What I am doing: I am making a wearable device which will use Li-po battery/ies to operate. I am measuring small currents (meaning I want to avoid buck/boost converters). My design draws a current of ~56mA.
What I want to achieve: I need 5V on the device, which should be as voltage-ripple-free as possible. so the way I think of it, using Li-po batteries as power source, I have two options:
- Use two Li-po batteries in series, so I always have a voltage of at least 7V, and use Op-amp to output always 5V to my circuit. This way, I do not need to use a buck converter. Like this:
The above option has the disadvantage that I need two batteries to operate the whole circuit.
- The option I do not want to use, is to have only one battery and use a boost converter to boost the voltage to 5V. I want to avoid that since it will introduce switching to my circuit.
And my question is: is there a way to pump/boost voltage to a higher voltage, without introducing noise like a boost converter would? (The reverse with downscaling using op-amp in my first option). I think there might be a way using Op-amps, which I do not know of.