A Hybrid Converter with Dual Outputs for Low Cross Regulation and Improved Current Balance

The discontinuous energy transfer characteristics of traditional single-inductor dual-output converters can lead to large output voltage ripple and cross-regulation. Thus, this paper presents a double step-down dual-output (DSD-DO) converter implemented in a 0.15 μm BCD process, adopting hybrid sum and deviation (HSD) control to achieve a small output voltage ripple of 25mV and minimize cross-regulation to 0.025mV/mA. The timing balance mechanism (TBM) generates the replicated on-time and calibrates by sensing inductor current mismatch, which improves current balance by 90%. The proposed pulse-based highly robust high-speed low stress level shifter (H 2 L) enhances transition speed during load transients while reducing the voltage stress on low voltage device.