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)) 30 Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (JEITA profile), BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, Input OVP, USB D+/D-/BC1.2 integrated, 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
  • Protection
    • 30-V Input Rating; With 6.6-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 through battery NTC - ½ fast-charge-current at cold, 4.06 V at hot
    • Fixed 10-hour safety timer
  • System
    • Auto input source detection (D+, D– pins)
      • No device transceiver required
      • USB Friendly
    • Automatic termination and timer disable mode (TTDM) for absent battery pack with thermistor
    • Status indication – charging/done
    • Available in small 2-mm × 2-mm package
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The BQ2405x 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 BQ2405x 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 precharge current and termination current threshold are programmed through an external resistor. The fast charge current value is also programmable through an external resistor.

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BQ24040 ACTIVE Standalone 1-cell 1-A linear battery charger with 4.2-V VBAT and Temperature Sensing This product is a 1A, standalone, single-cell Li-Ion battery charger in a 2x2mm package

Technical documentation

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Type Title Date
* Data sheet BQ2405x 1-A, Single-Cell Li-Ion and Li-Pol Battery Charger With Automatic Adaptor and USB Detection datasheet (Rev. D) May 26, 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 Should I use a linear charger or a switching charger? Oct. 31, 2015
Technical article Summertime and the livin' is easy Jun. 20, 2014
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
More literature Журнал по применению аналоговых компонентов 1 кв. 2010 Sep. 23, 2010
Application note Li-ion battery-charger solutions for JEITA compliance Jan. 29, 2010
User guide 0.8-A, Single-Input, Single-Cell Li-Ion Battery Charger UG Sep. 29, 2009

Design & development

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Hardware development

document-generic User guide

0.8-A, Single-Input, Single-Cell Li-Ion Battery Charger

The bq2405x series of devices are highly integrated Li-ion linear chargers devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The bq2405x has a single power output that charges the (...)

Design tools & simulation

SLUC670.ZIP (350 KB)

Reference designs

Single Cell Battery Power Solution Reference Design
PMP5722 This reference design shows the functionality and performance of a complete single-cell battery power solution using a coin-cell Li-Ion battery. It can be powered either by an external adapter or by an USB port. When the board is connected to a computer, the load current, state-of-charge, and much (...)
document-generic Schematic

CAD/CAE symbols

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WSON (DSQ) 10 View options

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