1,2 mm high compact wire-wound power inductors have 50% smaller footprint

18 April 2007 Power Electronics / Power Management

Taiyo Yuden's BRL2518 series of wire-wound power inductors measure just 2,5 x 1,8 mm with a 1,2 mm maximum height. The five models in the series offer a superior combination of low DC resistance (0,8 to 0,4 Ω), high inductance (1,0 to 4,7 μH) and high current ratings (1,6 to 0,7 A).

Continuing miniaturisation requires more compact, high-efficiency DC-DC converters to maximise battery power. Designing smaller converters hinges on reducing the size of the choke coil, its main and largest component. However, reducing the size of the wire-wound inductor (functioning as a choke coil to prevent or limit AC while allowing DC to flow) increases resistance and reduces the efficiency of the DC-DC converter. For this reason, it is very difficult to reduce the size of an inductor while maintaining the lower-resistance characteristics of larger components.

By improving the traditional round drum/sleeve core technology used, Taiyo Yuden developed a unique sleeveless square-core winding that successfully eliminates all wasted space. The thickened lead wire inside the inductor achieves the lowest possible DC resistance. The result is a compact, high-efficiency choke coil reducing surface area by half compared to conventional inductors, while providing a minimal level of DC resistance. This series facilitates more compact DC-DC converters and thinner-profile product designs.

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