Design of a Novel Voltage Regulator Module (VRM) with Fast Transient Response

In this paper, a new circuit of power supply for microprocessors, named as switched-inductor multiphase voltage regulator module (VRM), is presented and designed. One of the main requirements of VRMs for today’s microprocessors is fast transient response. The other issues associated with conventional VRMs are small duty ratio, large ripple and low efficiency. A solution to the limitations of these VRMs is presented in the form of a new VRM topology which is obtained from the multiphase interleaving VRM by the addition of a capacitor and introduction of a second inductor in each phase. The proposed VRM has the advantage of extending the duty ratio, decreasing the peak-topeak ripple and a very fast load transient response. Both theoretical and simulation results shows that the performance of the proposed VRM is better than the conventional VRMs. The proposed VRM operates with double duty ratio and has fast transient response, small ripple and reduced voltage stress on switches, which improves efficiency.