nPM1300 PMIC not powering consistently with nRF9151 custom PCB

RE: nPM1300 PMIC not powering consistently with nRF9151 custom PCB

Kazi Afroza Sultana — Tue, 11 Nov 2025 14:23:59 GMT

Hello,

You can try to look at this errata nPM1300_Rev_2_Errata_v1.1.pdf.

RE: nPM1300 PMIC not powering consistently with nRF9151 custom PCB

Rahul Chavda — Wed, 05 Nov 2025 06:45:05 GMT

Hello Nordic Team,

We are using nRF9151 with nPM1300 PMIC and some other peripheral devices in our custom design.

We have observed an issue with LDO1 on the nPM1300.
When we power the system from a battery (connect or disconnect the battery), sometimes LDO1 does not start properly — instead of 1.8 V, we see random voltages between 300 mV to 700 mV.

RE: nPM1300 PMIC not powering consistently with nRF9151 custom PCB

Kazi Afroza Sultana — Tue, 04 Nov 2025 08:40:34 GMT

I can see you also have LDO1 and LDO2 for additional 1.8V and RTC supplies.

We have an errata [41] LOADSW/LDO: LDO startup might cause reset for Engineering revision E about the resetting of the device at LDO startup due to voltage drop on VBAT. When the device is powered from VBAT, LDO is supplied by VSYS; If VBAT voltage level goes below 300mV during starting up in LDO mode, device resets.

You can also check if VDDIO and VOUT1 is connected by jumper.

Thanks.

Kazi

RE: nPM1300 PMIC not powering consistently with nRF9151 custom PCB

Kazi Afroza Sultana — Tue, 04 Nov 2025 07:58:47 GMT

Hello,

The nPm1300 requires a startup VSET condition for the BUCK regulators (for VOUTs). Can you check your VSET pins are not floating? It could be one of the reasons for not powered up by nPM1300 consistently.

The default set up has jumpers to connect VSET1 and VSET2 to fixed resistors ((RSET1 = 47 kΩ for 1.8 V, RSET2 = 100 kΩ for 3.0 V)) or to GND for disabling

VSETs. source: BUCK startup configuration