Importance

Loading Importance Indicators...

Abstract

Techniques pertaining designs of LDO voltage regulators are described. According to one design, the LDO voltage regulator comprises: a differential amplifier circuit having a pair of input terminals and an output terminal, one of the input terminals coupled to a predetermined reference voltage; an intermediate amplifier circuit having an output terminal and an input terminal coupled to the output terminal of the differential amplifier circuit; and an output pass circuit comprising a pass transistor, an output resistor and an output capacitor, the pass transistor having a control terminal coupled to the output terminal of the intermediate amplifier circuit, an input terminal coupled to a power supply and an output terminal coupled to one terminal of the output resistor, the other terminal of the output resistor taken as a voltage output node, the output capacitor coupled between the voltage output node and a ground reference; a feedback circuit including a pair of ladder resistors coupled in series between the voltage output node and the ground reference, a node between the ladder resistors coupled to the other one of the input terminals of the differential amplifier circuit; and a voltage controlled current source circuit having an input terminal coupled to a node between the pass transistor and the output resistor of the output pass circuit and an output terminal coupled to the node between the ladder resistors.

Loading the Abstract Image...

First Claim