he BQ25570 Boost Converter 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 Loads 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).

Features:

• Ultra Low Power DC-DC Boost Charger
  • Cold-Start Voltage: VIN ≥ 600 mV
  • Continuous Energy Harvesting From VIN as low as 100 mV
  • Input Voltage Regulation Prevents Collapsing
  • High Impedance Input Sources
  • Full Operating Quiescent Current of 488 nA (typical)
  • Ship Mode with < 5>
• Energy Storage
  • Energy can be Stored to Re-chargeable Li-ion
  • Batteries, Thin-film Batteries, Supercapacitors, or Conventional Capacitors
• Battery Charging and Protection
  • Internally Set Under-voltage Level
  • User Programmable Overvoltage Levels
• Battery Good Output Flag
  • Programmable Threshold and Hysteresis
  • Warn Attached Microcontrollers of Pending Loss of Power
  • Can be Used to Enable or Disable System Loads
• Programmable Step Down Regulated Output (Buck)
  • High Efficiency up to 93%
  • Supports Peak Output Current up to 110 mA (typical)
• Programmable Maximum Power Point Tracking (MPPT)
  • Provides Optimal Energy Extraction From a
  • Variety of Energy Harvesters including Solar Panels, Thermal and Piezo Electric Generators