I’d like to use the 5V Step-Up/Step-Down regulator (item 2870, S9V11F5S6CMA) to provide 5V input to a raspberry pi zero w from a 3.7V Li-ion battery pack. It needs to be a boost+buck converter because the battery pack is being charged from a 6V solar panel connected to a charge controller that will either give juice straight from the panel in sunlight (nearly 7V) or from the battery if at night.
The problem is that the boost+buck converter seems to regulate to only 3.9V, no matter what input voltage I apply. To test it, I adjusted the input voltage from 3V to 12V, and the output voltage is always 3.9V. I haven’t done anything with the adjustable low-voltage cutoff. Any advice?
Thanks!