I am using an Otii Ace Pro to provide power to a small PCBA. The Otii is powered by USB and running in Power Box mode at 4V. When I enable power, a 1.8V LDO on the board turns on, which coincides with a large current spike and voltage dip on the Otii. Ultimately, the board is unable to turn on.
The board does not have this issue with either a small battery or a benchtop power supply. I have tried multiple boards, and also, a coworker does not have any problems with a different Otii Ace Pro. The board should only draw 10’s of mA in normal operation.
Here is a capture of what I’m seeing. The LDO is actually part of a PMIC that repeatedly tries to turn on, which is why the spikes are periodic. Is it possible there is a problem with my Otii Ace Pro?