https://devzone.nordicsemi.com/f/nordic-q-a/83187/reg0-dc-dc-converterWe are thinking of making changes to the QIAA aQFN73 circuit configuration from 5 to 4 and use the REG0 DC/DC. VDDH will be connected to a single-cell Li-Ion battery (3~4.2V) directly. VDD (3.3V) will supply other components on the board with total maxen-USTelligent Community 13Wed, 29 Dec 2021 07:56:40 GMThttps://devzone.nordicsemi.com/thread/345319?ContentTypeID=1Wed, 29 Dec 2021 07:56:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c870affc-cb7f-4485-a076-ef2bed4ffbcfBendik Heiskel<p>Hi,</p> <p>There should not be any problems supplying external components from VDD with less than 20mA, but keep in mind that the radio output power must be limited to a maximum of 4dBm. If higher output power is needed a external regulator should be used for the external components.</p> <p>&nbsp;</p> <p>Best regards,</p> <p>Bendik</p><div style="clear:both;"></div>