Two boards with the nRF54L15 (custom design, battery directly on VDD ~3 V, VREGMAIN in DC-DC mode, NCS v3.2.3) draw several mA continuously. Other boards of the same design, running the same firmware, average ~14 µA.
Supply current measured with a PPK2 in source mode (median):
| Supply | 0.8 V | 1.0 V | 1.2 V | 1.4 V | 3.0 V |
|---|---|---|---|---|---|
| Normal board | 0 µA | 0 µA | 1 µA | 25 µA | 39 µA |
| Board A | 1.1 mA | 1.5 mA | 1.6 mA | 1.9 mA | 4.4 mA |
| Board B | 3.0 mA | 23 mA | 49 mA | 4.9 mA | 8.4 mA |
On Board A, all circuitry except the nRF54L15 was removed and the current did not change. After the external DC-DC components were also removed, the current dropped to ~200 µA.
Is this a known issue, and how can we determine the cause?
