Low-drop-output type voltage regulator and RF switching control device having the same

摘要

A low-drop-output type voltage regulator may include an error amplifier providing a gate signal depending on a voltage difference between a reference voltage and a feedback voltage, a semiconductor switch adjusting a current between an input terminal receiving a battery voltage and a ground, in response to the gate signal, a feedback circuit dividing and detecting a detection voltage in a detection node between the semiconductor switch and the ground and providing the feedback voltage, a voltage sensor sensing the battery voltage, and a feedback voltage controller adjusting a level of the feedback voltage depending on the sensed battery voltage.

主权项

1. A low-drop-output type voltage regulator comprising:
an error amplifier configured to provide a gate signal depending on a voltage difference between a reference voltage and a feedback voltage; a semiconductor switch configured to adjust a current between an input terminal receiving a battery voltage in response to the gate signal and a ground; a feedback circuit configured to divide and detect a detection voltage in a detection node between the semiconductor switch and the ground and providing the feedback voltage; a voltage sensor configured to sense the battery voltage; and a feedback voltage controller configured to adjust a level of the feedback voltage depending on the sensed battery voltage, wherein the feedback voltage controller decreases the feedback voltage when the battery voltage is increased, and increases the feedback voltage when the battery voltage is decreased.