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電源適配器充電輸入的(de)各種手持設備。該款雙輸入IC支持USB 主(zhu)機及DC適配器連接，可分別提供符合USB標(biao)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(shu)入(ru)可承受(shou)最大28V的(de)電(dian)壓，因(yin)此降低了對外部保(bao)護(hu)元件的(de)需求。當USB 輸(shu)入(ru)電(dian)壓高于5.4V 或DC適配器(qi)輸(shu)入(ru)電(dian)壓高于6.8V時，充電(dian)器(qi)會暫(zan)停充電(dian)以保(bao)護(hu)IC、電(dian)池及系統。該IC輸(shu)出還(huan)具有反(fan)向電(dian)流(liu)保(bao)護(hu)。

   API9221采用旁路(lu)LDO 穩壓(ya)器(qi)(qi)，能夠讓主機控制器(qi)(qi)在檢測到充電(dian)器(qi)(qi)連(lian)(lian)接了不合規(gui)格的電(dian)源電(dian)壓(ya)時(shi)安(an)全保持充電(dian)器(qi)(qi)關斷，直至連(lian)(lian)接到有效電(dian)源后才重新運(yun)作。該器(qi)(qi)件具有絕佳的熱調節及保護功能，可以降低充電(dian)電(dian)流以確保片芯溫度在安(an)全工作范圍內(nei)。

  API9221符合業界標準CC/CV 充(chong)電(dian)(dian)(dian)(dian)算法，通過(guo)外部電(dian)(dian)(dian)(dian)阻器(qi)設置，用戶可配置USB及適配器(qi)充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流和結束充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流。在器(qi)件(jian)工作溫度范圍(wei)內(nei)，該集成電(dian)(dian)(dian)(dian)路(lu)的誤(wu)差率僅為 1%，可確保電(dian)(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)(dian)達到4.2V。