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:
Nov. 04, 2008
Filed:
Jan. 17, 2007
Jianbao Wang, Tucson, AZ (US);
Jianbao Wang, Tucson, AZ (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An LDO (low dropout) regulator including a pass transistor having a first electrode coupled to produce an output voltage of the LDO regulator, a control electrode, and a second electrode coupled to receive an input voltage of the LDO regulator. An error amplifier has a first input coupled to a first reference voltage and an output coupled to the gate control electrode of the pass transistor. A first feedback circuit has an input coupled to the first electrode of the pass transistor and an output producing a first feedback voltage coupled to a second input of the error amplifier. The auxiliary amplifier has a first input coupled to a second reference voltage and an output coupled to the output of the error amplifier. A second feedback circuit has an input coupled to the output of the auxiliary amplifier and an output producing a second feedback voltage coupled to a second input of the auxiliary amplifier. The auxiliary feedback loop is used to take over control of the feedback in the LDO regulator at high frequencies.