BQ24618RGER

USB 友好型独立同步开关模式锂离子或锂聚合物电池充电器 24-VQFN -40 to 85

DESCRIPON

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