BQ25300中文资料独立型单节、17V、3.0A 电池充电器数据手册TI规格书

描述 Description

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.

特性 Features

• 独立充电器且易于配置
• 1 节电池 5V 输入、2A 电流时的充电效率为 92.5%
• 单个输入，支持 USB 输入和高电压适配器
• 输入电压动态电源管理 (VINDPM) 跟踪电池电压
• 高度集成
• 内部输入和充电电流感应
• 集成式自举二极管
• 3.6V/4.05V/4.15V/4.2V 充电电压
• 4.5V VBAT 下的 200nA 低电池泄漏电流
• 120°C 时充电电流热调节
• 终止电流：快速充电电流的 10%
• 充电电压调节范围为 ±0.5%
• 安全
• 输入欠压锁定 (UVLO) 和过压保护 (OVP)
• 预充电和快速充电安全计时器
• 冷/热电池温度保护
• 采用 WQFN 3x3-16 封装