Hi
I'm having an issue with my NPM1300. drawing high current. I've had 50 of these boards fabricated and the majority are fine, but with the same hw configuration, same fw i sometimes see high current draws of varying between 1 and 7mA.
I've narrowed it down to the NPM1300 in the following manner:
- First, i place the PPK2 in series with my battery and measure current during my BLE advertising state and get 1-7mA dependent on the board. On a good board i get 20uA.
- I then, one by one isolate VOUT1 and VOUT2 of the NPM1300 and place the ppk2 in series with all downstream circuitry. I see in the case of VOUT1 i get nanoamps which is expected, and in the case of VOUT2 i see 20uA which is expected because this is powering an NRF52840 which is advertising.
I've included some screenshots from power profiler. the first shows a good board measured on the battery, the next two are examples of bad boards and the next two are isolating the vout1 and vout2 on a bad board.
Firstly, Do you agree in that case that it is likely the npm1300 is the cause?
and secondly do you have any ideas what might be causing such a high current draw?
I've included a snip of my schematics for the power supply, along with the layout.
below are the specs for the components in this part of the circuit:
1uF ±10% 10V X5R 0603 |
10uF ±10% 10V XS6 0603 |
L1 = Samsung CIGT201610EH2R2MNE |