What Exactly is Power Delivery in USB C Hubs?

The USB C Hub is an essential tool for those who need to connect multiple devices and share data on the go. However, understanding the concept of Power Delivery (PD) can be crucial, especially when it comes to charging your devices efficiently. This article aims to clarify the role of PD in USB C hubs and how it impacts the charging of your MacBook Pro 15 (2019) with an i9 processor and 16GB RAM.

Understanding Power Delivery

Power Delivery is a technology that allows devices and hubs to negotiate the amount of power that can be delivered from the adapter to the device. It's essential for high-power devices like notebooks to ensure they receive adequate power. In the context of USB C hubs, PD capabilities can vary widely depending on the hub's specifications.

Impact on MacBook Pro Charging

If you have connected a cable from a Power Delivery port/slot on your USB C hub to an 87W MacBook Pro adapter on the wall, it does not necessarily mean that your MacBook Pro will be charged quickly or at all. The effectiveness of the PD port and its ability to charge your MacBook Pro depends on the hub’s specifications and the power it can deliver.

Example of a Multi-Function Hub

Consider a hub with integrated wireless charging and USB ports. If you plug this into a power outlet only, it will work as a typical hub, providing power to low-draw devices. However, if you try to charge your MacBook Pro through the hub, which is drawing power from the non-dedicated PD port, the hub may disable the charging for higher-power consumption. This is because the hub is only designed to deliver a certain amount of power, typically 60W or less, which is insufficient for your MacBook Pro’s peak performance needs.

Case Study: Apple Charger and USB Hub Combination

When you use an Apple charger with a USB hub and a Mac, the hub can handle charging your MacBook Pro and even the hub itself, albeit at a slower rate. However, if you are placing a massive load on your MacBook Pro, it might start draining the battery despite being plugged into a power source. This is due to the hub's limited PD capacity compared to your MacBook Pro's peak power requirements.

Factors Influencing Power Delivery in USB C Hubs

There are several factors that influence the power delivery in USB C hubs:

Hub Specifications: Each hub has its own power delivery specifications, which can range from 60W to much higher levels. Always check the specifications to understand what the hub can and cannot do. Power Adapter: The power adapter you use also plays a significant role. An 87W adapter can deliver more power than a 60W hub can handle. Device Load: Higher load devices, like powerful processors and high-speed RAM, require more power. If the hub and adapter cannot provide this power, the device may not charge properly or may drain the battery.

Best Practices for Maximizing Power Delivery

To ensure that your USB C hub maximizes power delivery, follow these best practices:

Choose the Right Hub: Ensure the hub you choose can handle the power requirements of your device. Look for hubs with high PD ratings (e.g., 100W or more). Use a Compatible Adapter: Match the hub's PD specifications with a compatible power adapter. Using a high-power adapter with a low-power hub can lead to underperformance. Understand Your Device’s Needs: Know the power requirements of your devices. High-end devices like your MacBook Pro will need more power than low-power devices.

In conclusion, understanding the intricacies of Power Delivery in USB C hubs can help you optimize your charging experience. By choosing the right hub, adapter, and understanding the needs of your devices, you can ensure that your MacBook Pro is charged efficiently and effectively.