US 12,346,141 B2 · Low dropout regulator

Abstract

A low dropout regulator comprising: a supply voltage connection for receiving a supply voltage; a load voltage output connection for providing a load voltage to a load; load voltage output control circuitry comprising a pass transistor configured to regulate the load voltage based on a voltage at its gate region; adaptive biasing circuitry comprising: a biasing transistor configured to regulate the voltage provided to the gate region of the pass transistor based on a voltage provided to a gate region of the biasing transistor; and operational transconductance amplifier, OTA, circuitry comprising a first OTA transistor and a second OTA transistor, wherein a gate region of the first OTA transistor is arranged to receive a reference voltage and a gate region of the second OTA transistor is arranged to receive a voltage indicative of the load voltage; and adaptive compensation circuitry comprising: (i) a first compensation capacitor having a first electrode and a second electrode, (ii) a second compensation capacitor having a first electrode and a second electrode, and (iii) a first compensation transistor, wherein the second electrode of the first compensation capacitor is coupled to a first region of the first compensation transistor, and wherein the first electrode of the second compensation capacitor is coupled to both a second and a gate region of the first compensation transistor; wherein a first region of the second OTA transistor is coupled to: (i) the supply voltage connection, (ii) the first electrode of the first compensation capacitor, and (iii) the gate region of the biasing transistor; and wherein a second electrode of the second compensation capacitor is coupled to a first region of the biasing transistor.

Claims20

Dependent claims

A low dropout regulator comprising:

a supply voltage connection for receiving a supply voltage;
a load voltage output connection for providing a load voltage to a load;
load voltage output control circuitry comprising a pass transistor configured to regulate the load voltage based on a voltage at its gate region;
adaptive biasing circuitry comprising:
a biasing transistor configured to regulate the voltage provided to the gate region of the pass transistor based on a voltage provided to a gate region of the biasing transistor;
and
operational transconductance amplifier, OTA, circuitry comprising a first OTA transistor and a second OTA transistor, wherein a gate region of the first OTA transistor is arranged to receive a reference voltage and a gate region of the second OTA transistor is arranged to receive a voltage indicative of the load voltage;
and
adaptive compensation circuitry comprising:
(i) a first compensation capacitor having a first electrode and a second electrode, (ii) a second compensation capacitor having a first electrode and a second electrode, and (iii) a first compensation transistor, wherein the second electrode of the first compensation capacitor is coupled to a first region of the first compensation transistor, and wherein the first electrode of the second compensation capacitor is coupled to both a second and a gate region of the first compensation transistor;
wherein a first region of the second OTA transistor is coupled to:
(i) the supply voltage connection, (ii) the first electrode of the first compensation capacitor, and (iii) the gate region of the biasing transistor;
and
wherein a second electrode of the second compensation capacitor is coupled to a first region of the biasing transistor.

11 more elements

An electrical circuit comprising a load and a low dropout regulator, wherein the regulator is coupled to the load and configured to regulate a load voltage provided to the load;

wherein the regulator comprises:
a voltage input connection for receiving a supply voltage;
load voltage output circuitry comprising a pass transistor comprising a first region, a second region and a gate region, wherein the second region of the pass transistor is coupled to the load, and wherein the pass transistor is configured to regulate the load voltage provided to the load based on a voltage at its gate region;
adaptive biasing circuitry comprising:
a biasing transistor configured to regulate the voltage provided to the gate region of the pass transistor based on a voltage provided to a gate region of the biasing transistor;
and
operational transconductance amplifier, OTA, circuitry comprising a first OTA transistor and a second OTA transistor, wherein a gate region of the first OTA transistor is arranged to receive a reference voltage and a gate region of the second OTA transistor is arranged to receive a voltage indicative of the load voltage;
and
adaptive compensation circuitry comprising:
(i) a first compensation capacitor having a first electrode and a second electrode, (ii) a second compensation capacitor having a first electrode and a second electrode, and (iii) a compensation transistor, wherein the second electrode of the first compensation capacitor is coupled to a first region of the compensation transistor, and wherein the first electrode of the second compensation capacitor is coupled to both a second region of the compensation transistor and a gate region of the compensation transistor;
wherein a first region of the second OTA transistor is coupled to:
(i) the supply voltage connection, (ii) the first electrode of the first compensation capacitor, and (iii) the gate region of the biasing transistor;
and
wherein a second electrode of the second compensation capacitor is coupled to a first region of the biasing transistor.

11 more elements

Dependencies are inferred from the claim text.

Low dropout regulator

Life of this patent

Low dropout regulator

Life of this patent

Abstract

Claims20