We are using BQ25570 on our design, and we are noticing a very strange issue.
If v_bat is powered from a supercapacitor (~3.5v up to 4.0), regulated output is only ~0.6V instead of 1.8v. If v_bat is powered from a regulated power source (3.3V from usb), then v_out shows the expected output of 1.8v.
For some reason v_out is only 0.6v if powered from a supercacitor, and correct 1.8v if powered from regulated usb hub. Any idea why this might be the case?