Planar inductors for high frequency DC-DC converters using microwave magnetic material

Christian Martin (1) , Bruno Allard (1) , Dominique Tournier (1) , Maher Soueidan (2) , Jean-Jacques Rousseau (3) , D. Allessem (3) , Ludovic Ménager (1, 4) , Vincent Bley (5) , Yves Lembeye (6)

1 AMPERE - Ampère
2 LMI - Laboratoire des Multimatériaux et Interfaces
3 DIOM - Dispositifs et Instrumentation en Optoélectronique et micro-ondes
4 INRETS/LTN - Laboratoire des Technologies Nouvelles
5 LAPLACE-MDCE - Matériaux Diélectriques dans la Conversion d’Energie
6 G2ELab - Laboratoire de Génie Electrique de Grenoble

Paper presents simulation and primary experimental results about the fabrication of planar inductances for monolithic DC/DC converters in System-In-Package environment. A microwave magnetic material (YIG) and electroplated copper winding are proposed. A low-cost manufacturing process is proposed that uses dry film instead of UV SU8 resin. Literature details similar manufacturing processes but the proposed magnetic material enables to operate in the 100 MHz range. Simulation results based on HFSS and Flux2D simulators present the sensitivity of the inductor to geometrical parameters. Samples have been fabricated for a 1 W, Vin = 3.6 V, Vout = 1 V converter and a switching frequency above 100 MHz. An optimized 25 nH inductor with expected 50 m Omega RDC, 3 mm2 has been designed. Primary results indicate that the nH/(m Omega.mm2) metric is promising and truly comparable to already published results.

Domaines: Energie électrique

Christian Martin, Bruno Allard, Dominique Tournier, Maher Soueidan, Jean-Jacques Rousseau, et al.. Planar inductors for high frequency DC-DC converters using microwave magnetic material. ECCE, Sep 2009, San José, CA, United States. pp.1890 - 1894, ⟨10.1109/ECCE.2009.5316363⟩. ⟨hal-00618646⟩