# US 2024/0201721 A1 · Low dropout regulator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0201721 A1 - Document ID: US20240201721A1 - Status: Published application - Kind: A1 - Application number: 18/083,229 - Filed: 2022-12-16 - Published: 2024-06-20 - Earliest claimed: 2022-12-16 - Assignees: Renesas Electronics Corporation - Applicants: Renesas Electronics Corporation - Inventors: Nishant Singh THAKUR - Web page: https://patentgrep.com/patent/US20240201721A1 ## CPC - G05F 1/575: characterised by the feedback circuit - G05F 1/462: {as a function of the requirements of the load, e.g. delay, temperature, specific voltage/current characteristic} - G05F 1/565: sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor (G05F1/563 takes precedence) - G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES ## Abstract A low dropout regulator for providing an output voltage, the low dropout regulator comprising a resistive device configured to contribute to the stability of the low dropout regulator during operation and to have a resistance that is dependent on a load current. ## Claims ### Claim 1 A low dropout regulator for providing an output voltage, the low dropout regulator comprising a resistive device configured to contribute to the stability of the low dropout regulator during operation and to have a resistance that is dependent on a load current. ### Claim 2 (depends on 1) The low dropout regulator of claim 1 comprising: a first amplifier comprising: i) a first input terminal for receiving a reference voltage; ii) a second input terminal for receiving a feedback voltage; and iii) an output terminal; and a regulator transistor comprising a gate terminal coupled to the output terminal of the first amplifier. ### Claim 3 (depends on 2) The low dropout regulator of claim 2 comprising: a first resistive element; and a second resistive element; wherein: the regulator transistor, the first resistive element and the second resistive element are coupled in series; the regulator transistor and the first resistive element are coupled at an output node for providing the output voltage; the first resistive element and the second resistive element are coupled at a feedback node for providing the feedback voltage, the feedback node being coupled to the second input terminal of the first amplifier; the regulator transistor is coupled to a first voltage terminal; and the second resistive element is coupled to a second voltage terminal. ### Claim 4 (depends on 3) The low dropout regulator of claim 3, comprising a first capacitor coupled to the second input terminal of the first amplifier and configured to contribute to the stability of the low dropout regulator during operation. ### Claim 5 (depends on 4) The low dropout regulator of claim 4, wherein the first capacitor is configured to contribute to the stability of the low dropout regulator during operation by cancelling a pole at the second input terminal of the amplifier. ### Claim 6 (depends on 3) The low dropout regulator of claim 3 comprising a load device coupled to the output node, the load current being provided across the load device during operation. ### Claim 7 (depends on 6) The low dropout regulator of claim 6, wherein the load device comprises a first terminal coupled to the output node and a second terminal coupled to the second voltage terminal. ### Claim 8 (depends on 1) The low dropout regulator of claim 1, wherein the resistive device comprises a first negative threshold transistor. ### Claim 9 (depends on 8) The low dropout regulator of claim 8, wherein the resistive device comprises a first transistor coupled in series with the first negative threshold transistor. ### Claim 10 (depends on 9) The low dropout regulator of claim 9, wherein the resistive device comprises a second transistor coupled in series with a second negative threshold transistor, the series coupling of the first negative threshold transistor and the first transistor being coupled in parallel with the series coupling of the second negative threshold transistor and the second transistor. ### Claim 11 (depends on 3) The low dropout regulator of claim 3, wherein the resistive device is coupled to the output node, the output terminal of the first amplifier and the first voltage terminal. ### Claim 12 (depends on 11) The low dropout regulator of claim 11, wherein the resistive device comprises a first negative threshold transistor. ### Claim 13 (depends on 12) The low dropout regulator of claim 12, wherein the resistive device comprises a first transistor coupled in series with the first negative threshold transistor. ### Claim 14 (depends on 13) The low dropout regulator of claim 13, wherein the first negative threshold transistor comprises a first terminal coupled to the output node and a second terminal coupled to a first terminal of the first transistor. ### Claim 15 (depends on 14) The low dropout regulator of claim 14, wherein the first transistor comprises a second terminal coupled to the first voltage terminal and a gate terminal coupled to the output terminal of the first amplifier. ### Claim 16 (depends on 15) The low dropout regulator of claim 15, wherein the resistive device comprises a second transistor coupled in series with a second negative threshold transistor, the series coupling of the first negative threshold transistor and the first transistor being coupled in parallel with the series coupling of the second negative threshold transistor and the second transistor. ### Claim 17 (depends on 16) The low dropout regulator of claim 16, wherein the second negative threshold transistor comprises a first terminal coupled to the output node and a second terminal coupled to a first terminal of the second transistor. ### Claim 18 (depends on 17) The low dropout regulator of claim 17, wherein the second transistor comprises a second terminal coupled to the first voltage terminal and a gate terminal coupled to the output terminal of the first amplifier. ### Claim 19 (depends on 18) The low dropout regulator of claim 18, wherein the second terminal of the second negative threshold transistor is coupled to the first terminal of the second transistor via a third resistive element and/or the first terminal of the second transistor is coupled to the output node via a fourth resistive element. ### Claim 20 A method of providing an output voltage, comprising: providing a low dropout regulator for providing an output voltage; wherein the low dropout regulator comprises a resistive device configured to contribute to the stability of the low dropout regulator during operation and to have a resistance that is dependent on a load current.