US 12,332,675 B2
Low-dropout regulator having bidirectional current adjustment
Zhen-Yang Pang, Shanghai (CN); and Hao Wang, Shanghai (CN)
Assigned to SIGMASTAR TECHNOLOGY LTD., Fujian (CN)
Filed by SigmaStar Technology Ltd., Fujian (CN)
Filed on Dec. 20, 2022, as Appl. No. 18/084,623.
Claims priority of application No. 202210073772.2 (CN), filed on Jan. 21, 2022.
Prior Publication US 2023/0236615 A1, Jul. 27, 2023
Int. Cl. G05F 1/575 (2006.01); G05F 1/59 (2006.01)
CPC G05F 1/575 (2013.01) [G05F 1/59 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A low-dropout regulator, comprising:
a voltage divider circuit, dividing a power supply voltage to generate a predetermined voltage;
an operational amplifier, generating a bias voltage according to the predetermined voltage and an output voltage of an output terminal;
a regulator circuit, generating a first regulated voltage and a second regulated voltage according to the bias voltage; and
an output circuit, adjusting a difference between a first current and a second current according to the first regulated voltage and the second regulated voltage to regulate the output voltage,
wherein the regulator circuit comprises:
a first transistor, generating the first regulated voltage at a first node according to the bias voltage;
a first current source circuit, coupled together with the first transistor to the first node. and biasing the first transistor;
a second transistor, generating the second regulated voltage at a second node according to the bias voltage; and
a second current source circuit, coupled together with the second transistor to the second node, and biasing the second transistor.