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Home > Press Release > Chip coil
NR05F1E (Date of release: March 27, 2006


Ultra Low Profile, Wire Wound Type Chip Coil
for DC-DC Converter Circuits
-0806 EIA Size LQH2MC Series-

Chip Coil

Text

Murata Manufacturing Co., Ltd. has manufactured for commercial use a wire wound type, ultra low profile chip coil, 'LQH2MC' series, for DC-DC converter circuits to be used in small mobile equipment such as cellular phones.

By applying Murata's own ferrite formation and wire wound technology a size of 2.0x1.6x0.7 (max.) mm is now available, making this the lowest profile wire wound type product for DC-DC converter circuits in the industry.

Current and frequency characteristics are equivalent to conventional LQH_C product (i.e. flat inductance over DC current and excellent Q versus frequency) making it suitable for the switching frequency range of DC-DC converter circuitry.

The current line-up includes inductance values ranging between 1.0 and 10µH.

This product does not contain substances designated by RoHS directive (*1).

Mass production will start in April 2006. Production of 3 million units per month is scheduled.

The product will be exhibited at Murata booth at Techno-Frontier 2006 held at Makuhari Messe, Chiba City, Chiba, Japan Prefecture starting on April 19.


Background

Compact mobile equipment including cellular phones have started to incorporate DC-DC converter circuits to lengthen their battery life. Recently, however, more numbers of DC-DC converter circuits are being installed due to further product downsizing and the trend towards multi-featured equipment.



Terminology

*1 RoHS directive:
RoHS directive limits the use of lead, cadmium, mercury, hexavalent chromium, PBB and PBDE in electric and electronic equipments, scheduled to be executed by the European Union in July 2006.


Features

  • Compact, ultra low profile (height 0.7mm max.)
  • Flat inductance - current characteristics
  • Low leakage flux is realized despite being an open magnetic circuit
  • Usable with lead-free Sn-Ag-Cu type circuit allowing reflow soldering at the peak temperature of 245°C


Applications

  • DC-DC converter circuit for compact mobile equipment


Dimensions

Dimensions


Part Number and Specification

Operating Temperature Range: -40 to +85° C
Strage Temperature Range: -40 to +85° C

Part Number Inductance
(µH)
Test Frequency
(MHz)
Rated Current
(mA)
DC resistance
(ohm)

Self Resonance Frequency
(min.)
(MHz)

LQH2MCN1R0M52L 1.0±20% 1 595 0.25±30% 215
LQH2MCN1R5M52L 1.5±20% 1 540 0.33±30% 165
LQH2MCN2R2M52L 2.2±20% 1 500 0.42±30% 125
LQH2MCN3R3M52L 3.3±20% 1 360 0.74±30% 110
LQH2MCN4R7M52L 4.7±20% 1 335 0.91±30% 90
LQH2MCN6R8M52L 6.8±20% 1 285 1.23±30% 65
LQH2MCN100M52L 10±20% 1 200 2.27±30% 60


Characteristics

Inductance - Direct Current Characteristics (Typ.)
Inductance - Direct Current Characteristics

Q - Frequency Characteristics (Typ.)
Q - Frequency Characteristics


Starting Month for Sales

April 2006

Production Capacity

3 million units per month, schedules starting in April 2006

Patent

Two patent applications filed
Four patents pending



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