is how it's used (AC coupled to ground via a 10nF cap - see PDF attached). But it doesn't make a huge amount of sense as to why - can someone confirm if this is correct please?6038.LDO_SMPS_PINSTRAP.pdf