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Distributing to long-time operation and reducing the size of mobile phones or mobile units etc.

Announcing the release of the Chip Choke Coils with low DC resistance value

Realizing the lowest DC resistance (DCR) value in the industry (*1)

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June 10, 2009, Osaka Japan--Panasonic Electronic Devices Co., Ltd. has succeeded in commercializing the Chip Choke Coils with low DC resistance value used for high effective DC/DC converters, which feature long-time operation of mobile units etc.

Product name	Chip Choke Coils
Series name	ELL3FU series
Production start	June 2009
Sample price	50 yen/piece
Production capacity	3 million pieces/month

Wire winding type choke coils have been installed in DC/DC converter circuits used for mobile units including mobile phones, digital still-cameras, hard-disc drivers, because comparative large current flows in them. Recently, a variety of power supply circuits in mobile units have been required to be effective in order to increase the battery-operation time of units, and the products with low DCR (direct current resistance) have been required. To meet the market demand, Panasonic Electronic Devices Co. Ltd. has developed the choke coil with low DC resistance in the top level in the industry (*1), which is useful for improving the effectiveness and for reducing the size of power supply circuits. Newly developed choke coils contribute to increasing the battery-operation time and reducing the size of mobile units.

[Features]


1. Low DC resistance (DCR) value, by improving the wire space factor with ribbon wire and our original wire winding method DC resistance value: 130 m (about 20% reduction compared with our current models (2) … top level in the industry (1) IDC characteristics: 0.95A (about 25% improvement compared with our current models (*2) 2. Small and thin Dimensions: L 3.2 mm × W 3.2 mm × H 1.2 mm 3. Magnetic shield-effect, by adopting the adhesive construction including the magnetic materials Leakage flux: 1.0 mT (milli terrace) in horizontal direction

1. Low DC resistance (DCR) value, by improving the wire space factor with ribbon wire and our original wire winding method

DC resistance value: 130 m

(about 20% reduction compared with our current models (*2) … top level in the industry (*1)

IDC characteristics: 0.95A (about 25% improvement compared with our current models (*2)

2. Small and thin

Dimensions: L 3.2 mm × W 3.2 mm × H 1.2 mm

3. Magnetic shield-effect, by adopting the adhesive construction including the magnetic materials

Leakage flux: 1.0 mT (milli terrace) in horizontal direction

(*1)	Our investigation of the tip-type choke coil with the dimension of L 3.2mm×W 3.2mm×H1.2mm, and 4.7μH, as of June 10, 2009
(*2)	Compared with our current models (tip-type choke coil ELLVFG type) with the dimension of L 3.2 mm×W 3.2mm×H 1.2mm, and 4.7μH

[Applications]

DC/DC converter circuits of mobile phones, Digital still-cameras, Hard-disc drivers etc.

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