BQ25871 1S 7A Battery Switch Charger with Integrated ADC | TI.com

BQ25871 (ACTIVE) 1S 7A Battery Switch Charger with Integrated ADC

 

Description

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.

Features

  • 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)
    • VDROP (VBUS-VOUT) OVP
    • 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

Parametrics

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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)
BQ25871 Order now 1     Charger     Li-Ion/Li-Polymer     7     2.8     6     22     4.2     4.975     Integrated ADC
Integrated FET
OVP
Temp Monitoring (Thermistor Pin)
Temp Monitoring (Thermistor Pin)    
I2C     Flash Charger     Catalog     -40 to 85     DSBGA | 42     See datasheet (DSBGA)    
BQ25872 Order now 1     Charger     Li-Ion/Li-Polymer     7     2.8     6     40     4.2     4.975     Integrated ADC
Integrated FET
OVP
Temp Monitoring (Thermistor Pin)
Temp Monitoring (Thermistor Pin)
Thermal Regulation
External OVP controller    
I2C     Flash Charger     Catalog     -40 to 85     DSBGA | 42     See datasheet (DSBGA)