this post was submitted on 27 Sep 2024
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You cant use USB PD with USB A
I had to look up what that means. Does it really matter that much? We have fast chargers using A-C cables for phones since far back. Is PD that much better?
Yes, it really is. The USB spec for Type A connectors is 5V @ 1.5A for a max energy output of 7.5W. USB PD 3.0 (which requires the Type C connector) specs for 5V @ 3A (15W), but also provides additional optional mixes of 9V @ 3A (27W), 15V @ 3A (45W), 20V @ 3A (60W), and 20V @ 5A (100W). Adding to this, there is also now USB PD 3.1 EPR (Extended Power Range) which adds 28V @ 5A (140W), 36V @ 5A (180W), and 48V @ 5A (240W).
So, 7.5W of available power vs up to 240W (supposing device and cable support), plus flexibility on negotiated power. This means that there is far more energy available to charge faster and the ability to power many more types of devices that require different voltages.
But wait, there's more. USB PD is also used to enable negotiation of USB Alternate Modes. Currently, only Thunderbolt, MHL, and DisplayPort alt modes are maintained but that's still pretty awesome.