[14] REGULATORS: Supply regulators default to LDO mode after reset

1. The device current consumption will be higher. Exactly how much higher depends on the difference in efficiency in DC/DC and LDO regulators at a given supply level and the current draw of the device.
2. The device is qualified using DC/DC converters. Qualifications and certificates created without DC/DC converters will hence be void.

Application software needs to set the regulators into DC/DC mode before starting up the modem. Set registers at startup as described below. For secure mode:

 
*((volatile uint32_t *)0x50004A38) = 1;
NRF_REGULATORS_S->DCDCEN = REGULATORS_DCDCEN_DCDCEN_Enabled << REGULATORS_DCDCEN_DCDCEN_Pos;

For non-secure mode:

 
*((volatile uint32_t *)0x40004A38) = 1;
NRF_REGULATORS_NS->DCDCEN = REGULATORS_DCDCEN_DCDCEN_Enabled << REGULATORS_DCDCEN_DCDCEN_Pos;