BQ24618数据手册集成电路（IC）的电池充电器规格书PDF

描述 Description

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.

特性 Features

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

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