BQ25970 8A Switched Cap Battery Charger with Integrated Protection |

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8A Switched Cap Battery Charger with Integrated Protection


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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.


  • 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

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WEBENCH® Designer BQ25970

Product Option
Battery Specifications:
Chemistry Lithium Ion/Lithium Polymer
  Series Parallel
Cell Count
Cell Capacity  mAh  
Total Capacity mAh  
Charger Specifications:
Vin  V
Iin  A ≤ 4.50A
Vchg  V 3.50 to 4.65V
Ichg  A ≤ 9.00A
Ambient Temp °C -40 to 85°C


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Part number Order Number of series cells Function Cell chemistry Charge current (Max) (A) Operating Vin (Min) (V) Operating Vin (Max) (V) Absolute Vin (safety rating) (Max) ((V)) Battery charge voltage (Min) (V) Battery charge voltage (Max) (V) Features Control interface Control topology Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
BQ25970 Order now 1     Charger     Li-Ion/Li-Polymer
Lithium Phosphate/LiFePO4    
8     3.2     12     20     3.5     4.65     External OVP controller
Integrated ADC
Temp Monitoring (Thermistor Pin)
Thermal Regulation
I2C     Flash Charger     Catalog     -40 to 85     DSBGA | 56     56DSBGA: 9 mm2: 2.8 x 3.2 (DSBGA | 56)