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. 07, 2010
Filed:
Aug. 05, 2008
Atsumasa Sako, Kawasaki, JP;
Atsumasa Sako, Kawasaki, JP;
Fujitsu Semiconductor Limited, Yokohama, JP;
Abstract
A disclosed invention is an internal power supply circuit, which generates an internal power supply from a first power supply. The circuit comprises a first internal step-down power supply generation unit, which generates a first internal step-down power supply from the first power supply; a normal second internal step-down power supply generation unit, which generates a second internal step-down power supply from the first internal step-down power supply in the normal operating state, and which, at the time of power supply startup, begins operation to generate the second internal step-down power supply at a first timing at which a voltage of the first internal step-down power supply reaches a prescribed reference level; and, a startup power supply load unit, which begins to consume, before the first time, current from the first internal step-down power supply.