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Product details

Parameters

Number of series cells 1 Charge current (Max) (A) 2 Operating Vin (Max) (V) 16 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (Min) (V) 4.2 Battery charge voltage (Max) (V) 4.2 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

Features

  • Enhanced EMI Performance
  • Integrated Power FETs For Up To 2-A Charge
    Rate
  • 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
    Cycle
  • 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
    Conditions
  • 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
    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 VQFN
    Package
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Description

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

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet 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 articles When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical articles Should I use a linear charger or a switching charger? Oct. 30, 2015
Technical articles Summertime and the livin' is easy Jun. 20, 2014
User guides Using the bq24120/3 (bqSwitcher)(TM) (Rev. A) Nov. 05, 2007
Application notes 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.

Software development

SUPPORT SOFTWARE Download
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 (...)
Features

The program gives the user:

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

Reference designs

REFERENCE DESIGNS Download
Single-Cell Li-Ion Charger for Enhanced EMI Performance in Handheld Industrial Applications Design
PMP5291 The PMP5291 is a single cell Lithium-ion battery charger reference design optimized for small low profile applications. The inductors used in the design are 1mm in height and the PC board is 20mmX30mm. Integrated power MOSFETs enable low EMI operation and minimize component count. The design was (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RHL) 20 View options

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