Mobility

An Integrated Four-Phase Buck Converter Delivering 1A/mm2 With 700ps Controller Delay and Network-on-Chip Load in 45-Nm SOI

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Executive Summary

Performance-per-watt is an increasingly important metric for microprocessors as it is now common for the thermal envelope to limit computational performance of an IC. Dynamic Voltage and Frequency Scaling (DVFS) can improve performance-per-watt by reducing wasted power when logic is idling or performing a low priority task. The benefits of DVFS are best realized when implemented with high granularity of voltage and frequency domains, for example, individually optimizing the power consumption of each core in a many-core processor according to workload. Unfortunately, conventional switched - inductor board level Voltage Regulator Modules (VRMs) are poorly suited for such a granular implementation because of the need to distribute many supplies from board to chip.

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