RE: nRF52840 VDD output current maximum (Reg0 DCDC )

Robin M Saltnes — Mon, 12 Oct 2020 13:56:39 GMT

Hi Marien

As Jörg is pointing out the maximum external current the nRF52840 can provide is the 25 mA as specified in the datasheet. This is because the max current draw specified in the datasheet is the sum of all GPIO currents and is not affected by the chip's internal power consumption. The limiting factor is not how much power that's available to the chip, but how much current the chip can handle to put out through the GPIOS. Which is rated at 25 mA when the chips output power is set to 4 dBm or less. Anything more than this, i.e running the chip with even lower output powers, is outside of our spec and have not been validated by us.

I would suggest powering your flash directly from the battery via an external Low-dropout regulator or DC-to-DC converter.

Best regards

Robin

RE: nRF52840 VDD output current maximum (Reg0 DCDC )

Turbo J — Sun, 11 Oct 2020 20:30:19 GMT

[quote userid="94200" url="~/f/nordic-q-a/66975/nrf52840-vdd-output-current-maximum-reg0-dcdc"]Our question is about the DCDC it's self. How much current can it deliver?[/quote]

25mA, as specified in datasheet.

if your flash needs 50mA, put an external DCDC/LDO in your schematic.