TI BQ24618RGER

The bq24618 device is highly integrated Li-ion or Lipolymer switched-mode battery-charge controller. The bq24618 offers a constant-frequency synchronous switching PWM controller with highaccuracy charge current and voltage regulation, charge preconditioning, termination, adapter current regulation and charge status monitoring. The bq24618 operates from either a USB port or AC adapter and supports charge currents up to 10 A. The device 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 for charge termination. The bq24618 automatically restarts the charge cycle if the battery voltage falls below an internal threshold, and enters a lowquiescent current sleep mode when the input voltage falls below the battery voltage.

• USB-Friendly 4.7-V to 28-V Input Operating Range
• Stand-Alone Charge Controller to Support 1 to 6 Li-Ion or Li-Polymer Battery Cells
• Up to 10-A Charge Current and Adapter Current
• 600-kHz NMOS-NMOS Synchronous Buck Converter
• ±0.5% Charge Voltage Accuracy ±3% Charge Current Accuracy ±3% Adapter Current Accuracy
• Automatic System Power Selection From Adapter or Battery
• Internal Loop Compensation
• Internal Soft Start
• Dynamic Power Management
• Input Overvoltage Protection
• Battery Thermistor Sense Hot/Cold Charge Suspend
• Battery Detection
• Reverse-Protection Input FET
• Programmable Safety Timer
• Charge Overcurrent Protection
• Battery Short Protection
• Battery Overvoltage Protection
• Thermal Shutdown
• Adapter Present Charger Operation Status
• Charge Enable Pin
• 6-V Gate Drive for Synchronous Buck Converter
• 30-ns Driver Dead-Time and 99.5% Maximum Effective Duty Cycle
• Energy Star Low Quiescent Current Io
• <15μA Off-State Battery Discharge Current
• <1.5 mA Off-State Input Quiescent Current

• Tablet PCs
• Smart Phones
• Portable Media Players
• Navigation Devices
• Notebooks
• Ultra-Mobile PCs
• Personal Digital Assistants
• Handheld Terminals
• Industrial and Medical Equipment