I'm a SW head trying to design a circuit that can switch 5V to a USB Port for embedded Host Operation and switch it off for USB Device operation. Microchip have a few schematics which show the use of their MCP1253 Charge pump for this.
Obviously they know what they're doing but looking at the specs for this device it can supply 150mA of Output current. That seems very light weight for USB Host? In addition it provides a regulated output power but since my input Voltage would be 5V power rail of the board I'm not sure I need a regulator. Obviously I'm missing something.
I'd be very grateful if somebody could explain why this is used to power USB Host at such low current.