DESCRIPTION
●The bq24618 is highly integrated Li-ion or Li-polymer switch-mode battery charge controller. It 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.
●FEATURES
●• USB Friendly 4.7V-28V Input Operating Range
●• Stand-alone Charge Controller to Support 1-6 Li-Ion or Li-Polymer Battery Cells
●• Up-to 10A Charge Current and Adapter Current
●• 600 kHz NMOS-NMOS Synchronous Buck Converter
●• 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
●• Safety Protection
●– Input Over-Voltage Protection
●– Battery Thermistor Sense Hot/Cold Charge Suspend
●– Battery Detection
●– Reverse Protection Input FET
●– Programmable Safety Timer
●– Charge Over-Current Protection
●– Battery Short Protection
●– Battery Over-Voltage Protection
●– Thermal Shutdown
●• Status Outputs
●– Adapter Present
●– Charger Operation Status
●• Charge Enable Pin
●• 6V Gate Drive for Synchronous Buck Converter
●• 30ns Driver Dead-time and 99.5% Max Effective Duty Cycle
●• 24-pin, 4×4-mm2 QFN package
●• Energy Star Low Quiescent Current Iq
●– < 15 µA Off-State Battery Discharge current
●– < 1.5 mA Off-State Input Quiescent Current
●APPLICATIONS
●• Tablet PC
●• Smart Phones
●• Portable Media Players, Navigation Devices, Notebook and Ultra-Mobile PC
●• Personal Digital Assistants
●• Handheld Terminals
●• Industrial and Medical Equipment
