Maxim Integrated recently acquired Volterra Semiconductor， which now allows a much wider customer base to use benefits of coupled inductors in different applications. Coupled inductors are often used in multiphase topologies to take advantage of the current-ripple cancellation from magnetic coupling between the phases. Normally， current-ripple cancellation happens only at the output of the multiphase buck converter when typical discrete inductors are used. When these inductors are magnetically coupled， the current-ripple cancellation is applied to all elements of the circuit： MOSFETs， inductor windings， PCB traces.1-6 Thus， the switching from all the phases affects each single phase， so the current ripple is reduced in amplitude and multiplied in frequency. Reduction in the RMS of the waveforms can improve the efficiency of the power converter or be traded for smaller magnetics， faster transient and， therefore， smaller output capacitance.