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USB-C Power Delivery: fast charging explained

USB-C Power Delivery, often abbreviated to USB PD, is a charging technology that allows compatible devices and chargers to communicate with each other and select a suitable charging power. This makes it possible to charge smartphones, tablets, notebooks and other compatible devices with more power than a conventional USB connection may provide.

However, a USB-C connector alone does not automatically mean that Power Delivery or fast charging is supported. The charger, the connected device and the USB cable all need to support the required charging specification.

What is USB Power Delivery?

USB Power Delivery is a charging standard that allows compatible chargers and devices to negotiate how much power should be supplied. Instead of every connected device receiving the same fixed charging power, the charger and device communicate so that an appropriate voltage and current can be selected within their supported specifications.

This makes USB PD suitable for a wide range of devices with different power requirements. A smartphone usually needs considerably less charging power than a notebook, for example, but both can use USB Power Delivery if the charger, device and cable support the required profiles.

What is the difference between USB-C and Power Delivery?

USB-C describes the physical connector, while Power Delivery describes a charging technology. A USB-C port can therefore support Power Delivery, but it does not necessarily have to. USB-C connections can differ in charging power, data functionality and the standards they support.

When choosing an extension lead or charger, do not rely on the USB-C connector alone. Check whether Power Delivery is explicitly specified and whether the available charging power is suitable for the device you want to charge.

How does USB-C Power Delivery work?

When a compatible device is connected, the charger and device exchange information about the charging options they support. They then select a suitable charging profile within the limits of both devices. This allows a charger with a higher maximum output to also charge devices that require less power, provided the relevant charging standard is supported.

The actual charging performance is determined by the complete charging system. The maximum output printed on the charger does not mean that every connected device will automatically receive that amount of power.

Which devices can be charged with USB Power Delivery?

USB Power Delivery is used by many modern smartphones, tablets, notebooks and other portable electronic devices. Whether a particular device supports PD and how much charging power it can use depends on its technical specification.

A device with a USB-C connection does not automatically support USB Power Delivery. Before choosing a charger or extension lead, check the charging requirements in the device manufacturer's specifications.

Can I charge a smartphone with a high-power USB-C PD charger?

Yes, if the smartphone and charger support compatible USB Power Delivery profiles. A charger that can provide a higher maximum output does not simply force that full amount of power into the connected smartphone. Compatible devices and chargers negotiate an appropriate charging level.

The charging speed will therefore depend on what the smartphone itself supports. Using a more powerful charger cannot make a device charge faster than its own maximum supported charging rate.

Can I charge a laptop with USB-C Power Delivery?

Many modern notebooks and ultrabooks support charging through USB-C Power Delivery, but laptops generally require more power than smartphones or small mobile devices. The USB-C charger therefore needs to provide sufficient output for the notebook and the notebook must support charging through the selected USB-C connection.

If the charging power is too low, the notebook may charge slowly, only charge while switched off or continue to discharge during intensive use. Always compare the power requirement of the notebook with the USB-C PD output of the charger or extension lead.

Does the USB-C cable affect fast charging?

Yes. The cable is part of the charging system and needs to support the power required by the connected devices. A USB-C cable that is suitable for basic charging may not necessarily support the same charging power as another USB-C cable.

For reliable Power Delivery charging, use a suitable cable that meets the requirements of both the charger and the device. This becomes particularly important when charging devices such as notebooks that require higher power levels.

Why is my device not charging at the maximum Power Delivery speed?

Several factors can limit the charging power. The connected device may support a lower maximum charging rate than the charger, the cable may not support the required power or another charging protocol may be needed. Devices can also reduce charging power depending on factors such as battery level and temperature.

The maximum power stated for a charger should therefore be understood as its available output under suitable conditions, not as a charging speed that every connected device will always use.

What is the difference between a USB charger and a USB hub?

A USB charger is primarily designed to supply electrical power to connected devices. A USB hub, on the other hand, is primarily designed to provide additional USB data connections for a computer or notebook. Although a hub may also supply power, charging is not necessarily its main function.

This distinction is particularly relevant when choosing an extension lead with integrated USB connections. If your main goal is to charge smartphones, tablets or notebooks, check the charging specification rather than simply the number of USB ports. The differences are explained in USB hub or USB charger: what is the difference?.

Why are extension leads with USB-C Power Delivery useful?

An extension lead with integrated USB-C Power Delivery combines mains sockets and charging connections in one location. This can reduce the need for separate plug-in chargers and is particularly practical on desks, worktops and other places where both mains-powered and battery-powered devices are used regularly.

Depending on the model, brennenstuhl® extension leads can combine USB-C Power Delivery with additional USB connections, switches, surge protection or other features. The available charging power and connection configuration depend on the individual product.

What should I look for when choosing a USB-C PD extension lead?

  • Charging power: Check how much USB-C Power Delivery output the extension lead provides and compare it with your devices.
  • Device compatibility: Make sure the smartphone, tablet or notebook supports USB Power Delivery.
  • USB cable: Use a cable suitable for the required charging power.
  • Number of connections: Consider how many USB and mains-powered devices need to be connected.
  • Socket arrangement: Make sure larger plugs and power adapters have enough space.
  • Additional functions: Depending on the application, switches, surge protection or mounting options may also be useful.

Is USB-C Power Delivery the right charging solution for me?

USB-C Power Delivery is particularly useful when different compatible devices need to be charged from one charging standard. It can provide a convenient solution for smartphones and tablets as well as more power-demanding devices such as compatible notebooks, provided the charger and cable meet the requirements of the connected device.

The important factor is not simply choosing the charger with the highest wattage. A suitable USB-C PD solution should match the devices you actually use, provide the required connections and deliver the charging power those devices can support.