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. 28, 2006
Filed:
Sep. 24, 2004
Steve Martinez, Tucson, AZ (US);
Steve Martinez, Tucson, AZ (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A switching buck regulator circuit includes an n-type high-side switch. The driver of the high-side switch employs a boot voltage (Vcboot) as a power supply. Also, the output current is mirrored to a sense branch. A current sense voltage is generated employing a transistor in the sense branch. The current sense voltage is compared to a reference voltage that is generated employing another transistor having a gate that is coupled to the gate of the sense branch transistor. A diode (Dp) is coupled between the gate of the sense branch transistor and the input voltage (Vin). Another diode (Dc) is coupled between the gate of the sense branch transistor and Vcboot. When the high-side switch is off, the current sense voltage is clamped to substantially Vin−V−V. When the high-side switch is on, the gate voltage of the high-side switch is substantially given by Vcboot−V.