LOW-DROPOUT VOLTAGE REGULATOR, AND OPERATING METHOD OF THE REGULATOR

摘要

PURPOSE: A low dropout voltage regulator and an operation method thereof are provided to improve the slew rate of an output voltage outputted from a LDO voltage regulator by adding MOS transistor form switches and comparators. CONSTITUTION: An error amplifier(120) is biased to an input voltage. The error amplifier compares a reference voltage with a feedback voltage. The error amplifier outputs an error signal. A first MOS transistor(M1) includes a gate, a source, and a drain. The gate is connected to the error signal. The source is connected to the input voltage. The drain is connected to the output voltage. A voltage divider(140) feeds back a part of the output voltage to the error amplifier. A level limiter(130) restricts the level of the output voltage.