BQ24123 Synchronous Switch-Mode 2-cell Li-Ion Charger w/2A FET, enhanced EMI performance | TI.com

BQ24123 (ACTIVE)

Synchronous Switch-Mode 2-cell Li-Ion Charger w/2A FET, enhanced EMI performance

Synchronous Switch-Mode 2-cell Li-Ion Charger w/2A FET, enhanced EMI performance - BQ24123
 

Description

The bqSWITCHER™ series are highly integrated Li-ion and Li-polymer switched-mode charge management devices targeted at a wide range of portable applications. The bqSWITCHER™ series offers integrated synchronous PWM controller and power FETs, high-accuracy current and voltage regulation, charge preconditioning, charge status, and charge termination, in a small, thermally enhanced QFN package.

The bqSWITCHER charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on user-selectable minimum current level. A programmable charge timer provides a safety backup for charge termination. The bqSWITCHER automatically restarts the charge cycle if the battery voltage falls below an internal threshold. The bqSWITCHER automatically enters sleep mode when VCC supply is removed.

Features

  • Enhanced EMI Performance
  • Integrated Power FETs For Up To 2-A Charge
    Rate
  • Suitable For 1-, 2-, or 3-Cell Li-Ion and Li-Polymer
    Battery Packs
  • Synchronous Fixed-Frequency PWM Controller
    Operating at 1.1 MHz With 0% to 100% Duty
    Cycle
  • High-Accuracy Voltage and Current Regulation
  • Status Outputs For LED or Host Processor
    Interface Indicates Charge-In-Progress, Charge
    Completion, Fault, and AC-Adapter Present
    Conditions
  • 20-V Absolute Maximum Voltage Rating on IN and
    OUT Pins
  • Accurate High-Side Battery Current Sensing
  • Battery Temperature Monitoring
  • Automatic Sleep Mode for Low Power
    Consumption
  • Reverse Leakage Protection Prevents Battery
    Drainage
  • Thermal Shutdown and Protection
  • Built-In Battery Detection
  • Available in 20-pin 3.5-mm × 4.5-mm VQFN
    Package

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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))
BQ24123 BQ24120 BQ24125
1
2
3    
1     1
2
3    
Charger     Charger     Charger    
Li-Ion/Li-Polymer     Li-Ion/Li-Polymer     Li-Ion/Li-Polymer    
4.2
8.4    
4.2     2.1    
4.2
8.4    
4.2     15.5    
Integrated FET
Temp Monitoring (Thermistor Pin)    
Integrated FET
Temp Monitoring (Thermistor Pin)    
Integrated FET
Temp Monitoring (Thermistor Pin)    
2     2     2    
Standalone (RC-Settable)     Standalone (RC-Settable)     Standalone (RC-Settable)    
Switch-Mode Buck     Switch-Mode Buck     Switch-Mode Buck    
Catalog     Catalog     Catalog    
-40 to 85     -40 to 85     -40 to 125    
20VQFN     20VQFN     20VQFN    
4.35     4.35     4.35    
16     16     16    
20     20     20    

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