BQ25570 (ACTIVE)

Ultra Low Power Harvester Power Management IC with Boost Charger, and Nanopower Buck Converter

Ultra Low Power Harvester Power Management IC with Boost Charger, and Nanopower Buck Converter - BQ25570
 

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 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 × 3.5-mm QFN package (RGR).

Features

  • 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
  • Energy Storage
    • Energy can be Stored to Re-chargeable
      Li-ion Batteries, Thin-film Batteries, 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%
    • 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

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Parametrics Compare all products in Energy Harvesting & Solar Charging

 
Cell Chemistry
Charge Current (Max) (A)
Control Topology
Primary Charge Termination Method
Number of Series Cells
Battery Charge Voltage (V)
Features
Operating Temperature Range (C)
Pin/Package
BQ25570
Li-Ion
SuperCap
Lead Acid
LiFePO4
NiMH
Li-Polymer
NiCd   
0.1   
Switch-Mode   
Voltage   
Single Cell   
Adjustable   
Integrated FET
Over Voltage Protection
Solar Input
Under Voltage Protection   
-40 to 125   
20VQFN