Boost converter
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A boost converter or step-up converter is a DC-to-DC converter that increases voltage, while decreasing current, from its input to its output.
Low-cost converter modules: two boost and one buck.
Left is a boost converter from a TI calculator, originally generating 9 V from 2.4 V provided by two AA rechargeable cells (right is an added 9 V battery snap connector).
Buck converter
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A buck converter or step-down converter is a DC-to-DC converter which decreases voltage, while increasing current, from its input to its output. It is a class of switched-mode power supply. Switching
Boost converter
…of two distinct states (Figure 2): The input current is the same as the inductor current, as shown in Figure 2. So, it is not discontinuous as in the buck converter, and the requirements on the input filter are relaxed compared to a buck converter. When a boost converter operates in continuous mode, the current…
Fig. 10: Closeup picture of a multiphase CPU power supply for an AMD Socket 939 processor. The three phases of this supply can be recognized by the three black toroidal inductors in the foreground. The smaller inductor below the heat sink is part of an input filter.