My eval setup is PPK2(source mode) -> nPM1300EV - -> nRF54L15DK. I have my load connected to BUCK2, everything else is disabled.
I'm getting higher than expected input current consumption as measured by the PPK2.
Because nRFDK is a complex load, for the purpose of measurement I connected a 22K Ohm resistor to the output of nPM1300EV which should draw slightly more than the average amount of current as my nRF board. So PK2(source mode) -> nPM1300EV - -> 22K load.
My measurements are thus:
Input voltage 3.6v
Input average current 60uA
Output voltage 1.8v
Load current 81uA
This gives an overall efficiency of 69% which is low. How much can this be improved?
Also, I notice that when I disconnect the load completely there is a quiescent draw of ~8uA, comprised of high (2mA) spikes every 1 second. I assume this is the EV board's host CPU polling the nPM1300?