Ultra Low Power Harvester Power Management IC with Boost Charger, and Autonomous Power Multiplexor - BQ25505

BQ25505 (ACTIVE)

Ultra Low Power Harvester Power Management IC with Boost Charger, and Autonomous Power Multiplexor

 

Description

The bq25505 device is specifically designed to efficiently extract the microwatts (µW) to miliwatts (mW) of power generated from a variety of DC energy harvesting, high-impedance sources like photovoltaic (solar) or thermal electric generators (TEGs) without collapsing those sources. The battery-management features of the bq25505 ensure that a secondary rechargeable battery is not overcharged by this extracted power, with voltage boosted, nor depleted beyond safe limits by a system load. The integrated multiplexer gate drivers autonomously switch the system load to a primary nonrechargeable battery if the secondary battery voltage falls below the user-defined VBAT_OK threshold.

Features

  • Ultra Low-Power With High-Efficiency DC-DC
    Boost Charger
    • Cold-Start Voltage: VIN ≥ 330 mV
    • Continuous Energy Harvesting From Input
      Sources as Low as 100 mV
    • Ultra-Low Quiescent Current of 325 nA
    • Input Voltage Regulation Prevents Collapsing
      High-Impedance Input Sources
    • Ship Mode With < 5 nA From Battery
  • Energy Storage
    • Energy can be Stored to Rechargeable Li-Ion
      Batteries, Thin-Film Batteries, Super-Capacitors,
      or Conventional Capacitors
  • Battery Charging and Protection
    • Internally Set Undervoltage Level
    • User-Programmable Overvoltage Level
  • 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 Maximum Power Point Tracking
    (MPPT)
    • Integrated MPPT for Optimal Energy
      Extraction From a Variety of Energy
      Harvesters
  • Gate Drivers for Primary (Nonrechargeable) and
    Secondary (Rechargeable) Storage Element
    Multiplexing
    • Autonomous Switching Based on VBAT_OK
    • Break-Before-Make Prevents System Rail
      Droop

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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
BQ25505
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