Product details

Number of series cells 1, 2, 3 Charge current (Max) (A) 2 Operating Vin (Max) (V) 16 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiCd, NiMH Battery charge voltage (Min) (V) 2.1 Battery charge voltage (Max) (V) 15.5 Absolute Vin (safety rating) (Max) ((V)) 20 Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile), Input OVP Operating Vin (Min) (V) 4.35 Rating Automotive
Number of series cells 1, 2, 3 Charge current (Max) (A) 2 Operating Vin (Max) (V) 16 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiCd, NiMH Battery charge voltage (Min) (V) 2.1 Battery charge voltage (Max) (V) 15.5 Absolute Vin (safety rating) (Max) ((V)) 20 Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile), Input OVP Operating Vin (Min) (V) 4.35 Rating Automotive
VQFN (RHL) 20 16 mm² 3.5 x 4.5
  • Qualified for Automotive Applications
  • Ideal For Highly Efficient Charger Designs For
    Single-, Two-, or Three-Cell Li-Ion and Li-Polymer
    Battery Packs
  • Also for LiFePO4 Battery (see Using bq24105 to Charge LiFePO4 Battery)
  • Integrated Synchronous Fixed-Frequency PWM Controller Operating at 1.1 MHz
    With 0% to 100% Duty Cycle
  • Integrated Power FETs For Up To 2-A Charge Rate
  • High-Accuracy Voltage and Current Regulation
  • Stand-Alone (Built-In Charge Management and Control) Version
  • Status Outputs For LED or Host Processor Interface Indicates Charge-In-Progress,
    Charge Completion, Fault, and AC-Adapter Present Conditions
  • 20-V Maximum Voltage Rating on IN and OUT Pins
  • High-Side Battery Current Sensing
  • Battery Temperature Monitoring
  • Automatic Sleep Mode for Low Power Consumption
  • Reverse Leakage Protection Prevents Battery Drainage
  • Thermal Shutdown and Protection
  • Built-In Battery Detection
  • Available in 20-Pin, 3.5 mm × 4.5 mm, QFN Package

All trademarks are the property of their respective owners.

  • Qualified for Automotive Applications
  • Ideal For Highly Efficient Charger Designs For
    Single-, Two-, or Three-Cell Li-Ion and Li-Polymer
    Battery Packs
  • Also for LiFePO4 Battery (see Using bq24105 to Charge LiFePO4 Battery)
  • Integrated Synchronous Fixed-Frequency PWM Controller Operating at 1.1 MHz
    With 0% to 100% Duty Cycle
  • Integrated Power FETs For Up To 2-A Charge Rate
  • High-Accuracy Voltage and Current Regulation
  • Stand-Alone (Built-In Charge Management and Control) Version
  • Status Outputs For LED or Host Processor Interface Indicates Charge-In-Progress,
    Charge Completion, Fault, and AC-Adapter Present Conditions
  • 20-V Maximum Voltage Rating on IN and OUT Pins
  • High-Side Battery Current Sensing
  • Battery Temperature Monitoring
  • Automatic Sleep Mode for Low Power Consumption
  • Reverse Leakage Protection Prevents Battery Drainage
  • Thermal Shutdown and Protection
  • Built-In Battery Detection
  • Available in 20-Pin, 3.5 mm × 4.5 mm, QFN Package

All trademarks are the property of their respective owners.

The bqSWITCHER™ series are highly integrated Li-ion and Li-polymer switch-mode charge management devices targeted at a wide range of portable applications. The bqSWITCHER™ series offers integrated synchronous PWM controller and power FETs, high-accuracy current and voltage regulation, charge preconditioning, charge status, and charge termination, in a small, thermally enhanced QFN package.

The bqSWITCHER charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on user-selectable minimum current level. A programmable charge timer provides a safety backup for charge termination. The bqSWITCHER automatically restarts the charge cycle if the battery voltage falls below an internal threshold. The bqSWITCHER automatically enters sleep mode when VCC supply is removed.

The bqSWITCHER™ series are highly integrated Li-ion and Li-polymer switch-mode charge management devices targeted at a wide range of portable applications. The bqSWITCHER™ series offers integrated synchronous PWM controller and power FETs, high-accuracy current and voltage regulation, charge preconditioning, charge status, and charge termination, in a small, thermally enhanced QFN package.

The bqSWITCHER charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on user-selectable minimum current level. A programmable charge timer provides a safety backup for charge termination. The bqSWITCHER automatically restarts the charge cycle if the battery voltage falls below an internal threshold. The bqSWITCHER automatically enters sleep mode when VCC supply is removed.

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Technical documentation

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Type Title Date
* Data sheet Synchronous Switch-Mode, Li-Ion, and Li-Pol Charge Management IC (bqSwitcher) datasheet (Rev. A) 03 May 2012
Technical article When to use rechargeable batteries in small battery applications 01 Oct 2019
Application note Charging NiMH Battery using bq24105-Q1 In Automotive Applications 12 Nov 2017
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
User guide Using the bq241xx bqSWITCHER(tm) (Rev. A) 29 Nov 2007

Design & development

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

Evaluation board

BQ24105EVM — BQ24105 Evaluation Module

The Texas Instruments bq24105EVM is the evaluation module (EVM) for the bq24105 Li-Ion charge management IC. The bq24105 is a highly integrated battery charge IC utilizing synchronous switch mode power conversion for efficient and comprehensive charge control of a one, two, or three series cell (...)

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VQFN (RHL) 20 View options

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