Load Transient Boost Applied to Multiphase DC-DC Converters

摘要

Recently, there has been a huge increase of current rate drawn by new Intel and AMD processors. Multimedia applications, dual core architecture and electrical performances of 65nm node make it more and more difficult to control the core voltage during load transients. 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 because they allow faster system control in small signal condition, reduce output voltage ripple and decrease cost of input and output capacitors. However, interleaving phase shift during large and steep load transients can negatively affect output voltage.