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)(liu)負載(zai)開關電(dian)(dian)路及控制電(dian)(dian)路集成于(yu)一體，適用于(yu)由單塊鋰離子/聚合物電(dian)(dian)池(chi)(chi)供(gong)電(dian)(dian)的(de)(de)(de)便攜式(shi)系統(tong)，并在(zai)(zai)不(bu)損害電(dian)(dian)池(chi)(chi)的(de)(de)(de)充(chong)電(dian)(dian)壽命周期(qi)以(yi)及無(wu)需添加外置負載(zai)開關的(de)(de)(de)情況(kuang)下，允許使用者(zhe)在(zai)(zai)通過一個AC適配器或(huo)USB端口(kou)給電(dian)(dian)池(chi)(chi)充(chong)電(dian)(dian)同時，運(yun)行(xing)他們的(de)(de)(de)系統(tong)。AAT3670可(ke)向電(dian)(dian)池(chi)(chi)提供(gong)盡(jin)(jin)可(ke)能(neng)最高(gao)的(de)(de)(de)充(chong)電(dian)(dian)電(dian)(dian)流(liu)(liu)，從(cong)而(er)能(neng)夠讓消費者(zhe)以(yi)盡(jin)(jin)可(ke)能(neng)最短的(de)(de)(de)充(chong)電(dian)(dian)時間來完成充(chong)電(dian)(dian)。 

　　“便攜(xie)式系統設計師想(xiang)要(yao)在(zai)系統運(yun)行(xing)的(de)(de)同時(shi)，保證電(dian)(dian)池在(zai)最大的(de)(de)有用電(dian)(dian)流下(xia)充(chong)電(dian)(dian)，他(ta)們必須將此功能特性設法設計進帶有單立元(yuan)件(jian)的(de)(de)系統內。”AnalogicTech產品(pin)線主(zhu)管Bill Weiss說。“AAT3670通過連續監控系統運(yun)行(xing)當中的(de)(de)功率(lv)需(xu)求，據(ju)此自(zi)動調節充(chong)電(dian)(dian)電(dian)(dian)流，這樣就為電(dian)(dian)池提供了(le)(le)盡可(ke)能最高(gao)的(de)(de)充(chong)電(dian)(dian)電(dian)(dian)流，并因此使電(dian)(dian)池充(chong)電(dian)(dian)時(shi)間最短(duan)化。另外，它還減少了(le)(le)元(yuan)器(qi)件(jian)的(de)(de)使用數量，降低了(le)(le)原料成本（BOM），并縮小(xiao)了(le)(le)印刷電(dian)(dian)路板（PCB）的(de)(de)尺寸(cun)。”

　　動態供電電源

　　AAT3670通過(guo)在電(dian)(dian)源、電(dian)(dian)池(chi)和系(xi)(xi)統(tong)(tong)之間同時進行功率(lv)的分配管(guan)理，可(ke)為系(xi)(xi)統(tong)(tong)負載提供動態的供電(dian)(dian)電(dian)(dian)源。如果系(xi)(xi)統(tong)(tong)負載電(dian)(dian)流大于來(lai)自AC適(shi)配器或USB端口可(ke)提供的輸(shu)入電(dian)(dian)源電(dian)(dian)流，AAT3670可(ke)以從電(dian)(dian)池(chi)中供應(ying)額(e)外(wai)所需(xu)。

　　一個電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)感應電(dian)(dian)(dian)(dian)(dian)荷抑制回路（voltage-sensing charge reducTIon loop）對(dui)AC適配(pei)器和USB的輸(shu)入電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)進行(xing)監控，并且根據系統(tong)負載電(dian)(dian)(dian)(dian)(dian)流所需(xu)多少，對(dui)電(dian)(dian)(dian)(dian)(dian)池的充電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流進行(xing)阻截，從而自動防止(zhi)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)下跌。此(ci)功能(neng)僅(jin)通過自動調(diao)節充電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流到某一限度就(jiu)能(neng)保持輸(shu)入源電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)的完整性，同時還確保了系統(tong)的連續運行(xing)，并用最短(duan)的時間對(dui)電(dian)(dian)(dian)(dian)(dian)池進行(xing)充電(dian)(dian)(dian)(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(ci)數字熱(re)控回路會根(gen)據一系列的運(yun)行狀況，將充電電流保持最大。

　　對使用(yong)(yong)AC適配器進行充電(dian)(dian)(dian)(dian)時，AAT3670所(suo)提供(gong)的電(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)可(ke)以調到1.6A；對使用(yong)(yong)USB高電(dian)(dian)(dian)(dian)壓(ya)(ya)充電(dian)(dian)(dian)(dian)，可(ke)調到0.9A；對使用(yong)(yong)USB低電(dian)(dian)(dian)(dian)壓(ya)(ya)充電(dian)(dian)(dian)(dian)，可(ke)調到0.1A。低的“電(dian)(dian)(dian)(dian)池到系統”（battery-to-system）阻抗可(ke)以將功耗和(he)電(dian)(dian)(dian)(dian)壓(ya)(ya)余量（voltage headroom）保持最小。

　　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，充電器能夠(gou)自(zi)動關閉以(yi)保護充電設備、控制(zhi)系(xi)統和(he)電池(chi)。一個電池(chi)充電器(qi)的(de)計時(shi)器(qi)同樣(yang)可(ke)以(yi)在超出用(yong)戶所設置的(de)充電時(shi)長的(de)情況下終(zhong)止(zhi)充電，從而保護了電池(chi)和(he)系(xi)統。兩個狀態監控輸(shu)出引腳可(ke)通過(guo)外接的(de)LED（發光二極管(guan)）來指(zhi)示電池(chi)充電狀態。