I would only add that my experience of a charge pump on a Chinese BoB with no worthwhile knowledgeable support coming from the supplier (in Devon), I ended up disabling it and have a switch for my spindle (so I can change a tool without losing another finger end) and a switch for the air blower.

That was when I first started using Mach3, I probably could figure out how to enable it properly now, but it isn't on the BoBs I use now and I have got used to being without it

Cheers,

Rob