BQ25570 Thermal/Solar Energy Harvester with 30F Super capacitors
The device is 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.
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Thermal or energy harvesting battery charger w/ additional buck converter
The device is 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, 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. Output voltage from this converter is set at 3.3V.
Ultra Low Power DC-DC Boost Charger
Cold-start Voltage: VIN ≥ 330 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
Energy can be Stored to Re-chargeable Li-ion Battery, Super- capacitors or Conventional Capacitors
Battery Charging and Protection
Internally Set Undervoltage 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%
Peak Output Current up to 110 mA
Programmable Maximum Power Point Tracking (MPPT)
Provides Optimal Energy Extraction From a Variety of Energy Harvesters including Solar Panels, Thermal and Piezo Electric Generators
Settings calculator and schematic can be found on my Github.
On the board there are two 30 Farad 2.7V super capacitors.
Dimensions of the board are: 44mm x 44mm