研(yan)諾邏輯科技(ji)有(you)限公司(AnalogicTech)宣(xuan)布推出AAT3783，一款帶有(you)內置(zhi)過(guo)壓(ya)保護（OVP）開關的1A線性鋰(li)離子/聚(ju)合物電(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)芯片(pian)。該(gai)款充(chong)(chong)電(dian)(dian)芯片(pian)可通過(guo)交(jiao)流輸(shu)入或USB輸(shu)入對4.2V鋰(li)離子/聚(ju)合物電(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)，同時還帶有(you)數字(zi)式(shi)熱(re)管(guan)理系統，可將(jiang)充(chong)(chong)電(dian)(dian)效(xiao)率(lv)最大化(hua)并且(qie)減少(shao)電(dian)(dian)池(chi)充(chong)(chong)電(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(ti)供的(de)(de)保護功(gong)能，可(ke)防(fang)止高(gao)達28V的(de)(de)單點失效電壓(ya)，同時(shi)可(ke)減少元器件數量并將設計簡(jian)化。”

　　充電效率的最大化

　　AAT3783在同(tong)一(yi)片(pian)芯上集成了1個充電(dian)裝置，1個反向(xiang)阻斷二極管和(he)電(dian)流傳感電(dian)路。其(qi)運行輸入電(dian)壓范(fan)圍是4.0V 到(dao) 7.5V，可提供100 mA 到(dao) 1A的(de)可編程(cheng)電(dian)流。

　　為了在所有運行條(tiao)件(jian)下(xia)將(jiang)充電(dian)(dian)(dian)電(dian)(dian)(dian)流(liu)最大(da)化，AAT3783帶有1個特殊的數字式熱(re)管理系統，用(yong)以測量內部片芯的溫(wen)度以及(ji)當該器(qi)件(jian)超(chao)過預設限(xian)制(zhi)時(shi)降(jiang)低快(kuai)速(su)充電(dian)(dian)(dian)電(dian)(dian)(dian)流(liu)。這一熱(re)環(huan)路控(kong)制(zhi)不斷地對(dui)電(dian)(dian)(dian)路片芯的溫(wen)度進行測試，對(dui)快(kuai)速(su)充電(dian)(dian)(dian)電(dian)(dian)(dian)流(liu)進行調(diao)高、降(jiang)低小步調(diao)節以達(da)到均衡電(dian)(dian)(dian)流(liu)。由(you)于熱(re)環(huan)路控(kong)制(zhi)系統充電(dian)(dian)(dian)水平，通過在快(kuai)速(su)充電(dian)(dian)(dian)模式下(xia)保證采(cai)用(yong)最高水平恒定(ding)電(dian)(dian)(dian)流(liu)，盡可能在任何特定(ding)外(wai)圍溫(wen)度條(tiao)件(jian)下(xia)將(jiang)充電(dian)(dian)(dian)效率最大(da)化。

　　AAT3783還(huan)具有(you)過(guo)壓、過(guo)流、短路和(he)超溫(wen)電(dian)(dian)路功(gong)能(neng)，當(dang)出(chu)(chu)現故(gu)障時，通過(guo)關(guan)閉系統可(ke)自動(dong)保護充(chong)電(dian)(dian)設備(bei)、控制系統和(he)充(chong)電(dian)(dian)狀態下的(de)電(dian)(dian)池(chi)。AAT3783還(huan)提供1個(ge)狀態檢(jian)測輸出(chu)(chu)引腳，可(ke)通過(guo)直接驅動(dong)1個(ge)外部LED來顯(xian)示電(dian)(dian)池(chi)充(chong)電(dian)(dian)狀態。

　　價格與供貨

　　AAT3783的額定工作溫度范圍是-40至+85℃。它(ta)采用無(wu)鉛、16引(yin)腳TDFN封裝，訂(ding)貨量為1000片(pian)時(shi)每片(pian)單(dan)價為0.95美元。