I'm currently working on a project which features an Analog Devices Blackfin DSP Digikey link. This DSP requires 1.3V to power the core. I plan on having my project be battery powered, thus I'm looking for efficient power regulators.
I've noticed in a lot of schematics that use this chip (and other DSPs in general), the core voltage is typically regulated via an LDO. I understand that LDO regulated power will be cleaner then a switched power supply, but an LDO would be less efficient given that I will be stepping down from 3.3V.
I wasn't able to find anything in the Blackfin datasheet regarding maximum core voltage ripple. So my question: is it 'ok' to use a switched power supply to power a processor core?