• 90% High Efficiency Switch Mode 2-A Charger
• 3.9-V to 6.2-V Single Input USB-Compliant Charger with 6.4-V Over-Voltage Protection
  • Input voltage and current limit supports USB 2.0 and USB 3.0
  • Input Current Limit: 100 mA, 150 mA, 500 mA, 900 mA, 1 A, 1.5 A, 2 A
• USB OTG with Adjustable output 4.55 V to 5.5 V at 1 A or 1.5 A
  • Fast OTG Startup (22 ms Typical)
  • 90% 5-V Boost Mode Efficiency
  • Accurate ±15% Hiccup Mode Overcurrent Protection
• Narrow VDC (NVDC) Power Path Management
  • Instant System On with No Battery or Deeply Discharged Battery
  • Ideal Diode Operation in Battery Supplement Mode
• 1.5-MHz Switching Frequency for Low Profile 1.2-mm Inductor
• I2C port for optimal system performance and status reporting
• Autonomous Battery Charging with or without Host Management
  • Battery Charge Enable
  • Battery Charge Preconditioning
  • Charge Termination and Recharge
• High Accuracy
  • ±0.5% Charge Voltage Regulation
  • ±7% Charge Current Regulation
  • ±7.5% Input Current Regulation
  • ±3% Output Voltage Regulation in USB OTG Boost Mode
• High Integration
  • Power Path Management
  • Synchronous Switching MOSFETs
  • Integrated Current Sensing
  • Bootstrap Diode
  • Internal Loop Compensation
• Safety
  • Battery Temperature Sensing for Charging and Discharging in OTG Mode
  • Battery Charging Safety Timer
  • Thermal Regulation and Thermal Shutdown
  • Input and System Over-Voltage Protection
  • MOSFET Over-Current Protection
• Charge Status Outputs for LED or Host Processor
• Maximum power tracking capability by input voltage regulation
• 20-µA Low Battery Leakage Current and Support Shipping Mode
• 4-mm x 4-mm VQFN-24 Package

• Tablet PC, Smart Phone, Internet Devices
• Portable Audio Speaker

The bq24259 is a highly-integrated switch-mode battery charge management and system power path management device for 1 cell Li-Ion and Li-polymer battery in a wide range of smart phone and tablet applications. Its 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.