To maintain a constant output voltage, the linear regulator compares the internal voltage reference to the sampled output voltage and adjusts the resistance of the pass device to null error. A linear regulator is a buck converter, so by definition, the output voltage is always lower than the input voltage.
Linear regulator uses an active (BJT or MOSFET) pass-through device (series or shunt) controlled by a high-gain differential amplifier. It compares the output voltage to a precise reference voltage and adjusts the conduction device to maintain a constant output voltage.
A voltage regulator is a power supply component that ensures a stable and constant voltage supply under all operating conditions. Adjusts the voltage during power fluctuations and load fluctuations. Both AC voltage and DC voltage can be adjusted.
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