Patents by Inventor David D. Meng

David D. Meng 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).

  • Charge pump mode transition control
    Patent number: 6512411
    Abstract: A mode transitioning system (10) for a charge pump (12), which may optionally be embodied in an integrated circuit (28). A number of switches (30a-i) are operated based on an input detection sub-circuit (32) and an output detection sub-circuit (34) to controllably connect a number of flying capacitors (24, 26) in a variety of manners producing alternate input voltage to output voltage step ratios. One example embodiment of the mode transitioning system (10) proceeds from an idle state (52a), through start-up and fault testing states (52b-c), and then selects among alternate step-down ratios of 1:1, 2:3, and 1:2 based on suitability and efficiency for respective operating states (52d-f).
    Type: Grant
    Filed: March 11, 2002
    Date of Patent: January 28, 2003
    Assignee: Maxim Integrated Products, Inc.
    Inventors: David D. Meng, Charles R. Thurber, Jr.
  • CHARGE PUMP MODE TRANSITION CONTROL
    Publication number: 20020130705
    Abstract: A mode transitioning system (10) for a charge pump (12), which may optionally be embodied in an integrated circuit (28). A number of switches (30a-i) are operated based on an input detection sub-circuit (32) and an output detection sub-circuit (34) to controllably connect a number of flying capacitors (24, 26) in a variety of manners producing alternate input voltage to output voltage step ratios. One example embodiment of the mode transitioning system (10) is presented which proceeds from an idle state (52a), through start-up and fault testing states (52b-c), and then selects among alternate step-down rations of 1:1, 2:3, and 1:2 based on suitability and efficiency for respective operating states (52d-f).
    Type: Application
    Filed: March 11, 2002
    Publication date: September 19, 2002
    Inventors: David D. Meng, Charles R. Thurber
  • Charge pump transition control between step up and step down operation
    Publication number: 20020109540
    Abstract: A method (10) and circuit (40) for transition control between step up and step down modes in a charge pump (12). The charge pump (12) starts in an off state (14) and a determination (16) is made if the input voltage is less than or equal to the output voltage. If so, the charge pump (12) is operated (18) in step up mode until it is within regulation. Otherwise, the charge pump (12) is operated (24) in step down mode for at least one cycle. If this brings the charge pump (12) within regulation it is shut down. Otherwise, the charge pump (12) is operated (18) in step up mode until it is within regulation.
    Type: Application
    Filed: October 23, 2001
    Publication date: August 15, 2002
    Inventor: David D. Meng