USB 2.0 header supports up to 5 amps, while USB 3.0 header can handle up to 5 amps as well.
USB 2.0 header supports up to 5 amps, while USB 3.0 header can handle up to 5 amps as well.
I'm handling a project with a SBC that requires offboard power from the motherboard standby. My main choices seem to be the USB 2.0/3.0 connectors, as they remain active even when the system is powered down. My specs indicate a need for 5V DC at 4A using a 5.5/2.1mm jack. I'm considering converting the DC jack to a USB A port and then linking it to the motherboard headers. My concern is whether a single USB 3.0 header can deliver the required amperage, or if combining the 3.0 and 2.0 headers is necessary. Regarding power adaptation, I’m unsure about converting the USB header to a DC jack—this seems like a less ideal route but possibly my only path forward.
USB 2.0 delivers around 500mA; USB 3.0 typically uses about 950mA overall. The 5V output isn’t usually designed to handle such high currents initially, let alone extracting it from USB connections.