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:
May. 04, 2010
Filed:
Apr. 09, 2007
Applicants:
Tawen Mei, Mountain View, CA (US);
Chunping Song, Santa Clara, CA (US);
Inventors:
Tawen Mei, Mountain View, CA (US);
Chunping Song, Santa Clara, CA (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H 3/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
A system and method are disclosed for providing a process, temperature and over-drive invariant over-current protection circuit. The over-current protection circuit comprises a power transistor, a sense transistor, at least one current sense transistor and at least one current reference transistor. The over-current protection circuit provides a current limit trip value that remains substantially constant over temperature variations, and over-drive voltage variations, and process variations.