An On-Chip Dual-Output Switched-Capacitor DC-DC Converter with Fine-Grained Output Control

This paper presents a fully integrated dual-output switched-capacitor DC-DC converter with dynamic four-phase operation. The presented converter is derived from an existing topology known as the algorithmic voltage-feed-in and it maintains the voltage conversion ratio (VCR) reconfiguration capability of the original topology. By using a selective pair of VCRs, the presented converter generates two output voltages with an arbitrary ratio with high efficiency. Additionally, efficiency is maintained for various combinations of load currents via dynamic phase skipping and frequency modulation. A test chip fabricated using a 0.18 mu m CMOS process exhibits conversion efficiencies higher than 89% for all VCR combinations with a 0.5 mA load current.