Product details


Number of series cells 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 Charge current (Max) (A) 10 Operating Vin (Max) (V) 40 Cell chemistry Lead Acid Battery charge voltage (Min) (V) 0 Battery charge voltage (Max) (V) 20 Absolute Vin (safety rating) (Max) ((V)) 40 Control topology Linear Control interface Standalone (RC-Settable) Operating Vin (Min) (V) 5 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

SOIC (DW) 16 77 mm² 10.3 x 7.5 open-in-new Find other Battery charger ICs


  • Regulates Both Voltage and Current During Charging
  • Precision Temperature-Compensated Reference:
    • Maximizes Battery Capacity Over Temperature
    • Ensures Safety While Charging Over Temperature
  • Optimum Control to Maximize Battery Capacity and Life
  • Supports Different Configurations
  • Minimum External Components
  • Available in 16-Pin SOIC (DW)
    • Emergency Lighting Systems
    • Security and Alarm Systems
    • Telecommunication Backup Power
    • Uninterruptible Power Supplies

open-in-new Find other Battery charger ICs


The bq24450 contains all the necessary circuitry to optimally control the charging of valve-regulated lead-acid batteries. The IC controls the charging current as well as the charging voltage to safely and efficiently charge the battery, maximizing battery capacity and life. Depending on the application, the IC can be configured as a simple constant-voltage float charge controller or a dual-voltage float-cum-boost charge controller.

The built-in precision voltage reference is especially temperature-compensated to track the characteristics of lead-acid cells, and maintains optimum charging voltage over an extended temperature range without using any external components. The ICs low current consumption allows for accurate temperature monitoring by minimizing self-heating effects.

The IC can support a wide range of battery capacities and charging currents, limited only by the selection of the external pass transistor. The versatile driver for the external pass transistor supports both NPN and PNP types and provides at least 25mA of base drive.

In addition to the voltage- and current-regulating amplifiers, the IC features comparators that monitor the charging voltage and current. These comparators feed into an internal state machine that sequences the charge cycle. Some of these comparator outputs are made available as status signals at external pins of the IC. These status and control pins can be connected to a processor, or they can be connected up in flexible ways for standalone applications.

open-in-new Find other Battery charger ICs

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 7
Type Title Date
* Datasheet Integrated Charge Controller for Lead-Acid Batteries.. datasheet (Rev. C) Feb. 01, 2012
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 BQ24450 EVM User's Guide Oct. 18, 2010
Application notes U-104 Improved Charging Methods for Lead-Acid Batteries Using the UC3906 Sep. 05, 1999
Application notes U-131 Simple Switchmode Lead-Acid Battery Charger Sep. 05, 1999

Design & development

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

Hardware development

document-generic User guide

The bq24450EVM-691 assists users in evaluating the bq24450 linear battery charger. The User's Guide manual includes the bq24450EVM-691 bill of materials, board layout, and schematic. The bq24450 contains all the necessary circuitry to optimally control the charging of lead-acid batteries. The IC (...)

  • Evaluation module for bq24450 (HPA691)
  • Charge controller for lead-acid batteries
  • Constant current and constant voltage modes
  • Accommodates external transistor in DPAK or TO-220 package
  • Programmable charge current
  • Pre-Charge for deeply discharged batteries

CAD/CAE symbols

Package Pins Download
SOIC (DW) 16 View options

Ordering & quality

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​


Related videos