The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 2019
Filed:
Dec. 05, 2018
Wuhan Xinxin Semiconductor Manufacturing Co., Ltd., Wuhan, Hubei, CN;
Yuan Tang, San Jose, CA (US);
WUHAN XINXIN SEMICONDUCTOR MANUFACTURING CO., LTD., Wuhan, Hubei, CN;
Abstract
A low drop-out (LDO) regulator including a first operational amplifier, a first transistor, a second transistor, a voltage feedback circuit and a charge pump is disclosed. Each of the first transistor and the second transistor is coupled between supply voltage and an output voltage. The first operational amplifier outputs a first gate-controlled voltage to turn the first transistor on or off. A second gate-controlled voltage is provided to the second transistor to turn it on or off. The charge pump makes the second gate-controlled voltage equal to the sum of the output voltage, a threshold voltage of the second transistor and a drive voltage of the second transistor. The voltage feedback circuit provides a feedback voltage to the first operational amplifier. The first gate-controlled voltage is positively correlated to the feedback voltage. The first transistor is a P-channel field effect transistor; the second transistor is an N-channel field effect transistor.