Low drop-out voltage regulator with dynamic voltage control

摘要

A low dropout voltage regulator circuit that dynamically adjusts its output voltage has a voltage adjustment circuit in communication with a dynamic voltage controlling circuit for modifying the output voltage of the low dropout voltage regulator. A first amplification circuit is connected to receive an adjusted reference voltage from the voltage adjustment circuit and compare it with a feedback signal from the output voltage to provide a drive signal to a signal input terminal of a follower output transistor. An output terminal of the follower output transistor provides the output voltage of the regulation circuit. An adjustable internal load circuit applies a load current to the output terminal of the follower output transistor to increase the bandwidth of the output of the voltage regulation circuit that is sensed by a dynamic biasing sensing circuit to generate a dynamic biasing signal that modifies the bandwidth of the first amplification circuit.

主权项

1. A battery powered apparatus comprising:
a low dropout voltage regulation circuit connected to the battery comprising:
a differential comparison circuit having a first input terminal connected to receive an adjustable reference voltage, a second input terminal connected to receive an output feedback signal from an output of the low dropout voltage regulation circuit, and an output terminal to provide a drive signal indicative of the difference between the adjustable reference voltage signal and the output feedback signal;a follower drive transistor having an input terminal in communication with the differential comparison circuit to receive the drive signal and a follower terminal connected to the output terminal of the low dropout voltage regulation circuit to provide the output voltage and current to a load circuit of the battery power apparatus;an adjustable internal current source connected to the output terminal of the low dropout voltage regulation circuit to provide a current for increasing a pole of the output of the low dropout voltage regulation circuit;a voltage adjustment circuit in communication with the differential comparison circuit to modify the adjustable reference voltage to change the output voltage at the output terminal of the low dropout voltage regulation circuit; anda current sense circuit connected to sense the output current that is passed through the follower drive transistor and in communication with the differential comparison circuit to transfer an output current sense signal to increase an internal pole of the low dropout voltage regulation circuit to permit rapid changes in the output voltage with changes to the adjustable reference voltage.