The importance of energy-constrained processors continues to grow especially for\nultra-portable sensor-based platforms for the Internet-of-Things (IoT). Processors for these IoT\napplications primarily operate at near-threshold (NT) voltages and have multiple power modes.\nAchieving high conversion efficiency within the DCââ?¬â??DC converter that supplies these processors is\ncritical since energy consumption of the DCââ?¬â??DC/processor system is proportional to the DCââ?¬â??DC\nconverter efficiency. The DCââ?¬â??DC converter must maintain high efficiency over a large load range\ngenerated from the multiple power modes of the processor. This paper presents a fully integrated\nstep-down self-oscillating switched-capacitor DCââ?¬â??DC converter that is capable of meeting these\nchallenges. The area of the converter is 0.0104 mm2 and is designed in 28 nm ultra-thin body\nand buried oxide fully-depleted SOI (UTBB FD-SOI). Back-gate biasing within FD-SOI is utilized\nto increase the load power range of the converter. With an input of 1 V and output of 460 mV,\nmeasurements of the converter show a minimum efficiency of 75% for 79 nW to 200 Ã?¼W loads.\nMeasurements with an off-chip NT processor load show efficiency up to 86%. The converterââ?¬â?¢s large\nload power range and high efficiency make it an excellent fit for energy-constrained processors
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