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 Battery charge voltage (Min) (V) 4.2, 8.4 Battery charge voltage (Max) (V) 4.2, 8.4 Absolute Vin (safety rating) (Max) ((V)) 20 Control topology Switch-Mode Buck Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile), Input OVP Operating Vin (Min) (V) 4.35 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

VQFN (RHL) 20 16 mm² 3.5 x 4.5 open-in-new Find other Battery charger ICs


  • Enhanced EMI Performance
  • Integrated Power FETs For Up To 2-A Charge
  • Suitable For 1-, 2-, or 3-Cell Li-Ion and Li-Polymer
    Battery Packs
  • Synchronous Fixed-Frequency PWM Controller
    Operating at 1.1 MHz With 0% to 100% Duty
  • High-Accuracy Voltage and Current Regulation
  • Status Outputs For LED or Host Processor
    Interface Indicates Charge-In-Progress, Charge
    Completion, Fault, and AC-Adapter Present
  • 20-V Absolute Maximum Voltage Rating on IN and
    OUT Pins
  • Accurate High-Side Battery Current Sensing
  • Battery Temperature Monitoring
  • Automatic Sleep Mode for Low Power
  • Reverse Leakage Protection Prevents Battery
  • Thermal Shutdown and Protection
  • Built-In Battery Detection
  • Available in 20-pin 3.5-mm × 4.5-mm VQFN
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The bqSWITCHER™ series are highly integrated Li-ion and Li-polymer switched-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 bq2412x Single-Chip Switched-Mode, Li-Ion, and Li-Polymer Charge-Management IC With Enhanced EMI Performance (bqSWITCHER™) datasheet (Rev. H) Nov. 30, 2015
Technical article When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical article Should I use a linear charger or a switching charger? Oct. 31, 2015
Technical article Summertime and the livin' is easy Jun. 20, 2014
User guide Using the bq24120/3 (bqSwitcher)(TM) (Rev. A) Nov. 05, 2007
Application note Implementations of Battery Charger and Power-Path Mgmt System Using bq241xx Jun. 06, 2006

Design & development

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

Hardware development

bq24123 Evaluation Module

The bq24123EVM-002 provides a convenient method for evaluating the performance of a charge management solution for portable applications using the bq24123. The charger can deliver up to 2 A of continuous output current and is programmed from the factory to deliver 1.33 A of charging (...)

  • Input voltage: 5 V to 16 V (one cell) or 9.2 V to 16 V (two cell)
  • Charge rate: 1.33 A
  • Output regulation voltage: 4.2 V (factory default) or 8.4 V (two cell)
  • Number of series cells: 1 or 2 series (configured with jumper)

Software development

Temp Sense Designer Software
TEMPSENSE-SW The TempSense Designer software allows the user to easily design temperature sensing circuits for many of the Texas Instruments battery charger devices. A full listing of the supported devices is included under the "Support" menu in the program. The user can use the thermisters included in the (...)

The program gives the user:

  • Worse-case limits of the resistance
  • Trip voltages
  • Temperatures of the design

CAD/CAE symbols

Package Pins Download
VQFN (RHL) 20 View options

Ordering & quality

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  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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