Patents by Inventor Leeshawn Luo
Leeshawn Luo 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: 9337132Abstract: A power device package for containing, protecting and providing electrical contacts for a power transistor includes a top and bottom lead frames for directly no-bump attaching to the power transistor. The power transistor is attached to the bottom lead frame as a flip-chip with a source contact and a gate contact directly no-bumping attaching to the bottom lead frame. The power transistor has a bottom drain contact attaching to the top lead frame. The top lead frame further includes an extension for providing a bottom drain electrode substantially on a same side with the bottom lead frame. In a preferred embodiment, the power device package further includes a joint layer between device metal of source, gate or drain and top or bottom lead frame, through applying ultrasonic energy.Type: GrantFiled: October 12, 2013Date of Patent: May 10, 2016Assignee: Alpha and Omega Semiconductor IncorporatedInventors: Ming Sun, Kai Liu, Xiaotian Zhang, Yueh Se Ho, Leeshawn Luo
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Publication number: 20150102425Abstract: A power device package for containing, protecting and providing electrical contacts for a power transistor includes a top and bottom lead frames for directly no-bump attaching to the power transistor. The power transistor is attached to the bottom lead frame as a flip-chip with a source contact and a gate contact directly no-bumping attaching to the bottom lead frame. The power transistor has a bottom drain contact attaching to the top lead frame. The top lead frame further includes an extension for providing a bottom drain electrode substantially on a same side with the bottom lead frame. In a preferred embodiment, the power device package further includes a joint layer between device metal of source, gate or drain and top or bottom lead frame, through applying ultrasonic energy.Type: ApplicationFiled: October 12, 2013Publication date: April 16, 2015Inventors: Ming Sun, Kai Liu, Xiao Tian Zhang, Yueh Se Ho, Leeshawn Luo
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Patent number: 8564049Abstract: This invention discloses a power device package for containing, protecting and providing electrical contacts for a power transistor. The power device package includes a top and bottom lead frames for directly no-bump attaching to the power transistor. The power transistor is attached to the bottom lead frame as a flip-chip with a source contact and a gate contact directly no-bumping attaching to the bottom lead frame. The power transistor has a bottom drain contact attaching to the top lead frame. The top lead frame further includes an extension for providing a bottom drain electrode substantially on a same side with the bottom lead frame. In a preferred embodiment, the power device package further includes a joint layer between device metal of source, gate or drain and top or bottom lead frame, through applying ultrasonic energy.Type: GrantFiled: March 31, 2008Date of Patent: October 22, 2013Assignee: Alpha & Omega Semiconductor IncorporatedInventors: Ming Sun, Kai Liu, Xiao Tian Zhang, Yueh Se Ho, Leeshawn Luo
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Patent number: 8169062Abstract: A semiconductor integrated circuit package having a leadframe (108) that includes a leadframe pad (103a) disposed under a die (100) and a bonding metal area (101a) that is disposed over at least two adjacent sides of the die. The increase in the bonding metal area (101a) increases the number of interconnections between the metal area (101a) and the die (100) to reduce the electric resistance and inductance. Furthermore, the surface area of the external terminals radiating from the package's plastic body (106) is increased if not maximized so that heat can be dissipated quicker and external terminal resistances reduced. The integrated circuit is applicable for MOSFET devices and the bonding metal area (101a) is used for the source terminal (101). The bonding metal area may have a “L” shape, a “C” shape, a “J” shape, an “I” shape or any combination thereof.Type: GrantFiled: May 24, 2011Date of Patent: May 1, 2012Assignee: Alpha and Omega Semiconductor IncorporatedInventors: Leeshawn Luo, Anup Bhalla, Yueh-Se Ho, Sik K. Lui, Mike Chang
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Patent number: 8067822Abstract: A semiconductor integrated circuit package having a leadframe (108) that includes a leadframe pad (103a) disposed under a die (100) and a bonding metal area (101a) that is disposed over at least two adjacent sides of the die. The increase in the bonding metal area (101a) increases the number of interconnections between the metal area (101a) and the die (100) to reduce the electric resistance and inductance. Furthermore, the surface area of the external terminals radiating from the package's plastic body (106) is increased if not maximized so that heat can be dissipated quicker and external terminal resistances reduced. The integrated circuit is applicable for MOSFET devices and the bonding metal area (101a) is used for the source terminal (101). The bonding metal area may have a “L” shape, a “C” shape, a “J” shape, an “I” shape or any combination thereof.Type: GrantFiled: June 23, 2008Date of Patent: November 29, 2011Assignee: Alpha and Omega Semiconductor IncorporatedInventors: Leeshawn Luo, Anup Bhalla, Yueh-Se Ho, Sik K. Lui, Mike Chang
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Publication number: 20110221005Abstract: A semiconductor integrated circuit package having a leadframe (108) that includes a leadframe pad (103a) disposed under a die (100) and a bonding metal area (101a) that is disposed over at least two adjacent sides of the die. The increase in the s bonding metal area (101a) increases the number of interconnections between the metal area (101a) and the die (100) to reduce the electric resistance and inductance. Furthermore, the surface area of the external terminals radiating from the package's plastic body (106) is increased if not maximized so that heat can be dissipated quicker and external terminal, resistances reduced. The integrated circuit is applicable for MOSFET devices and the bonding metal area (101a) is used for the source terminal (101). The bonding metal area may have a “L” shape, a “C” shape, a “J” shape, an “I” shape or any combination thereof.Type: ApplicationFiled: May 24, 2011Publication date: September 15, 2011Inventors: Leeshawn Luo, Anup Bhalla, Yueh-Se Ho, Sik K. Lui, Mike Chang
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Patent number: 7951651Abstract: A DFN semiconductor package includes a leadframe having a die bonding pad formed integrally with a drain lead, a gate lead and a source lead, a die coupled to the die bonding pad, a die source bonding area coupled to the source lead and a die gate bonding area coupled to the gate lead, and an encapsulant at least partially covering the die, drain lead, gate lead and source lead.Type: GrantFiled: May 28, 2009Date of Patent: May 31, 2011Assignee: Alpha and Omega Semiconductor IncorporatedInventors: Kai Liu, Xiaotian Zhang, Ming Sun, Leeshawn Luo
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Patent number: 7897438Abstract: A semiconductor package and method for making a semiconductor package are disclosed. The semiconductor package has a top surface and a mounting surface and includes a die, a conducting connecting material, a plating material and an insulating material. The die has a processed surface facing towards the mounting surface of the semiconductor package. Exposed metal connections are at the processed surface of the die. The conducting connecting material is disposed on the exposed metal connections. The plating material is in contact with the conducting connecting material. The insulating material is formed around the conducting connecting material, and the plating material extends to the exterior of the insulating material.Type: GrantFiled: May 22, 2008Date of Patent: March 1, 2011Assignee: Alpha and Omega Semiconductor IncorporatedInventors: Leeshawn Luo, Kai Liu, Ming Sun, Xiao Tian Zhang
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Patent number: 7633140Abstract: A semiconductor package includes a lead frame having a plurality of leads and a lead frame pad, the lead frame pad including a die coupled thereto, at least one of the plurality of leads having an external portion sloped upwards relative to a bottom surface of the package, metal connectors connecting the die to the plurality of leads, and a resin body encapsulating the die, metal connectors and at least a portion of the lead frame.Type: GrantFiled: December 9, 2003Date of Patent: December 15, 2009Assignee: Alpha and Omega Semiconductor IncorporatedInventors: Leeshawn Luo, Anup Bhalla, Sik K. Lui, Yueh-Se Ho, Mike F. Chang, Xiao Tiang Zhang
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Publication number: 20090233403Abstract: A DFN semiconductor package includes a leadframe having a die bonding pad formed integrally with a drain lead, a gate lead and a source lead, a die coupled to the die bonding pad, a die source bonding area coupled to the source lead and a die gate bonding area coupled to the gate lead, and an encapsulant at least partially covering the die, drain lead, gate lead and source lead.Type: ApplicationFiled: May 28, 2009Publication date: September 17, 2009Inventors: Kai Liu, Xiaotian Zhang, Ming Sun, Leeshawn Luo
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Publication number: 20090014853Abstract: A semiconductor integrated circuit package having a leadframe (108) that includes a leadframe pad (103a) disposed under a die (100) and a bonding metal area (101a) that is disposed over at least two adjacent sides of the die. The increase in the bonding metal area (101a) increases the number of interconnections between the metal area (101a) and the die (100) to reduce the electric resistance and inductance. Furthermore, the surface area of the external terminals radiating from the package's plastic body (106) is increased if not maximized so that heat can be dissipated quicker and external terminal resistances reduced. The integrated circuit is applicable for MOSFET devices and the bonding metal area (101a) is used for the source terminal (101). The bonding metal area may have a “L” shape, a “C” shape, a “J” shape, an “I” shape or any combination thereof.Type: ApplicationFiled: June 23, 2008Publication date: January 15, 2009Inventors: Leeshawn Luo, Anup Bhalla, Yueh-Se Ho, Sik K. Lui, Mike Chang
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Publication number: 20080233679Abstract: A semiconductor package and method for making a semiconductor package are disclosed. The semiconductor package has a top surface and a mounting surface and includes a die, a conducting connecting material, a plating material and an insulating material. The die has a processed surface facing towards the mounting surface of the semiconductor package. Exposed metal connections are at the processed surface of the die. The conducting connecting material is disposed on the exposed metal connections. The plating material is in contact with the conducting connecting material. The insulating material is formed around the conducting connecting material, and the plating material extends to the exterior of the insulating material.Type: ApplicationFiled: May 22, 2008Publication date: September 25, 2008Inventors: Leeshawn Luo, Kai Liu, Ming Sun, Xiao Tian Zhang
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Publication number: 20080211070Abstract: This invention discloses a power device package for containing, protecting and providing electrical contacts for a power transistor. The power device package includes a top and bottom lead frames for directly no-bump attaching to the power transistor. The power transistor is attached to the bottom lead frame as a flip-chip with a source contact and a gate contact directly no-bumping attaching to the bottom lead frame. The power transistor has a bottom drain contact attaching to the top lead frame. The top lead frame further includes an extension for providing a bottom drain electrode substantially on a same side with the bottom lead frame. In a preferred embodiment, the power device package further includes a joint layer between device metal of source, gate or drain and top or bottom lead frame, through applying ultrasonic energy.Type: ApplicationFiled: March 31, 2008Publication date: September 4, 2008Inventors: Ming Sun, Kai Liu, Xiao Tian Zhang, Yueh Se Ho, Leeshawn Luo
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Patent number: 7394151Abstract: A semiconductor package and method for making a semiconductor package are disclosed. The semiconductor package has a top surface and a mounting surface and includes a die, a conducting connecting material, a plating material and an insulating material. The die has a processed surface facing towards the mounting surface of the semiconductor package. Exposed metal connections are at the processed surface of the die. The conducting connecting material is disposed on the exposed metal connections. The plating material is in contact with the conducting connecting material. The insulating material is formed around the conducting connecting material, and the plating material extends to the exterior of the insulating material.Type: GrantFiled: February 15, 2005Date of Patent: July 1, 2008Assignee: Alpha & Omega Semiconductor LimitedInventors: Leeshawn Luo, Kai Liu, Ming Sun, Xiao Tian Zhang
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Patent number: 7391100Abstract: A semiconductor integrated circuit package having a leadframe (108) that includes a leadframe pad (103a) disposed under a die (100) and a bonding metal area (101a) that is disposed over at least two adjacent sides of the die. The increase in the bonding metal area (101a) increases the number of interconnections between the metal area (101a) and the die (100) to reduce the electric resistance and inductance. Furthermore, the surface area of the external terminals radiating from the package's plastic body (106) is increased if not maximized so that heat can be dissipated quicker and external terminal resistances reduced. The integrated circuit is applicable for MOSFET devices and the bonding metal area (101a) is used for the source terminal (101). The bonding metal area may have a “L” shape, a “C” shape, a “J” shape, an “I” shape or any combination thereof.Type: GrantFiled: October 25, 2004Date of Patent: June 24, 2008Assignee: Alpha & Omega Semiconductor LimitedInventors: Leeshawn Luo, Anup Bhalla, Yueh-Se Ho, Sik K. Lui, Mike Chang
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Patent number: 7208818Abstract: A semiconductor package including a relatively thick lead frame having a plurality of leads and a first lead frame pad, the first lead frame pad including a die coupled thereto, bonding wires connecting the die to the plurality of leads, the bonding wires being aluminum, and a resin body encapsulating the die, bonding wires and at least a portion of the lead frame.Type: GrantFiled: July 20, 2004Date of Patent: April 24, 2007Assignee: Alpha and Omega Semiconductor Ltd.Inventors: Leeshawn Luo, Anup Bhalla, Sik K. Lui, Yueh-Se Ho, Mike F. Chang, Xiao Tian Zhang
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Patent number: 7183616Abstract: This invention discloses a method for configuring a power MOSFET package by packaging several paralleled and separated MOSFET chips in the assembly. The method further includes a step of connecting the gate pad on each of these MOSFET chips with a low-resistance gate bus. The package resistance and inductance are significantly reduced and switching speed and heat dissipation are substantially improved.Type: GrantFiled: July 30, 2002Date of Patent: February 27, 2007Assignee: Alpha & Omega Semiconductor, Ltd.Inventors: Anup Bhalla, Sik K Lui, Leeshawn Luo, Yueh-Se Ho
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Publication number: 20060180931Abstract: A semiconductor package and method for making a semiconductor package are disclosed. The semiconductor package has a top surface and a mounting surface and includes a die, a conducting connecting material, a plating material and an insulating material. The die has a processed surface facing towards the mounting surface of the semiconductor package. Exposed metal connections are at the processed surface of the die. The conducting connecting material is disposed on the exposed metal connections. The plating material is in contact with the conducting connecting material. The insulating material is formed around the conducting connecting material, and the plating material extends to the exterior of the insulating material.Type: ApplicationFiled: February 15, 2005Publication date: August 17, 2006Inventors: Leeshawn Luo, Kai Liu, Ming Sun, Xiao Zhang
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Publication number: 20060145319Abstract: This invention discloses a power device package for containing, protecting and providing electrical contacts for a power transistor. The power device package includes a top and bottom lead frames for directly no-bump attaching to the power transistor. The power transistor is attached to the bottom lead frame as a flip-chip with a source contact and a gate contact directly no-bumping attaching to the bottom lead frame. The power transistor has a bottom drain contact attaching to the top lead frame. The top lead frame further includes an extension for providing a bottom drain electrode substantially on a same side with the bottom lead frame. In a preferred embodiment, the power device package further includes a joint layer between device metal of source, gate or drain and top or bottom lead frame, through applying ultrasonic energy.Type: ApplicationFiled: December 31, 2004Publication date: July 6, 2006Inventors: Ming Sun, Kai Liu, Xiao Zhang, Yueh Ho, Leeshawn Luo
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Publication number: 20060145312Abstract: A DFN semiconductor package includes a leadframe having a die bonding pad formed integrally with a drain lead, a gate lead and a source lead, a die coupled to the die bonding pad, a die source bonding area coupled to the source lead and a die gate bonding area coupled to the gate lead, and an encapsulant at least partially covering the die, drain lead, gate lead and source lead.Type: ApplicationFiled: January 5, 2005Publication date: July 6, 2006Inventors: Kai Liu, Xiaotian Zhang, Ming Sun, Leeshawn Luo