Patents by Inventor Katsuyuki Yasukouti

Katsuyuki Yasukouti has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Controller for DC-DC converter and method for controlling DC-DC converter
    Patent number: 7609042
    Abstract: A DC-DC converter that suppresses increase in area and obtains high conversion efficiency irrespective of the output current. A controller controls a first output transistor and a second output transistor in a PWM operation mode or a linear operation mode based on output voltage of the DC-DC converter. The controller operates the DC-DC converter as a switching regulator that activates and inactivates the first output transistor and the second output transistor in a complementary manner during the PWM operation mode. The controller operates the DC-DC converter as a linear regulator that inactivates the second output transistor and controls the ON-resistance value of the first output transistor to perform linear operation with the first output transistor during the linear operation mode.
    Type: Grant
    Filed: March 28, 2006
    Date of Patent: October 27, 2009
    Assignee: Fujitsu Microelectronics Limited
    Inventors: Masatoshi Kokubun, Katsuyuki Yasukouti, Takashi Matsumoto
  • Controller for DC-DC converter and method for controlling DC-DC converter
    Publication number: 20070069703
    Abstract: A DC-DC converter that suppresses increase in area and obtains high conversion efficiency irrespective of the output current. A controller controls a first output transistor and a second output transistor in a PWM operation mode or a linear operation mode based on output voltage of the DC-DC converter. The controller operates the DC-DC converter as a switching regulator that activates and inactivates the first output transistor and the second output transistor in a complementary manner during the PWM operation mode. The controller operates the DC-DC converter as a linear regulator that inactivates the second output transistor and controls the ON-resistance value of the first output transistor to perform linear operation with the first output transistor during the linear operation mode.
    Type: Application
    Filed: March 28, 2006
    Publication date: March 29, 2007
    Inventors: Masatoshi Kokubun, Katsuyuki Yasukouti, Takashi Matsumoto