Product details


Number of series cells 1 Charge current (Max) (A) 1 Operating Vin (Max) (V) 6.5 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (Min) (V) 4.35 Battery charge voltage (Max) (V) 4.35 Absolute Vin (safety rating) (Max) ((V)) 30 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, Input OVP, VINDPM (Input voltage threshold to maximize adaptor power) Operating Vin (Min) (V) 3.5 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

WSON (DSQ) 10 4 mm² 2 x 2 open-in-new Find other Battery charger ICs


  • Charging
    • 1% Charge voltage accuracy
    • 10% Charge current accuracy
    • Pin selectable USB 100 mA and 500 mA maximum input current limit
    • Programmable termination and precharge threshold, BQ24040 and BQ24045
    • High voltage (4.35 V) chemistry support with BQ24045
  • Protection
    • 30V Input rating; with 6.6 V or 7.1 V input overvoltage protection
    • Input voltage dynamic power management
    • 125°C thermal regulation; 150°C thermal shutdown protection
    • OUT Short-circuit protection and ISET short detection
    • Operation over JEITA range via battery NTC – 1/2 fast-charge-current at Cold, 4.06V at Hot, BQ24040 and BQ24045
    • Fixed 10 hour safety timer, BQ24040 and BQ24045
  • System
    • Automatic termination and timer disable mode (TTDM) for absent battery pack with thermistor, BQ24040 and BQ24045
    • Status indication – charging and done
    • Available in small 2 × 2 mm2 DFN-10 package
    • Integrated auto start function for production line testing, BQ24041
  • Functional Safety-Capable (BQ24040)
  • Safety and regulatory approval:
    • IEC 62368-1 End equipment standard

All trademarks are the property of their respective owners.

open-in-new Find other Battery charger ICs


The BQ2404x series of devices are highly integrated Li-Ion and Li-Pol linear chargers devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters.

The BQ2404x has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10 hour safety timer.

The battery is charged in three phases: conditioning, constant current and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded.

The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The pre-charge current and termination current threshold are programmed through an external resistor on the BQ24040 and BQ24045. The fast charge current value is also programmable through an external resistor.

open-in-new Find other Battery charger ICs
Similar products you might be interested in
open-in-new Compare products
Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
NEW BQ25170 PREVIEW 800-mA linear battery charger for 1-cell li-ion and LiFePO4 This product is a 800-mA, single cell Li-Ion and LiFePO4 battery linear charger with programmable charge voltage
Similar but not functionally equivalent to the compared device:
BQ24072 ACTIVE Standalone 1-cell 1.5-A linear charger, Power Path, 4.2-V VBAT and VOUT=VBAT + 225mV This product is a 1.5-A 1-cell Li-Ion battery charger with power path

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 9
Type Title Date
* Datasheet 1A, Single-Input, Single Cell Li-Ion and Li-Pol Battery Charger datasheet (Rev. G) Nov. 17, 2015
Technical articles When to use rechargeable batteries in small battery applications Oct. 01, 2019
Application notes BQ2404x, BQ2405x, and BQ2409x Frequently Asked Questions Feb. 25, 2019
Technical articles Should I use a linear charger or a switching charger? Oct. 30, 2015
More literature Battery Management Solutions for Wearable and Fitness Devices (Rev. C) Aug. 18, 2014
Technical articles Summertime and the livin' is easy Jun. 20, 2014
Application notes Building your own Battery Simulator Oct. 14, 2013
More literature Power Bank Charger ICs Feb. 25, 2013
User guides 1-A Single-Input, Single-Cell Li-Ion Battery Charger Dec. 31, 2012

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 bq2404x series of devices are highly integrated Li-ion linear charger devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The bq2404x has a single power output that charges the battery. A system load can be placed in parallel with (...)

  • 1% Charge Voltage Accuracy
  • 10% Charge Current Accuracy
  • Pin Selectable USB 100mA and 500mA Maximum Input Current Limit
  • Programmable Termination and Pre-charge Threshold
  • 6.6V or 7.1V Input Over-Voltage Protection
  • Input Voltage Dynamic Power Management
  • Fixed 10 Hour Safety Timer
  • OUT Short-Circuit Protection (...)

Design tools & simulation

SLUC670.ZIP (350 KB)

CAD/CAE symbols

Package Pins Download
WSON (DSQ) 10 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