Product details

Number of series cells 1 Charge current (Max) (A) 1 Operating Vin (Max) (V) 6.5 TI functional safety category Functional Safety-Capable 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)) 30 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
Number of series cells 1 Charge current (Max) (A) 1 Operating Vin (Max) (V) 6.5 TI functional safety category Functional Safety-Capable 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)) 30 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
WSON (DSQ) 10 4 mm² 2 x 2
  • 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-Related Certifications:
    • IEC 62368-1 CB Certification (BQ24040, BQ24045)
  • 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-Related Certifications:
    • IEC 62368-1 CB Certification (BQ24040, BQ24045)

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.

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.

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Technical documentation

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Type Title Date
* Data sheet BQ2404x 1A, Single-Input, Single Cell Li-Ion and Li-Pol Battery Charger datasheet (Rev. H) 01 Feb 2021
Technical article Benefits of rechargeable batteries in real-time location system trackers 10 Aug 2020
Technical article Accelerate your electric mask design 01 Jul 2020
Functional safety information BQ24040 Pin FMA 15 Jan 2020
Functional safety information BQ2404x FIT Rate 20 Dec 2019
Technical article When to use rechargeable batteries in small battery applications 01 Oct 2019
Application note BQ2404x, BQ2405x, and BQ2409x Frequently Asked Questions 25 Feb 2019
Application note BQ24040 Quick Start Guide 28 Jun 2018
Technical article How to choose the right linear charger for your application 17 Nov 2017
Analog Design Journal Battery-charging considerations for low-power applications 26 Apr 2016
More literature Battery Management Solutions for Point of Sale Systems 18 Aug 2014
More literature Battery Management Solutions for Wearable and Fitness Devices (Rev. C) 18 Aug 2014
Application note Building your own Battery Simulator 14 Oct 2013
More literature Power Bank Charger ICs 25 Feb 2013
User guide 1-A Single-Input, Single-Cell Li-Ion Battery Charger 31 Dec 2012
Application note Selecting the Best bq2404x/5x/9x Single Cell Battery Charger for your Applicatio 29 Nov 2012
Analog Design Journal 2Q 2012 Issue Analog Applications Journal 26 Apr 2012
User guide 0.8-A, Single-Input Single-Cell Li-Ion Battery Charger UG 29 Sep 2009

Design & development

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

Evaluation board

BQ24040EVM — BQ24040 Evaluation Module: 1A Single-Input, Single-Cell Li-Ion Battery Charger

BQ24040 Evaluation Module: 1A Single-Input, Single-Cell Li-Ion Battery Charger

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 (...)

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Gerber file

Linear Charger NTC Calculator

SLUC670.ZIP (350 KB)
Reference designs

TIDA-00042 — 1A Single-Input Single-Cell Li-Ion Battery Charger Reference Design

This reference design is targeted at space-limited portable applications. The devices in the design operate from either a USB port or AC adapter. The solution 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 (...)
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WSON (DSQ) 10 View options

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