Product details

Number of series cells 1 Charge current (max) (A) 0.1 Vin (max) (V) 5.1 Cell chemistry Li-Ion/Li-Polymer, SuperCap Battery charge voltage (min) (V) 2.2 Battery charge voltage (max) (V) 5.5 Absolute max Vin (max) (V) 5.5 Control topology Switch-Mode Boost Control interface Standalone (RC-Settable) Features Input OVP, Solar input/MPPT Vin (min) (V) 0.6 Rating Catalog Operating temperature range (°C) -40 to 125
Number of series cells 1 Charge current (max) (A) 0.1 Vin (max) (V) 5.1 Cell chemistry Li-Ion/Li-Polymer, SuperCap Battery charge voltage (min) (V) 2.2 Battery charge voltage (max) (V) 5.5 Absolute max Vin (max) (V) 5.5 Control topology Switch-Mode Boost Control interface Standalone (RC-Settable) Features Input OVP, Solar input/MPPT Vin (min) (V) 0.6 Rating Catalog Operating temperature range (°C) -40 to 125
VQFN (RGR) 20 12.25 mm² 3.5 x 3.5
  • Ultra Low-Power With High-Efficiency DC-DC Boost Charger
    • Cold-Start Voltage: VIN ≥ 600 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
  • Ultra Low-Power With High-Efficiency DC-DC Boost Charger
    • Cold-Start Voltage: VIN ≥ 600 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

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.

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.

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Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Code example or demo

SLUC463 Solar App Design Example V1.3, bq25505

Supported products & hardware

Supported products & hardware

Products
Battery charger ICs
BQ25505 Ultra low power harvester power management IC with boost charger, and autonomous power multiplexor
Calculation tool

SLUC484 bq25505/70 Design Help V1.3

Supported products & hardware

Supported products & hardware

Products
Battery charger ICs
BQ25505 Ultra low power harvester power management IC with boost charger, and autonomous power multiplexor BQ25570 Ultra Low power Harvester power Management IC with boost charger, and Nanopower Buck Converter
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Schematic: PDF
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VQFN (RGR) 20 Ultra Librarian

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