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Switching buck converters reduce an input voltage to a lower, regulated voltage much more efficiently than linear regulators.
Buck-boost and SEPIC converters work with input voltages that are higher than, equal to, or lower than the regulated output voltage, making them especially well-suited for battery-powered applications in which the battery voltage begins above the desired output voltage and drops below the target as the battery discharges.
Boost converters generate a regulated output voltage that is higher than the input voltage.
These shunt regulators can protect power supplies from voltage spikes generated by motor controllers they are connected to.