How to disable DC-DC converter on nRF54L device

[NandanS]

Hi all,

I’m working with an nRF-based board and need to via software disable the internal DC-DC converter and use the LDO exclusively for testing purposes. I’m unclear on:

• How to do this?
• When I can do this action for it to properly take effect?

Could someone clarify the correct approach and any side effects I should be aware of? I’m aiming for predictable power behavior and want to ensure compatibility across sleep states.

[AHaug]

Hi,

The nRF54L15 only supports DC/DC. From the 54l15 datasheet chapter 5.7.1:

"5.7.1 VREGMAIN — Main regulator VREGMAIN is the main regulator of the system. The device can only be operated in DC/DC mode, ....", i.e any workaround you do to only use the internal LDO, will result in limitations both w.r.t peak limit current and power consumption in general. 

What type of device are you aiming for here? On the grid devices/devices that don't care about current consumption may be an option for the non-supported LDO, but I can't state that it will work since the device is not characterized for LDO only.

Kind regards,
Andreas