USB Power Delivery Connectors


Xmultiple's Engineering Department

USB has expanded from a data interface capable of supplying limited power to a primary provider of power with a data interface. Many devices charge or get their power from USB ports. The products with USB connectors for distributing power are in PCs, laptops, cars, aircraft or wall socket adapters just to name a few. USB has become a power socket for many small devices such as cell phones, MP3 players, flash drives, and other hand-held devices. Users rely on USB ports to fulfil their requirements not only in terms of data but also to provide power and to charge, their devices.

The USB Power Delivery Specification enables the maximum functionality of USB by providing more flexible power delivery along with data over a single cable.

USB Power Delivery connectors are the same as non-power delivery connectors except for 2 extra pins for detecting cables that can carry higher currents. The power is carried over VBUS.

USB Power Delivery offers the following features:

1. Power up to 100W over the existing USB standards.

2. Power direction is no longer fixed. This enables the product with the power (Host or Peripheral) to provide the power.

3. Optimize power management across multiple peripherals by allowing each device to take only the power it requires, and to get more power when required for a given application.

4. Intelligent and flexible system level management of power via optional hub communication with the PC.

5. Allows low power cases such as headsets to negotiate for only the power they require.

The USB Standards website provides the examples below.

1.Enables new higher power use cases such as USB bus powered Hard Disk Drives (HDDs) and printers. This eliminates the need for a separate power brick.
2.A monitor with a supply from the wall can power, or charge, a laptop while still displaying.
3.USB power bricks or chargers are able to supply power through a laptopíŽs USB ports.
4.Laptops and USB power bricks can provide higher power to battery powered devices (not currently defined by USB).
5.Battery powered devices can get increased charging current from a hub and then give it back temporarily when the useríŽs HDD requires to spin up.

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