System and method for interconnecting downstream USB ports using limited power during unconfigured state

A method for limiting power supplied to a universal serial bus (USB) device in an unconfigured state, comprising the operations of:

• providing a first voltage regulator supplying a first voltage, the first voltage regulator being in electrical communication with internal device logic of a USB device;
• providing a second voltage regulator supplying a second voltage, the second voltage being higher than the first voltage;
• and
• limiting a current to the internal device logic of a USB device from the second voltage regulator to a maximum current of 100 mA.

A universal serial bus (USB)-to-USB device having unconfigured state power limitation functionality, comprising:

• a first USB interface in electrical communication with a first USB port;
• a second USB interface in electrical communication with a second USB port;
• an unconfigured state power limiter circuit in electrical communication with both the first USB interface and the second USB interface, the unconfigured state power limiter circuit limiting current drawn from the second USB port to no more than 100 mA during an unconfigured state;
• and
• internal device logic capable of providing device functionality.