The magnetic field sensor integrated circuit which has one ferromagnetism material

Title:

The magnetic field sensor integrated circuit which has one ferromagnetism material

Document Type and Number:

Japanese Patent JP6270900

Kind Code:

B2

Abstract:

A magnetic field sensor includes: a lead frame having a first surface, a second opposing surface, at least one slot extending from the first surface to the second surface in a vertical direction, and a plurality of leads; a semiconductor die having a first surface in which a magnetic field sensing element is disposed and a second opposing surface attached to the first surface of the lead frame, wherein the at least one slot is aligned with the semiconductor die in the vertical direction; a non-conductive mold material enclosing the die and at least a portion of the lead frame, the non-conductive mold material having a first surface adjacent to the first surface of the semiconductor die and a second opposing surface adjacent to the second surface of the lead frame, wherein the non-conductive mold material comprises a protrusion having tapered side walls extending from the second surface of the non-conductive mold material; and a conductive coil secured to the second surface of the non-conductive mold material and positioned concentrically with respect to the protrusion of the non-conductive mold material, wherein the conductive coil is configured to operate as a back bias magnet to provide a magnetic field used to detect movement of a target.

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Inventors:

Vig, Ravi
Taylor, William Pea
David, Paul
Scheller, Pea Curl
Friedrich, Andreas P.
Rho, Marie-Adeleide
Burdett, Eric
Eric, showmaker
Doug, Michael Sea

Application Number:

JP2016084148A

Publication Date:

January 31, 2018

Filing Date:

April 20, 2016

Export Citation:

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Assignee:

Allegro Microsystems LRC

International Classes:

G01R33/02; G01R33/06; H01L23/29; H01L23/31; H01L25/00; H01L43/02; H01L43/04

Domestic Patent References:

JP590918U

Foreign References:

US20120013333

Attorney, Agent or Firm:

Shinjiro Ono
Yasushi Kobayashi
Shigeo Takeuchi
Osamu Yamamoto
Kenichi Torii

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