Product details


Number of series cells 1 Charge current (Max) (A) 1 Operating Vin (Max) (V) 6.45 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)) 12 Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, Input OVP, VINDPM (Input voltage threshold to maximize adaptor power) Operating Vin (Min) (V) 4.45 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

HVSSOP (DGQ) 10 9 mm² 3 x 3 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
  • Protection
    • 6.6-V 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 – ½ fast-charge-current at cold, 4.06 V at hot, BQ092/3
    • Fixed 10-hour safety timer
  • System
    • Automatic Termination and Timer Disable Mode (TTDM) for absent battery pack with thermistor
    • Status indication – charging/done
    • Available in a small 10-pin MSOP package
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The BQ2409x 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 BQ2409x 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. 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
* Data sheet BQ2409x 1-A, Single-Input, Single-Cell Li-Ion and Li-Pol Battery Chargers datasheet (Rev. H) Apr. 27, 2021
Technical article When to use rechargeable batteries in small battery applications Oct. 01, 2019
Application note BQ2404x, BQ2405x, and BQ2409x Frequently Asked Questions Feb. 25, 2019
Technical article Learn the basics of battery charging in power banks May 04, 2016
Technical article Should I use a linear charger or a switching charger? Oct. 31, 2015
More literature Battery Management Solutions for Wearable and Fitness Devices (Rev. C) Aug. 18, 2014
Technical article Summertime and the livin' is easy Jun. 20, 2014
Application note Building your own Battery Simulator Oct. 14, 2013
More literature Power Bank Charger ICs Feb. 25, 2013
User guide 1.0-A Single-Input, Single-Cell Li-Ion Battery Charger . Dec. 31, 2012
Application note Selecting the Best bq2404x/5x/9x Single Cell Battery Charger for your Applicatio Nov. 29, 2012
Application note 2Q 2012 Issue Analog Applications Journal Apr. 26, 2012
User guide 1.0-A Single-Input, Single-Cell Li-Ion Battery Charger (Rev. A) Jun. 07, 2010

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 user’s guide for BQ24090EVM describes the bq24090 evaluation module (EVM), how to perform a stand-alone evaluation or interface with a host or system. The charger is designed to deliver up to 1000mA of continuous current to the battery output when programmed with a resistor on the ISET pin (...)

Design tools & simulation

SLUC248.ZIP (223 KB)
SLUC670.ZIP (350 KB)

Reference designs

リファレンス・デザイン Download
1A Single-Input, Single Cell Li-Ion and Li-Pol Battery Charger Reference Design
TIDA-00043 This reference design delivers up to 1000 mA of continuous current to the battery output when programmed with a resistor on the ISET pin and is programmed at the factory for ~540 mA. The USB current limit modes are selected by the ISET2 pin and limits current to a maximum of 500 mA (logic high (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
HVSSOP (DGQ) 10 View options

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