Product details

Number of series cells 1 Charge current (Max) (A) 1 Operating Vin (Max) (V) 5.5 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (Min) (V) 3.6 Battery charge voltage (Max) (V) 4.65 Absolute Vin (safety rating) (Max) ((V)) 25 Control interface I2C Features BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, IINDPM (Input current limit), Input OVP, Power Path, VINDPM (Input voltage threshold to maximize adaptor power) Operating Vin (Min) (V) 3 Rating Catalog
Number of series cells 1 Charge current (Max) (A) 1 Operating Vin (Max) (V) 5.5 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (Min) (V) 3.6 Battery charge voltage (Max) (V) 4.65 Absolute Vin (safety rating) (Max) ((V)) 25 Control interface I2C Features BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, IINDPM (Input current limit), Input OVP, Power Path, VINDPM (Input voltage threshold to maximize adaptor power) Operating Vin (Min) (V) 3 Rating Catalog
  • 1-A Power path linear battery charger
    • 3.0-V to 5.9-V input voltage operating range
    • 25-V tolerant input voltage
    • Configurable battery regulation voltage with 0.5% accuracy from 3.6 V to 4.65 V in 10-mV steps
    • 5-mA to 1-A configurable fast charge current
    • 110-mΩ battery FET ON resistance
    • Up to 2.5-A discharge current to support high system loads
    • Configurable termination current down to 0.5 mA
    • Configurable NTC charging profile thresholds including JEITA support
    • Power cycle and advanced reset mechanisms to recover system
  • Power path management for powering the system and charging the battery
    • Regulated system voltage (SYS) ranging from 4.4 V to 4.9 V in addition to battery voltage tracking and input pass-though options
    • Configurable input current limit from 50mA to 1100mA
    • Selectable adapter or battery power for system
    • I2C allow host to disconnect the battery or adapter from system as needed
    • Dynamic power path management optimizes charging from weak adapters
  • Ultra low quiescent current modes
    • 15-nA Shutdown mode
    • 3.2-µA Ship mode with button press wake
    • 4 µA in Battery only mode
    • 40-µA input adapter Iq in Sleep mode
  • Dedicated VIN Power Good (/PG_GPO) and Charge Enable (/CE) pins
  • One push-button wake-up and reset input
  • Integrated fault protection
    • Input overvoltage protection (VIN_OVP)
    • Battery undervoltage protection (VBUVLO)
    • Battery short protection (BATSC)
    • Battery overcurrent protection (BATOCP)
    • Input current limit protection (ILIM)
    • Thermal regulation (TREG) and thermal shutdown (TSHUT)
    • Battery thermal fault protection (TS)
    • Watchdog and safety timer fault
    • System short protection
    • System overvoltage protection
  • 1-A Power path linear battery charger
    • 3.0-V to 5.9-V input voltage operating range
    • 25-V tolerant input voltage
    • Configurable battery regulation voltage with 0.5% accuracy from 3.6 V to 4.65 V in 10-mV steps
    • 5-mA to 1-A configurable fast charge current
    • 110-mΩ battery FET ON resistance
    • Up to 2.5-A discharge current to support high system loads
    • Configurable termination current down to 0.5 mA
    • Configurable NTC charging profile thresholds including JEITA support
    • Power cycle and advanced reset mechanisms to recover system
  • Power path management for powering the system and charging the battery
    • Regulated system voltage (SYS) ranging from 4.4 V to 4.9 V in addition to battery voltage tracking and input pass-though options
    • Configurable input current limit from 50mA to 1100mA
    • Selectable adapter or battery power for system
    • I2C allow host to disconnect the battery or adapter from system as needed
    • Dynamic power path management optimizes charging from weak adapters
  • Ultra low quiescent current modes
    • 15-nA Shutdown mode
    • 3.2-µA Ship mode with button press wake
    • 4 µA in Battery only mode
    • 40-µA input adapter Iq in Sleep mode
  • Dedicated VIN Power Good (/PG_GPO) and Charge Enable (/CE) pins
  • One push-button wake-up and reset input
  • Integrated fault protection
    • Input overvoltage protection (VIN_OVP)
    • Battery undervoltage protection (VBUVLO)
    • Battery short protection (BATSC)
    • Battery overcurrent protection (BATOCP)
    • Input current limit protection (ILIM)
    • Thermal regulation (TREG) and thermal shutdown (TSHUT)
    • Battery thermal fault protection (TS)
    • Watchdog and safety timer fault
    • System short protection
    • System overvoltage protection

The BQ25181 is a linear battery charger IC focusing on small solution size and low quiescent current for maximum battery life while providing the best thermal performance through a QFN package with a thermal pad. The PowerPath function enables continous power to the regulated system voltage (SYS) while charging the battery and providing accurate termination. The device can support up to 1-A charging and system loads of up to 2.5 A.

The BQ25181 is I2C compatible and is highly configurable providing flexibility and charging control for various applications. The BQ25181 is available in a small 10-pin DLH package.

The battery is charged using a standard Li-ion charge profile with three phases: precharge, constant current and constant voltage. A JEITA compatible batery pack thermistor monitor input (TS) is included, monitoring the battery temperature and automatically optimizing the charging parameters to prevent the battery from charging outsite its safe temperature range. The thermal regulation provides the maximum charge current while mantaining the device temperature. Dedicated /INT, /PG_GPO and /CE pins provide full customizability and intelligent diagnostics for reliable system operation.

The charger is also optimized for battery to battery charging with 3-V minimum input voltage operation and can withstand 25-V absolute maximum line transients. The device integrates a single push-button input and reset circuitry, eliminating the need for an external button controller reducing the total solution footprint.

The BQ25181 is a linear battery charger IC focusing on small solution size and low quiescent current for maximum battery life while providing the best thermal performance through a QFN package with a thermal pad. The PowerPath function enables continous power to the regulated system voltage (SYS) while charging the battery and providing accurate termination. The device can support up to 1-A charging and system loads of up to 2.5 A.

The BQ25181 is I2C compatible and is highly configurable providing flexibility and charging control for various applications. The BQ25181 is available in a small 10-pin DLH package.

The battery is charged using a standard Li-ion charge profile with three phases: precharge, constant current and constant voltage. A JEITA compatible batery pack thermistor monitor input (TS) is included, monitoring the battery temperature and automatically optimizing the charging parameters to prevent the battery from charging outsite its safe temperature range. The thermal regulation provides the maximum charge current while mantaining the device temperature. Dedicated /INT, /PG_GPO and /CE pins provide full customizability and intelligent diagnostics for reliable system operation.

The charger is also optimized for battery to battery charging with 3-V minimum input voltage operation and can withstand 25-V absolute maximum line transients. The device integrates a single push-button input and reset circuitry, eliminating the need for an external button controller reducing the total solution footprint.

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Technical documentation

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* Data sheet BQ25181 I2C Controlled, 1-Cell, 1-A Linear Battery Charger with Power Path and Ship Mode datasheet PDF | HTML 18 Apr 2022
Application note BQ25180 and BQ25181 I2C Controlled Linear Battery Chargers Small Form Factor Des PDF | HTML 10 Jun 2022
User guide BQ25181 User's Guide 12 Apr 2022
Technical article When to use rechargeable batteries in small battery applications 01 Oct 2019
Technical article Should I use a linear charger or a switching charger? 31 Oct 2015
Technical article Summertime and the livin' is easy 20 Jun 2014

Design & development

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Evaluation board

BQ25181EVM — BQ25181 evaluation module for I²C controlled, 1-cell, 1-A linear battery charger with power path

The BQ25181 evaluation module (EVM) is an integrated battery charge management IC that integrates the most common functions for wearable devices: linear charger, regulated output, manual reset with timer, ship mode, shutdown mode and advanced power path. The low quiescent current during operation (...)

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Application software & framework

TI-CHARGER-GUI — GUI software for use with USB2ANY & battery charging evaluation modules

The TI-CHARGER-GUI offers a web-based or standalone graphical user interface to assist in the process of evaluating, designing with, configuring or testing battery charger products. The software provides full access to registers and an easy interface to send and sequence commands.
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