• Integrated Power MOSFETs, NMOS-NMOS, Synchronous Buck Converter
• >95% Efficiency
• Frequency 700kHz Allows Smaller Inductor (5 mm x 5 mm)
• Thermal Regulation Loop for Safety, Limit TJ = 120°C
• Adaptive Driver Dead-time and 99.5% Maximum Effective Duty Cycle
• High-Accuracy Voltage and Current Regulation
  • ±0.5% Charge Voltage Accuracy
  • ±3% Charge Current Accuracy
  • ±3% Adapter Current Accuracy
  • ±2% Input Current Sense Amp Accuracy
• Integration
  • Integrated Power MOSFETs
  • Input Current Comparator
  • Internal Soft-Start
• Safety
  • Thermal Regulation Loop and Thermal Shutdown
  • Dynamic Power Management (DPM)
  • Power FETs Over Current Protection
• 7 V–24 V AC/DC-Adapter Operating Range
• Simplified SMBus Control
  • Charge Voltage DAC (1.024 V–19.2 V)
  • Charge Current DAC (128 mA–8.064 A)
  • Adapter Current Limit DPM DAC (256 mA–11.008 A)
• Status and Monitoring Outputs
  • AC/DC Adapter Present With Adjustable Voltage Threshold
  • Input Current Comparator, With Adjustable Threshold and Hysteresis
  • Current Sense Amplifier for Current Drawn From Input Source
• Charge Any Battery Chemistry: Li+, LiFePO4, NiCd, NiMH, Lead Acid (2, 3, and 4 Li-Ion Cells)
• Charge Enable Pin (CE)
• Energy Star Low Iq
  • < 10-μA Battery Current with Adapter Removed
  • < 1 mA Input DCINA Current When Adapter Present and Charge Disabled
• 34-pin, 3.50 mm × 7.00 mm QFN Package

• Notebook and Ultra-Mobile Computers
• Portable Data-Capture Terminals
• Portable Printers
• Medical Diagnostics Equipment
• Battery Bay Chargers
• Battery Back-up Systems

The bq24765 is a high-efficiency, synchronous battery charger with two integrated 30-mΩ NMOS power MOSFETs, and an integrated input current comparator, offering low component count for space-constraint, multi-chemistry battery charging applications. Input current, charge current, and charge voltage DACs allow for very high regulation accuracies that can be easily programmed by the system power management micro-controller using SMBus. The bq24765 has switching frequency of 700 kHz. The bq24765 charges 2, 3, or 4 series Li+ cells, and is available in a 34-pin, 3.50 mm x 7.00 mm VQFN package.

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