Is DC/DC regulator enabled in nrf52 series?

[Nakul Nair]

Hi,

I am using ble_app_beacon example and I want to know if DC/DC is enabled by default in the app or should it be enabled like in nrf51 series?

[Matevz B]

This information explains the last post:

In debug mode only the LDO regulator is enabled (no DCDC, no ULP) and since the LDO is not a switching supply you will get a very stable output voltage in debug mode. After doing a debug reset or pin reset the chip might end up in debug mode (even after disconnecting the debugger), so that probably explains why it looks stable after resetting through SWDebug. After a power cycle, the chip is not in debug mode any longer, and the regulators start to switch.

(Originaly posted by Stian here: https://devzone.nordicsemi.com/f/nordic-q-a/63221/vdd-generated-from-vddh-is-unstable-without-connected-debuger-and-with-non-started-soft-device/266227?focus=true)