描述 / Descriptions
BRCL4054BME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BRCL4054BME成为便携式应用的理想选择。BRCL4054BME可以适合USB电源 和适配器电源工作。 The BRCL4054BME 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 BRCL4054BME ideally suited for portable applications. Furthermore, the BRCL4054BME 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，BRCL4054BME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 BRCL4054BME 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，BRCL4054BME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BRCL4054BME置于停机模式，以而将供电电流降至25uA。 BRCL4054BME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 BRCL4054BME automatically enters a low current state, dropping the battery drain current to less than 2μA. The BRCL4054BME 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800mA的可编程充电电流 Programmable Charge Current Up to 800mA 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 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
¾ 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.
引脚排列 / Pinning
CHRG ____________ (引脚1):漏极开路充电状态输出。在电池的充电过程中，由一个内部N沟道MOSFET将CHRG引 脚拉至低电平。当充电循环结束时，一个约20uA的弱下拉电流源被连接至CHRG引脚，指示一个AC存 在状态。当BRCL4054BME检测到一个欠压闭锁条件时，CHRG引脚被强制为高阻抗状态。 CHRG ____________ (Pin 1): Open-Drain Charge Status Output. When the battery is charging, the CHRG __________ pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, a weak pull-down of approximately 20μA is connected to the CHRG __________ pin, indicating an “AC present” condition. When the BRCL4054BME detects an under voltage lockout condition, CHRG __________ is forced high impedance. GND (引脚2): 地。 GND (Pin 2)：Ground. BAT (引脚3):充电电流输出。该引脚向电池提供充电电流并将最终浮充电压调节至4.2V该引脚的一个精 准内部电阻分压器设定浮充电压，在停机模式中，该内部电阻分压器断开。 BAT (Pin 3):Charge Current Output. Provides charge current to the battery and regulates the final float voltage to 4.2V. An internal precision resistor divider from this pin sets the float voltage which is disconnected in shut down mode. VCC（引脚4）：正的输入电源电压。该引脚向充电器供电。VCC的变化范围在4.25V-6.5V之间，并应通 过至少一个1uF电容器进行旁路。当VCC降至BAT引脚电压的30mV以内，BRCL4054BME进入停机模式， 从而IBAT降至2uA以下。 VCC (Pin 4):Positive Input Supply Voltage. Provides power to the charger. VCC can range from 4.25V to 6.5V and should be bypassed with at least a 1μF capacitor. When VCC drops to within 30mV of the BAT pin voltage, the BRCL4054BME enters shutdown mode, dropping IBAT to less than 2μA.
PROG (引脚5): 充电电流设定，充电电流监控和停机引脚。在该引脚与地之间连接一个精度为1%的电 阻器PPRGO可以设定充电电流。当在恒定电流模式下进行充电时，该引脚的电压被维持在1V在所有的模 式中都可以利用该引脚上的电压来测算充电电流，公式为IBAT=（VPROG/RPROG）*1000. PROG引脚还可以用来关断充电器。将设定电阻器与地短接，内部一个3.0uA 电流将PROG引脚拉至高 电平。当该引脚的电压达到1.21V的停机门限电压时，充电器进入停机模式，充电停止且输入电源电流 降至25uA。该引脚还夹约2.4V，电流1.5mA，重新将RPROG与地相连将使充电器恢复正常操作状态。 PROG (Pin 5):Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is programmed by connecting a 1% resistor, RPROG, to ground. When charging in constant-current mode, this pin servos to 1V. In all modes, the voltage on this pin can be used to measure the charge current using the following formula: IBAT = (VPROG/RPROG)×1000. The PROG pin can also be used to shut down the charger. Disconnecting the program resistor from ground allows a 3μA current to pull the PROG pin high. When it reaches the 1.21V shutdown threshold voltage, the charger enters shutdown mode, charging stops and the input supply current drops to 25μA. This pin is also clamped to approximately 2.4V. Driving this pin to voltages beyond the clamp voltage will draw currents as high as 1.5mA. Reconnecting RPROG to ground will return the charger to normal operation.
