Flat-coil surface mount inductors have low DCR

1 November 2006 Passive Components

Pulse has introduced a series of flat-coil, power inductors with low direct current resistance (DCR) and high saturation current in a low-profile, self-leaded, surface mount package. The PG0426NL series is claimed to have the lowest DCR of any inductors of this size and profile and uses an advanced core material that resists thermal ageing up to 150°C.

Pulse's PG0426NL series has a high peak saturation current of 60 A and a maximum operating current rating of 34,5 A that enables the inductors to handle the high current requirements of microprocessors with significant saturation margin. The DCR of 11,8 mΩ down to 1,5 mΩ results in lower copper losses and maximises the current rating for higher component performance and system efficiency. Inductance values for this series range from 1,5 μH down to 0,1 μH.

A key advantage of this PG0426NL series is the use of an advanced core material that can operate at high temperatures without any core deterioration or an increase in core loss.

Pulse's flat-coil inductor windings are made of rectangular copper (flat wire) wound helically, similar to a spring. The rectangular copper wire has a larger surface area than round wire, resulting in reduced skin effect losses and less DC resistance in a lower profile volume. The rectangular wire winding also provides a self-terminating lead (no internal solder joints) to increase reliability and reduce cost.

The inductors come in an industry-standard 2525 footprint of 7,5 x 7,0 mm max (6,9 x 6,5 mm nominal) with a low profile of 3,2 mm.

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