Adjustable output dc-dc conversion


Thread Starter


I'm looking for a solution for a project of mine, but I'm pretty stuck.

Can you guys help me about a circuit solution, so the case is:
I've got a Li-ion 18650 high current battery cell, which has an output of eg.: 3.4 to 4.2 volts.

This is the voltage that I want to convert to the range of 2.7 to 12V.

The output load would be in the range of 0.2 to 3 Ohms, so the output current is pretty high.
The adjusting should be real time, it would be managed or adjusted by a Microcontroller. I thought about using a synchronous buck/boost converter, but I'm stuck with the scaling of the inductivity, and the output capacitor. And I really cannot find anything about the PWM signals that control the switches(in this case, high power MOSFETs), what should be the duty cycle of the signals and stuff like that.

The other question of mine is that is there any solution that can manage this problem?
To be clear I'm not asking you for a solution, and for you guys to completely do my project. I'm just desperately asking for a starting point.