描述 / Descriptions
少的外部元件数目使得BRCL4054CME成为便携式应用的理想选择。BRCL4054CME可以适合USB电源
和适配器电源工作。
The BRCL4054CME is a complete constant-current/constant voltage linear charger for single cell
lithium-ion batteries. Its Thin SOT package and low external component count make the
BRCL4054CME ideally suited for portable applications. Furthermore, the BRCL4054CME is
specifically designed to work within USB power specifications.
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，BRCL4054CME将自动终止充电循环。
No external sense resistor is needed, and no blocking diode is required due to the internal
MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature
during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the
charge current can be programmed externally with a single resistor. The BRCL4054CME
automatically terminates the charge cycle when the charge current drops to 1/10th the programmed
value after the final float voltage is reached.
当输入电压（交流适配器或USB电源）被拿掉时，BRCL4054CME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BRCL4054CME置于停机模式，以而将供电电流降至25uA。
BRCL4054CME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。
When the input supply (wall adapter or USB supply) is removed, the BRCL4054CME automatically
enters a low current state, dropping the battery drain current to less than 2μA. The BRCL4054CME
can be put into shutdown mode, reducing the supply current to 25μA. Other features include charge
current monitor, under voltage lockout, automatic recharge and a status pin to indicate charge
termination and the presence of an input voltage.
特征 / Features
¾ 高达500mA的可编程充电电流
Programmable Charge Current Up to 500mA
¾ 无需MOSFET、检测电阻器或隔离二极管
No MOSFET, Sense Resistor or Blocking Diode Required
¾ 用于单节锂离子电池、采用SOT23-5封装的完整线性充电器
¾ Complete Linear Charger in 5-Lead SOT-23 Package for Single Cell Lithium-Ion Batteries
¾ 恒定电流/恒定电压操作，并具有热调节功能
Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate
Without Risk of Overheating
¾ 直接从USB端口给单节锂离子电池充电
Charges Single Cell Li-Ion Batteries Directly from USB Port
¾ 4.2V预设充电电压
Preset 4.2V Charge Voltage with ±1% Accuracy
¾ 用于电池电量检测的充电电流监控器输出
Charge Current Monitor Output for Gas Gauging
¾ 自动再充电
Automatic Recharge
¾ 充电状态输出引脚
Charge Status Output Pin
¾ C/10充电终止
C/10 Charge Termination
¾ 待机模式下的供电电流为25μA
25μA Supply Current in Shutdown
¾ 2.9V涓流充电器件版本
2.9V Trickle Charge Threshold
¾ 软启动限制了浪涌电流
Soft-Start Limits Inrush Current
¾ 单灯使用时，充满后灯全灭。
When using a single lamp, the light is completely extinguished after fully charging..
¾ 无卤产品。
Halogen-free Product.
用途 / Applications
蜂窝电话、PDA、MP3播放器；
Cellular Telephones, PDAs, MP3 Players
¾ 充电座
Charging Docks and Cradles
¾ 蓝牙应用
Bluetooth Applications.
