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A voltage regulator is an electricity regulation device designed to automatically convert voltage into a lower, usually direct current (DC), constant voltage.
The term may refer to a voltage regulator integrated circuit (IC), which is often found in computers and other electronic devices that are plugged directly into an alternating current (AC) wall outlet but require only a small DC voltage.
The term can also refer to voltage regulation or power module devices, such as cell phone and laptop chargers. Some regulators do not increase or decrease a device's voltage, but merely ensure constant output value.
Voltage regulators are usually used to regulate voltage down to a lower value and to provide this value constantly over time. Such a device could be as simple as a feed-forward design or it could be more complex and include negative feedback loops.
There are two kinds of voltage regulators: