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nRF52840 efficient power management solution

mosgaard2000

Hi,

I have read a lot of posts about using the internal LDO/DCDC converters or using an external switch mode regulator, but haven't seen any answers I could use.

I have a setup with the nRF52840 that continuous uses 1.8mA for reading/writing to different sensors - this is without the BLE enabled.

If I understand the documentation correct, then it will newer use the internal DCDC regulator, because the BLE is disabled - is this correct?

If it uses the internal LDO to generate the VDD (1.8V in my case), then I only uses 1.8V / 3.85V (Lipo battery) = 46% of the power, while the rest is heat in the LDO - is this correct?

Could I increase my power efficiency by using an external switch mode regulator instead (which operates at low currents)?

Doesn't Nordic have any power calculations, except the one refered to in all other power posts, that only shows power consumption of the BLE?

  • 0

    Hi,

    The internal regulator is the LDO regulator while the external regulator is the DC/DC. The benefit of using the DC/DC regulator is that it's more efficient than the LDO but the drawback is that it requires extra components (two inductors) and more place. When DCDC is enabled then the nRF will use LDO refresh mode in SYSTEM ON IDLE. It will switch to DCDC refresh once any significant current is drawn from a peripheral. The nRF will switch to DCDC normal from DCDC refresh once the radio is used to prevent any added noise. No other power calculations are available  then this one. 

    Regards

    Jared 

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