LOW DROPOUT LINEAR REGULATOR WITH INTERNALLY COMPENSATED EFFECTIVE SERIES RESISTANCE

摘要

To improve frequency response of an LDO regulator and operation of an external circuit.SOLUTION: A voltage regulator circuit having an internally compensated effective series resistance includes a control circuit to generate an out current at a regulated output voltage based on a reference voltage. The control circuit includes an amplifier, a resistive element to feedback an output voltage to an input of the amplifier, and a compensation circuit to couple the internally compensated effective series resistance into the control circuit. The compensation circuit includes a first current sense device to generate a first sensed current proportional to a current through an N-type pass device, a second current sense device arranged to generate a second sensed current proportional to the current through the N-type pass device, and a bias circuit coupled to sink the first sensed current and the second sensed current to reduce a bias voltage across the resistive element below a threshold voltage.SELECTED DRAWING: Figure 1