Traditional power delivery networks (PDN) to ASICs have a bandwidth that extends to about 100 kHz such that these PDNs respond with adequate speed and meet performance specifications if the transient load current changes at a rate slower than 100 kHz. As ASICs become more computationally powerful, not only does their current consumption go up, their current transients undergo relatively rapid slew, e.g., with a bandwidth exceeding 10 MHz. The bandwidth mismatch between the PDN and the current demand of the ASIC causes a substantial loss in efficiency.

This disclosure describes a PDN comprising an ensemble of three or more power supplies optimized to differing frequency ranges. A power supply from the ensemble automatically kicks in when transient currents arise with a bandwidth that includes the frequency range of the power supply. Power is delivered across the entire ASIC bandwidth at optimal efficiency and with excellent transient response.

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