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What kinds of problems might occur owing to a ground that includes circuits in the vicinity of a DC/DC converter? In particular, I'd like to know about measures for dealing with the PSRR (power supply rejection ratio) and common-mode noise.
If the ground for circuits near the DC/DC converter is not appropriate, normal operation may not be possible, desired characteristics may not be obtained, and unwanted noise could occur. In such cases, the PSRR may be lower than the IC value (specification), or the common-mode noise level may be high. As countermeasures, it is recommended that the ground be made more robust by providing vias near the IC, increasing the ground area, and the like.