2014 R&D 100 Winner
Texas Instruments' bq25570 is a new, highly integrated energy-harvesting nanopower management solution that meets the needs of ultra-low power applications. Energy harvester design is tricky; it’s important that power management electronics consume the lowest amount of power to maximize efficiency. Until now, all energy harvesting and power management integrated circuits (IC) either offered a reduced feature set (to minimize power consumption) or offered additional features by sacrificing the power consumption. The bq25570 is the first device of its kind to implement a highly efficient boost charger with a nano-powered buck converter to efficiently acquire and manage the microwatts to milliwatts of power generated from a variety of DC sources like photovoltaic (solar) or thermal electric generators.
Targeted toward systems such as wireless sensor networks (WSN), which have stringent power and operational demands, the bq25570 features a small footprint 20-lead 3.5-mm-by-3.5-mm QFN package, and is designed with a DC/DC boost converter/charger requiring only microwatts of power to begin operating. The boost charger can start with an input voltage as low as 330 mV, and once started, continues to harvest energy down to an input voltage of 100 mV. The bq25570 also implements a programmable maximum power point tracking sampling network to optimize the transfer of power into the device and provides an externally programmable regulated supply via the buck converter. The regulated output is optimized to provide high efficiency across low output currents (< 10 µA) to high currents (110 mA).
The bq25570 Development Team from Texas Instruments