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USB- Power Delivery FAQ
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Q. What is USB Power Delivery(PD)?

Power Delivery (PD) is a specification for handling higher power and allows a range of devices to charge quickly over a USB connection. It operates by facilitating a conversation between two devices to negotiate a power contract so they can determine how much power can be pulled from the charger. Power Delivery starts at the 5V setting and is configurable up to 20V. Using a standard USB-C cable, it can handle up to 60W, and will go up to 100W using a designated EMCA cable.

Another point of interest regarding Power Delivery is that it allows for power to flow both ways, with no set direction based on circuit or connection. For example, if you were to connect two phones that support Power Delivery with a USB-C charging cable, one phone could charge the other and vice versa.

Mode of Operation

Nominal Voltage

Maximum Current

USB 2.0

5V

500mA

USB C

5V

3A

USB Power Delivery(PD)

Configurable up to 20 V

Configurable up to 5 A



Q. What are the benefits of USB Power Delivery(PD)?

Increased power levels from existing USB standards up to 100W.

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

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.

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

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

Fast speed

PD-ENABLED DEVICE

CHARGER POWER

CHARGING TIME

(to 50%)*

iPhone X

18W or higher

30 minutes

iPhone 8/8 Plus

18W or higher

30 minutes

iPad Pro

27W or higher

60 minutes

Google Pixel 2

18W or higher

30 minutes

Google Pixel 2 XL

18W or higher

30 minutes



Power






Q. How do I Know What Kind of PD charger I Need?
Batteries and wall chargers which employ USB PD have the ability to charge devices up to 100W output using a USB-C connector -- however, most output at 45W is on the upper range of what most smartphones and tablets can handle, but if you are looking to charge a Gogle Pixel, which will only accept 18-watts of power, your 45-watts charger will only deliver 18-watts.
Unless you have ather USB-PD-enabled devices which could benefit from a charger with higher wattage such as laptops or computers - a less expensive, lower wattage charger might be a better choice.



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