The downstream port power, VBUS, must be supplied by a source capable of supplying 5 V and up to 500 mA per port. Downstream port power switches can be controlled by the TUSB2046x signals. It is also possible to leave the downstream port power always enabled.
A large bulk low-ESR capacitor of 22 μF or larger is required on each downstream port’s VBUS to limit in-rush current.
The ferrite beads on the VBUS pins of the downstream USB port connections are recommended for both ESD and EMI reasons. A 0.1-μF capacitor on the USB connector side of the ferrite provides a low impedance path to ground for fast rise time ESD current that might have coupled onto the VBUS trace from the cable.