Integrated circuit having first and second magnetic field sensing elements

• US 10,069,063 B2
• Filed: 12/30/2016
• Issued: 09/04/2018
• Est. Priority Date: 01/20/2006
• Status: Active Grant

• Current Assignee: Allegro Microsystems Incorporated (Sanken Electric Company Limited)
• Original Assignee: Allegro Microsystems Incorporated (Sanken Electric Company Limited)
• Inventors: Doogue, Michael C., Taylor, William P., Mangtani, Vijay
• Primary Examiner(s): WHALEN, DANIEL B
• Application Number:
  US15/395,083
• Publication Number:
  US 20170110652A1
• Time in Patent Office: 613 Days
• Field of Search: None
• CPC Class Codes: B82Y 25/00 Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
• CPC Class Codes: G01R 15/08 Circuits for altering the measuring range
• CPC Class Codes: G01R 15/207 Constructional details independent of the type of device used
• CPC Class Codes: G01R 33/02 Measuring direction or magnitude of magnetic fields or magnetic flux G01R33/20 takes precedence
• CPC Class Codes: G01R 33/06 using galvano-magnetic devices
• CPC Class Codes: G01R 33/07 Hall effect devices
• CPC Class Codes: G01R 33/09 Magnetoresistive devices
• CPC Class Codes: G01R 33/093 using multilayer structures, e.g. giant magnetoresistance sensors thin magnetic films H01F10/00
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48137 the bodies being arranged next to each other, e.g. on a common substrate
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 23/49541 Geometry of the lead-frame
• CPC Class Codes: H01L 25/162 the devices being mounted on two or more different substrates
• 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 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/3025 Electromagnetic shielding
• CPC Class Codes: H10N 50/10 Magnetoresistive devices
• CPC Class Codes: H10N 50/80 Constructional details
• CPC Class Codes: H10N 52/101 Semiconductor Hall-effect devices
• CPC Class Codes: H10N 52/80 Constructional details

Abstract

An integrated circuit can have a first substrate supporting a magnetic field sensing element and a second substrate supporting another magnetic field sensing element. The first and second substrates can be arranged in a variety of configurations. Another integrated circuit can have a first magnetic field sensing element and second different magnetic field sensing element disposed on surfaces thereof.

Claims

1. An integrated circuit, comprising:

a lead frame;

a first substrate having first and second opposing surfaces, wherein the first substrate is coupled to the lead frame such that the second surface of the first substrate is above the lead frame and the first surface of the first substrate is above the second surface of the first substrate;

a second substrate having first and second opposing surfaces, wherein the second substrate is coupled to the lead frame such that the second surface of the second substrate is above the lead frame and the first surface of the second substrate is above the second surface of the second substrate;

an electronic component disposed on the first surface of the first substrate or on the first surface of the second substrate;

a first magnetic field sensing element disposed on the first surface of the second substrate; and

a second magnetic field sensing element disposed on the first surface of the first substrate,

wherein the first magnetic field sensing element has a first sensitivity to a magnetic field, wherein the second magnetic field sensing element has a second sensitivity to the magnetic field different than the first sensitivity, and wherein the integrated circuit is configured to provide a first operating range responsive to the first magnetic field sensing element and a second operating range different than the first operating range responsive to the second magnetic field sensing element.

2. The integrated circuit of claim 1, wherein the first and second substrates are comprised of different materials.

3. The integrated circuit of claim 2, wherein the first substrate is comprised of Si and the second substrate is comprised of GaAs.

4. The integrated circuit of claim 2, wherein the first substrate is comprised of GaAs and the second substrate is comprised of Si.

5. The integrated circuit of claim 2, wherein the lead frame comprises a plurality of leads, wherein at least two of the plurality of leads are coupled to form a current conductor portion, wherein the current conductor portion is disposed proximate to the second substrate, and wherein the first and second magnetic field sensing elements are configured to be responsive to a current flowing through the current conductor portion.

6. The integrated circuit of claim 1, wherein the first surface of the second substrate is coupled to the first surface of the first substrate with a wire bond.

7. The integrated circuit of claim 1, wherein the lead frame comprises a plurality of leads, wherein at least two of the plurality of leads are coupled to form a current conductor portion, wherein the current conductor portion is disposed proximate to the second substrate, and wherein the first and second magnetic field sensing elements are configured to be responsive to a current flowing through the current conductor portion.

8. The integrated circuit of claim 1, wherein the first and second magnetic field sensing elements are configured to be responsive to a current passing through a conductor proximate to and outside of the integrated circuit.

9. The integrated circuit of claim 1, further including at least one flux concentrator disposed proximate to at least one of the first magnetic field sensing element or the second magnetic field sensing element.

10. The integrated circuit of claim 1, further comprising:

a current conductor disposed proximate to the second substrate; and

a flux concentrator shaped so that a first portion of the flux concentrator is disposed under the lead frame and a second portion of the flux concentrator is disposed above the first surface of the second substrate.

11. The integrated circuit of claim 1, wherein the first magnetic field sensing element is a Hall effect element and the second magnetic field sensing element is a magnetoresistance element.

12. The integrated circuit of claim 11, wherein the lead frame comprises a plurality of leads, wherein at least two of the plurality of leads are coupled to form a current conductor portion, wherein the current conductor portion is disposed proximate to the first and second magnetic field sensing elements, and wherein the first and second magnetic field sensing elements are configured to be responsive to a current flowing through the current conductor portion.

13. The integrated circuit of claim 1, wherein the first magnetic field sensing element is a planar Hall effect element and the second magnetic field sensing element is a vertical Hall effect element.

14. The integrated circuit of claim 13, wherein the lead frame comprises a plurality of leads, wherein at least two of the plurality of leads are coupled to form a current conductor portion, wherein the current conductor portion is disposed proximate to the first and second magnetic field sensing elements, and wherein the first and second magnetic field sensing elements are configured to be responsive to a current flowing through the current conductor portion.

15. The integrated circuit of claim 1, wherein the electronic component comprises a passive electronic component or an active electronic component.

16. The integrated circuit of claim 1, wherein the lead frame comprises a plurality of leads, wherein at least two of the plurality of leads are coupled to form a current conductor portion, wherein the current conductor portion is disposed proximate to the first and second magnetic field sensing elements, and wherein the first and second magnetic field sensing elements are configured to be responsive to a current flowing through the current conductor portion.

17. The integrated circuit of claim 1, further comprising a current conductor disposed proximate the first and second magnetic field sensing elements, wherein the first and second magnetic field sensing elements are configured to be responsive to magnetic field generated by a current passing through the current conductor.