I am utilizing the TPS63900 in my current design and have a query regarding its operational current consumption. In idle (no load) condition, the TPS63900 consumes 0.3uA. However, when a load is introduced, it appears to draw a comparable amount of current to that consumed by the load itself. I have constructed a load comprising resistors with values of 300 ohms, 600 ohms, 900 ohms, and 2.97 Kilo ohms.
Upon driving the load with and without the TPS63900, the following results are observed: (TPS63900 is set at 3.3V output)
|
Load Value |
Current with TPS63900 connected |
Current without TPS63900 |
|
300 ohms |
12.75 mA |
10.68 mA |
|
600 ohms |
8.6 mA |
5.47 mA |
|
900 ohms |
5.5 mA |
3.68 mA |
|
2.97k ohms |
1.98 mA |
1.13 mA |
I am seeking guidance on understanding why the regulator introduces significant additional consumption in this scenario.
I am using NRF Power Profiler kit II for measurement.
My schematics:
My PCB Layout:
