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:
May. 05, 2009
Filed:
Apr. 09, 2007
Kenichi Nakata, Kyoto, JP;
Kenichi Nakata, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A step-up DC/DC converter uses N-channel field-effect transistors as both an output transistor and a synchronous-rectification transistor and includes a first driver making the gate voltage of the output transistor pulsate between a ground voltage and an input voltage and a second driver making the gate voltage of the synchronous-rectification transistor pulsate between a switching voltage and a bootstrap voltage equal to the switching voltage plus at least the ON threshold voltage of the synchronous-rectification transistor. With this configuration, the converter operates with improved power efficiency and performs synchronous rectification unhindered even with a small input-output voltage difference.