描述 / Descriptions
BRCL4054BME是一款完整的單節鋰離子電池采用恒定電流/恒定電壓線性充電器。其SOT封裝與較 少的外部元件數目使得BRCL4054BME成為便攜式應用的理想選擇。BRCL4054BME可以適合USB電源 和適配器電源工作。 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. 由于采用了內部PMOSFET架構，加上防倒充電路，所以不需要外部檢測電阻器和隔離二極管。熱反 饋可對充電電流進行調節，以便在大功率操作或高環境溫度條件下對芯片溫度加以限制。充電電壓固定 于4.2V，而充電電流可通過一個電阻器進行外部設置當充電電流在達到最終浮充電壓之后降至設定值 1/10時，BRCL4054BME將自動終止充電循環。 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. 當輸入電壓（交流適配器或USB電源）被拿掉時，BRCL4054BME自動進入一個低電流狀態，將電池 漏電流降至2uA以下。也可將BRCL4054BME置于停機模式，以而將供電電流降至25uA。 BRCL4054BME的其他特點包括充電電流監控器、欠壓閉鎖、自動再充電和一個用于指示充電結束和輸 入電壓接入的狀態引腳。 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 高達800mA的可編程充電電流 Programmable Charge Current Up to 800mA ¾ 無需MOSFET、檢測電阻器或隔離二極管 No MOSFET, Sense Resistor or Blocking Diode Required ¾ 用于單節鋰離子電池、采用SOT23-5封裝的完整線性充電器 ¾ Complete Linear Charger in 5-Lead SOT-23 Package for Single Cell Lithium-Ion Batteries ¾ 恒定電流/恒定電壓操作，并具有熱調節功能 Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating ¾ 直接從USB端口給單節鋰離子電池充電 Charges Single Cell Li-Ion Batteries Directly from USB Port ¾ 4.2V預設充電電壓 Preset 4.2V Charge Voltage with ±1% Accuracy ¾ 用于電池電量檢測的充電電流監控器輸出 Charge Current Monitor Output for Gas Gauging ¾ 自動再充電 Automatic Recharge 充電狀態輸出引腳 Charge Status Output Pin ¾ C/10充電終止 C/10 Charge Termination ¾ 待機模式下的供電電流為25μA 25μA Supply Current in Shutdown ¾ 2.9V涓流充電器件版本 2.9V Trickle Charge Threshold ¾ 軟啟動限制了浪涌電流 Soft-Start Limits Inrush Current ¾ 單燈使用時，充滿后燈全滅。 When using a single lamp, the light is completely extinguished after fully charging.. ¾ 無鹵產品。 Halogen-free Product.

用途 / Applications
¾ 蜂窩電話、PDA、MP3播放器； Cellular Telephones, PDAs, MP3 Players ¾ 充電座 Charging Docks and Cradles ¾ 藍牙應用 Bluetooth Applications.

引腳排列 / Pinning
CHRG ____________ (引腳1):漏極開路充電狀態輸出。在電池的充電過程中，由一個內部N溝道MOSFET將CHRG引 腳拉至低電平。當充電循環結束時，一個約20uA的弱下拉電流源被連接至CHRG引腳，指示一個AC存 在狀態。當BRCL4054BME檢測到一個欠壓閉鎖條件時，CHRG引腳被強制為高阻抗狀態。 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 (引腳2): 地。 GND (Pin 2)：Ground. BAT (引腳3):充電電流輸出。該引腳向電池提供充電電流并將最終浮充電壓調節至4.2V該引腳的一個精 準內部電阻分壓器設定浮充電壓，在停機模式中，該內部電阻分壓器斷開。 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（引腳4）：正的輸入電源電壓。該引腳向充電器供電。VCC的變化范圍在4.25V-6.5V之間，并應通 過至少一個1uF電容器進行旁路。當VCC降至BAT引腳電壓的30mV以內，BRCL4054BME進入停機模式， 從而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 (引腳5): 充電電流設定，充電電流監控和停機引腳。在該引腳與地之間連接一個精度為1%的電 阻器PPRGO可以設定充電電流。當在恒定電流模式下進行充電時，該引腳的電壓被維持在1V在所有的模 式中都可以利用該引腳上的電壓來測算充電電流，公式為IBAT=（VPROG/RPROG）*1000. PROG引腳還可以用來關斷充電器。將設定電阻器與地短接，內部一個3.0uA 電流將PROG引腳拉至高 電平。當該引腳的電壓達到1.21V的停機門限電壓時，充電器進入停機模式，充電停止且輸入電源電流 降至25uA。該引腳還夾約2.4V，電流1.5mA，重新將RPROG與地相連將使充電器恢復正常操作狀態。 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.