The bq25570 device is specifically designed to efficiently extract microwatts (µW) to
milliwatts (mW) of power generated from a variety of high output impedance DC sources like
photovoltaic (solar) or thermal electric generators (TEG) without collapsing those sources. The
battery management features ensure that a rechargeable battery is not overcharged by this extracted
power, with voltage boosted, or depleted beyond safe limits by a system load. In addition to the
highly efficient boosting charger, the bq25570 integrates a highly efficient, nano- power buck
converter for providing a second power rail to systems such as wireless sensor networks (WSN) which
have stringent power and operational demands. All the capabilities of bq25570 are packed into a
small foot-print 20-lead 3.5-mm x 3.5-mm QFN package (RGR).