Decoupling double duty

We should remember that the control circuitry usually needs good local decoupling of its own. And for that we need to provide a small ceramic capacitor very close to the IC. Clearly, especially when dealing with switchers, the decouphng ceramic for the power stage can often do double-duty as the decoupling capacitor of the control too (note that this applies to the Buck-Boost and the Buck only, since a power input decoupling capacitor is only required for them). 

---