Magnetic phase change material for heat dissipation

• US 10,643,917 B2
• Filed: 09/21/2018
• Issued: 05/05/2020
• Est. Priority Date: 09/22/2017
• Status: Active Grant

• Current Assignee: Infineon Technologies AG
• Original Assignee: Infineon Technologies AG
• Inventors: Roesner, Michael, Bergmann, Christoph
• Primary Examiner(s): Blum, David S
• Application Number:
  US16/138,697
• Publication Number:
  US 20190096780A1
• Time in Patent Office: 592 Days
• Field of Search: 257712, 438122
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/32225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 23/29 characterised by the material , e.g. carbon interlayer dielectrics H01L23/5329
• CPC Class Codes: H01L 23/295 containing a filler H01L23/296 takes precedence
• CPC Class Codes: H01L 23/3107 the device being completely enclosed
• CPC Class Codes: H01L 23/34 Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements thermal treatment apparatus H01L21/00
• CPC Class Codes: H01L 23/427 Cooling by change of state, e.g. use of heat pipes by liquefied gas H01L23/445
• CPC Class Codes: H01L 23/4334 Auxiliary members in encapsulations H01L23/49568 takes precedence
• 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: H10N 50/80 Constructional details
• CPC Class Codes: H10N 50/85 Magnetic active materials

Abstract

An electronic component includes an electronic chip and a magnetic phase change material configured to consume energy when changing between different magnetic phases in response to heating above a phase change temperature. The phase change material is thermally coupled with the electronic chip to thereby dissipate heat from the electronic chip upon heating up to or above the phase change temperature.

Claims

1. An electronic component, comprising:

an electronic chip; and

a magnetic phase change material thermally coupled with the electronic chip and configured to consume energy when changing between different magnetic phases in response to heating up to or above a phase change temperature and thereby dissipate heat from the electronic chip upon heating up to or above the phase change temperature.

2. The electronic component of claim 1, wherein the phase change material is selected from the group consisting of a Heusler compound, CuMnAs, CuMnSb, nickel, and a ferrofluid.

3. The electronic component of claim 1, wherein the phase change material is configured to change between two non-ferromagnetic phases.

4. The electronic component of claim 3, wherein the phase change material is configured to change between an antiferromagnetic phase and a paramagnetic phase.

5. The electronic component of claim 1, wherein the phase change material comprises an electrically conductive material.

6. The electronic component of claim 1, wherein the phase change temperature is in a range between −

100°

C. and 700°

C.

7. The electronic component of claim 1, wherein the phase change material is configured so that a difference between a density of the phase change material in the different magnetic phases is less than 10%.

8. The electronic component of claim 1, wherein the phase change material is configured for undergoing a solid/solid phase transition.

9. The electronic component of claim 1, wherein the phase change material has a thickness of less than 5 μ

m.

10. The electronic component of claim 1, wherein the phase change material is configured to increase a heat capacity of the phase change material when changing phase in response to heating up to or above the phase change temperature.

11. The electronic component of claim 1, wherein the phase change material forms at least part of a chip metallization of the electronic chip.

12. The electronic component of claim 1, further comprising an intermediate layer between semiconductor material of the electronic chip and the phase change material.

13. The electronic component of claim 1, wherein the electronic chip is a semiconductor chip.

14. The electronic component of claim 1, wherein the electronic component is configured as a naked die with a surface metallization.

15. The electronic component of claim 14, wherein the phase change material forms at least part of the surface metallization.

16. The electronic component of claim 1, wherein the electronic component is configured as an encapsulated package.

17. The electronic component of claim 16, wherein the phase change material is arranged at least partially within an encapsulant of the encapsulated package.

18. The electronic component of claim 16, further comprising a heat dissipation body attached to form at least part of an exterior surface of the electronic component.

19. The electronic component of claim 18, wherein the phase change material forms at least part of the heat dissipation body.

20. The electronic component of claim 1, further comprising:

an at least partially electrically conductive connection element by which the electronic chip is connected; and

an encapsulant encapsulating at least part of the connection element and the electronic chip.

21. The electronic component of claim 20, wherein the phase change material forms at least part of the connection element.

22. The electronic component of claim 1, wherein the magnetic phase change material is configured to consume further energy when changing to a further magnetic phase in response to further heating up to or above a further phase change temperature above the phase change temperature, wherein the phase change material is thermally coupled with the electronic chip to thereby dissipate further heat from the electronic chip upon heating up to or above the further phase change temperature.

23. A method, comprising:

providing an electronic chip thermally coupled with a magnetic phase change material which is configured to consume energy when changing between different magnetic phases in response to heating up to or above a phase change temperature; and

operating the electronic chip and thereby generating heat which heats the phase change material up to or above the phase change temperature to thereby dissipate heat from the electronic chip by the phase change.

24. The method of claim 23, further comprising:

supplying energy consumed by the phase change material, when changing phase at least partially from ohmic heat dissipated by the electronic chip during operation of the electronic chip.