Hi,
Right now I'm looking down at the nrf52840 datasheet, because I would like to do a project with such MCU, but I got to the part of the integrated DCDC converters and I have a doubt.
At the moment I'm thinking in feed the MCU with an external 3.3V LDO, but in the datasheet there is a schematic that displays we need to wire DCCH pin to VDD pin through an inductor, but in the schematic VDD is outputing voltage VEXT. Can I just connect the DCCH pin to the external LDO's output with an inductor? or...
The project is going to use both battery and sometimes USB, for that approach I'd like to use the BQ25622E, it has a powerpath, do you think it is more efficient to connect directly such powerpath to VCCH or keep the LDO TPS7A02(it has a very low quiescent current 20nA on stand by) to feed VDD pin.?
Will the internal LDO be more efficient than the TPS7A02?
click the image to get a full view
Is the example on the right of the image possible?
Hope your answers 