Power device having reduced thickness

• US 9,786,516 B2
• Filed: 11/20/2015
• Issued: 10/10/2017
• Est. Priority Date: 06/30/2011
• Status: Active Grant

• Current Assignee: STMicroelectronics SRL (STMicroelectronics NV)
• Original Assignee: STMicroelectronics SRL (STMicroelectronics NV)
• Inventors: Minotti, Agatino, Stella, Cristiano Gianluca
• Primary Examiner(s): Fan, Bo
• Application Number:
  US14/946,871
• Publication Number:
  US 20160079092A1
• Time in Patent Office: 690 Days
• Field of Search: 438122, 257712
• CPC Class Codes: H01L 21/52 Mounting semiconductor bodies in containers
• CPC Class Codes: H01L 21/56 Encapsulations, e.g. encapsulation layers, coatings
• CPC Class Codes: H01L 2224/32245 the item being metallic
• CPC Class Codes: H01L 23/3107 the device being completely enclosed
• CPC Class Codes: H01L 23/3114 the device being a chip scale package, e.g. CSP
• CPC Class Codes: H01L 23/3675 characterised by the shape of the housing
• CPC Class Codes: H01L 23/4334 Auxiliary members in encapsulations H01L23/49568 takes precedence
• CPC Class Codes: H01L 23/49524 the additional leads being a tape carrier or flat leads
• CPC Class Codes: H01L 23/49562 for devices being provided for in H01L29/00
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/1301 Thyristor
• CPC Class Codes: H01L 2924/13055 Insulated gate bipolar transistor [IGBT]
• CPC Class Codes: H01L 2924/13062 Junction field-effect transistor [JFET]
• CPC Class Codes: H01L 2924/13091 Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]

Abstract

An electronic device includes at least one chip and an insulating body embedding the chip. The electronic device further includes a heat-sink in contact with the chip. The heat-sink includes a plate having a first thickness. A recess is provided in the plate that defines a central portion of the plate having a second thickness less than the first thickness. The chip is mounted to the central region of the heat-sink within the recess. The insulating body includes a surface, such as a mounting surface, including an opening exposing at least a portion of the heat-sink. The device may further include a reophore extending through a side surface of the insulating body, that reophore being in contact with the heat sink.

Claims

1. A method for making an electronic device that includes an electronic component integrated within a chip, the chip comprising a first conduction terminal on a first surface of the chip, and a second conduction terminal and a third conduction terminal on a second surface of the chip opposite said first surface, comprising:

forming a first recess in a first heat sink, said first recess peripherally surrounded by a side wall defining a first recess depth and having a first mounting surface at a bottom of the first recess having a mounting area;

attaching the first surface of the chip to the first mounting surface of the first heat sink;

forming a second recess in a second heat sink;

contacting the second heat sink to the second conduction terminal, the second recess of the second heat sink extending over at least one portion of the third conduction terminal for insulating the third conduction terminal from the second heat sink; and

encapsulating the chip, the first heat sink and the second heat sink within an insulating body providing a mounting surface supporting mounting to a board.

2. The method of claim 1, wherein the mounting area exceeds a surface area of the first surface of the chip.

3. The method of claim 1, further comprising:

providing a first external terminal exposed from the insulating body and connected to said second heat sink; and

providing a second external terminal exposed from the insulating body and connected to the third conduction terminal.

4. The method of claim 3, wherein the first and second external terminals extend away from a side of the insulating body.

5. The method of claim 1, further comprising providing an external terminal exposed from the insulating body and connected to said first heat sink.

6. The method of claim 1, wherein forming the first recess comprises forming the first recess with a depth that is less than a thickness of the chip.

7. The method of claim 1, wherein attaching the first surface of the chip to the first mounting surface of the first heat sink further comprises positioning the chip within the first recess so that peripheral edges of the chip are offset from the side wall.

8. A method for making an electronic device, comprising:

providing an electronic component integrated within at least one chip, the at least one chip comprising a first conduction terminal on a first surface of the chip, and a second conduction terminal and a third conduction terminal on a second surface of the chip opposite said first surface,

embedding said at least one chip within an insulating body, the insulating body having a mounting surface configured to mount on a board,

providing a first heat-sink in contact with the first conduction terminal of said at least one chip for dissipating the heat generated by said at least one electronic component towards the mounting surface, the first heat-sink including a plate having a first thickness, the plate further provided with a first recess that defines a portion of the plate with a second thickness lower than the first thickness,

providing a second heat-sink for dissipating the heat generated by said at least one electronic component towards a free surface of the insulating body opposite the mounting surface, the second heat-sink comprising a second recess,

housing said at least one chip within said first recess, and

contacting the second heat-sink to the second conduction terminal, the second recess of the second heat-sink extending over at least one portion of the third conduction terminal for insulating the third conduction terminal from the second heat-sink.

9. The method of claim 8, further comprising encapsulating the first heat sink, second heat sink and chip within said insulating body.

10. A method for making an electronic device that includes an electronic component integrated within at least one chip, the at least one chip comprising a first conduction terminal on a first surface of the chip, and a second conduction terminal and a third conduction terminal on a second surface of the chip opposite said first surface, the method comprising:

providing a first heat-sink including a first plate having a first thickness, the first plate further provided with a first recess that defines a portion of the first plate with a second thickness lower than the first thickness,

housing said at least one chip within said first recess of the first heat sink in contact with the first conduction terminal of said at least one chip for dissipating heat away from said at least one electronic component,

providing a second heat-sink having a second plate, the second plate further provided with a second recess,

mounting the second heat-sink in contact with the second conduction terminal of said at least one chip for dissipating heat away from said at least one electronic component, the second recess of the second heat-sink further positioned to extend over at least one portion of the third conduction terminal for insulating the third conduction terminal from the second heat-sink; and

embedding said at least one chip within an insulating body supporting mounting of the electronic device to a board.

11. The method of claim 10, wherein embedding further comprises embedding the first and second heat-sinks within the insulating body.

12. The method of claim 11, wherein embedding further comprises leaving a portion of the first heat-sink and a portion of the second heatsink exposed from the insulating body to provided first and second electrical contacts for the electronic device.