توضیحات
Description
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 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
1. 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 (typical)
Ship Mode with < 5 nA From Battery
2. Energy Storage
Energy can be Stored to Re-chargeable Li-ion Batteries, Thin-film Batteries, Super-
capacitors, or Conventional Capacitors
3. Battery Charging and Protection
Internally Set Undervoltage Level
User Programmable Overvoltage Levels
4. 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
5. Programmable Step Down Regulated Output (Buck)
High Efficiency up to 93%
Supports Peak Output Current up to 110 mA (typical)
6. Programmable Maximum Power Point Tracking (MPPT)
Provides Optimal Energy Extraction From a Variety of Energy Harvesters including Solar Panels, Thermal and Piezo Electric Generators
Applications
Energy Harvesting
Solar Chargers
Thermal Electric Generator (TEG) Harvesting
Wireless Sensor Networks (WSN)
Low Power Wireless Monitoring
Environmental Monitoring
Bridge and Structural Health Monitoring (SHM)
Smart Building Controls
Portable and Wearable Health Devices
Entertainment System Remote Controls
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