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What kinds of peripheral components present no problems with respect to performance or noise even when mounted on the surface opposite the IC mounting surface?
Mounting on the surface opposite the IC mounting surface means using vias, and so there is the effect of the inductance component of the vias. From this it can be said that components that tend not to be on the path of a high-frequency current are comparatively unaffected. More specifically, it is likely that for components other than input or output capacitors, capacitors at internal power supply pins, and bootstrap capacitors, the effect of placement on the surface opposite the IC is relatively small. However, any component can be affected by mounting on the rear side of an inductor, in particular directly below the inductor. Also, apart from components, signal lines can also be affected, so caution is required.
