TP4054 是一款完整的单节锂离子电池采用恒定电流/恒定电压线性充电器.
其SOT 封装与较少的外部元件数目使得TP4054 成为便携式应用的理想选择.
TP4054 可以适合USB电源和适配器电源工作.由于采用了内部PMOSFET 架构,加上防倒充电路,所以不需要外部检测电阻器和隔离二极管.
热反馈可对充电电流进行调节,以便在大功率操作或高环境温度条件下对芯片温度加以限制.充电电压固定于4.2V,而充电电流可通过一个电阻器进行外部设置.
当充电电流在达到最终浮充电压之后降至设定值 1/10 时,TP4054 将自动终止充电循环.
当输入电压 (交流适配器或USB 电源)被拿掉时,TP4054 自动进入一个低电流状态,将电池漏电流降至2uA 以下.也可将TP4054 置于停机模式,
以而将供电电流降至5uA.TP4054 的其他特点包括充电电流监控器、欠压闭锁、自动再充电和一个用于指 示充电结束和输入电压接入的状态引脚.
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特点
•800mA 的可编程充电电流;
•无需MOSFET、检测电阻器或隔离二极管;
•用于单节锂离子电池、采用SOT23-5 封装的完整线性充电器;
•恒定电流/恒定电压操作,并具有可在无过热危险的情况下实现充电速率最大化的热调节功能;
•直接从USB 端口给单节锂离子电池充电;
•精度达到±1%的 4.2V 预设充电电压;
•用于电池电量检测的充电电流监控器输出;
•自动再充电;
•充电状态输出引脚;
•C/10 充电终止;
•待机模式下的供电电流为45uA;
•2.9V涓流充电器件版本;
•软启动限制了浪涌电流;
•采用5 引脚SOT-23 封装.
应用
•蜂窝电话、PDA、MP3播放器;
•充电座;
•蓝牙应用
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典型应用典型应用
400mA 单节锂离子电池充电器.
绝对最大额定值
•输入电源电压(Vcc):-0.3V~10V
•PROG:-0.3V~Vcc +0.3V
•BAT:-0.3V~7V
•CHRG:-0.3V~10V
•BAT 短路持续时间:连续
•BAT 引脚电流:800mA
•PROG 引脚电流:800uA
•最大结温:145℃
•工作环境温度范围:-40℃~85℃
•贮存温度范围:-65℃~125℃
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