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. 28, 2013
Filed:
May. 28, 2010
Takashi Imura, Chiba, JP;
Takao Nakashimo, Chiba, JP;
Masakazu Sugiura, Chiba, JP;
Atsushi Igarashi, Chiba, JP;
Masahiro Mitani, Chiba, JP;
Takashi Imura, Chiba, JP;
Takao Nakashimo, Chiba, JP;
Masakazu Sugiura, Chiba, JP;
Atsushi Igarashi, Chiba, JP;
Masahiro Mitani, Chiba, JP;
Seiko Instruments Inc., Chiba, JP;
Abstract
Provided is a power supply integrated circuit including an overheat protection circuit with high detection accuracy. The overheat protection circuit includes: a current generation circuit including: a first metal oxide semiconductor (MOS) transistor including a gate terminal and a drain terminal that are connected to each other, the first MOS transistor operating in a weak inversion region; a second MOS transistor including a gate terminal connected to the gate terminal of the first MOS transistor, the second MOS transistor having the same conductivity type as the first MOS transistor and operating in a weak inversion region; and a first resistive element connected to a source terminal of the second MOS transistor; and a comparator for comparing a reference voltage having positive temperature characteristics and a temperature voltage having negative temperature characteristics, which are obtained based on a current generated by the current generation circuit.