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 article presents a double step-down dual-output converter implemented in a 0.15 μm bipolar-CMOS-DMOS (BCD) process, adopting hybrid sum and deviation control to achieve a small output voltage ripple of 25 mV and minimize cross-regulation to 0.025 mV/mA. The timing balance mechanism 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 enhances transition speed during load transients while reducing the voltage stress on low voltage device.