New highly efficient power inductors

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8 August 2007 Passive Components

Pulse has released a new series of flat-coil surface mount (SMT) power inductors ideal for use in voltage regulator modules (VRMs) in notebook computers, desktop computers, workstations, and servers as well as in DC/DC point-of-load (POL) converters and other high-density, high-power, high-ambient-temperature applications.

The patent pending PG0437NL series consists of four parts, with inductance values from 0,32 to 0,6 μH with a peak saturation of 39 A. These inductors use a power ferrite core material which results in 10 times lower core losses than iron powder or iron alloy cores while maintaining the same saturation current as 4040 iron powder inductors. A lower core loss significantly reduces the inductor temperature, increases efficiency and, as a result, extends battery operating time. Evaluation of a notebook computer's performance, using BAPCO MobileMark 2005 software, shows an average lower operating temperature of 5°C and 6% more battery operating time when using the PG0437NL inductor instead of an iron powder inductor. In addition, ferrite cores, unlike iron powder material cores, are not subject to thermal ageing. Thus, they decrease any risk of thermal runaway when operating at high ambient temperatures and high output current loads.

A special process of winding the rectangular wires results in a DCR of 0,85 mΩ, which on average is 30% lower than what existing inductors are currently offering. A decrease in DCR reduces copper loss (I²R) and helps to increase overall system efficiency. The series also offers a tight DCR tolerance of ±10%, ideal for current sensing applications. The series has a high peak saturation current from 21 A to 39 A and a maximum operating current rating of 33 A. This current rating enables the inductors to handle the high-current requirements of microprocessors with a significant saturation margin.

These inductors come in an industry-standard 4040 footprint of 12,5 mm x 11 mm max with a low profile of 4,5 mm max, important for allowing even airflow over the entire circuit board to reduce hot spots. They have an operating temperature of -40 to +130°C and are RoHS compliant and meet standard EIA481 requirements.

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