MISIMO: A Multi-Input Single-Inductor Multi-Output Energy Harvesting Platform in 28-nm FDSOI for Powering Net-Zero-Energy Systems

This paper presents a power management unit that meets the need of small-form-factor net-zero energy systems by aggregating the maximum available power from three different energy sources while simultaneously regulating three output power rails over a wide dynamic load range, while also managing the charging and discharging of a battery, all in a single-stage single-inductor converter. The proposed architecture uses hysteresis control to regulate the voltage of each harvester at their respective maximum power points (MPPs) using pulse-frequency modulation (PFM) and adaptive inductor ON-time, all via a low-power event-driven controller. The converter, fabricated in 28-nm fully-depleted silicon-on-insulator (FDSOI), achieves a peak efficiency of 89% and supports an output power range from <inline-formula> <tex-math notation="LaTeX">$1~\mu \text{W}$ </tex-math></inline-formula> to 60 mW with efficiency >75% at <inline-formula> <tex-math notation="LaTeX">$V_{\text {out}}=1$ </tex-math></inline-formula> V and >69% at <inline-formula> <tex-math notation="LaTeX">$V_{\text {out}}=0.6-0.9$ </tex-math></inline-formula> V, all with a quiescent power of only 262 nW.

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