Power sequence required for nRF5340 Soc

[shahid Sultan]

I have been reviewing the datasheet of the BLE audio nRF5340. It lists multiple power rails in power section.

Is any power-on sequence required for the SOC.

Also, can we use an LDO or buck converter instead of a PMIC IC (nPM1300)?

[Turbo J]

No, there is only the VDD power rail available. This one is either tied to VDDH or powered from VDDH using internal regulator.

If you tied VDD to VDDH you can use an external converter or LDO for both. See reference circuit No. 2 in the PS as an example.

[shahid Sultan]

Thank you for your response, 

I have one more query regarding the power supplies, as given below.

Can we use the internal DC/DC converter for an Audio BLE application?   

What is the efficiency of the internal DC/DC converter? 

[mathiaso]

Hi, Shahid.

shahid Sultan said:

Can we use the internal DC/DC converter for an Audio BLE application?

The main difference between using internal DC/DC vs. LDO is the current consumption. See, e.g., the radio current consumption.

shahid Sultan said:

What is the efficiency of the internal DC/DC converter?

This isn't publicly documented, but again, see the differences in current consumption between DC/DC and LDO mode.

Best regards,
Mathias