BQ25898C

• Operation as Slave Charger to Provide Fast Charging in Dual Charger Operation
• Simple Configuration with Minimum BOM
• High Efficiency 3-A, 1.5-MHz Switch Mode Buck Charge
  • 92% Charge Efficiency at 3 A and 94% Charge Efficiency at 2 A Charge Current
  • Optimize for High Voltage Input (9 V / 12 V)
  • Low Power PFM mode for Light Load Operations
• Single Input to Support USB Input and Adjustable High Voltage Adapters
  • Support 3.9-V to 14-V Input Voltage Range
  • Input Current Limit (100 mA to 3.25 A with 50-mA resolution) to Support USB2.0, USB3.0 standard and High Voltage Adapters
  • Wide Input Dynamic Power Management (DPM) Range
• Highest Battery Discharge Efficiency with 5-mΩ Battery MOSFET
• Default Charge Disabled
• Integrated ADC for System Monitor
  (Input, System and Battery Voltage, Temperature, Charge Current)
• Flexible Autonomous and I²C Mode for Optimal System Performance
• Remote Battery Sensing
• High Integration includes all MOSFETs, Current Sensing and Loop Compensation
• High Accuracy
  • ±0.5% Charge Voltage Regulation
  • ±5% Charge Current Regulation
  • ±7.5% Input Current Regulation
• Safety
  • Thermal Regulation and Thermal Shutdown
  • Input UVLO/Overvoltage Protection
  • Battery OVP
  • Safety Timer

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The bq25898C is a highly-integrated switch-mode battery charge management and system power path management device for single cell Li-Ion and Li-polymer battery. The device supports high input voltage for charging. The low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I2C serial interface with charging and system settings makes the device a truly flexible solution. The bq25898C is available in a 2.8mm x 2.5mm 42-ball DSBGA package.

The bq25898C is a highly-integrated 3-A switch-mode battery charge management device for single cell Li-Ion and Li-polymer battery. As a tiny and cost-effective device, it can also be configured as slave charger to provide fast charging in dual charger applications.

It features fast charging with high input voltage support for a wide range of smartphone, tablet and portable devices. Its low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The solution is highly integrated with input reverse-blocking FET (RBFET,Q1), high-side switching FET (HSFET, Q2), low-side switching FET (LSFET, Q3), and integrated charge current sensing. It also integrates the bootstrap diode for the high-side gate drive and battery monitor for simplified system design. The I2C serial interface with charging and system settings makes the device a truly flexible solution.

The device supports a wide range of input sources, including standard USB host port, USB charging port, and USB compliant adjustable high voltage adapter. To set the default input current limit, the device takes the result from detection circuit in the system, such as USB PHY device. The device is compliant with USB 2.0 and USB 3.0 power spec with input current and voltage regulation.

The default charge current is set to 0 mA (both fast charge and precharge disabled). Once charge is enabled, the device may initiate and complete a charging cycle with software control.

The charger provides various safety features for battery charging and system operations, charging safety timer and overvoltage/overcurrent protections. The thermal regulation reduces charge current when the junction temperature exceeds 120°C (programmable). The STAT output reports the charging status and any fault conditions. The PG output indicates if a good power source is present. The INT immediately notifies host when fault occurs.

The device is available in a 2.80 mm x 2.50 mm 42-ball DSBGA package.