BQ24108

采用 QFN 封装且具有 2A FET 的独立 bqSWITCHERTM 异步开关模式锂离子充电器

The bqSWITCHER™ series are highly integrated Li-ion and Li-polymer switch-mode charge management devices targeted at a wide range of portable applications. The bqSWITCHER™ series offers integrated synchronous PWM controller and power FETs, high-accuracy current and voltage regulation, charge preconditioning, charge status, and charge termination, in a small, thermally enhanced VQFN package. The system-controlled version provides additional inputs for full charge management under system control.

The bqSWITCHER™ charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on user- selectable minimum current level. A programmable charge timer provides a safety backup for charge termination. The bqSWITCHER™ automatically restarts the charge cycle if the battery voltage falls below an internal threshold. The bqSWITCHER™ automatically enters sleep mode when VCC supply is removed.

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Ideal For Highly Efficient Charger Designs For

Single-, Two-, or Three-Cell Li-Ion and Li-Polymer

Battery Packs

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bq24105 Also for LiFePO4 Battery see _Using

bq24105 to Charge the LiFePO4 Battery_

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Integrated Synchronous Fixed-Frequency PWM

Controller Operating at 1.1 MHz With 0% to 100%

Duty Cycle

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Integrated Power FETs for Up To 2-A Charge

Rate

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High-Accuracy Voltage and Current Regulation

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Available in Both Stand-Alone Built-In Charge

Management and Control and System-Controlled

Under System Command Versions

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Status Outputs for LED or Host Processor

Interface Indicates Charge-In-Progress, Charge

Completion, Fault, and AC-Adapter Present

Conditions

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20-V Maximum Voltage Rating on IN and OUT

Pins

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High-Side Battery Current Sensing

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Battery Temperature Monitoring

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Automatic Sleep Mode for Low Power

Consumption

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System-Controlled Version Can Be Used in NiMH

and NiCd Applications

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Reverse Leakage Protection Prevents Battery

Drainage

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Thermal Shutdown and Protection

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Built-In Battery Detection

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Available in 20-Pin, 3.50 mm × 4.50 mm VQFN

Package

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APPLICA ONS

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Handheld Products

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Portable Media Players

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Industrial and Medical Equipment

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Portable Equipment

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