GaN Chargers and USB-C Power Delivery, Explained

Two technologies, one better charger

Modern charging improvements come from two separate advances that work together. GaN is about the charger hardware, making it smaller, cooler, and more powerful. USB-C Power Delivery (PD) is about the protocol, letting a charger and device negotiate the right amount of power so one charger can fast-charge many different gadgets. Understand both and the confusing world of chargers, wattages, and cables suddenly makes sense.

What GaN actually is

GaN stands for gallium nitride, a semiconductor material replacing the silicon used in traditional chargers. GaN handles power more efficiently and runs cooler, which lets manufacturers build chargers that are much smaller and lighter while delivering the same or more power. That is why a modern GaN charger can be a fraction the size of an old laptop 'brick' yet power a laptop, or pack multiple high-power ports into something pocketable. Less wasted heat also means better efficiency. GaN is simply a better-performing charger internally.

What USB-C Power Delivery is

USB-C Power Delivery (USB PD) is the standard that lets a USB-C charger supply far more power than old USB, and, crucially, deliver the right amount for each device. When you plug in, the charger and device negotiate: a phone might pull 20-30W, a tablet more, a laptop 60-100W or beyond (the latest PD revisions reach up to 240W). This dynamic negotiation is why a single good PD charger can fast-charge your phone one minute and your laptop the next, no separate proprietary bricks.

Wattage: matching charger to device

Power is measured in watts (W). Devices have a maximum charging speed, and you get the fastest charge only when the charger can supply at least that much. Rough guide: phones fast-charge around 20-45W (some higher), tablets 30-45W, and laptops commonly 60-100W. A higher-watt charger will not harm a lower-power device, it just supplies what the device requests, so a 100W charger safely fast-charges a phone and a laptop alike. Buying a single higher-watt GaN PD charger is often smarter than several small ones.

The cable matters too

A frequent gotcha: the cable can bottleneck charging. Cheap or old USB-C cables may only carry limited power, so even a powerful charger and capable laptop can charge slowly through the wrong cable. For high-wattage charging (say 100W+), you need a cable rated for it, look for the wattage rating, and for the very highest speeds an 'e-marked' cable. When fast charging fails to kick in, the cable is often the culprit, not the charger. Match cable rating to your highest-power device.

How to buy the right one

Practical advice: get a single GaN USB-C PD charger sized for your most demanding device, a 65W unit comfortably handles most phones, tablets, and thin-and-light laptops; go 100W+ if you have a power-hungry laptop. Multi-port GaN chargers let you charge several devices from one wall plug, great for travel and desks. Pair it with a cable rated for your needed wattage. Done right, you replace a drawer of proprietary bricks with one small charger that fast-charges everything you own.

Related on Skillo

See also: USB-C vs Thunderbolt vs USB4 explained, What is an eSIM and should you switch?.

Sources

• USB Power Delivery and GaN - Wikipedia

Published date reflects the original event date (2026-02-25). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.