A Single-Inductor Dual-Output DC-DC Converter with Dual-Mode Control

This paper demonstrates a single-inductor dual-output (SIDO) buck converter, which is developed for implantable medical devices. The dual-mode operation, which combines pulse-skip modulation (PSM) and pulse-width modulation (PWM), is employed to regulate outputs under light load and heavy load conditions, respectively. The converter provides two output voltages: VOUT1 (2.5–3V) for charge pumps and VOUT2 (2V) for digital circuits. With the start-up circuits, the SIDO buck converter can act as self-start-up DC–DC buck converter. To avoid voltage stress issue under 3.2–4.2V battery operation in 180nm standard (CMOS) process, the stacked power stage is used. The proposed level shifter includes an additional level restorer to avoid a misjudgment issue during start-up period. The simulation results demonstrate that the converter achieves peak efficiency of 94.5% with PSM control, and it achieves peak efficiency of 89.1% with PWM control.

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