Patents by Inventor Bharat Shivkumar

Bharat Shivkumar 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).

  • Patent number: 8629566
    Abstract: A multichip module has a substrate, which receives several flip chip and for other semiconductor die on one surface and has vias extending through the substrate from the flip chip bottom electrodes to solder ball electrodes on the bottom of the substrate. Passive components are also mounted on the top of the substrate and are connected to further vias which extend to respective ball contacts at the substrate bottom. In one embodiment, the bottom surfaces and electrodes of the die are insulated and their tops (and drain electrodes) are connected by a moldable conductive layer. In another embodiment the top surface of the substrate is covered by an insulation cap, which may be finned for improved thermal properties. The passives are upended to have their longest dimension perpendicular to the substrate surface and are between the fin valleys.
    Type: Grant
    Filed: September 26, 2005
    Date of Patent: January 14, 2014
    Assignee: International Rectifier Corporation
    Inventors: Bharat Shivkumar, Chuan Cheah
  • Publication number: 20060022333
    Abstract: A multichip module has a substrate, which receives several flip chip and for other semiconductor die on one surface and has vias extending through the substrate from the flip chip bottom electrodes to solder ball electrodes on the bottom of the substrate. Passive components are also mounted on the top of the substrate and are connected to further vias which extend to respective ball contacts at the substrate bottom. In one embodiment, the bottom surfaces and electrodes of the die are insulated and their tops (and drain electrodes) are connected by a moldable conductive layer. In another embodiment the top surface of the substrate is covered by an insulation cap, which may be finned for improved thermal properties. The passives are upended to have their longest dimension perpendicular to the substrate surface and are between the fin valleys.
    Type: Application
    Filed: September 26, 2005
    Publication date: February 2, 2006
    Inventors: Bharat Shivkumar, Chuan Cheah
  • Patent number: 6984890
    Abstract: A substrate having upper and lower surfaces, the upper surface including a periphery defined by first and second spaced apart side edges and front and rear spaced apart edges; a power semiconductor die disposed on the upper surface of the substrate, the die including a top surface on which at least a first metalized surface is disposed and a bottom surface; a plurality of conductive pads disposed only at the second side edge of the substrate; and a plurality of wire bonds extending from the first metalized surface to the plurality of conductive pads.
    Type: Grant
    Filed: July 2, 2004
    Date of Patent: January 10, 2006
    Assignee: International Rectifier Corporation
    Inventors: Bharat Shivkumar, Daniel M. Kinzer, Jorge Munoz
  • Patent number: 6949822
    Abstract: A multichip module has a substrate, which receives several flip chip and for other semiconductor die on one surface and has vias extending through the substrate from the flip chip bottom electrodes to solder ball electrodes on the bottom of the substrate. Passive components are also mounted on the top of the substrate and are connected to further vias which extend to respective ball contacts at the substrate bottom. In one embodiment, the bottom surfaces and electrodes of the die are insulated and their tops (and drain electrodes) are connected by a moldable conductive layer. In another embodiment the top surface of the substrate is covered by an insulation cap, which may be finned for improved thermal properties. The passives are upended to have their longest dimension perpendicular to the substrate surface and are between the fin valleys.
    Type: Grant
    Filed: March 19, 2001
    Date of Patent: September 27, 2005
    Assignee: International Rectifier Corporation
    Inventors: Bharat Shivkumar, Chuan Cheah
  • Publication number: 20040238971
    Abstract: A substrate having upper and lower surfaces, the upper surface including a periphery defined by first and second spaced apart side edges and front and rear spaced apart edges; a power semiconductor die disposed on the upper surface of the substrate, the die including a top surface on which at least a first metalized surface is disposed and a bottom surface; a plurality of conductive pads disposed only at the second side edge of the substrate; and a plurality of wire bonds extending from the first metalized surface to the plurality of conductive pads.
    Type: Application
    Filed: July 2, 2004
    Publication date: December 2, 2004
    Applicant: International Rectifier Corporation
    Inventors: Bharat Shivkumar, Daniel M. Kinzer, Jorge Munoz
  • Patent number: 6776399
    Abstract: A substrate having upper and lower surfaces, the upper surface including a periphery defined by first and second spaced apart side edges and front and rear spaced apart edges; a power semiconductor die disposed on the upper surface of the substrate, the die including a top surface on which at least a first metalized surface is disposed and a bottom surface; a plurality of conductive pads disposed only at the second side edge of the substrate; and a plurality of wire bonds extending from the first metalized surface to the plurality of conductive pads.
    Type: Grant
    Filed: May 20, 2002
    Date of Patent: August 17, 2004
    Assignee: International Rectifier Corporation
    Inventors: Bharat Shivkumar, Daniel M. Kinzer, Jorge Munoz
  • Patent number: 6765292
    Abstract: A power semiconductor package, comprising: a power MOSFET die having a bottom surface with a bottom electrode disposed for contacting a conductor on a support board, and having a top surface with a top electrode; a bump strap which bridges over the power MOSFET die, having mounting portions disposed respectively on opposite sides of the power MOSFET die and disposed for mounting on the support board, and a central portion which engages and is conductively connected to the top electrode of the power MOSFET die. The bottom electrode comprises at least one of a drain electrode and a gate electrode, and the top electrode comprises a source electrode. The bump strap extends upward from the mounting portions to define a respective pair of upper portions of the bump strap which are disposed above the power MOSFET die, the central portion of the bump strap being disposed lower than the upper portions so as to be adjacent to the top electrode of the power MOSFET die.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: July 20, 2004
    Assignee: International Rectifier Corporation
    Inventors: Chuan Cheah, Bharat Shivkumar
  • Publication number: 20030107130
    Abstract: A power semiconductor package, comprising: a power MOSFET die having a bottom surface with a bottom electrode disposed for contacting a conductor on a support board, and having a top surface with a top electrode; a bump strap which bridges over the power MOSFET die, having mounting portions disposed respectively on opposite sides of the power MOSFET die and disposed for mounting on the support board, and a central portion which engages and is conductively connected to the top electrode of the power MOSFET die. The bottom electrode comprises at least one of a drain electrode and a gate electrode, and the top electrode comprises a source electrode. The bump strap extends upward from the mounting portions to define a respective pair of upper portions of the bump strap which are disposed above the power MOSFET die, the central portion of the bump strap being disposed lower than the upper portions so as to be adjacent to the top electrode of the power MOSFET die.
    Type: Application
    Filed: December 10, 2002
    Publication date: June 12, 2003
    Applicant: International Rectifier Corporation
    Inventors: Chuan Cheah, Bharat Shivkumar
  • Publication number: 20020135079
    Abstract: A substrate having upper and lower surfaces, the upper surface including a periphery defined by first and second spaced apart side edges and front and rear spaced apart edges; a power semiconductor die disposed on the upper surface of the substrate, the die including a top surface on which at least a first metalized surface is disposed and a bottom surface; a plurality of conductive pads disposed only at the second side edge of the substrate; and a plurality of wire bonds extending from the first metalized surface to the plurality of conductive pads.
    Type: Application
    Filed: May 20, 2002
    Publication date: September 26, 2002
    Applicant: International Rectifier Corporation
    Inventors: Bharat Shivkumar, Daniel M. Kinzer, Jorge Munoz
  • Patent number: 6410989
    Abstract: A substrate having upper and lower surfaces, the upper surface including a periphery defined by first and second spaced apart side edges and front and rear spaced apart edges; a power semiconductor die disposed on the upper surface of the substrate, the die including a top surface on which at least a first metalized surface is disposed and a bottom surface; a plurality of conductive pads disposed only at the second side edge of the substrate; and a plurality of wire bonds extending from the first metalized surface to the plurality of conductive pads.
    Type: Grant
    Filed: January 4, 1999
    Date of Patent: June 25, 2002
    Assignee: International Rectifier Corporation
    Inventors: Bharat Shivkumar, Daniel M. Kinzer, Jorge Munoz
  • Publication number: 20010050441
    Abstract: A multichip module has a substrate, which receives several flip chip and for other semiconductor die on one surface and has vias extending through the substrate from the flip chip bottom electrodes to solder ball electrodes on the bottom of the substrate. Passive components are also mounted on the top of the substrate and are connected to further vias which extend to respective ball contacts at the substrate bottom. In one embodiment, the bottom surfaces and electrodes of the die are insulated and their tops (and drain electrodes) are connected by a moldable conductive layer. In another embodiment the top surface of the substrate is covered by an insulation cap, which may be finned for improved thermal properties. The passives are upended to have their longest dimension perpendicular to the substrate surface and are between the fin valleys.
    Type: Application
    Filed: March 19, 2001
    Publication date: December 13, 2001
    Applicant: International Rectifier Corp.
    Inventors: Bharat Shivkumar, Chuan Cheah