• 300-kHz NMOS-NMOS Synchronous Buck Converter
• Stand-Alone Charger Specifically for Lithium Phosphate
• 5-V–28-V VCC Input Operating Range, Supports 1–7 Battery Cells
• High-Accuracy Voltage and Current Regulation
  • ±0.5% Charge Voltage Accuracy
  • ±3% Charge Current Accuracy
  • ±3% Adapter Current Accuracy
• Integration
  • Automatic System Power Selection From Adapter or Battery
  • Internal Loop Compensation
  • Internal Soft Start
  • Dynamic Power Management (DPM)
• Safety Protection
  • Input Overvoltage Protection
  • Battery Thermistor Sense Suspend Charge at Hot/Cold and Automatically ICHARGE/8 at Hot/Cold or Warm/Cool
  • Battery Detection
  • Reverse Protection Input FET
  • Programmable Safety Timer
  • Charge Overcurrent Protection
  • Battery Short Protection
  • Battery Overvoltage Protection
  • Thermal Shutdown
• Status Outputs
  • Adapter Present
  • Charger Operation Status
• Charge Enable Pin
• 6-V Gate Drive for Synchronous Buck Converter
• 30-ns Driver Dead Time and 99.95% Max. Effective Duty Cycle
• 24-Pin 4-mm × 4-mm QFN Package
• Energy Star Low Quiescent Current Iq
  • < 15-μA Off-State Battery Discharge Current
  • < 1.5-mA Off-State Input Quiescent Current

• Power Tool and Portable Equipment
• Personal Digital Assistants
• Handheld Terminals
• Industrial and Medical Equipment
• Netbook, Mobile Internet Device, and Ultra-Mobile PC

The bq24630 is a highly integrated lithium phosphate switched-mode battery charge controller. The device offers a constant-frequency synchronous switching PWM controller with high-accuracy charge current and voltage regulation, charge preconditioning, termination, adapter current regulation, and charge status monitoring.

The bq24630 charges the battery in three phases: preconditioning, constant current, and constant voltage. Charge is terminated when the current reaches a minimum user-selectable level. A programmable charge timer provides a safety backup. The bq24630 automatically restarts the charge cycle if the battery voltage falls below an internal threshold and enters a low quiescent current sleep mode when the input voltage falls below the battery voltage.