Integrated circuit including sensor having injection molded magnetic material
First Claim
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1. An integrated circuit comprising:
- a magnetic field sensor comprising a die including a magnetic field sensitive element;
a bond wire electrically coupled to the die; and
an injection molded magnetic material directly contacting the bond wire, enclosing at least a portion of the magnetic field sensor and directly contacting at least a portion of the die,wherein the injection molded magnetic material comprises;
first injection molded magnetic material having a first thickness on a first side of the magnetic field sensor; and
second injection molded magnetic material having a second thickness greater than the first thickness, the second injection molded magnetic material on a second side of the magnetic field sensor opposite the first side,wherein the first injection molded magnetic material is opposite the second injection molded magnetic material,wherein the first injection molded magnetic material has a first remanence,wherein the second injection molded magnetic material has a second remanence less than the first remanence, andwherein the thickness of the first injection molded magnetic material times the first remanence equals the thickness of the second injection molded magnetic material times the second remanence.
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Abstract
An integrated circuit includes a magnetic field sensor and an injection molded magnetic material enclosing at least a portion of the magnetic field sensor.
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Citations
12 Claims
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1. An integrated circuit comprising:
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a magnetic field sensor comprising a die including a magnetic field sensitive element; a bond wire electrically coupled to the die; and an injection molded magnetic material directly contacting the bond wire, enclosing at least a portion of the magnetic field sensor and directly contacting at least a portion of the die, wherein the injection molded magnetic material comprises; first injection molded magnetic material having a first thickness on a first side of the magnetic field sensor; and second injection molded magnetic material having a second thickness greater than the first thickness, the second injection molded magnetic material on a second side of the magnetic field sensor opposite the first side, wherein the first injection molded magnetic material is opposite the second injection molded magnetic material, wherein the first injection molded magnetic material has a first remanence, wherein the second injection molded magnetic material has a second remanence less than the first remanence, and wherein the thickness of the first injection molded magnetic material times the first remanence equals the thickness of the second injection molded magnetic material times the second remanence. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An integrated circuit comprising:
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a magnetic field sensor comprising a die including a magnetic field sensitive element; a bond wire electrically coupled to the die; and an injection molded magnetic material directly contacting the bond wire, enclosing at least a portion of the magnetic field sensor and directly contacting at least a portion of the die, wherein the injection molded magnetic material comprises; first injection molded magnetic material having a first thickness on a first side of the magnetic field sensor; and second injection molded magnetic material having a second thickness greater than the first thickness, the second injection molded magnetic material on a second side of the magnetic field sensor opposite the first side, wherein the first injection molded magnetic material is opposite the second injection molded magnetic material, wherein the second injection molded magnetic material includes a recessed portion centered with the die and configured to reduce a magnetic field component parallel to the die such that the magnetic field sensitive element is not saturated, and wherein at least three sidewalls of the recessed portion are defined by the second injection molded magnetic material.
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8. A system comprising:
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a magnetic field sensor; and a controller coupled to the magnetic field sensor, wherein the magnetic field sensor comprises; a leadframe; a die including a magnetic field sensitive element, the die coupled to a front side of the leadframe; a magnetic material injection molded directly over a back side of the leadframe such that the magnetic material forms a first plastic bonded magnet directly contacting the leadframe opposite the die; and magnetic material injection molded over the die to form a second plastic bonded magnet directly contacting the die. - View Dependent Claims (9)
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10. A sensor comprising:
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a leadframe; a die including magnetic field sensitive elements, the die coupled to a front side of the leadframe; pins; bond wires electrically coupling the die to the pins; a first magnetic material injection molded directly on a back side of the leadframe such that the first magnetic material forms a plastic bonded magnet directly contacting the leadframe opposite the die; and a second magnetic material injection molded directly on the die, wherein the second magnetic material has a remanence greater than a remanence of the first magnetic material. - View Dependent Claims (11)
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12. A method for fabricating an integrated circuit, the method comprising:
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providing a magnetic field sensor comprising a die including magnetic field sensitive elements; and injection molding magnetic material directly on the magnetic field sensitive elements,H wherein the injection molding magnetic material comprises; injection molding a first magnetic material having a first remanence over a first side of the magnetic field sensor; and injection molding a second magnetic material having a second remanence less than the first remanence over a second side of the magnetic field sensor opposite the first side.
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Specification