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:
Jun. 15, 2010
Filed:
Aug. 30, 2007
Applicants:
Atsushi Kanamori, Nara, JP;
Hirohisa Warita, Nara, JP;
Tadamasa Kimura, Tenri, JP;
Inventors:
Assignee:
Sharp Kabushiki Kaisha, Osaka-Shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M 7/537 (2006.01);
U.S. Cl.
CPC ...
Abstract
A bootstrap circuit for a step-down chopper regulator IC includes an LDMOS transistor having a gate and a source connected to output terminals of a constant voltage circuit and a drain connected to a leader terminal of a boot voltage, and a bootstrap control circuit that performs control of turning on and off the LDMOS transistor so as to support high-speed oscillation without requiring expensive process and realize a stable step-down chopping action with a wide input voltage range.