Miniature Transformers Serve Energy Harvesting Applications

October 29, 2013. Coilcraft’s new 6 x 6-mm LPR6235 Series coupled inductors can be used as step-up or flyback transformers in DC/DC converters or as autotransformers. They are suitable for voltage step-up in energy-harvesting applications and have been selected by Linear Technology for its LTC3108 and LTC3109 ultralow voltage step-up converter and power managers.

These compact, shielded parts measure 6 mm square by 3.5 mm high. They feature a coupling coefficient of k = 0.95 and are available with five turns ratios from 1:10 to 1:100 for a variety of voltage step-up and step-down applications. They offer 300-V winding-to-winding isolation. Coilcraft also offers a smaller LPR4012 Series transformer that measures 4 mm square by 1.1 mm high.

Both versions are RoHS compliant and offer a maximum reflow temperature of 260°C. They feature silver-palladium-platinum-glass frit terminations. COTS Plus tin-silver-copper and tin-lead terminations are also available.

Free evaluation samples and complete technical specifications are available online at and, respectively.

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