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:
Mar. 31, 2009
Filed:
Oct. 18, 2007
Takashi Tahata, Kanagawa, JP;
Takashi Tahata, Kanagawa, JP;
NEC Electronics Corporation, Kawasaki, Kanagawa, JP;
Abstract
A voltage-booster power supply circuit comprises a semiconductor IC and an external circuitry. The semiconductor IC has: first and second charge pump circuits each of which boosts a voltage by using a capacitor in response to a control signal; and a selection circuit. In a first mode, the selection circuit outputs out-of-phase first and second control signals as the control signal to the first and second charge pump circuits, respectively. The external circuitry is provided with first and second pumping capacitors that are connected as the above-mentioned capacitor to the first and second charge pump circuits, respectively. While in a second mode, the selection circuit outputs an in-phase control signal as the control signal to the first and second charge pump circuits. The external circuitry is provided with a common pumping capacitor that is connected as the above-mentioned capacitor to the first and second charge pump circuits in common.