Power supply voltage for nrf52 SoC

[Lakerno]

Does nrf52 SoC consumes the same current at different supply voltages(assuming similar operating conditions) ? For eg what is the difference between operating the nrf52 at 1.8V or 3V for current consumption?

In my design I am using a li-ion battery to power NRF52 SoC at 1.8V. Some of the other logic require 3V. So does it make sense to use 1.8V for NRF52, from a power savings point of view??

[FormerMember]

I can see 3 situations which I'll list in ascending order of power consumption I think it would result in:

1. Using the 3V supply with DC-DC. The DC-DC of nrf52 is optimized for itself. The DC-DC goes into a refresh mode when the load current is low.

2. Using 1.8V supply with DC-DC. Here your external DC-DC and nrf52's internal one are used.

3. Using 1.8V supply with LDO. There will be 0.5V drop over the LDO resulting in some power loss. But not as much as when 3V supply is used.

[FormerMember]

You can find the values for the CPU and radio power consumption with 3V supply using DC-DC (situation 1) and LDO in the datasheet. With 1.8V supply the values are not provided in the datasheet, but I'm guessing it'll be between these two.