Li-Ion Battery Charger for Single Cell Applications with 4.35V - BQ24045

BQ24045 (ACTIVE)

Li-Ion Battery Charger for Single Cell Applications with 4.35V

 

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.

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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Parametrics Compare all products in Battery Charger IC

 
Number of Series Cells
Function
Cell Chemistry
Battery Charge Voltage (Min) (V)
Battery Charge Voltage (Max) (V)
Features
Charge Current (Max) (A)
Control Interface
Control Topology
Rating
Operating Temperature Range (C)
Pin/Package
Operating Vin (Min) (V)
Operating Vin (Max) (V)
Absolute Vin (safety rating) (Max) ((V))
BQ24045 BQ21040 BQ24040 BQ24041 BQ24050 BQ24090
1    1    1    1    1    1   
Charger    Charger    Charger    Charger    Charger    Charger   
Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer   
4.35    4.2    4.2    4.2    4.2    4.2   
4.35    4.2    4.2    4.2    4.2    4.2   
JEITA BAT Temp Monitoring (Thermistor Pin)
Temp Monitoring (Thermistor Pin)
Thermal Regulation
Vin DPM (OK for Solar Power Source)   
Temp Monitoring (Thermistor Pin)    JEITA BAT Temp Monitoring (Thermistor Pin)
Temp Monitoring (Thermistor Pin)
Thermal Regulation
Vin DPM (OK for Solar Power Source)   
JEITA BAT Temp Monitoring (Thermistor Pin)
Temp Monitoring (Thermistor Pin)
Thermal Regulation
Vin DPM (OK for Solar Power Source)   
JEITA BAT Temp Monitoring (Thermistor Pin)
Temp Monitoring (Thermistor Pin)
Thermal Regulation
Vin DPM (OK for Solar Power Source)   
Temp Monitoring (Thermistor Pin)
Thermal Regulation
Vin DPM (OK for Solar Power Source)   
1    0.8    1    1    1    1   
Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)   
Linear    Linear    Linear    Linear    Linear    Linear   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
  0 to 125    0 to 125        0 to 125   
10WSON    6SOT-23    10WSON    10WSON    10WSON    10MSOP-PowerPAD   
3.5    3.5    3.5    3.5    3.5    4.45   
28    28    28    28    28    6.45   
30    30    30    30    30    12   

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