A 96.7% efficient boost converter with a stand-by current of 420 nA for energy harvesting applications

This paper presents a voltage hysteresis controlled boost converter working in boundary mode for low power energy harvesting applications. Efficiencies up to 96.7% are reached. A flipped voltage follower based OTA-C integrator ensures current control with a static current consumption of 8.2 μA in the active phase and 420 nA in the standby phase. The boost converter can handle input voltages down to 0.9 V. The output voltage is adjustable from 1.3 V up to the technology limit of 3.3 V. The boost converter uses an external commercially available coil of 680 μH and operates at switching frequencies around 150 kHz. The circuit is realized in a 0.35 μm technology.