公开(公告)号：US12265103B2

公开(公告)日：2025-04-01

申请号：US17817796

申请日：2022-08-05

Applicant: Allegro MicroSystems, LLC

Inventor： Robert A. Briano ,  Michael C. Doogue ,  William P. Taylor

IPC: G01R19/00 ,  G01R15/14 ,  G01R15/20 ,  H01L21/48 ,  H01L23/00 ,  H01L23/495 ,  H05K1/11 ,  H05K1/18 ,  H05K3/30

Abstract: A sensor package comprising a lead frame, a current sensor die, and an interposer. The lead frame includes: (i) a primary conductor, (ii) a plurality of secondary leads, and (iii) a layer of dielectric material that is disposed between the primary conductor and the plurality of secondary leads. The current sensor die includes one or more sensing elements. The current sensor die is configured to measure a level of electrical current through the primary conductor of the lead frame. The interposer is disposed over the layer of dielectric material. The interposer includes a plurality of conductive traces that are configured to couple each of a plurality of terminals of the current sensor die to a respective one of the plurality of secondary leads.

公开(公告)号：US20200241084A1

公开(公告)日：2020-07-30

申请号：US16851473

申请日：2020-04-17

Applicant: Allegro MicroSystems, LLC

Inventor： Alexander Latham ,  Michael C. Doogue ,  Jason Boudreau

IPC: G01R33/00 ,  G01R33/025 ,  G01R33/032 ,  G01R33/12 ,  G01N27/90 ,  H01F5/00

Abstract: An apparatus comprises a first substrate and two coils supported by the first substrate and arranged next to each other, the coils configured to each generate a magnetic field which produces eddy currents in and a reflected magnetic field from a conductive target, the two coils arranged so their respectively generated magnetic fields substantially cancel each other in an area between the coils. One or more magnetic field sensing elements are positioned in the area between the coils and configured to detect the reflected magnetic field.

公开(公告)号：US10571301B2

公开(公告)日：2020-02-25

申请号：US15655400

申请日：2017-07-20

Applicant: Allegro MicroSystems, LLC

Inventor： Michael C. Doogue ,  P. Karl Scheller

IPC: G01D5/14 ,  G01P3/487 ,  G01R33/07 ,  G01D5/165 ,  G01R33/09 ,  G01D3/08 ,  G01P13/04

Abstract: In one aspect, an integrated circuit (IC) includes a magnetic field sensor to detect speed and direction of angular rotation of a rotating magnetic structure. The magnetic field sensor includes at least two magnetic field sensing elements configured to sense changes in a magnetic field caused by rotation of the magnetic structure. The IC also includes an output port configured to provide an output signal of the magnetic field sensor. The frequency of the output signal indicates the speed and the direction or indicates a fault.

公开(公告)号：US20190285667A1

公开(公告)日：2019-09-19

申请号：US16421982

申请日：2019-05-24

Applicant: Allegro MicroSystems, LLC

Inventor： Shaun D. Milano ,  Bryan Cadugan ,  Michael C. Doogue ,  Alexander Latham ,  William P. Taylor ,  Harianto Wong ,  Sundar Chetlur

IPC: G01R15/14 ,  G01R15/20 ,  G01R19/00

Abstract: Systems and methods described herein are directed towards integrating a shield layer into a current sensor to shield a magnetic field sensing element and associated circuitry in the current sensor from electrical, voltage, or electrical transient noise. In an embodiment, a shield layer may be disposed along at least one surface of a die supporting a magnetic field sensing element. The shield layer may be disposed in various arrangements to shunt noise caused by a parasitic coupling between the magnetic field sensing element and the current carrying conductor away from the magnetic field sensing element.

公开(公告)号：US10310028B2

公开(公告)日：2019-06-04

申请号：US15606362

申请日：2017-05-26

Applicant: Allegro MicroSystems, LLC ,  COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES

Inventor： Alexander Latham ,  Michael C. Doogue ,  Claude Fermon ,  Xavier Du Hamel De Milly ,  Myriam Pannetier-Lecoeur

IPC: G01R33/07 ,  G01R33/00 ,  G01R33/09 ,  G01R33/30 ,  G01L9/00 ,  G01L13/02

Abstract: A pressure sensor includes a chamber comprising a conductive portion and a deformable portion coupled to the conductive portion and susceptible to deformation in response to a pressure differential between an interior of the chamber and an exterior of the chamber; at least one coil responsive to an AC coil drive signal; at least one magnetic field sensing element disposed proximate to the at least one coil and to the conductive portion of the chamber and configured to generate a magnetic field signal in response to a reflected magnetic field generated by the at least one coil and reflected by the conductive portion; and a circuit coupled to the at least one magnetic field sensing element to generate an output signal of the pressure sensor indicative of the pressure differential between the interior of the chamber and the exterior of the chamber in response to the magnetic field signal.

公开(公告)号：US20190067562A1

公开(公告)日：2019-02-28

申请号：US15689185

申请日：2017-08-29

Applicant: Allegro MicroSystems, LLC

Inventor： Sundar Chetlur ,  Harianto Wong ,  Maxim Klebanov ,  William P. Taylor ,  Michael C. Doogue

IPC: H01L43/06 ,  H01L43/04 ,  H01L43/08 ,  H01L43/14 ,  H01L25/065

Abstract: Methods and apparatus for a signal isolator having a dielectric interposer supporting first and second die each having a magnetic field sensing element. A first signal path extends from the first die to the second die and a second signal path extends from the second die to the first die. In embodiments, the first signal path is located in the interposer and includes a first coil to generate a magnetic field and the second signal path is located in the interposer and includes a second coil to generate a magnetic filed. The first coil is located in relation to the second magnetic field sensing element of the second die and the second coil is located in relation to the first magnetic field sensing element of the first die.

公开(公告)号：US20190049527A1

公开(公告)日：2019-02-14

申请号：US16165464

申请日：2018-10-19

Applicant: Allegro MicroSystems, LLC

Inventor： Ravi Vig ,  William P. Taylor ,  Andreas P. Friedrich ,  Paul A. David ,  Marie-Adelaide Lo ,  Eric Burdette ,  Eric G. Shoemaker ,  Michael C. Doogue

IPC: G01R33/00 ,  G01B7/30

Abstract: A magnetic field sensor includes a lead frame, a passive component, semiconductor die supporting a magnetic field sensing element and attached to the lead frame, a non-conductive mold material enclosing the die and at least a portion of the lead frame, and a ferromagnetic mold material secured to a portion of the non-conductive mold material. The lead frame has a recessed region and the passive component is positioned in the recessed region. The ferromagnetic mold material may comprise a soft ferromagnetic material to form a concentrator or a hard ferromagnetic material to form a bias magnet.

公开(公告)号：US20180340987A1

公开(公告)日：2018-11-29

申请号：US15606262

申请日：2017-05-26

Applicant: Allegro MicroSystems, LLC

Inventor： Alexander Latham ,  Michael C. Doogue ,  Jason Boudreau

IPC: G01R33/00 ,  G01R33/025 ,  H01F5/04

CPC classification number: G01R33/0094 ,  G01R33/0005 ,  G01R33/0011 ,  G01R33/0017 ,  G01R33/0029 ,  G01R33/025 ,  G01R33/032 ,  G01R33/1284 ,  H01F5/04

Abstract: An apparatus comprises one or more substrates and one or more coils. At least one of the coils is configured to produce a first magnetic field that induces eddy currents in a conductive target, which generates a reflected magnetic field. One or more magnetic field sensing elements supported by the one or more substrates detect the reflected magnetic field. A conductive support structure supports the one or more substrates. The support structure includes a gap in an area adjacent to the one or more coils so that the support structure does not generate a reflected magnetic field in response to the first magnetic field.

公开(公告)号：US10073136B2

公开(公告)日：2018-09-11

申请号：US14578789

申请日：2014-12-22

Applicant: ALLEGRO MICROSYSTEMS, LLC

Inventor： Shaun D. Milano ,  Georges El Bacha ,  Michael C. Doogue ,  William P. Taylor

IPC: G01R33/06 ,  G01R31/28 ,  G01R33/00 ,  G01R31/3187 ,  G01R33/02 ,  G01R33/07 ,  G01R33/09 ,  G01R35/00

Abstract: Methods and apparatus to provide an integrated circuit having a magnetic sensing element having differential first and second outputs and an input, the input to receive current and first and second switches coupled to a respective one of the differential first and second outputs. A first voltage source is coupled between the first and second switches, the first and second switches having a first state in which the first voltage source is coupled across the differential first and second outputs, and an IC output can output a voltage corresponding to the first voltage source when the first and second switches are in the first state for monitoring operation of a signal path from the magnetic sensing element to the IC output.

公开(公告)号：US09859489B2

公开(公告)日：2018-01-02

申请号：US14707319

申请日：2015-05-08

Applicant: Allegro MicroSystems, LLC

Inventor： Michael C. Doogue ,  William P. Taylor ,  Vijay Mangtani

IPC: H01L29/82 ,  H01L43/08 ,  H01L43/04 ,  B82Y25/00 ,  G01R15/20 ,  G01R33/02 ,  G01R33/07 ,  G01R33/09 ,  H01L25/16 ,  G01R33/06 ,  H01L43/06 ,  G01R15/08

CPC classification number: H01L43/02 ,  B82Y25/00 ,  G01R15/08 ,  G01R15/207 ,  G01R33/02 ,  G01R33/06 ,  G01R33/07 ,  G01R33/09 ,  G01R33/093 ,  H01L23/49541 ,  H01L25/162 ,  H01L43/04 ,  H01L43/065 ,  H01L43/08 ,  H01L2224/48091 ,  H01L2224/48137 ,  H01L2224/48247 ,  H01L2924/3025 ,  H01L2924/00014 ,  H01L2924/00

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.