DCDC layout on nRF52832

RE: DCDC layout on nRF52832

Andreas — Thu, 15 Nov 2018 10:12:01 GMT

Hi,

[quote user="Francesco_M"]In this case with LDO enabled are there drawbacks?[/quote]

No, there are no drawbacks. You can leave the inductors mounted, or you can desolder them, it does not matter to the nRF52. My point was, if you already have the inductors mounted, you might as well use the DCDC mode to save some current, even if current consumption is not too important in the respective application.

Best regards,

Andreas

RE: DCDC layout on nRF52832

Francesco_M — Thu, 15 Nov 2018 08:52:39 GMT

Dear Andreas, many thanks for your answer.

I didn't understand If when you wrote "There are no drawbacks with using LDO if the inductors are soldered other than increased current consumption" you refer to extra current consumption due to some leakage or so on in inductors or you refer, in general, to extra current consumption due to LDO mode respect to DCDC mode.
I try to explain better my doubt:

Suppose that we have an application in which there are no high current draws in which LDO mode is convenient respect to DCDC mode but the layout that we use is layout arranged for DCDC (with two inductors mounted). In this case with LDO enabled are there drawbacks? We can leave inductors mounted or it is better desoldered inductors in such a manner to have layout very similar to layout suggested for LDO?

RE: DCDC layout on nRF52832

Andreas — Tue, 13 Nov 2018 08:31:34 GMT

Hi,

With the 10µH and 15 nH inductors between DCC and DEC4 you can use both LDO mode and DCDC mode. There are no drawbacks with using LDO if the inductors are soldered other than increased current consumption.

If you do not have the 10µH and 15 nH inductors in place, you should not use DCDC mode, use LDO only. Enabling the DCDC mode without these inductors will brick your nRF.

Best regards,

Andreas