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An input capacitor is supposed to be positioned very close to the IC, but should I pay attention to the placement of the inductor, output capacitor, or other components?
Because short wiring should be used for switching nodes, the inductor, like the input capacitor, is best located close to the IC. As for the output capacitor, noise can be kept minimal by placement so as to minimize insofar as possible the area of the current loop consisting of the IC SW pin → output inductor → output capacitor → IC PGND (GND) pin.
