# US 11,443,890 B2 · Surface mount coil component and manufacturing method for the same, and DC-DC converter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,443,890 B2 - Document ID: US11443890B2 - Status: Granted - Kind: B2 - Application number: 16/016,701 - Filed: 2018-06-25 - Published: 2018-10-25 - Granted: 2022-09-13 - Earliest claimed: 2016-01-28 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Noboru Kato; Satoshi Ishino; Mitsuyoshi Nishide; Shinichiro Banba - Web page: https://patentgrep.com/patent/US11443890B2 ## CPC - H01F 27/292: {Surface mounted devices} - H01F 17/04: with magnetic core - H01F 27/24: Magnetic cores - H01F 27/2823: {Wires (H01F27/2866 takes precedence)} - H01F 27/32: Insulating of coils, windings, or parts thereof - H01F 41/0206: {Manufacturing of magnetic cores by mechanical means (magnetic cores per se H01F27/24)} - H01F 41/04: for manufacturing coils {(coils for transformer or inductances H01F27/28)} - H01F 41/10: Connecting leads to windings (making electric connections in general H01R43/00) - H02M 3/003: {Constructional details, e.g. physical layout, assembly, wiring or busbar connections} - H01F 2017/048: {with encapsulating core, e.g. made of resin and magnetic powder} - H02M 3/00: Conversion of DC power input into DC power output - H02M 3/155: using semiconductor devices only - H05K 1/0271: {Arrangements for reducing stress or warp in rigid printed circuit boards, e.g. caused by loads, vibrations or differences in thermal expansion} - H05K 1/165: {incorporating printed inductors} - H05K 1/181: associated with surface mounted components - H05K 2201/0129: Thermoplastic polymer, e.g. auto-adhesive layer; Shaping of thermoplastic polymer - H05K 2201/086: for inductive purposes, e.g. printed inductor with ferrite core - H05K 2201/10015: Non-printed capacitor - H05K 2201/1003: Non-printed inductor - H05K 2201/10053: Switch - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract A surface mount coil component includes an element body defining a compact including magnetic material particles; a coil that is buried, excluding an end portion of the coil, in the element body; and an input-output terminal electrically connected to the end portion of the coil. A thermoplastic resin layer is provided on a surface on a mounting surface side of the element body. An interlayer connection conductor is provided in the thermoplastic resin layer. The input-output terminal is provided on a surface of the thermoplastic resin layer and is electrically connected to the end portion of the coil via the interlayer connection conductor. ## Claims ### Claim 1 A surface mount coil component comprising: an element body defining a compact including magnetic material particles; a coil that is buried, excluding an end portion of the coil, in the element body; and an input-output terminal electrically connected to the end portion of the coil; wherein a thermoplastic resin layer is provided on a surface on a mounting surface side of the element body; an interlayer connection conductor is provided in the thermoplastic resin layer; the input-output terminal is provided on a surface of the thermoplastic resin layer and is electrically connected to the end portion of the coil via the interlayer connection conductor; the end portion of the coil projects from the surface of the element body and is positioned inside the interlayer connection conductor; and a width of a wire defining the end portion of the coil is smaller than a width of the interlayer connection conductor. ### Claim 2 (depends on 1) The surface mount coil component according to claim 1, wherein the magnetic material particles are magnetic metal powder, and the element body is a pressurized powder compact including the magnetic metal powder. ### Claim 3 (depends on 1) The surface mount coil component according to claim 1, wherein a plating film is provided on a surface of the input-output terminal. ### Claim 4 (depends on 1) The surface mount coil component according to claim 1, wherein an intermetallic compound is included in a bonding portion between the interlayer connection conductor and the end portion of the coil. ### Claim 5 (depends on 1) The surface mount coil component according to claim 1, wherein a thermoplastic resin layer is provided on a rear surface of the element body. ### Claim 6 (depends on 1) The surface mount coil component according to claim 1, wherein the coil is an air-core coil defined by a copper-based wound wire member. ### Claim 7 (depends on 6) The surface mount coil component according to claim 6, wherein an insulating coating is provided on a surface of the wire member. ### Claim 8 A DC-DC converter comprising: a switching element; and a choke coil connected to the switching element; wherein the choke coil includes: an element body defining a compact including magnetic material particles; a coil that is buried, excluding an end portion of the coil, in the element body; and an input-output terminal electrically connected to the end portion of the coil; a thermoplastic resin layer is provided on a surface on a mounting surface side of the element body; an interlayer connection conductor is provided in the thermoplastic resin layer; the input-output terminal is provided on a surface of the thermoplastic resin layer and is electrically connected to the end portion of the coil via the interlayer connection conductor; the end portion of the coil projects from the surface of the element body and is positioned inside the interlayer connection conductor; and a width of a wire defining the end portion of the coil is smaller than a width of the interlayer connection conductor. ### Claim 9 (depends on 8) The DC-DC converter according to claim 8, wherein the magnetic material particles are magnetic metal powder, and the element body is a pressurized powder compact including the magnetic metal powder. ### Claim 10 (depends on 8) The DC-DC converter according to claim 8, wherein a plating film is provided on a surface of the input-output terminal. ### Claim 11 (depends on 8) The DC-DC converter according to claim 8, wherein an intermetallic compound is included in a bonding portion between the interlayer connection conductor and the end portion of the coil. ### Claim 12 (depends on 8) The DC-DC converter according to claim 8, wherein a thermoplastic resin layer is provided on a rear surface of the element body. ### Claim 13 (depends on 8) The DC-DC converter according to claim 8, wherein the coil is an air-core coil defined by a copper-based wound wire member. ### Claim 14 (depends on 13) The DC-DC converter according to claim 13, wherein an insulating coating is provided on a surface of the wire member.