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 mu A 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 mu H and operates at switching frequencies around 150 kHz. The circuit is realized in a 0.35 mu m technology.