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Engadget
Why are there so many fast charging standards, and what's the difference between them?
The article provides insights into the different fast charging standards, asserting that USB Power Delivery (USB PD) has emerged as the most universally adopted standard in modern devices. It outlines advancements like USB PD 3.1, which supports up to 240W, making it suitable for high-power devices such as laptops. The discussion also touches upon the limitations of this standard for phones, which generally do not require such high power levels due to thermal constraints. The article further contrasts USB PD with Qualcomm's Quick Charge, historically significant yet overshadowed by USB PD's broader adoption.
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Published 23 Aug 2026, 19:25 UTC1 min read
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Summary
TL;DR
- USB Power Delivery (USB PD) is the predominant fast charging standard.
- USB PD 3.1 supports up to 240W for high-demand devices.
- Phones typically utilize charging systems around USB PD.
- Qualcomm Quick Charge remains relevant but is less common.
- Fast charging power is highest when batteries are low, tapering off afterward.
Interesting facts
- USB PD's Programmable Power Supply (PPS) functionality enhances charging efficiency.
- The iPhone 17 series supports USB PD for fast charging.
- Not all phones labeled as supporting Quick Charge actually use it.