●The bq24618 device is highly integrated Li-ion or Li-polymer switched-mode battery-charge controller. The bq24618 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 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 low-quiescent 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
● 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 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
● Status Outputs
● Adapter Present
● Charger Operation Status
● Charge Enable Pin
● 6-V Gate Drive for Synchronous Buck Converter
● 30-ns Driver Dead-Time and 99.5% Maximum
●Effective Duty Cycle
● Energy Star Low Quiescent Current Iq
● < 15-µA Off-State Battery Discharge Current
● < 1.5-mA Off-State Input Quiescent Current
● APPLICATIONS
● Tablet PCs
● Smart Phones
● Portable Media Players, Navigation Devices,
●Notebooks and Ultra-Mobile PCs
● Personal Digital Assistants
● Handheld Terminals
● Industrial and Medical Equipment
●All other trademarks are the property of their respective owners
