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).
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Patent number: 8629566Abstract: 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: GrantFiled: September 26, 2005Date of Patent: January 14, 2014Assignee: International Rectifier CorporationInventors: Bharat Shivkumar, Chuan Cheah
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Publication number: 20060022333Abstract: 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: ApplicationFiled: September 26, 2005Publication date: February 2, 2006Inventors: Bharat Shivkumar, Chuan Cheah
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Patent number: 6984890Abstract: 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: GrantFiled: July 2, 2004Date of Patent: January 10, 2006Assignee: International Rectifier CorporationInventors: Bharat Shivkumar, Daniel M. Kinzer, Jorge Munoz
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Patent number: 6949822Abstract: 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: GrantFiled: March 19, 2001Date of Patent: September 27, 2005Assignee: International Rectifier CorporationInventors: Bharat Shivkumar, Chuan Cheah
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Publication number: 20040238971Abstract: 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: ApplicationFiled: July 2, 2004Publication date: December 2, 2004Applicant: International Rectifier CorporationInventors: Bharat Shivkumar, Daniel M. Kinzer, Jorge Munoz
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Patent number: 6776399Abstract: 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: GrantFiled: May 20, 2002Date of Patent: August 17, 2004Assignee: International Rectifier CorporationInventors: Bharat Shivkumar, Daniel M. Kinzer, Jorge Munoz
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Patent number: 6765292Abstract: 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: GrantFiled: December 10, 2002Date of Patent: July 20, 2004Assignee: International Rectifier CorporationInventors: Chuan Cheah, Bharat Shivkumar
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Publication number: 20030107130Abstract: 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: ApplicationFiled: December 10, 2002Publication date: June 12, 2003Applicant: International Rectifier CorporationInventors: Chuan Cheah, Bharat Shivkumar
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Publication number: 20020135079Abstract: 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: ApplicationFiled: May 20, 2002Publication date: September 26, 2002Applicant: International Rectifier CorporationInventors: Bharat Shivkumar, Daniel M. Kinzer, Jorge Munoz
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Patent number: 6410989Abstract: 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: GrantFiled: January 4, 1999Date of Patent: June 25, 2002Assignee: International Rectifier CorporationInventors: Bharat Shivkumar, Daniel M. Kinzer, Jorge Munoz
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Publication number: 20010050441Abstract: 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: ApplicationFiled: March 19, 2001Publication date: December 13, 2001Applicant: International Rectifier Corp.Inventors: Bharat Shivkumar, Chuan Cheah