US 12,169,418 B2
Voltage regulators
John L. Melanson, Austin, TX (US); and John P. Lesso, Edinburgh (GB)
Assigned to Cirrus Logic Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on May 25, 2023, as Appl. No. 18/323,530.
Application 18/323,530 is a continuation of application No. 17/092,569, filed on Nov. 9, 2020, granted, now 11,687,107.
Prior Publication US 2023/0376063 A1, Nov. 23, 2023
Int. Cl. G05F 1/575 (2006.01)
CPC G05F 1/575 (2013.01) 19 Claims
OG exemplary drawing
 
1. A voltage regulator comprising:
an output stage comprising an input node for receiving an input voltage; an output node for outputting an output voltage; and an output device comprising at least one transistor configured to pass an output current to the output node based on a drive voltage at a control node;
a differential amplifier configured in a control loop for the output stage to receive a feedback signal derived from the output voltage at a first input and to receive a reference voltage at a second input and to generate an amplifier output to control the drive voltage of the output stage to minimise any difference between the feedback signal and the reference voltage; and
a controller operable to selectively reconfigure the output stage to provide a change in output current in response to a load activity signal indicative of a change in load activity that results in a change in load current demand for a load connected, in use, to the output node, wherein said reconfiguration of the output stage results in a change of current which is independent of the operation of the control loop such that a given value of amplifier output will lead to a different value of output current before and after the reconfiguration of the output stage.