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:
Jan. 06, 2009
Filed:
Jul. 12, 2006
Satoshi Azuhata, Osaka, JP;
Toshinobu Nagasawa, Osaka, JP;
Tetsushi Toyooka, Kyoto, JP;
Keiichi Fujii, Shiga, JP;
Satoshi Azuhata, Osaka, JP;
Toshinobu Nagasawa, Osaka, JP;
Tetsushi Toyooka, Kyoto, JP;
Keiichi Fujii, Shiga, JP;
Panasonic Corporation, Osaka, JP;
Abstract
While a charge pump activation/deactivation control circuit is outputting a high level signal, MOS transistors for short-circuiting a flying capacitor are off, and the charge pump circuit operates normally. When the charge pump activation/deactivation control circuit outputs a low level signal, the MOS transistors for short-circuiting the flying capacitor are turned on, and the charge pump circuit is deactivated. Consequently, the voltages at the terminals of the flying capacitor are the same and the charge charged therein is discharged. Therefore, when the charge pump circuit is activated again, the initial amount of charge charged to the flying capacitor is zero. Consequently, no large current flows through an output capacitor in the first discharging cycle after the re-activation.