BQ24705中文资料具有低输入电源检测功能的主机控制型多化合物电池充电器数据手册TI规格书

描述 Description

The bq24705 is a high-efficiency, synchronous battery charger with integrated compensation, offering low component count for space-limited multi-chemistry battery charging applications. Charge current and voltage programming allows high regulation accuracies, and can be either hardwired with resistors, or programmed by the system power-management microcontroller using a DAC or GPIOs.The bq24705 charges two, three, or four series Li+ cells, supporting up to 8 A of charge current, and is available in a 24-pin, 4x4-mm thin QFN package. The bq24705 features Dynamic Power Management (DPM) and input power limiting. These features reduce battery charge current when the input power limit is reached to avoid overloading the AC adapter when supplying the load and the battery charger simultaneously. A highly-accurate current-sense amplifier enables precise measurement of input current from the AC adapter to monitor the overall system power.

特性 Features

• NMOS-NMOS Synchronous Buck Converter with 600 kHz Frequency and >95% Efficiency
• High-Accuracy Voltage and Current Regulation
• ±3% Charge Current Accuracy
• ±2% Input Current Sense Amp Accuracy
• Integration
• Internal Soft-Start
• Safety
• Dynamic Power Management (DPM) with Status Indicator
• Supports Two, Three, or Four Li+ Cells
• Analog Inputs with Ratiometric Programming via Resistors or DAC/GPIO Host Control
• Charge Current (up to 8 A, with 10-m Sense Resistor)
• Status and Monitoring Outputs
• DPM Loop Active (DPMDET)
• Supports Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.
• 10-µA Off-State Battery Current
• APPLICATIONS
• Portable Data-Capture Terminals
• Medical Diagnostics Equipment
• Battery Back-Up Systems