Abstract
With the aim of providing designer guidelines for choosing the most suitable solution, according to the given design specifications, in this paper a review of charge pump (CP) topologies for the power management of Internet of Things (IoT) nodes is presented. Power management of IoT nodes represents a challenging task, especially when the output of the energy harvester is in the order of few hundreds of millivolts. In these applications, the power management section can be profitably implemented, exploiting CPs. Indeed, presently, many different CP topologies have been presented in literature. Finally, a data-driven comparison is also provided, allowing for quantitative insight into the state-of-the-art of integrated CPs.
Highlights
The Internet of Things (IoT) paradigm is expected to have a pervasive impact in the years
In order to further strengthen the knowledge about these important circuital blocks, this paper is aimed at reviewing the state-of-the-art review of integrated charge pump (CP), focusing on IoT applications, where the main constraints are area and power conversion efficiency
Charge pumps fall into the class of the inductor-less DC-DC converters
Summary
The Internet of Things (IoT) paradigm is expected to have a pervasive impact in the years. CPs are widely used to adapt the voltage levels between two or more functional blocks and to convey the electric energy, Electronics 2019, 8, 480; doi:10.3390/electronics8050480 www.mdpi.com/journal/electronics and, more recently, IoT nodes [1,2,3,4,12,13,14,15,16,17,18,19,20,21,22,23] In this latter context, the design of a PMIC based on CPs is a challenging task since it must fulfill a very low input voltage supply (few hundreds of millivolts and high-power conversion efficiency). In order to further strengthen the knowledge about these important circuital blocks, this paper is aimed at reviewing the state-of-the-art review of integrated CPs, focusing on IoT applications, where the main constraints are area and power conversion efficiency.
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