Written by Vinson, Co-founder at Chargeasap, with 10 years building and testing portable chargers.
Ten years ago, I was carrying four separate charging bricks in my bag. A 96W laptop charger, a 20W phone charger, a USB-A power bank, and a bulky universal travel adapter. Each one was heavy, ran hot, and took up half my carry-on. When I started Chargeasap, fixing that problem was the entire point.
GaN (Gallium Nitride) technology changed everything. In this guide, I will explain exactly what GaN is, why it matters, and how to choose the right GaN charger for your specific setup, based on what I have personally tested and what our customers tell us works.
What Is a GaN Charger and Why Does It Matter?
Traditional chargers use silicon to conduct electricity. Silicon works, but it generates a lot of heat. To stop the charger from overheating, manufacturers have to spread the internal components out, which is why old laptop bricks are so large and heavy.
Gallium Nitride is a next-generation semiconductor that conducts electricity far more efficiently than silicon. Because it generates significantly less heat, the components inside a GaN charger can be packed much closer together. The result is a charger that is up to 60% smaller and lighter than its silicon equivalent, while delivering the same or greater power output.
The Navitas Semiconductor GaNFast chips we use in our Zeus charger are a good example: they switch at frequencies up to 10 times higher than silicon, which is what allows us to fit 280 watts of output into a device the size of a deck of cards.
The Most Important Thing Nobody Tells You About GaN Chargers
When you see a GaN charger advertised as "100W," that number is the total combined output, not what each port delivers when multiple devices are connected.
This is the single most common source of disappointment I hear from customers who bought a cheap multi-port GaN charger. They plug in their laptop and their phone, and suddenly the laptop is only getting 45W instead of 100W. At that power level, a 16-inch MacBook Pro under load will actually drain its battery while plugged in.
The fix is to buy a charger with enough total wattage overhead that your primary device always gets its full allocation. For a MacBook Pro 16-inch, that means you need a charger with at least 200W of total output to guarantee 140W to the laptop while still powering other devices.
How to Choose the Right GaN Charger
The right charger depends entirely on what you are charging. Here is how I recommend thinking about it:
| Your Setup | What You Need | Recommended Charger |
|---|---|---|
| iPhone or Android only | 20-30W single port | Miko 30W |
| iPhone + AirPods, or iPad + phone | 65-100W, 2 ports | Omega 100W |
| MacBook Air + iPhone + iPad | 100-140W, 3 ports | Omega 200W |
| MacBook Pro 16" + multiple devices | 200W+, guaranteed 140W on port 1 | Zeus 280W |
| Two laptops or heavy travel setup | 280W, dual 140W ports | Zeus 280W |
What to Look For on the Spec Sheet
Before buying any GaN charger, check these three things:
1. Power Delivery version. Look for PD 3.1 support. This is the USB-IF standard that enables single-port outputs above 100W. Without PD 3.1, a charger physically cannot deliver 140W to a MacBook Pro.
2. The power distribution table. Reputable brands publish a chart showing exactly what each port outputs when 1, 2, 3, or 4 devices are connected. If a brand does not publish this table, that is a red flag. Our Zeus 280W power distribution table is published on the product page under Tech Specs. Port 1 stays at 140W regardless of what else is plugged in.
3. The chip manufacturer. The quality of the GaN chip determines how efficient and how safe the charger is. Look for Navitas GaNFast, GaN Systems, or Infineon chips. Avoid chargers that do not disclose their chip manufacturer.
What Our Customers Say
Wayne E., a verified buyer from Australia, described exactly the scenario I built Zeus to solve:
"It has performed as stated. Being able to charge my MacBook Pro, iPad Pro and iPhone from the one device and at full speed is awesome. The small form factor means it fits amongst other chargers on the same power board."
- Wayne E., verified buyer, Australia
And Alan M., who travels with his family:
"Two units cover all our family's devices across domestic and international trips - iPhones, iPad, Apple Watch, laptops, and power banks. Everything in one small pouch. Replaced 4 chargers in my bag."
- Alan M., verified buyer
The Chargeasap GaN Charger Range
We have been building GaN chargers since before most people knew what GaN was. Every charger in our range uses premium GaN chips, publishes a full power distribution table, and is backed by a 30-day money-back guarantee and a 1-year warranty.
- Miko 30W - The smallest 30W GaN charger we have ever made. Single USB-C port. For everyday phone and tablet charging.
- Omega 100W - Three ports (2 USB-C, 1 USB-A) in a compact travel-ready body. Ideal for MacBook Air users.
- Omega 200W - Four ports with built-in global travel adapters. The best all-in-one travel charger for most professionals.
- Zeus 280W - Our flagship. 280W total, dual 140W ports, OLED display, and global adapters. Built for MacBook Pro 16-inch users and anyone who refuses to compromise on charging speed.
If you are unsure which charger is right for you, the Omega 200W covers 80% of use cases. If you own a MacBook Pro 16-inch and charge multiple devices simultaneously, the Zeus 280W is the only charger that guarantees you will never see your laptop battery drain while plugged in.
Shop the full Chargeasap GaN Charger range here.
Vinson is Co-founder at Chargeasap, an Australian charging hardware company that has shipped 13 Kickstarter products to tens of thousands of backers since 2016. He has personally tested every charger in this guide.
FAQ
What is a GaN charger?
A GaN (Gallium Nitride) charger uses a next-generation semiconductor instead of traditional silicon. GaN generates less heat, which allows manufacturers to build chargers that are significantly smaller and lighter while delivering the same or greater power output.
Is a GaN charger better than a regular charger?
Yes, for most users. GaN chargers are smaller, run cooler, and are more energy-efficient than silicon chargers. At the same wattage, a GaN charger will typically be 40-60% smaller than its silicon equivalent.
What wattage GaN charger do I need for a MacBook Pro?
A MacBook Pro 14-inch needs at least 67W to charge at full speed. A MacBook Pro 16-inch needs 140W. If you want to charge your MacBook Pro alongside other devices without any throttling, you need a charger with a total output of at least 200W, such as the Omega 200W or Zeus 280W.
Can a GaN charger damage my devices?
No. GaN chargers use the same USB Power Delivery (PD) protocols as standard chargers. They negotiate the correct voltage and current with your device before delivering power. A quality GaN charger from a reputable brand is completely safe for all USB-C devices.
