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Product details

Parameters

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) 4.2 Battery charge voltage (Max) (V) 4.2 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

Features

  • Charging
    • 1% Charge Voltage Accuracy
    • 10% Charge Current Accuracy
    • Pin Selectable USB 100mA and 500mA
      Maximum Input Current Limit
    • Programmable Termination and Precharge
      Threshold, bq24040 and bq24045
    • High voltage (4.35V) Chemistry Support with
      bq24045
  • Protection
    • 30V Input Rating; with 6.6V or 7.1V 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/Done
    • Available in Small 2×2mm2 DFN-10 Package
    • Integrated Auto Start Function for Production
      Line Testing, bq24041
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Description

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 via an external resistor on the bq24040 and bq24045. The fast charge current value is also programmable via an external resistor.

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Technical documentation

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Type Title Date
* Datasheet bq2404x 1A, Single-Input, Single Cell Li-Ion and Li-Pol Battery Charger With Auto Start datasheet (Rev. F) Mar. 16, 2015
Application notes BQ24040 Pin FMA Jan. 15, 2020
Application notes BQ2404x FIT Rate Dec. 20, 2019
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
Application notes BQ24040 Quick Start Guide Jun. 28, 2018
Technical articles How to choose the right linear charger for your application Nov. 17, 2017
Application notes Battery-charging considerations for low-power applications Apr. 26, 2016
Technical articles Should I use a linear charger or a switching charger? Oct. 30, 2015
Technical articles Advanced charging features extend battery run time for wearables Jun. 29, 2015
More literature Battery Management Solutions for Point of Sale Systems Aug. 18, 2014
More literature Battery Management Solutions for Wearable and Fitness Devices (Rev. C) Aug. 18, 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
Application notes Selecting the Best bq2404x/5x/9x Single Cell Battery Charger for your Applicatio Nov. 29, 2012
Application notes 2Q 2012 Issue Analog Applications Journal Apr. 26, 2012
Application notes Charging a three-cell nickel-based battery pack with a Li-Ion charger Apr. 26, 2012
User guides 0.8-A, Single-Input Single-Cell Li-Ion Battery Charger UG Sep. 29, 2009

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$99.00
Description

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 (...)

Design tools & simulation

GERBER FILES Download
SLUC670.ZIP (350 KB)

Reference designs

REFERENCE DESIGNS Download
1A Single-Input Single-Cell Li-Ion Battery Charger Reference Design
TIDA-00042 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 (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
WSON (DSQ) 10 View options

Ordering & quality

Support & training

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