BQ25300 是一款高度集成的独立型开关模式电池充电器，适用于 1 节锂离子和锂聚合物和磷酸铁锂电池。BQ25300 支持 4.1V 至 17V 输入电压和 3A 快速充电电流。该器件的集成电流感应拓扑可实现高充电效率和低 BOM 成本。此器件具有出色的 200nA 低静态电流，可节省电池电量并更大限度地延长便携式设备的存放时间。BQ25300 采用 3x3 WQFN 封装，适用于 2 层布局和空间有限的应用。

The BQ25300supports 4.1-V to 17-V input to charge single cell batteries. The BQ25300provides up to 3-A continuous charge current to a single cell 1S battery The device features fast charging for portable devices. Its input voltage regulation delivers maximum charging power to the battery from input source. The solution is highly integrated with an input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), and low-side switching FET (LSFET, Q3).

The BQ25300 features lossless integrated current sensing to reduce power loss and BOM cost with minimized component count. It also integrates a bootstrap diode for the high-side gate drive and battery temperature monitor to simplify system design. The device initiates and completes a charging cycle without host control. The BQ25300 charge voltage and charge current are set by external resistors. The BQ25300detects the charge voltage setting at startup and charges the battery in four phases: battery short, pre-conditioning, constant current, and constant voltage. At the end of the charging cycle, the charger automatically terminates if the charge current is below the termination current threshold and the battery voltage is above the recharge threshold. When the battery voltage falls below the recharge threshold, the charger will automatically start another charging cycle. The charger provides various safety features for battery charging and system operations, including battery temperature monitoring based on negative temperature coefficient (NTC) thermistor, charge safety timer, input over-voltage and over-current protections, as well as battery over-voltage protection. Pin open and short protection is also built in to protect against the charge current setting pin ICHG accidently open or short to GND. The thermal regulation regulates charge current to limit die temperature during high power operation or high ambient temperature conditions.

The STAT pin output reports charging status and fault conditions. When the input voltage is removed, the device automatically enters HiZ mode with very low leakage current from battery to the charger device. The BQ25300 is available in a 3 mm x 3 mm thin WQFN package.

• 独立充电器且易于配置
• 高效 1.2MHz 同步开关模式降压充电器
  • 1 节电池 5V 输入、2A 电流时的充电效率为 92.5%
  • 1 节电池 9V 输入、2A 电流时的充电效率为 91.8%
• 单个输入，支持 USB 输入和高电压适配器
  • 支持 4.1V 至 17V 输入电压范围，绝对最大输入电压额定值为 28V
  • 输入电压动态电源管理 (VINDPM) 跟踪电池电压
• 高度集成
  • 集成反向阻断和同步开关 MOSFET
  • 内部输入和充电电流感应
  • 内部环路补偿
  • 集成式自举二极管
• 3.6V/4.05V/4.15V/4.2V 充电电压
• 3.0A 最大快速充电电流
• 4.5V VBAT 下的 200nA 低电池泄漏电流
• IC 禁用模式下的 4.25μA VBUS 电源电流
• 120°C 时充电电流热调节
• 预充电电流：快速充电电流的 10%
• 终止电流：快速充电电流的 10%
• 充电精度
  • 充电电压调节范围为 ±0.5%
  • 充电电流调节范围为 ±10%
• 安全
  • 热调节和热关断
  • 输入欠压锁定 (UVLO) 和过压保护 (OVP)
  • 电池过充保护
  • 预充电和快速充电安全计时器
  • 如果电流设置引脚 ICHG 开路或短路，则充电被禁用
  • 冷/热电池温度保护
  • 关于 STAT 引脚的故障报告
• 采用 WQFN 3x3-16 封装

• Number of series cells
• 1
• Charge current (Max) (A)
• 3
• Operating Vin (Max) (V)
• 17
• Cell chemistry
• Li-Ion/Li-Polymer
• Battery charge voltage (Min) (V)
• 4.1
• Battery charge voltage (Max) (V)
• 4.4
• Absolute Vin (safety rating) (Max) ((V))
• 28
• Control interface
• Standalone (RC-Settable)
• Features
• BAT temp thermistor monitoring (hot/cold profile)
• Operating Vin (Min) (V)
• 4
• Rating
• Catalog

BQ25300的完整型号有：BQ25300RTER，以下是这些产品的关键参数及官网采购报价：

BQ25300RTER，工作温度：-40 to 85，封装：WQFN (RTE)-16，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ25300RTER的批量USD价格：.7（1000+）

BQ25300EVM — 独立型 1 节、17V、3A、降压电池充电器评估模块

The BQ25300EVM evaluation module (EVM) is used to evaluate the BQ25300 device. This is a highly integrated 3-A standalone 1-cell, 17-V, 1.2-MHz synchronous switch mode buck battery charger.