https://devzone.nordicsemi.com/f/nordic-q-a/69704/switching-between-dcdc-and-ldo-power-supplyHi We are using Nordic NRF52840 in our design. Normally we are using DCDC mode with VDD and VDDH together [Normal mode] connected to 2.2V. In a special case we wanted to switch DCDC to LDO mode to mitigate a failure situation. Later we want to switchen-USTelligent Community 13Mon, 21 Dec 2020 13:37:29 GMThttps://devzone.nordicsemi.com/thread/286060?ContentTypeID=1Mon, 21 Dec 2020 13:37:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c965d34c-f86b-4a58-aeb6-cfb262382663Stian R&#248;ed Hafskjold<p>Hi, you can enable and disable the DCDC regulator seamlessly. There will be no resets. The DCDC regulator is already being switched on and off automatically by the internal power management.</p> <p>If DCDC is enabled the regulator switches between ULP mode and DCDC.</p> <p>If DCDC is disabled the regulator switches between ULP mode and LDO.</p> <p>ULP (ultra low power) is a type of LDO regulator which is only used for low current draws because of the very low quiescent current.</p> <p>If you use the softdevice you can use the softdevice API <a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s140.api.v7.2.0/group___n_r_f___s_o_c___f_u_n_c_t_i_o_n_s.html?cp=4_7_4_1_2_7_2_13#ga84bd6a0e8f55a7aa85a5ec608edd61fe">nrf_power_dcdc_mode_set()</a>, otherwise you can use the register directly.</p><div style="clear:both;"></div>