描述 / Descriptions
BRCL4054CME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BRCL4054CME成為便攜式應用的理想選擇。BRCL4054CME可以適合USB電源 和適配器電源工作。 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，BRCL4054CME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 BRCL4054CME 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，BRCL4054CME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BRCL4054CME置于停機模式，以而將供電電流降至25uA。 BRCL4054CME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 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.