研諾邏輯科技有限公司(si)(AnalogicTech)宣布推出(chu)AAT3783，一款帶有內(nei)置(zhi)過壓保護(hu)（OVP）開關的(de)1A線性鋰(li)離子(zi)/聚(ju)合物(wu)電(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)(dian)(dian)芯片。該款充(chong)(chong)電(dian)(dian)(dian)(dian)芯片可通過交流輸(shu)入或USB輸(shu)入對4.2V鋰(li)離子(zi)/聚(ju)合物(wu)電(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)(dian)(dian)，同(tong)時還(huan)帶有數字式(shi)熱管理(li)系統，可將充(chong)(chong)電(dian)(dian)(dian)(dian)效率最大化并且減少電(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)(dian)(dian)時間。

　　“當前許多蜂窩式手機、藍牙耳機、MP3播放器等等便攜系統的制造商需要過壓保護功能，以便預防錯誤輸入電壓對電池或系統的損害，”研諾邏輯產品線總監 Siamak Bastami說道。“通過內置1個隔離了的OVP開關，AAT3783鋰離子/聚合物電池充電器提供的保護功能，可防止高(gao)達28V的單(dan)點失效電(dian)壓，同時可減少元器件數量(liang)并將設計簡化。”

　　充電效率的最大(da)化

　　AAT3783在(zai)同(tong)一片芯上集成了(le)1個充電(dian)裝置，1個反向阻斷二極(ji)管和電(dian)流傳感電(dian)路。其(qi)運行輸入電(dian)壓范圍是4.0V 到(dao) 7.5V，可(ke)提供100 mA 到(dao) 1A的可(ke)編程電(dian)流。

　　為了(le)在所有(you)運行(xing)條件下將(jiang)(jiang)充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流最大(da)化，AAT3783帶有(you)1個特殊的(de)數(shu)字式熱(re)管理系(xi)統(tong)，用(yong)以測量內部片(pian)芯(xin)的(de)溫(wen)度(du)以及當該器(qi)件超(chao)過預設限制(zhi)(zhi)時(shi)降(jiang)低快速(su)充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流。這(zhe)一熱(re)環路控制(zhi)(zhi)不斷(duan)地對(dui)電(dian)(dian)(dian)(dian)路片(pian)芯(xin)的(de)溫(wen)度(du)進(jin)行(xing)測試，對(dui)快速(su)充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流進(jin)行(xing)調高、降(jiang)低小步調節以達到均(jun)衡電(dian)(dian)(dian)(dian)流。由于熱(re)環路控制(zhi)(zhi)系(xi)統(tong)充電(dian)(dian)(dian)(dian)水(shui)(shui)平(ping)，通過在快速(su)充電(dian)(dian)(dian)(dian)模式下保證采用(yong)最高水(shui)(shui)平(ping)恒定(ding)電(dian)(dian)(dian)(dian)流，盡可能在任(ren)何特定(ding)外(wai)圍溫(wen)度(du)條件下將(jiang)(jiang)充電(dian)(dian)(dian)(dian)效率(lv)最大(da)化。

　　AAT3783還具有過(guo)壓、過(guo)流、短路(lu)和超溫電(dian)路(lu)功能，當出(chu)現故障時(shi)，通過(guo)關閉(bi)系(xi)統可自動保護充(chong)電(dian)設備、控制系(xi)統和充(chong)電(dian)狀(zhuang)(zhuang)態(tai)下(xia)的電(dian)池。AAT3783還提(ti)供1個(ge)狀(zhuang)(zhuang)態(tai)檢(jian)測輸出(chu)引(yin)腳，可通過(guo)直(zhi)接驅動1個(ge)外(wai)部LED來顯示(shi)電(dian)池充(chong)電(dian)狀(zhuang)(zhuang)態(tai)。

　　價格與供貨

　　AAT3783的(de)額定工(gong)作溫度范(fan)圍(wei)是-40至+85℃。它采用無鉛、16引腳TDFN封裝，訂貨(huo)量為(wei)1000片(pian)時每片(pian)單(dan)價為(wei)0.95美元。