US 12,276,993 B2
Charge pump based low dropout regulator
Darshan Chandrashekhar Pande, Aurangabad (IN); Chulkyu Lee, San Diego, CA (US); Sajin V Mohamad, San Diego, CA (US); and Suresh Naidu Lekkala, Bangalore (IN)
Assigned to QUALCOMM INCORPORATED, San Diego, CA (US)
Appl. No. 17/928,174
Filed by QUALCOMM Incorporated, San Diego, CA (US)
PCT Filed Apr. 15, 2021, PCT No. PCT/US2021/027440
§ 371(c)(1), (2) Date Nov. 28, 2022,
PCT Pub. No. WO2022/019969, PCT Pub. Date Jan. 27, 2022.
Claims priority of application No. 202041031744 (IN), filed on Jul. 24, 2020.
Prior Publication US 2023/0221744 A1, Jul. 13, 2023
Int. Cl. G05F 1/575 (2006.01); H02M 3/07 (2006.01)
CPC G05F 1/575 (2013.01) [H02M 3/07 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A voltage regulator, comprising:
a pass transistor coupled between an input of the voltage regulator and an output of the voltage regulator;
an amplifier having a first input coupled to a reference voltage, a second input coupled to the output of the voltage regulator via a feedback path, and an output; and
a voltage booster having an input coupled to the output of the amplifier and an output coupled to a gate of the pass transistor, wherein the voltage booster comprises:
a first capacitor;
a second capacitor;
a first switch coupled between the input of the voltage booster and a first terminal of the first capacitor;
a second switch coupled between the input of the voltage booster and a first terminal of the second capacitor;
a third switch coupled between the first terminal of the first capacitor and the output of the voltage booster, wherein the third switch has a control input coupled to the first terminal of the second capacitor; and
a fourth switch coupled between the first terminal of the second capacitor and the output of the voltage booster.