Nicely laid out on a black PCB, the 5V USB-C Dual Supply is a neat little device that takes two USB C inputs and safely combines the power lines and one of the data lines (port A) to a single output USB C connector.
Using MOSFETS to create an ideal diode arrangement it equalises the current draw across the two inputs, A and B, to share the workload of powering a connected device on the output. The ideal diode method prevents power from leaking back out through either of the input ports.
In use, this board can be called upon to create redundancy in power supplies, for example using a mixture of mains supplied USB and a battery or power bank. It also means that it’s possible to change the power supplied to a device without any interruption. Perfect for perhaps taking a Raspberry Pi for a walk on battery power after configuring the project using a mains supply.