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:
Aug. 29, 2006
Filed:
Nov. 08, 2002
Ronald Neal Dow, San Jose, CA (US);
Ronald Neal Dow, San Jose, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A thermal shutdown circuit board integrated circuit device. The thermal shutdown circuit includes a current source for receiving a current bias and generating an output current in accordance therewith. The current source is configured to produce the output current in a manner proportional to absolute temperature. A current mirror is coupled to the current source. The current mirror is configured to mirror the output current from the current source and is configured to have a high output impedance. A thermal shutdown transistor is coupled to control one output of the current mirror. The thermal shutdown transistor is also coupled to receive the output current and shutdown the output current at a temperature threshold in a manner dependent on shutdown circuit operating temperature.