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、限流(liu)負載開關(guan)電(dian)(dian)(dian)(dian)(dian)路及控制電(dian)(dian)(dian)(dian)(dian)路集成于一體，適用于由單(dan)塊鋰離(li)子/聚(ju)合物電(dian)(dian)(dian)(dian)(dian)池(chi)供(gong)電(dian)(dian)(dian)(dian)(dian)的便攜式系統(tong)，并在不損害電(dian)(dian)(dian)(dian)(dian)池(chi)的充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)壽命周期以及無需添(tian)加外置負載開關(guan)的情(qing)況(kuang)下，允許使用者(zhe)在通(tong)過一個AC適配器或USB端口給電(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)同(tong)時，運行他們的系統(tong)。AAT3670可向電(dian)(dian)(dian)(dian)(dian)池(chi)提供(gong)盡可能最(zui)高的充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)，從(cong)而能夠讓消費者(zhe)以盡可能最(zui)短的充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)時間來(lai)完成充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)。 

　　“便(bian)攜式系統(tong)設(she)計師想(xiang)要在系統(tong)運(yun)行(xing)的(de)(de)(de)(de)同時，保(bao)證電(dian)(dian)(dian)池(chi)在最(zui)大的(de)(de)(de)(de)有用電(dian)(dian)(dian)流下充電(dian)(dian)(dian)，他們必須將此(ci)(ci)功能特性設(she)法(fa)設(she)計進帶有單立(li)元(yuan)件的(de)(de)(de)(de)系統(tong)內(nei)。”AnalogicTech產品線主管(guan)Bill Weiss說。“AAT3670通過連續監控系統(tong)運(yun)行(xing)當中(zhong)的(de)(de)(de)(de)功率(lv)需求，據此(ci)(ci)自動調(diao)節(jie)充電(dian)(dian)(dian)電(dian)(dian)(dian)流，這樣就為電(dian)(dian)(dian)池(chi)提(ti)供了(le)盡可(ke)能最(zui)高的(de)(de)(de)(de)充電(dian)(dian)(dian)電(dian)(dian)(dian)流，并因(yin)此(ci)(ci)使電(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)時間最(zui)短化。另(ling)外，它還減少(shao)了(le)元(yuan)器件的(de)(de)(de)(de)使用數量，降低了(le)原料成本（BOM），并縮小了(le)印刷(shua)電(dian)(dian)(dian)路板（PCB）的(de)(de)(de)(de)尺(chi)寸。”

　　動態供電電源

　　AAT3670通(tong)過在電(dian)源、電(dian)池和系(xi)(xi)統(tong)之(zhi)間同時進(jin)行功率的(de)分(fen)配(pei)(pei)管理，可為(wei)系(xi)(xi)統(tong)負載提(ti)供動態的(de)供電(dian)電(dian)源。如果系(xi)(xi)統(tong)負載電(dian)流(liu)大于來自AC適配(pei)(pei)器或(huo)USB端口可提(ti)供的(de)輸(shu)入電(dian)源電(dian)流(liu)，AAT3670可以(yi)從電(dian)池中(zhong)供應(ying)額外所需。

　　一個電(dian)(dian)(dian)壓(ya)(ya)感應電(dian)(dian)(dian)荷抑制回路（voltage-sensing charge reducTIon loop）對AC適配器和USB的輸(shu)入電(dian)(dian)(dian)壓(ya)(ya)進行(xing)(xing)監控，并且根據(ju)系統負載電(dian)(dian)(dian)流所(suo)需(xu)多(duo)少，對電(dian)(dian)(dian)池的充電(dian)(dian)(dian)電(dian)(dian)(dian)流進行(xing)(xing)阻截，從而自動防止電(dian)(dian)(dian)壓(ya)(ya)下跌。此功能僅通過自動調節充電(dian)(dian)(dian)電(dian)(dian)(dian)流到(dao)某(mou)一限(xian)度就能保(bao)持輸(shu)入源電(dian)(dian)(dian)壓(ya)(ya)的完整性(xing)，同時還確保(bao)了系統的連續運(yun)行(xing)(xing)，并用最(zui)短(duan)的時間對電(dian)(dian)(dian)池進行(xing)(xing)充電(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，此數字熱控回(hui)路會根(gen)據(ju)一(yi)系(xi)列的運行狀況，將充電(dian)(dian)電(dian)(dian)流保持最大。

　　對使用AC適配器(qi)進行充(chong)電時，AAT3670所提(ti)供的電池(chi)充(chong)電電流可以(yi)調到(dao)1.6A；對使用USB高電壓充(chong)電，可調到(dao)0.9A；對使用USB低(di)電壓充(chong)電，可調到(dao)0.1A。低(di)的“電池(chi)到(dao)系(xi)統”（battery-to-system）阻抗可以(yi)將(jiang)功(gong)耗和(he)電壓余量(liang)（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，充電器能夠自動關閉以保(bao)護充(chong)電(dian)(dian)(dian)設(she)備(bei)、控(kong)制系統和電(dian)(dian)(dian)池(chi)。一個電(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)器的(de)(de)(de)計時(shi)器同樣可以在超出(chu)用(yong)戶所(suo)設(she)置的(de)(de)(de)充(chong)電(dian)(dian)(dian)時(shi)長(chang)的(de)(de)(de)情況下終止充(chong)電(dian)(dian)(dian)，從而保(bao)護了電(dian)(dian)(dian)池(chi)和系統。兩個狀(zhuang)態(tai)監控(kong)輸(shu)出(chu)引腳可通過外(wai)接的(de)(de)(de)LED（發光二極管）來指示(shi)電(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)狀(zhuang)態(tai)。