What Laptop Charger Should You Use: can you replace the original power adapter with a smaller 65W GaN charger?

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1. Which charger for laptop? Why are original chargers so big?

a) Silicon-based technology

Traditional laptop power adapters rely on silicon components, which require large transformers and cooling systems.

b) Lack of versatility

Most factory power adapters fit only a specific computer model and do not offer extra ports for charging other devices.

2. What are GaN chargers?

GaN (gallium nitride) is a semiconductor material that enables more efficient current conduction and lower heat generation. Key advantages:

• More power in a smaller enclosure
• Higher energy efficiency
• Ability to power multiple devices simultaneously

Fun fact: GaN transistors switch faster than silicon ones, which is why a 65 W GaN charger is often barely larger than a standard phone charger.

3. Can a GaN charger damage a laptop?

No. A laptop with a USB-C port supporting Power Delivery negotiates power and voltage with the charger, so a more powerful USB PD charger is completely safe, and the laptop will only draw as much power as it currently needs.

a) Protection systems

Certified GaN chargers (CE, FCC, UL) are equipped with protections against short circuits, overheating, and overloads.

4. Is 65W enough for my laptop?

A power output of 65 W is sufficient for most 13-14-inch laptops. More demanding machines, requiring from 90 to 140 W, need a charger with adequate power.

• Ultrabooks and office laptops: 65 W is fully sufficient for stable operation and battery charging.
• Gaming laptops and workstations: require 90-140 W power adapters or higher. A weaker charger will also work, but the laptop will charge more slowly, may slowly lose power under heavy load despite being plugged in, and the operating system may display a warning about an underpowered charger (for example, on Dell laptops).

Keep in mind that a laptop without USB-C charging support, equipped only with a round barrel power connector, will not work with a USB-C charger. Furthermore, for power exceeding 60 W, a 5 A USB-C cable with an e-Marker chip is required.

Fun fact: Before 2021, the USB-C standard allowed a maximum power transmission of 100 W (20 V and 5 A). The modern USB PD 3.1 specification increased this limit to as much as 240 W.

5. Universal charging of multiple devices

Advantages of GaN chargers:

• Powering a laptop, phone, tablet, and other accessories with a single charger
• Availability of USB-C and USB-A ports for simultaneous charging
• Compact size for easier luggage organization when traveling

6. Why choose a GaN charger?

• Space-saving: significantly smaller footprint compared to classic power adapters
• Safety: built-in protection mechanisms against voltage spikes
• Versatility: ability to power many types of devices with USB ports
• Portability: low weight makes it easy to carry daily in a bag or backpack

Recommended GaN laptop chargers

FAQ

1. Will a GaN charger charge my MacBook?

• Yes, provided that the MacBook supports the USB-C Power Delivery standard.

2. Can I use a GaN charger with a gaming laptop?

• Yes, as long as the laptop supports USB-C charging. If the charger has a lower wattage than the original one, the computer will charge more slowly, and under full load, the battery may slowly discharge.

3. Do GaN chargers overheat?

• No, gallium nitride generates less heat than traditional silicon components, which makes cooling easier.

4. Can I use a single GaN charger for a laptop and a phone?

• Yes, multi-port models automatically adjust the charging parameters to each connected device.

Sources

• USB-IF: USB Charger (USB Power Delivery) - manufacturer page (usb.org)
• Dell: Lower Wattage Power Adapter Message - industry article (dell.com)
• Navitas: The GaN Revolution in Fast Charging & Power Conversion - industry article (navitassemi.com)
• Plugable: What is an E-Marker and why do they matter for power delivery? - industry article (kb.plugable.com)