為移動消費電子產品提供電源管理半導體器件的開發商Analogictech有限公司（納斯達克: AATI）日前宣布，推出一款產品編號為AAT3670的高度集成1.6A動態電池充電器與電源管理芯片。該款高度智能型器件將一個電池充電器、限(xian)流(liu)負載開關電(dian)(dian)(dian)(dian)(dian)路及控制電(dian)(dian)(dian)(dian)(dian)路集成于一(yi)體(ti)，適(shi)用于由單塊鋰離子/聚合物電(dian)(dian)(dian)(dian)(dian)池(chi)供電(dian)(dian)(dian)(dian)(dian)的(de)(de)便攜(xie)式系(xi)統(tong)，并在不損害電(dian)(dian)(dian)(dian)(dian)池(chi)的(de)(de)充電(dian)(dian)(dian)(dian)(dian)壽命周期以(yi)及無需(xu)添加外置(zhi)負載開關的(de)(de)情況下，允許使(shi)用者在通過一(yi)個AC適(shi)配器或USB端口(kou)給電(dian)(dian)(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)(dian)(dian)同時，運行他(ta)們的(de)(de)系(xi)統(tong)。AAT3670可(ke)向(xiang)電(dian)(dian)(dian)(dian)(dian)池(chi)提供盡可(ke)能最(zui)高的(de)(de)充電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)，從而能夠讓消費者以(yi)盡可(ke)能最(zui)短(duan)的(de)(de)充電(dian)(dian)(dian)(dian)(dian)時間來完成充電(dian)(dian)(dian)(dian)(dian)。 

　　“便攜式系(xi)統設(she)(she)計(ji)師想要(yao)在系(xi)統運行(xing)的同時，保(bao)證(zheng)電(dian)(dian)池(chi)在最(zui)大的有(you)用(yong)電(dian)(dian)流(liu)(liu)下充(chong)電(dian)(dian)，他們(men)必須將此(ci)(ci)功(gong)能特性設(she)(she)法設(she)(she)計(ji)進(jin)帶有(you)單立元(yuan)件的系(xi)統內(nei)。”AnalogicTech產品線主管Bill Weiss說。“AAT3670通過連(lian)續監控系(xi)統運行(xing)當中的功(gong)率(lv)需求，據此(ci)(ci)自動調節充(chong)電(dian)(dian)電(dian)(dian)流(liu)(liu)，這樣就為電(dian)(dian)池(chi)提(ti)供了(le)盡可能最(zui)高的充(chong)電(dian)(dian)電(dian)(dian)流(liu)(liu)，并(bing)因此(ci)(ci)使(shi)電(dian)(dian)池(chi)充(chong)電(dian)(dian)時間最(zui)短化(hua)。另外，它還減少了(le)元(yuan)器件的使(shi)用(yong)數量(liang)，降低了(le)原料成本（BOM），并(bing)縮小(xiao)了(le)印刷電(dian)(dian)路板(ban)（PCB）的尺寸(cun)。”

　　動態供電電源

　　AAT3670通過在電(dian)(dian)源(yuan)、電(dian)(dian)池和系(xi)統之間同時進行功率的分配管(guan)理(li)，可(ke)為系(xi)統負載(zai)提供(gong)動態(tai)的供(gong)電(dian)(dian)電(dian)(dian)源(yuan)。如果(guo)系(xi)統負載(zai)電(dian)(dian)流(liu)大于來自AC適(shi)配器或USB端口可(ke)提供(gong)的輸入電(dian)(dian)源(yuan)電(dian)(dian)流(liu)，AAT3670可(ke)以(yi)從電(dian)(dian)池中供(gong)應額外(wai)所需。

　　一(yi)個電(dian)(dian)壓感應電(dian)(dian)荷抑(yi)制回(hui)路（voltage-sensing charge reducTIon loop）對(dui)AC適(shi)配器和USB的(de)(de)輸(shu)入電(dian)(dian)壓進行(xing)監(jian)控，并且根據系統負載電(dian)(dian)流所需多少，對(dui)電(dian)(dian)池(chi)的(de)(de)充電(dian)(dian)電(dian)(dian)流進行(xing)阻截(jie)，從而自動防止電(dian)(dian)壓下跌。此功能(neng)(neng)僅通(tong)過自動調節(jie)充電(dian)(dian)電(dian)(dian)流到某一(yi)限度就能(neng)(neng)保持輸(shu)入源電(dian)(dian)壓的(de)(de)完(wan)整性，同時(shi)還確保了(le)系統的(de)(de)連續(xu)運行(xing)，并用最(zui)短的(de)(de)時(shi)間對(dui)電(dian)(dian)池(chi)進行(xing)充電(dian)(dian)。

　　在重負載狀態下，芯片的內部溫度有可能升高（根據PCB的具體設計情況）。傳統的熱保護電路只是簡單地將熱源關閉。由于AAT3670可向系統提供工作電源，這樣的關閉會被認為是一個故障狀況，所以是不能被允許的。因此，AAT3670內置一個數字熱控回路，它可以測量內部晶圓片的溫度，還可以在晶圓片溫度超出極限值時，降低充電電流。由于不關閉電池充電器，此數字熱控回路會(hui)根(gen)據(ju)一(yi)系列的運行狀況，將(jiang)充電(dian)電(dian)流保持(chi)最大。

　　對(dui)使(shi)用AC適配器(qi)進行充(chong)(chong)電(dian)時(shi)，AAT3670所提(ti)供的電(dian)池充(chong)(chong)電(dian)電(dian)流可以(yi)調到(dao)(dao)1.6A；對(dui)使(shi)用USB高電(dian)壓充(chong)(chong)電(dian)，可調到(dao)(dao)0.9A；對(dui)使(shi)用USB低(di)電(dian)壓充(chong)(chong)電(dian)，可調到(dao)(dao)0.1A。低(di)的“電(dian)池到(dao)(dao)系統”（battery-to-system）阻抗可以(yi)將(jiang)功耗(hao)和電(dian)壓余量（voltage headroom）保持最(zui)小。

　　AAT3670可監控電池在各種故障狀態下的溫度和充電狀況，這些故障包括過電壓、短路和超溫。在故障發生時，充電器能(neng)夠自動關閉以保(bao)(bao)護(hu)充電(dian)(dian)(dian)(dian)(dian)設備(bei)、控制(zhi)系統和電(dian)(dian)(dian)(dian)(dian)池。一個(ge)電(dian)(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)(dian)器(qi)的(de)(de)計時器(qi)同樣可(ke)以在超出用戶所設置的(de)(de)充電(dian)(dian)(dian)(dian)(dian)時長的(de)(de)情況下終(zhong)止充電(dian)(dian)(dian)(dian)(dian)，從而(er)保(bao)(bao)護(hu)了電(dian)(dian)(dian)(dian)(dian)池和系統。兩個(ge)狀態監控輸出引腳可(ke)通過外接的(de)(de)LED（發光二極管）來指示電(dian)(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)(dian)狀態。