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公开(公告)号：US10991644B2
公开(公告)日：2021-04-27
申请号：US16547814
申请日：2019-08-22
Applicant: Allegro MicroSystems, LLC
Inventor： Paul A. David , Harry Chandra , William P. Taylor
IPC: H01L21/00 , H01L23/495 , H01L23/31 , H01L21/56 , H01L43/06 , H01L43/12 , H01L25/065 , G01R33/07 , G01R33/00 , H01L31/0203
Abstract: A method of providing a sensor IC package can include applying a film to a leadframe having first and second surfaces, mounting at least one component to the film, and applying a pre-mold material to cover at least a portion of the leadframe and the passive component while leaving a first side of the leadframe exposed. The film can be removed and a die attached to the first side of the leadframe. At least one electrical connection can be formed between the die and the leadframe. The assembly of the die, the leadframe, and the pre-mold material can be encapsulated with a final mold material to provide a low profile IC package.
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公开(公告)号：US20210111284A1
公开(公告)日：2021-04-15
申请号：US17130085
申请日：2020-12-22
Applicant: Allegro MicroSystems, LLC
Inventor： Ravi Vig , William P. Taylor , Paul A. David , P. Karl Scheller , Andreas P. Friedrich
Abstract: A magnetic field sensor includes a lead frame, a semiconductor die having a first surface in which a magnetic field sensing element is disposed and a second surface attached to the lead frame, and a non-conductive mold material enclosing the die and at least a portion of the lead frame. The sensor may include a ferromagnetic mold material secured to a portion of the non-conductive mold material. Features include a multi-sloped taper to an inner surface of a non-contiguous central region of the ferromagnetic mold material, a separately formed element disposed in the non-contiguous central region, one or more slots in the lead frame, a molded ferromagnetic suppression device spaced from the non-conductive mold material and enclosing a portion of a lead, a passive device spaced from the non-conductive mold material and coupled to a plurality of leads, and a ferromagnetic bead coupled to a lead. Also described is a coil secured to the non-conductive mold material and a lead having at least two separated portions with a passive component coupled across the two portions.
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公开(公告)号：US20210011097A1
公开(公告)日：2021-01-14
申请号：US16507544
申请日：2019-07-10
Applicant: Allegro Microsystems, LLC
Inventor： Paul A. David , Remy Lassalle-Balier , Jeffrey Eagen , Damien Dehu
Abstract: A system includes a ring magnet having magnetic segments and configured to rotate about an axis of rotation, wherein adjacent segments have different magnetic polarities, The system can further include a substrate positioned so that a top surface of the substrate is substantially parallel to the axis of rotation and a center plane passing through the ring magnet and perpendicular to the axis of rotation of the ring magnet intersects the top surface at an intersection line. The system can further include four magnetic field sensing elements supported by the substrate and electrically coupled to form a first bridge circuit, wherein two of the four magnetic field sensing elements are positioned on one side of the intersection line and the other two of the four magnetic field sensing elements are positioned on the other side of the intersection line.
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公开(公告)号：US20200249286A1
公开(公告)日：2020-08-06
申请号：US16856582
申请日：2020-04-23
Applicant: Allegro MicroSystems, LLC
Inventor： Paul A. David , William P. Taylor
Abstract: Methods and apparatus for detecting a magnetic field include a semiconductor substrate, a coil configured to provide a changing magnetic field in response to a changing current in the coil; and a magnetic field sensing element supported by the substrate. The coil receives the changing current and, in response, generates a changing magnetic field. The magnetic field sensing element detects the presence of a magnetic target by detecting changes to the magnetic field caused by the target and comparing them to an expected value.
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公开(公告)号：US10670672B2
公开(公告)日：2020-06-02
申请号：US16029826
申请日：2018-07-09
Applicant: Allegro MicroSystems, LLC
Inventor： Paul A. David , William P. Taylor
Abstract: Methods and apparatus for detecting a magnetic field include a semiconductor substrate, a coil configured to provide a changing magnetic field in response to a changing current in the coil; and a magnetic field sensing element supported by the substrate. The coil receives the changing current and, in response, generates a changing magnetic field. The magnetic field sensing element detects the presence of a magnetic target by detecting changes to the magnetic field caused by the target and comparing them to an expected value.
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Patent Agency Ranking
公开(公告)号：US20190157465A1
公开(公告)日：2019-05-23
申请号：US16252789
申请日：2019-01-21
Applicant: Allegro MicroSystems, LLC
Inventor： Ravi Vig , William P. Taylor , Paul A. David , P. Karl Scheller , Andreas P. Friedrich
Abstract: A magnetic field sensor includes a lead frame, a semiconductor die having a first surface in which a magnetic field sensing element is disposed and a second surface attached to the lead frame, and a non-conductive mold material enclosing the die and at least a portion of the lead frame. The sensor may include a ferromagnetic mold material secured to a portion of the non-conductive mold material. Features include a multi-sloped taper to an inner surface of a non-contiguous central region of the ferromagnetic mold material, a separately formed element disposed in the non-contiguous central region, one or more slots in the lead frame, a molded ferromagnetic suppression device spaced from the non-conductive mold material and enclosing a portion of a lead, a passive device spaced from the non-conductive mold material and coupled to a plurality of leads, and a ferromagnetic bead coupled to a lead. Also described is a coil secured to the non-conductive mold material and a lead having at least two separated portions with a passive component coupled across the two portions.
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公开(公告)号：US10215590B2
公开(公告)日：2019-02-26
申请号：US15176668
申请日：2016-06-08
Applicant: Allegro MicroSystems, LLC
Inventor： Paul A. David , Ravi Vig
Abstract: A back-biased magnetic field sensor can have one or more vertical Hall effect elements arranged within a substrate region of a substrate, wherein magnetic fields are oriented substantially vertical to the substrate within the substrate region when a ferromagnetic object is not proximate. When the ferromagnetic object becomes proximate, the magnetic field sensor can sense at least the proximity, and, in some embodiments, can also localize a position of the ferromagnetic object relative to the magnetic field sensor.
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公开(公告)号：US10041810B2
公开(公告)日：2018-08-07
申请号：US15176665
申请日：2016-06-08
Applicant: Allegro MicroSystems, LLC
Inventor： Ravi Vig , Paul A. David , Eric G. Shoemaker
Abstract: Magnetic field sensors can sense speed of movement and direction of movement of a ferromagnetic object. The magnetic field sensors employ both planar Hall effect elements and vertical Hall effect elements to generate two-state signals in two different signal paths with relative phases that are ninety degrees apart, the ninety degrees having sufficient margin to aid in detection of the direction of motion. Other magnetic field sensors use at least four vertical Hall effect elements to identify a speed of rotation and a direction of rotation of a moving ferromagnetic object.
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公开(公告)号：US10036785B2
公开(公告)日：2018-07-31
申请号：US15212643
申请日：2016-07-18
Applicant: Allegro MicroSystems, LLC
Inventor： Paul A. David , William P. Taylor
CPC classification number: G01R33/09 , G01R33/0052 , G01R33/093 , G01R33/098
Abstract: In one aspect, an integrated circuit (IC) includes a sensor that includes a first magnetoresistive (MR) element and a second MR element less active to a presence of a magnetic field than the first MR element. The second MR element includes a metal layer diffused into other layers of the second MR element.
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公开(公告)号：US09880026B1
公开(公告)日：2018-01-30
申请号：US15210211
申请日：2016-07-14
Applicant: Allegro Microsystems, LLC
Inventor： Jeffrey Eagen , Paul A. David , William P. Taylor
CPC classification number: G01D5/165 , G01D5/145 , G01R33/09 , G01R33/093
Abstract: A magnetic field sensor for detecting motion of an object includes a magnet configured to generate a magnetic field and having a first surface adjacent to the object and a second surface distal from the object. The first surface of the magnet has a centerline axis substantially parallel to and disposed on the first surface, and the centerline axis is diagonal with respect to a motion axis substantially parallel to and disposed on the first surface and parallel to which the object moves. The magnetic field sensor also includes a semiconductor substrate disposed between the magnet and the object, the semiconductor substrate supporting a plurality of spaced magnetoresistance elements disposed along a sensing element axis substantially parallel to the centerline axis of the magnet and configured to generate a respective plurality of magnetic field signals in response to the motion of the object with respect to magnetic field.
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