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电池管理 IC
电池充电器 IC

BQ24745

不推荐用于新设计

支持多种电池化学物质的 SMBus 最多 4 节电池 2 级降压电池充电器

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数据表
BQ24745 不推荐用于新设计
虽然我们会继续生产此产品供先前的设计使用，但不推荐在新设计中使用此产品。请考虑从这些替代产品中选择一款：
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功能与比较器件相似
BQ24725A 正在供货 具有 N 沟道功率 MOSFET 选择器的 SMBus 1 至 4 节降压电池充电控制器 This product is 1-4S Li+ Battery SBMus charger controller

BQ24745

不推荐用于新设计
数据表 立即订购

产品详情

Number of series cells 2, 3, 4 Charge current (max) (A) 10 Vin (max) (V) 24 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 24 Absolute max Vin (max) (V) 30 Control topology Switch-Mode Buck Control interface SMBus Features Power Path Vin (min) (V) 7 Rating Catalog Operating temperature range (°C) 0 to 0
Number of series cells 2, 3, 4 Charge current (max) (A) 10 Vin (max) (V) 24 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 24 Absolute max Vin (max) (V) 30 Control topology Switch-Mode Buck Control interface SMBus Features Power Path Vin (min) (V) 7 Rating Catalog Operating temperature range (°C) 0 to 0
VQFN (RHD) 28 25 mm² 5 x 5
  • NMOS-NMOS Synchronous Buck Converter with
    300-kHz Frequency and >95% Efficiency
  • 30-ns Minimum Driver Dead-Time and
    99.5% Maximum Effective Duty Cycle
  • High-Accuracy Voltage and Current Regulation
    • ±0.5% Charge Voltage Accuracy
    • ±3% Charge Current Accuracy
    • ±3% Adapter Current Accuracy
    • ±2% Input Current Sense Amp Accuracy
  • Integration
    • Input Current Comparator, With Adjustable
      Threshold and Hysteresis
    • Internal Soft-Start
  • Safety
    • Dynamic Power Management (DPM)
  • Up to 19.2-V Battery Voltage
  • 7-V–24-V AC/DC-Adapter Operating Range
  • Simplified SMBus Control Interface
    • Charge Voltage DAC (1.024 V–19.2 V)
    • Charge Current DAC (128 mA–8.064 A)
    • Adapter Current Limit DPM DAC
      (256 mA–11.008 A)
  • Status and Monitoring Outputs
    • AC/DC Adapter Present With
      Adjustable Voltage Threshold
    • Input Current Comparator With Adjustable
      Threshold and Hysteresis
    • Current Sense Amplifier for Current Drawn
      From Input Source
  • Charge Any Battery Chemistry: Li+, NiCd,
    NiMH, Lead Acid, Etc.
  • Charge Enable Pin
  • < 10-µA Battery Current With Adapter Removed
  • < 1-mA Input DCIN Current With Adapter
    Present and Charge Disabled
  • 28-Pin, 5-mm × 5-mm QFN Package
  • NMOS-NMOS Synchronous Buck Converter with
    300-kHz Frequency and >95% Efficiency
  • 30-ns Minimum Driver Dead-Time and
    99.5% Maximum Effective Duty Cycle
  • High-Accuracy Voltage and Current Regulation
    • ±0.5% Charge Voltage Accuracy
    • ±3% Charge Current Accuracy
    • ±3% Adapter Current Accuracy
    • ±2% Input Current Sense Amp Accuracy
  • Integration
    • Input Current Comparator, With Adjustable
      Threshold and Hysteresis
    • Internal Soft-Start
  • Safety
    • Dynamic Power Management (DPM)
  • Up to 19.2-V Battery Voltage
  • 7-V–24-V AC/DC-Adapter Operating Range
  • Simplified SMBus Control Interface
    • Charge Voltage DAC (1.024 V–19.2 V)
    • Charge Current DAC (128 mA–8.064 A)
    • Adapter Current Limit DPM DAC
      (256 mA–11.008 A)
  • Status and Monitoring Outputs
    • AC/DC Adapter Present With
      Adjustable Voltage Threshold
    • Input Current Comparator With Adjustable
      Threshold and Hysteresis
    • Current Sense Amplifier for Current Drawn
      From Input Source
  • Charge Any Battery Chemistry: Li+, NiCd,
    NiMH, Lead Acid, Etc.
  • Charge Enable Pin
  • < 10-µA Battery Current With Adapter Removed
  • < 1-mA Input DCIN Current With Adapter
    Present and Charge Disabled
  • 28-Pin, 5-mm × 5-mm QFN Package

The bq24745 is a high-efficiency, synchronous battery charger with an integrated input-current comparator, offering low component count for space-constrained, multi-chemistry battery-charging applications. The input-current, charge-current, and charge-voltage DACs allow very high regulation accuracies that can be easily programmed by the system power-management microcontroller using the SMBus interface. The bq24745 charges two, three, or four series Li+ cells, and is available in a 28-pin, 5-mm × 5 mm QFN package.

The bq24745 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 adaptor 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, allowing monitoring the overall system power. If the adapter current is above the programmed low-power threshold, a signal is sent to host so that the system optimizes its performance to the power available from the adapter. An integrated comparator monitors the input current through the current-sense amplifier, and indicates when the input current exceeds a programmable threshold limit.

The bq24745 is a high-efficiency, synchronous battery charger with an integrated input-current comparator, offering low component count for space-constrained, multi-chemistry battery-charging applications. The input-current, charge-current, and charge-voltage DACs allow very high regulation accuracies that can be easily programmed by the system power-management microcontroller using the SMBus interface. The bq24745 charges two, three, or four series Li+ cells, and is available in a 28-pin, 5-mm × 5 mm QFN package.

The bq24745 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 adaptor 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, allowing monitoring the overall system power. If the adapter current is above the programmed low-power threshold, a signal is sent to host so that the system optimizes its performance to the power available from the adapter. An integrated comparator monitors the input current through the current-sense amplifier, and indicates when the input current exceeds a programmable threshold limit.
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技术文档

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类型 标题 下载最新的英语版本 日期
* 数据表 SMBus-Controlled Multi-chemistry Battery Charger With Input Current 数据表 (Rev. D) 2011年 10月 5日
应用手册 How to Review a Multicell Switching Charger Schematic 2011年 9月 21日
更多文献资料 Журнал по применению аналоговых компонентов 1 кв. 2010 2010年 9月 23日
模拟设计期刊 符合 JEITA 标准的锂离子电池充电器解决方案 2010年 1月 29日

设计和开发

如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。

驱动程序或库

SLUC098 — bq24745 Driver (USB EV2300) Installer

支持的产品和硬件

支持的产品和硬件

产品
电池充电器 IC
BQ24745 — 支持多种电池化学物质的 SMBus 最多 4 节电池 2 级降压电池充电器
下载
支持软件

SLUC097 — bq24745EVSWv101

支持的产品和硬件

支持的产品和硬件

产品
电池充电器 IC
BQ24745 — 支持多种电池化学物质的 SMBus 最多 4 节电池 2 级降压电池充电器
下载
参考设计

PMP9668 — 24V 输入、10A 最高输出、双 USB 端口（5/12V 2A 和 5V 4A）通用微处理器控制电池充电器参考设计

BQ24745 是主机控制型同步降压电池充电器，正常情况下可以最高 19.2V 的电压和 8A 的电流进行电池充电，如果使用 8 mOhm 电池感应电阻器，电流可以提高到 10A。该传动系统在纯对流冷却条件下提供 8A，在中等风扇冷却 (~200 LFM) 条件下提供 10A。测试报告包含两种情况的热感图像。虽然设计中显示的主机为 28 引脚 MSP430，任何有 SMBus 功能的处理器都可以使用。提供使用 TPS54335 的 5/12V 2A 辅助转换器，使用带 2 个 CSD18504 的 TPS40170 时，可提供 5V 4A。该设计为两个 USB 端口提供用于电源开关的 (...)
测试报告: PDF
原理图: PDF
封装 引脚 下载
VQFN (RHD) 28 查看选项
应遵守 TI 评估类商品的标准条款与条件。

订购和质量

包含信息：
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
包含信息：
  • 制造厂地点
  • 封装厂地点

支持和培训

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