GaN Charger Technology
Gallium nitride let chargers get smaller and cooler at the same wattage. This guide covers what actually changes between silicon and GaN, what happens at each wattage tier, and how to evaluate a GaN supplier.
Three routes, and you only need one of them
Understanding the technology, choosing a supplier, and picking the wattage tier are three different jobs. Start with the one you are actually doing.
Understand what GaN changes
The switching behaviour is the whole story. Everything else about a GaN charger follows from it.
Choose a supplier
A GaN supplier is judged on the platform and the feedback loop, not on saying the word GaN.
Pick the tier and the program
Wattage decides the use case, and the program decides what you can change inside it.
What the smaller enclosure actually costs you
GaN buys size and efficiency. It does not buy forgiveness, and the engineering that makes it work is the part worth paying for.
Smaller is a thermal problem, not a size problem
A GaN charger is smaller because it switches faster and wastes less energy as heat. Remove the volume and you also remove the thermal mass, so the thermal design becomes the deciding engineering task.
Where GaN is not automatically better
At low wattage the size difference is small and the cost difference is not. GaN earns its premium as wattage rises; in a 20W charger it is usually the wrong tool.
What changes as the wattage climbs
The tier decides the protocol set, the cable requirement and the thermal budget. Buying a tier above the device is as much a mistake as buying below it.
20W to 45W
Phone and small tablet territory. USB-C PD with PPS, single or dual port, and the smallest enclosures. This is where the volume is.
65W to 100W
Single-cable laptop charging. Now the cable becomes part of the specification, and a charger that hits its rating only with the supplied cable has a marketing problem.
140W to 240W
Multi-device and PD 3.1 EPR territory. The engineering moves to power sharing between ports and to managing heat when every port is loaded at once.
What actually decides whether a GaN charger performs
The thermal path, not the semiconductor
GaN reduces the losses. Where those remaining losses go is decided by the enclosure and the potting, not by the die.
The controller and the firmware
Protocol negotiation lives in firmware. A better controller is what makes the charger ramp correctly instead of dropping to a safe default.
The cable rating
A 100W charger with a 60W cable delivers 60W. The cable is part of the product whether or not it is in the box.
How the ports share load
Multi-port units are judged when every port is loaded. The allocation algorithm is the difference between a spec sheet and real behaviour.
Where to go from here
Four guides that pick up where this one stops.
Travel & wireless charging
Form factors and wireless platforms.
Open the guide →OEM & ODM programmes
Turning a platform into your product.
Open the guide →Factory & production
Capacity, platforms and schedules.
Open the guide →Quality & inspection
How GaN boards are actually tested.
Open the guide →GaN charger questions
Is a GaN charger better than a silicon charger?
At higher wattage, yes — smaller, cooler and more efficient for the same output. At 20W the difference is marginal and not worth a premium. GaN earns its cost as wattage and port count rise.
What is the difference between PD 3.0, 3.1 and PPS?
PD 3.0 covers up to 100W. PD 3.1 adds EPR, which extends the range to 240W. PPS is a separate mode that adjusts voltage smoothly rather than in fixed steps, and it is what fast-charging phones rely on.
Does a GaN charger need a special cable?
It needs a cable rated for the current and the power you expect. A 100W charger with a 60W cable will negotiate down to 60W, and the charger will look like it is underperforming when the cable is the limit.
Why does my multi-port charger slow down when I use two ports?
The total output is shared across the ports by design. The allocation algorithm decides how, and units differ in how gracefully they redistribute when a second device is connected.
How do I evaluate a GaN charger supplier?
Ask for the platform list with wattage ranges, the controller used, and what the thermal testing regime is. A supplier that can describe the thermal design is a different supplier from one that repeats the word GaN.
Tell us the device and the wattage tier
Send the devices you need to charge, the ports you want and your target price. We will come back with the platform, the protocol set and the cable requirement.