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:
Dec. 25, 2007
Filed:
Oct. 18, 2005
Taku Kobayashi, Kyoto, JP;
Keiichi Fujii, Kusatsu, JP;
Yasunobu Kakumoto, Kyoto, JP;
Toshinobu Nagasawa, Osaka, JP;
Taku Kobayashi, Kyoto, JP;
Keiichi Fujii, Kusatsu, JP;
Yasunobu Kakumoto, Kyoto, JP;
Toshinobu Nagasawa, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A step-down voltage output circuit preventing: latch-up phenomenon in a load circuit for a period between a power-supply activation and complete start of a charge pump circuit; and rapid change of a substrate potential when a step-down voltage output is changed from ON to OFF. The step-down voltage output circuit has a timer circuit that operates depending on control signals and a timer period; a first N-channel MOS transistor in which a source is connected to a step-down voltage output terminal, a drain is connected to ground, a gate is connected to a power-supply voltage input terminal through a resistance; and a second N-channel MOS transistor in which a source is connected to the step-down voltage output terminal, a drain is connected to the gate of the first N-channel MOS transistor, and a gate is connected to an output terminal of the timer circuit.