On a custom board design, I'm using the PF3000A1 for the power supply of an IMX7D. The VDD_ARM voltage is connected to SW1A (1.1V), the VDD_SOC is connected to SW1B (1V). I'm measuring the current through the inductance and found a strange skipping behavior of the PMIC.
Under no load condition, the VDD_ARM voltage is in skipping mode:
Increasing the load shifts from skipping mode to continuous mode:
Everything as expected.
The behavior of VDD_SOC is quite different. Under no (extra) load condition:
This does not look like skipping mode for me, more like a current limit. Increasing the load increases the peak current, but the behavior is still the same.
Can anyone explain this behavior?