AnsweredAssumed Answered

PF3000: Different skipping behaviour

Question asked by corono on Nov 14, 2019
Latest reply on Nov 15, 2019 by corono

Hi

 

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.

 

VDD_ARM:

Under no load condition, the VDD_ARM voltage is in skipping mode:

VDD ARM No Load

 

Increasing the load shifts from skipping mode to continuous mode:

VDD ARM 1 CPU

VDD ARM 2 CPU

 

Everything as expected.

 

VDD_SOC:

The behavior of VDD_SOC is quite different. Under no (extra) load condition:

VDD SOC No Load

 

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.

VDD SOC Benchmark

 

Can anyone explain this behavior?

 

Thanks!

 

Sebastian

Outcomes