BQ25871 (ACTIVE)

1S 7A Battery Switch Charger with Integrated ADC

1S 7A Battery Switch Charger with Integrated ADC - BQ25871


The device is a 7-A battery switch charger with an integrated 10-bit ADC. The high-current battery switch charger is a 13-mΩ MOSFET with reverse current blocking designed for high efficiency and minimal voltage drop. The high-charge current capability of the device makes it ideal for smartphones, tablets, and other portable devices with large battery capacity.

The integrated 10-bit ADC can measure input voltage and current, battery voltage and current, as well as battery temperature and input connector temperature. This allows the user application to continuously monitor the power input and battery charging parameters to ensure the safety of the battery charging. The flexible OVP and OCP thresholds for VBUS, VOUT, and battery can be modified via I2C registers as the battery goes through constant current (CC) and constant voltage (CV) mode.

The I2C serial interface of the device can operate at speeds up to 1 MHz and allows access to the ADC’s measurements of the different charging parameters and also allows for flexible software control of the device. The INT pin provides instantaneous feedback to the host in case of a fault condition. I2C status registers allow the host to read the current status of all faults and events.


  • Adapter Input Voltage Range: 3 V to 14 V
    • Allow up to 14-V Adaptor Voltage
  • Highly Integrated 7-A Battery Switch
    • Integrated MOSFETs and Current Sensing
    • Low RDS(on) (13-mΩ) MOSFETs for High Current Operation
  • Integrated High Accuracy ADC for System Monitor
    • VBUS, VBAT, VOUT, VDROP Voltage
    • Input and Battery Current
    • Battery and VBUS Connector Temperature
  • Linear Regulation (LDO) Mode Operation
    • Four Linear Regulation Loops: IBUS, IBAT, VBAT and VOUT
    • Programmable Linear Regulation Thresholds
  • Programmable Safety Protections
    • VBUS, VOUT, and VBAT Over Voltage Protections (OVP)
    • IBUS and IBAT Over Current Protection (OCP)
    • IBUS Reverse Current Protection (RCP)
    • VBUS Connector and Battery Thermal Protection
    • Thermal Shutdown
  • Interrupt Status Output For Host Processor Alert
  • Up To 1-MHz I2C Read and Write Speed
  • Low Battery Leakage Current in Battery Only Mode
  • WCSP Package for Small Footprint

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Parametrics Compare all products in Battery Charger IC

Number of Series Cells
Cell Chemistry
Battery Charge Voltage (Min) (V)
Battery Charge Voltage (Max) (V)
Charge Current (Max) (A)
Control Interface
Control Topology
Operating Temperature Range (C)
Operating Vin (Min) (V)
Operating Vin (Max) (V)
Absolute Vin (safety rating) (Max) ((V))
BQ25871 BQ25872
1    1   
Charger    Charger   
Li-Ion/Li-Polymer    Li-Ion/Li-Polymer   
4.2    4.2   
4.975    4.975   
Integrated FET
Over Voltage Protection
Standard BAT Temp Monitoring
Temp Monitoring (Thermistor Pin)   
Integrated FET
Over Voltage Protection
Standard BAT Temp Monitoring
Temp Monitoring (Thermistor Pin)
Thermal Regulation   
7    7   
I2C    I2C   
Flash Charger    Flash Charger   
Catalog    Catalog   
-40 to 85    -40 to 85   
42DSBGA    42DSBGA   
2.8    2.8   
6    6   
22    40   

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