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BQ24618 데이터시트 - Texas Instruments

부품번호상세내용제조사
BQ24618 Stand-Alone USB-Friendly Synchronous Switch-Mode Li-Ion or Li-Polymer Battery Charger with System Power Selector and Low Iq TI
Texas Instruments TI
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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.

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
   – < 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

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