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BQ24040DSQT - 4.2V Battery Charger IC Li-Ion

BQ24040DSQT - 4.2V Battery Charger IC Li-Ion

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


  • Battery Charge Voltage: 4.2V
  • Battery IC Case Style: SON
  • Battery Type: Li-Ion
  • Charge Current Max: 800mA
  • Input Voltage: 6.45V
  • MSL: MSL 2 - 1 year
  • No. of Pins: 10
  • No. of Series Cells: 1
  • Operating Temperature Max: 85°C
  • Operating Temperature Min: -40°C



  • 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

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


  • 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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  • Views: 1539
  • Product Code: BQ24040DSQT - Battery Charger IC Li-Ion
  • Availability: In Stock
  • Rs45.00

Tags: bq24040dsqt, 24040, battery, charger, smd, ic, li-ion, power, product, power converter, accessories

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