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In this paper a new fast-response voltage regulator module (VRM) design is presented that will meet the requirements and features of the new generation of microprocessors and digital systems. It is ab...le to produce high slew rate of load current and capability to keep constant the output voltage in case of severe load changes. The proposed fast-response, LC clamp topology is theoretically lossless and is able to produce high slew rate of output current. It is low cost and easy to implement with simple control scheme. This is modified from a basic buck topology by replacing the output inductor with two magnetically coupled inductors in different inductance value. The inductor with small inductance will take over the output inductor during step-up load transient. It speeds up the output current slew rate and reduces the output voltage drop during step-up load transient. The additional capacitor, which is connected in parallel to the coupled inductor, will suppress the over-shoot of output voltage during the step-down load transition. In steady state, the inductor with large inductance takes over the output inductor and keeps the substantially small ripple current. The design, simulation and experimental results are presented to verify the proposed topology.show more
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