USB 3?

[tllim]

CYUSB3610-68LTXC
$5.82 for the chip and add the USB C connector + a PCB carrier about $8 designed to replace the Ethernet connector on the Pine64 and then the fun begins:
Rebuild the kernel dropping the Ethernet blob from Allwinner and adding your own.

We tried this on another Chinese ARM SBC and failed, without the 'blob' nothing worked, seems they don't know their own 'blob'.

There will be Gigabyte Ethernet HUB to USB 3.0 soon, buy one and enjoy the Pine for what it is.
 
FYI: Max Power for Bus Power 3E 496 mA for USB 3.0
that is the rated milliamp or .496 amps for the one part. Kind of shortens the batteries life a little.

I don't think you need this chip. As mentioned earlier, Pine A64 has RGMII port for GbE phy.