VREGMAIN is the main regulator of the system.
The device can only be operated in DC/DC mode, but the regulator also has an LDO mode that is used to start up the device.
After reset and device start up, VREGMAIN is enabled and uses LDO. Once the device starts, the DC/DC regulator must be enabled using register VREGMAIN.DCDCEN. When enabling the DC/DC regulator, the device checks if an inductor is connected to the DCC pin. If an inductor is not detected, the device remains in LDO mode. While in LDO mode, register VREGMAIN.INDUCTORDET reports the inductor detection status and is used to detect inductor failure. An inductor failure means the DC/DC mode was not able to start.
VREGMAIN only supports DC/DC mode, which needs external components. For details, see Reference circuitry.