that IC has nothing to do with how much power a usb host will give you, it is merely a power switch for a usb port, most likely designed to be installed on the host side.
everyone has pretty much spelled it out to you - the HOST controls how much current you can have, no manner of circuitry external alone will yield the device more current from a single connection. The device can ask for more power, and must accept whatever the host is willing to give it, that is; the device must fail gracefully if the host will not provide the current the required.