A fully integrated, wide-load-range, high-power-conversion-efficiency switched capacitor DC–DC converter with adaptive bias comparator for ultra-low-power power management integrated circuit

Abstract

In this paper, we present a wide-load-range switched-capacitor DC-DC buck converter with an adaptive bias comparator for ultra-low-power power management integrated circuit. The proposed converter is based on a conventional one and modified to operate in a wide load range by developing a load current monitor used in an adaptive bias comparator. Measurement results demonstrated that our proposed converter generates a 1.0 V output voltage from a 3.0 V input voltage at a load of up to 100 µA, which is 20 times higher than that of the conventional one. The power conversion efficiency was higher than 60% in the load range from 0.8 to 100 µA.

Design of Switched-Capacitor Voltage Boost Converter for Low-Voltage and Low-Power Energy Harvesting Systems

“…This causes the output voltage to reduce and degrades the power conversion efficiency (PCE). A complementary circuit configuration is often adopted to cope with this problem [31]- [34]. Figure 3 (a) shows a schematic of the complementary circuit configuration including a load capacitor C L .…”

Ultra-low power low-dropout linear regulator with a load current tracking bias current generator for loT devices

“…Internet-of-things (IoT) devices need to be small, low-cost, maintenance-free, and ultra-low power. [1][2][3][4][5][6][7][8][9][10][11] Energy harvesting has attracted attention as an alternative power source of batteries. [12][13][14][15][16][17][18][19][20][21][22][23][24] However, the output voltage and power of small energy harvesters are basically weak and easily lost, while the operating voltage of IoT devices will be 1.2 V or higher and the current consumption in IoT devices will be in the ranges from several nA to several hundred μA.…”

Fully-integrated switched-capacitor voltage boost converter with digital maximum power point tracking for low-voltage energy harvesting

“…Internet-of-things (IoT) devices must be small, low-cost, maintenance-free, and operate at ultra-low power. [1][2][3][4][5][6][7][8][9][10][11] Energy harvesting has attracted attention as an alternative energy source for such devices, instead of using small chemical batteries. 12,13) Among the several harvesters, photovoltaic (PV) cells are some of the most common and practical ones because they can generate electricity from surrounding ambient light, not only sunshine but also indoor light.…”