BQ25570

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

Diagrams

Functional diagram

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

Parametrics

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

Companion Products

Technical Documents

Datasheet (1)

Application notes (1)

User guides (1)

Selection guides (1)

Solution guides (1)

More literature (2)

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