# USB 2.0 current supply [closed]

USB2.0 supports 0.5A for a downstream port. This means that the controller or hub can support a 0.5Amp USB load.I am not referring to the speed now. Suppose I have a load that runs on USB 2.0 speed but requires higher current, say 0.8Amps.

Can I not use a regulator on my hub( this will be a custom hub) that will provide the necessary power ? Is there any impact on the wire gauge in case of USB 2.0 ? USB cables usually carry 28AWG wires. They are sufficient for almost 1.4Amps. So would that not be sufficient ?

In that case why is there a cap/standard of 0.5Amps on the power for any USB slot ? Should it not technically just limit itself to speed and not power ?

## closed as too broad by Chris Stratton, Voltage Spike, Edgar Brown, Dmitry Grigoryev, Chetan BhargavaFeb 27 at 7:16

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

• your post is kind of fragmented .... you ask several questions, some of which are not related to each other, but you do not ask the question that you actually want to ask how do i power an 800mA device from a USB 2.0 port? ...... the answer: use two USB ports for power ....... amazon.com/HIGHROCK-Enhancer-Female-Charge-Extension/dp/… – jsotola Feb 24 at 6:06
• Most hubs use external power in the form of 5v, check the USB standard for what is appropriate – Voltage Spike Feb 25 at 1:23