Internal DCDC vs LDO for nRF52 series

[Lakerno]

I will be using a 3.7V LiPo to power my NRF52 system. As far I understand, using the internal DCDC regulator is a better choice as it can save power compared to internal LDO. I assume this the case for most applications.

Can anyone enlighten me what is the use case for internal LDO when you have a internal DCDC already?

[Nenik]

Well, you can't really go directly with 3.7V LiPo, as it is more like 4.2V when charged and that's waaay out of spec. So you'd need some external power management solution anyway to get into acceptable Vdd range, thus likely end up using the LDO as the last step anyway. For nRF51, DCDC was also reducing radio performance (to the point that it was specifically discouraged for older silicon revisions).