GaN Chargers Explained: Smaller, Cooler and Faster

A few years ago, charging a laptop meant carrying a heavy brick. Now a charger the size of a matchbox can power a MacBook, a phone and earbuds at once. The reason is gallium nitride, or GaN.

What GaN is

GaN is a semiconductor material that handles higher voltages and switches faster than traditional silicon, with less energy lost as heat. That lets designers build smaller chargers that deliver more power without overheating.

USB Power Delivery

Most modern GaN chargers use USB C with USB Power Delivery (PD). The charger and device talk to each other and agree on the right voltage and current. That means one charger can safely charge a phone, a tablet or a laptop.

• PPS (Programmable Power Supply) is part of USB PD and is used by many Samsung phones for their fastest charging.
• Check that your phone’s fast charging standard is supported.

Understanding wattage

• 20 to 30 W: fast charging for most phones.
• 45 to 65 W: tablets and many thin laptops.
• 100 W and above: larger laptops or charging several devices at once.

On multi port chargers, the total wattage is shared. A 65 W charger might give 45 W to a laptop and 20 W to a phone when both are connected. Check the port split in the specifications.

Buying tips

• Buy from reputable brands with safety certifications.
• Use good USB C cables rated for the wattage you need. 100 W and above often needs an e marked cable.
• Be careful with very cheap “GaN” chargers in local markets; fakes are common.

Are they safe?

Yes, quality GaN chargers include protections against overheating, over voltage and short circuits. They also stay cooler than older chargers of the same power.

The bottom line

One good 65 W GaN charger can replace a bag full of bricks. It’s one of the most useful tech accessories you can buy.

Sources

• USB Implementers Forum, USB Power Delivery