API9221是Diodes公司推出的鋰離子/聚合物電池充電器IC，適用于需要USB和AC/DC電源適配器(qi)充電輸入的(de)各種手持設備。該(gai)款雙輸入IC支持USB 主機及DC適配器(qi)連接，可分別提供符合USB標準或高達1.2A的(de)充電電流。 

   為確保設備能夠支持各種OEM 及售后市場充電器，API9221 輸入可承受(shou)最大28V的電(dian)(dian)壓，因(yin)此降低(di)了對外部保(bao)護元件(jian)的需求(qiu)。當(dang)USB 輸入電(dian)(dian)壓高于5.4V 或DC適(shi)配器(qi)輸入電(dian)(dian)壓高于6.8V時，充(chong)電(dian)(dian)器(qi)會暫停充(chong)電(dian)(dian)以保(bao)護IC、電(dian)(dian)池及系統。該(gai)IC輸出(chu)還(huan)具有反向(xiang)電(dian)(dian)流保(bao)護。

   API9221采用(yong)旁(pang)路LDO 穩(wen)壓(ya)器(qi)，能夠(gou)讓主機控制器(qi)在(zai)檢測到充電(dian)器(qi)連接(jie)了不合(he)規格的電(dian)源電(dian)壓(ya)時安全(quan)保(bao)持充電(dian)器(qi)關斷，直至(zhi)連接(jie)到有(you)(you)效(xiao)電(dian)源后才重新運作(zuo)。該器(qi)件(jian)具有(you)(you)絕佳(jia)的熱調(diao)節及保(bao)護功能，可以降(jiang)低充電(dian)電(dian)流(liu)以確保(bao)片芯溫度在(zai)安全(quan)工作(zuo)范(fan)圍內。

  API9221符合業界標準CC/CV 充電(dian)(dian)(dian)算法，通過外部(bu)電(dian)(dian)(dian)阻(zu)器設(she)置(zhi)，用戶可配置(zhi)USB及適配器充電(dian)(dian)(dian)電(dian)(dian)(dian)流和結束充電(dian)(dian)(dian)電(dian)(dian)(dian)流。在(zai)器件工作溫度范圍內，該(gai)集成電(dian)(dian)(dian)路的(de)誤差率僅為 1%，可確保電(dian)(dian)(dian)池充電(dian)(dian)(dian)達到4.2V。