Will LDO or DCDC still work under system off mode?

[nine-fox]

Hi Nordic,

I am using one NRF52840 named A chip(DCDC mode) to provide VDD power supply to another NRF52840 named B.

A is using VDDH with battery 4.2V power supply.

B is using VDD only, with VDDH empty.

Just confirm, will power supply still work when A enter system off mode?

Thanks,

Vincent

[ketiljo]

Please see https://infocenter.nordicsemi.com/topic/ps_nrf52840/power.html#unique_2023308650

[nine-fox]

Thanks for your reply！

[ketiljo]

Please note the current limitation: https://infocenter.nordicsemi.com/topic/ps_nrf52840/power.html#unique_1730776566

Where external current draw is defined as the sum of all GPIO currents and the current being drawn from VDD.

So depending on the output power on device A, you may not be able to power device B .