I want to power a led matrix of 256 leds and my controller on the road.
I calculated an approximation of the required current for the leds at 5.1A and the controller at 0.1A making 5.2A @5v together, though I think it will be lower depending on the animations.

I happen to have a 13600 mAh powerbank from Xiaomi lying around which supports quick charge through 2 micro usb outputs. 2.4A @ 5v.

I was thinking if I could combine these in parallel to increase current that would make 4.8A. Now that is slightly less but I could just dim the leds a little bit to make up for that last little bit.

Do you think that would be possible? I came up with the following circuit but as a starting embedded software engineer my experience is still limited so I might be missing something.

Basically, I just want to put the outputs in parallel and have a diode to protect against current flowing back into an output from another output and use a capacitor for peaks.

[![sketch](https://i.stack.imgur.com/IqRH8.jpg)](https://i.stack.imgur.com/IqRH8.jpg)