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:
Feb. 03, 2004
Filed:
Oct. 15, 2002
J. Patrick Kawamura, Allen, TX (US);
James L. Krug, Dallas, TX (US);
David W. Evans, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A DC/DC switching regulator has a semiconductor switch coupled to an inductor, a first capacitor and a rectifier. A circuit to improve the switching efficiency of the semiconductor switch has a transmission gate coupled between the gate of the semiconductor switch and a second capacitor. The transmission gate is turned ON only when the gate of the semiconductor switch is about to make a positive or negative transition and isolated from the first and second voltage sources. A portion of the charge stored in the parasitic capacitance of the gate of the semiconductor switch can be stored in the second capacitor and reused to partially drive the semiconductor switch from the second to the first ON/OFF state. A further embodiment employs this technique with a synchronous rectifier in the regulator circuit.