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

BQ25505

ACTIVE
Data sheet Order now

Product details

Parameters

Number of series cells 1 Charge current (Max) (A) 0.1 Operating 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 Vin (safety rating) (Max) ((V)) 5.5 Control interface Standalone (RC-Settable) Features Input OVP, Solar input/MPPT Operating Vin (Min) (V) 0.6 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

VQFN (RGR) 20 12 mm² 3.5 x 3.5 open-in-new Find other Battery charger ICs

Features

  • 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
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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.

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Technical documentation

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Type Title 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) Mar. 06, 2019
Technical article When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical article Experience seamless shopping thanks to electronic shelf labels Oct. 10, 2018
Technical article How energy harvesting can extend the life of your fault indicator on the grid Oct. 18, 2017
White paper Cities grow smarter through innovative semiconductor technologies Jul. 07, 2017
Technical article Should I use a linear charger or a switching charger? Oct. 31, 2015
User guide User's Guide for bq25505 Battery Charger Evaluation Module for Energy Harvesting (Rev. A) Aug. 23, 2014
More literature Battery Management Solutions for Wearable and Fitness Devices (Rev. C) Aug. 18, 2014
Application note Accurately measuring efficiency of ultralow-IQ devices Jan. 22, 2014
More literature Industry’s Most Efficient Nano Power Harvesting Solutions (Rev. A) Nov. 08, 2013

Design & development

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

Software development

CODE EXAMPLE OR DEMO Download
SLUC463A.ZIP (31 KB)

Design tools & simulation

CALCULATION TOOL Download
SLUC484.ZIP (284 KB)

Reference designs

REFERENCE DESIGNS Download
Energy Harvesting Ambient Light and Environment Sensor Node for Sub-1GHz Networks Reference Design
TIDA-00488 — 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 (...)
document-generic Schematic
REFERENCE DESIGNS Download
Energy Harvesting and Fault Indicator Subsystem for Overhead Fault Indicators Reference Design
TIDA-00998 — 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 (...)
document-generic Schematic
REFERENCE DESIGNS Download
Indoor Light Energy Harvesting Reference Design for Bluetooth Low Energy (BLE) Beacon Subsystem
TIDA-00100 — 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 (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
VQFN (RGR) 20 View options

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