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BQ25505

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Ultra low power harvester power management IC with boost charger, and autonomous power multiplexor

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Data sheet

BQ25505

ACTIVE
Data sheet Order now

Product details

Rating Catalog Number of series cells 1 Cell chemistry Li-Ion/Li-Polymer, SuperCap Charge current (max) (A) 0.1 Features Input OVP, Solar input/MPPT Vin (min) (V) 0.6 Vin (max) (V) 5.1 Absolute max Vin (max) (V) 5.5 Control topology Switch-Mode Boost Battery charge voltage (min) (V) 2.2 Battery charge voltage (max) (V) 5.5 Control interface Standalone (RC-Settable) Operating temperature range (°C) -40 to 125
Rating Catalog Number of series cells 1 Cell chemistry Li-Ion/Li-Polymer, SuperCap Charge current (max) (A) 0.1 Features Input OVP, Solar input/MPPT Vin (min) (V) 0.6 Vin (max) (V) 5.1 Absolute max Vin (max) (V) 5.5 Control topology Switch-Mode Boost Battery charge voltage (min) (V) 2.2 Battery charge voltage (max) (V) 5.5 Control interface Standalone (RC-Settable) Operating temperature range (°C) -40 to 125
VQFN (RGR) 20 12.25 mm² (3.5 mm × 3.5 mm)
  • 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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Top documentation Type Title Format options Date
* Data sheet bq25505 ultra low-power boost charger with battery management and autonomous power multiplexer for primary battery in energy harvester applications datasheet (Rev. F) PDF | HTML Mar 6, 2019
Technical article Experience seamless shopping thanks to electronic shelf labels PDF | HTML Oct 10, 2018
Technical article How energy harvesting can extend the life of your fault indicator on the grid PDF | HTML Oct 18, 2017
White paper Cities grow smarter through innovative semiconductor technologies Jul 7, 2017
User guide User's Guide for bq25505 Battery Charger Evaluation Module for Energy Harvesting (Rev. A) Aug 23, 2014
Product overview Battery Management Solutions for Wearable and Fitness Devices (Rev. C) Aug 18, 2014
Analog design Journal Accurately measuring efficiency of ultralow-IQ devices Jan 22, 2014
Product overview Industry’s Most Efficient Nano Power Harvesting Solutions (Rev. A) Nov 8, 2013

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
Calculation tool

SLUC484 — bq25505/70 Design Help V1.3

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Reference design

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The Indoor Light Energy Harvesting Reference Design for Bluetooth Low Energy (BLE) Beacon Subsystem provides a solution where by with just the power of the typical indoor lighting in a retail environment (greater than 250 LUX) the Bluetooth Low Energy chip can broadcast BLE beacons.

This subsystem (...)

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Reference design

TIDA-00488 — Energy Harvesting Ambient Light and Environment Sensor Node for Sub-1GHz Networks Reference Design

TIDA-00488 demonstrates an ultra-low power and a renewable method of wireless environmental sensing using daylight energy harvesting with a long backup battery life. This reference design uses our ultra-low power harvester power management SimpleLink™ ultra-low power sub-1 GHz wireless (...)

Supported products & hardware
Reference design

TIDA-00998 — Energy Harvesting and Fault Indicator Subsystem for Overhead Fault Indicators Reference Design

This reference design shows multiple architectures for extending primary battery life using a secondary battery or supercapacitor with energy harvested from a current transformer (CT) or solar cells. Optimal power management is done using efficient LED drivers to drive series or parallel (...)
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VQFN (RGR) 20 Ultra Librarian
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