Hi,
I'm using the published nRF54L15 DK hardware files and noticed something that I don't understand.
On the nPM1300 section of the schematic and PCB:
- Pin 20 (VSYS) is connected to the
P5V0rail. - Pin 30 (LSIN2/VINLDO2) is also connected to
P5V0, which makes sense as the load switch input. - However, Pin 32 (VOUT2, BUCK2 output) also appears to be connected to the same
P5V0rail.
Looking at the PCB layout, it appears that pins 20, 30, and 32 are all on the same copper connection.
In the nPM1300 Product Specification:
- VOUT2 is described as the output of BUCK2.
- BUCK2 is an independent regulator.
- The reference configurations either use BUCK2 as a separate regulator or leave it unused.
I couldn't find any documentation explaining why VOUT2 is connected to VSYS on the DK.
Is BUCK2 intentionally disabled and VOUT2 repurposed in this design, or is there another reason for tying VOUT2 to the VSYS/P5V0 rail?
I know VSET 2 is grounded and cannot switch the regulator on
I'm designing custom hardware based on the nPM1300 and would like to understand whether this is a recommended design practice or is this something specific to the DK implementation.