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
