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GaN fast-charging technology
Technology

The GaN technology inside every Rongjun charger.

Rongjun is a GaN charger manufacturer, and our chargers use proven GaN chipsets from Yuantuo, Southchip and Diansi, on circuit boards and transformers our own engineers design in Dongguan, China. They support USB PD, PPS and Quick Charge, and every unit is hi-pot and aging tested before packing.

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Rongjun ultra-thin GaN charger
Up to 50% slimmer vs. traditional silicon chargers
GaN III

Proven chips, our own design.

We build on proven GaN chips and design the PCBA ourselves. A proprietary one-piece transformer lets us re-engineer the board into an ultra-thin flat “biscuit” shape — delivering full-power charging in the slimmest form factor, with less heat and higher efficiency than traditional silicon chargers.

Proven GaN chipsetsYuantuo, Southchip & Diansi — listed per model
One-piece transformerEnables the ultra-thin biscuit PCBA
Superior thermal controlRuns cooler at full load
Higher efficiencyStable output, no power reduction
Charging protocols

Speaks every fast-charging language

USB-C PD 3.1

The latest USB Power Delivery standard — up to 140W over a single USB-C port on our ZC504 140W; our other models use USB PD up to 100W.

PPS

Programmable Power Supply fine-tunes voltage and current in real time (20mV steps) for faster, cooler, more efficient charging.

Quick Charge

Broad compatibility with Qualcomm Quick Charge devices, alongside Apple and Samsung fast-charge profiles.

Multi-protocol & multi-port

Intelligent power distribution across USB-C and USB-A ports, auto-detecting each device for its optimal charge.

Want the full technical specs? Get detailed input/output, chipset and certification data for any model.
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Safety & testing

Built safe, tested 100%

Multi-protection circuit

Over-voltage, over-current, over-temperature, short-circuit and surge protection built into every board.

Aging test

Every unit runs under sustained load to verify long-term stability before it leaves the line.

Hi-pot test

High-potential dielectric testing confirms electrical insulation and user safety on 100% of production.

Thermal management

GaN efficiency plus optimized layout keeps surface temperatures low, even at full multi-port output.

FAQ

GaN Charger Technology Questions

Which chips do Rongjun chargers use?
We build on proven third-party GaN and controller chips from Yuantuo, Southchip and Diansi, listed per model on the spec sheet. Our own engineers design the circuit, the PCBA and the transformer around them.
Which fast-charging protocols do your chargers support?
Our chargers support USB Power Delivery, PPS and Qualcomm Quick Charge. The ZC504 uses USB PD 3.1 to deliver 140W from one USB-C port; our other models use USB PD up to 100W. The exact protocol list for each model is on its spec sheet.
Why use GaN instead of silicon?
GaN transistors switch faster with lower losses, so the transformer and other parts can be smaller and the charger runs cooler. That fits more power, or more ports, into a smaller charger. At the same wattage, GaN doesn't charge faster: speed depends on the power and the protocols.
Which protections are built into every charger?
Over-voltage, over-current, over-temperature, short-circuit and surge protection are built into every board.
How is every charger tested?
Every unit gets a 100% hi-pot insulation test and a 100% aging test under load before packing. A unit that fails is repaired and fully retested. Each lot is then sampled to ISO 2859-1 at AQL Critical 0, Major 0.65, Minor 1.5.