Even with a powered USB hub the device can still not get enough power, depending on the device.
What I had to do for my LG DVD LG DVD drives is use a split USB cable. One connection to the device and two USB connections to the hub. The two connections are one for power and one for data. This works great and can be reasonably purchased from 'MONOPRICE.COM'. I don't remember if the SP3 charger has a USB on it, if not you will need a hub. If it does then put on USB port on the SP3 and one on the charger port.