since it has dc to dc converter, should it work on ALL laptops,. lets say by chane the one i have at my disposal,, is old and has the lowest curent output seen on usb, say below 5 v, will it still prouduce needed curent, or is this dependant on a certian voltage from usb,,

reason i ask is im thinking about seting up a more mobile programing solution,, and just hapen to have a lil hp laptop, i just dont want to buy a second programer, and not be able to use it mobily, it just makes sence to me that even with a dc dc converter it would still require a minimum voltage in,