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:
Feb. 08, 2011
Filed:
Feb. 13, 2009
Makoto Sasaki, Kanagawa, JP;
Kentaro Tanaka, Kanagawa, JP;
Takafumi Natsume, Kanagawa, JP;
Renesas Electronics Corporation, Kawasaki-shi, Kanagawa, JP;
Abstract
Provided is a power supply circuit generating a desired voltage by voltage multiplication, and satisfying both a demand to reduce current consumption and a demand to enable operation with a low power voltage at the same time. A power supply circuit of the present invention includes: a voltage generating circuit for generating internal voltages VIand VIfrom a power supply voltage VDD; a voltage step-up/down circuit for generating voltages VOto VOeach having a different level by multiplying the internal voltages VIand VI; and a voltage comparison circuit for comparing the voltage VOwith the power supply voltage VDD. The voltage generating circuit is configured to select one of the internal voltages VIand VIaccording to an output of the voltage comparison circuit. Additionally, a voltage multiplication rate of the voltage multiplication circuit is switched according to the output of the voltage comparison circuit.