Abstract
This paper presents an efficient power management unit (PMU) that supports μWatt load range for TEG-based applications. The PMU consists of an inductor-based DC-DC converter that boosts a small TEG voltage and followed by two switched capacitor-based buck converters which are used to drive a μWatt-SoC. The PMU generates a regulated 1.1V and 0.6V output voltages. Pulse frequency modulation scheme is utilized to regulate the output voltages. SPICE simulation results in 65nm CMOS technology show that the maximum end-to-end efficiency of the PMU is 68% at an output power of 62μWatt. The PMU occupies an area of less than 0.9mm2. The switched capacitor circuit enables the usage of dynamic voltage scaling (DVS) that helps the PMU to operate in ultra-low power modes.
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