Patents by Inventor Thomas T. Chiang

Thomas T. Chiang 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).

  • Constant-peak-current minimum-off-time pulse frequency modulator for switching regulators
    Patent number: 7439720
    Abstract: Methods and apparatus are disclosed for controlling switching regulators to automatically switch from a traditional pulse-width modulation (PWM) mode, when the load current is higher than a predetermined value, to a pulse-frequency modulation (PFM) mode, when the load current drops to a point lower than the predetermine value. Switching modes increases the efficiency of the regulator when the load current is low without provoking a large output voltage transient. In some embodiments, a single switching cycle regulates the output in the PFM mode, which reduces the switching losses and enhances the efficiency of the regulator.
    Type: Grant
    Filed: August 25, 2006
    Date of Patent: October 21, 2008
    Assignee: Monolithic Power Systems
    Inventors: James H. Nguyen, Thomas T. Chiang, Christopher T. Falvey
  • Constant-peak-current minimum-off-time pulse frequency modulator for switching regulators
    Patent number: 7116089
    Abstract: Methods and apparatus are disclosed for controlling switching regulators to automatically switch from a traditional pulse-width modulation (PWM) mode, when the load current is higher than a predetermined value, to a pulse-frequency modulation (PFM) mode, when the load current drops to a point lower than the predetermine value. Switching modes increases the efficiency of the regulator when the load current is low without provoking a large output voltage transient. In some embodiments, a single switching cycle regulates the output in the PFM mode, which reduces the switching losses and enhances the efficiency of the regulator.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: October 3, 2006
    Assignee: Monolithic Power Systems, Inc.
    Inventors: James H. Nguyen, Thomas T. Chiang, Christopher T. Falvey