BQ25971 (ACTIVE)

8A Switched Cap Battery Charger with Integrated Protection

 

More Information and Sample Availability

Full data sheet and other information are available. Request now

Description

The bq2597x is a 97% efficient, 8-A battery charging solution using a switched cap architecture. This architecture and the integrated FETs are optimized to enable a 50% duty cycle, allowing the cable current to be half the current delivered to the battery, reducing the losses over the charging cable as well as limiting the temperature rise in the application.

The dual-phase architecture reduces the input cap requirements as well as reducing the output voltage ripple. When used with a standard charger such as the bq2589x, the system enables the fastest charging at the lowest power loss from pre-charge through CC, CV, and termination.

The device integrates all the necessary protection features to ensure safe charging, including input over-voltage and over-current protection, output over-voltage and over-current protection, temperature sensing for the battery and cable, and monitoring the die temperature.

The device includes a 12-bit effective analog-to-digital converter (ADC) to provide bus voltage, bus current, output voltage, battery voltage, battery current, bus temperature, bat temperature, die temperature, and other calculated measurements needed to manage the charging of the battery from the smart wall adapter or power bank.

Features

  • 97% Efficient Power Stage for 8-A Fast Charge
  • Switched Cap Architecture Optimized for 50% Duty Cycle
    • Input Voltage is 2x Battery Voltage (3.5 V to 4.65 V)
    • Output Current is 2x of Input Current (up to
      4.5 A)
    • Reduces Power Loss Across the Cable
  • Integrated Programmable Protection Features for Safe Operation
    • Input Over-Voltage Protection (BUS_OVP)
    • Input Over-Current Protection (BUS_OCP) with Adjustable Alarm
    • Input Over-Voltage with External OVP FET (VAC_OVP up to 17 V, bq25970 only)
    • Battery Over-Voltage Protection (BAT_OVP) with Adjustable Alarm
    • Output Over-Voltage (VOUT_OVP)
    • Input Over-Current Protection (BUS_OCP) with Adjustable Alarm
    • IBAT Over-Current Protection (BAT_OCP) with Adjustable Alarm
    • Battery Temperature Monitoring
    • Connector Temperature Monitoring
  • Programmable Settings for System Optimization
    • Optional VBATREG and IBATREG Regulation for System Load and Wall Adapter Transients (bq25970 only with External OVP FET)
    • STAT, FLAG, and MASK options for Interrupts
    • ADC Readings and Configuration
  • Integrated 12-Bit Effective Analog-to Digital Converter (ADC)
    • ±0.5% BUS Voltage
    • ±0.5% VOUT Voltage
    • –0.4% to 0.2% BAT Voltage with Differential Sensing
    • ±1.5% BAT Current at 6 A with External RSENSE
    • ±1% BAT Temperature
    • ±1% BUS Temperature
    • ±4°C Die Temperature

All trademarks are the property of their respective owners.

View more

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))
BQ25971
1   
Charger   
Li-Ion/Li-Polymer
LiFePO4
Lithium phosphate   
3.5   
4.65   
Integrated ADC
Temp Monitoring (Thermistor Pin)
Thermal Regulation
Under Voltage Protection   
8   
I2C   
Flash Charger   
Catalog   
-40 to 85   
56DSBGA   
3.2   
12   
20