Inductors Allow Loss-Less Current Sensing in Multiphase DC-DC Converters

摘要

High performance microprocessors require a low-voltage, high-current power supply with fast transient response. Therefore, interleaved multiphase synchronous buck converters have gained popularity as the VRM for these microprocessors. Multiphase converters must share load current to balance thermal stress on each phase, so it's important to address current sensing and sharing. You can use the current signal in adaptive voltage positioning to reduce the output voltage deviation during transients, which requires accurate current information.