A Quad-Output Elastic Switched Capacitor Converter and Per-Core LDO with 87% Power Efficiency and 2.5× Core-Frequency Range Improvement.

A quad-output elastic switched capacitor converter with four cores and per-core digital low dropout regulators (LDOs) is designed in 130nm CMOS. This design routes power on demand by sharing the total switching capacitance network across all the cores and delivering power to each core in a time interleaved manner. As the current demand of a core increases, more switching capacitance and switch area resources are automatically allotted to the core. In case of further power demand, if the power delivery module can no longer allocate further resources, then it autonomously changes the voltage conversion ratio till the demand is met. Measurements reveal 87% peak power efficiency and 2.5× increase in core-frequency range, thus enabling wider dynamic voltage and frequency scaling (DVFS).