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USB Power - 3.0 Gigabyte 3X Power

Xmultiple's Engineering Department


The specifications of the USB-IF states an USB 2.0 port can provide up to 500mA of power, whereas, a USB3.0 port can actually provide 900mA of power. Because of the power delivery capabilities of the USB standard, today, there are a multitude of chargers and 5v power adapter products available on the market that use USB as their connection and charging interface. USB devices such as a small fan, LED light, cell phone or PSP adapter are examples of USB products which plugged into laptops and PCs.

Some of these products requires more than 1A of power, however the USB 2.0 is only able to deliver a maximum of 500mA (.5A), which is not enough to power if it exceeds 500mA.

USB 3.0 is designed for devices which need high power. The preset value cannot exceed 5.0 A for most products designed to use the USB 3.0 Power connectors. Products using USB Power are designed to shut down the power if it exceeds the 5A limit. However some manufacturers in order to be on the safe side, may set the limit even lower.

Recently developed motherboards with 3x USB Power Supply

In general, a USB 2.0 hub port has a current limitation of 500mA, but some new products with GIGABYTE motherboards are equipped with 3x USB Power supply which is able to provide 1.5A for each USB 2.0 port. Additionally, USB 3.0 hub ports, moreover the USB3.0 hub port can even provide up to 2.7A of power for USB 3.0 devices. With this new Gigabit motherboard there is are two USB 3.0 ports which are able to provide a total of 5.4A of power.

Is faster USB 3.0 already planned?

A rather surprising announcement was made during CES 2013 that the official USB promoter group has a grand plan to double speed of USB 3.0 to 10Gbps from current 4.8Gbps. This is a clear response to the threat of Thunderbolt which is still slow at gaining traction. The new standard is called USB 3.1. The USB 3.1 will operate with existing connectors, yet new cables may not be needed which will be capable of operating at 10Gbps. There will even be improved data-encoding efficiency for applications like video and audio. Software stacks and class protocols will also work seamlessly.

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