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USB-C PD vs Quick Charge (QC): Key Differences

What is the difference between USB-C PD and QC?

Answer

USB-C Power Delivery (USB-C PD) and Qualcomm Quick Charge (QC) are both fast-charging “languages,” but they’re built on different standards and are commonly used in different ways.

USB-C PD is the USB-IF standard designed to work over the USB-C connector and is widely supported across phones, tablets, laptops, power banks, and wall chargers. It negotiates voltage and current between the charger and device to deliver the right power safely. Depending on the PD version and hardware, PD can scale from basic phone charging up to high-wattage laptop charging (for example, 60W or 100W with the right charger and cable). Many modern devices also support PD PPS (Programmable Power Supply), which can fine-tune voltage in small steps for efficient, cooler charging.

Quick Charge (QC) is a Qualcomm technology historically associated with many Android phones and USB-A chargers. QC also negotiates higher voltages (commonly 9V/12V and beyond, depending on the version) to charge faster than standard 5V. Newer versions such as QC 4/4+ are more aligned with USB-C and may incorporate USB PD concepts, but QC support still depends on the phone’s chipset and the charger’s QC capabilities.

The practical difference: if you’re charging a mix of devices (especially anything with USB-C, including laptops and newer tablets), USB-C PD is usually the most universally useful choice. QC can be very fast for compatible phones, but it’s less consistent across brands and device types.

For a deeper look at how PD 3.0 and QC 4.0 relate to cable ratings (like 100W USB-C to USB-C), see the main guide here: https://splendena.com/guide-100w-usb-c-to-usb-c-cable-pd-3-0-qc-4-0-guide/.

FAQ

Does a USB-C to USB-C cable need to be rated for 100W to use Power Delivery?

No. USB-C PD can work at lower power levels with many standard USB-C cables, but higher-watt charging (like 60W–100W) requires a cable rated for that current (often marked 5A/100W) and a compatible charger and device.