今天是一個全球無線互聯的時代，幾乎沒有什么比保持智能手機或移動互聯網設備的充電那么重要。不斷改善的便攜式和手持式設備擴展的功能帶給電池充電器集成電路(IC)設計人員一個嚴峻的挑戰。高分辨率屏幕和更大的存儲能力結合電池所具備的新功能，都需要電池充電器技術不僅(jin)更高效，還要(yao)能(neng)夠管理電源分(fen)配(pei)。

　　功耗的優化可以延長電池壽命，這一直是手持式電源管理的動力。但是，當把手持式設備的充電器插(cha)座插(cha)進墻壁時(shi)(shi)，怎樣的(de)(de)(de)(de)改變(bian)才是這(zhe)些設(she)備期(qi)望(wang)(wang)的(de)(de)(de)(de)效(xiao)率呢(ni)?最新一代設(she)備的(de)(de)(de)(de)設(she)計采用(yong)了高效(xiao)率的(de)(de)(de)(de)開關充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)器(qi)，以(yi)(yi)取代傳統(tong)的(de)(de)(de)(de)線性充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)器(qi)。當對(dui)電(dian)(dian)(dian)(dian)池充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)時(shi)(shi)，現在(zai)客(ke)(ke)戶不(bu)斷要求更短的(de)(de)(de)(de)充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)時(shi)(shi)間。使用(yong)開關充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)器(qi)解決方案可(ke)(ke)以(yi)(yi)比傳統(tong)的(de)(de)(de)(de)線性充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)器(qi)有更高的(de)(de)(de)(de)效(xiao)率，此(ci)外，一個(ge)重要優(you)勢(shi)是能夠提(ti)高由電(dian)(dian)(dian)(dian)源提(ti)供(gong)的(de)(de)(de)(de)充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流。在(zai)USB端口(kou)斷電(dian)(dian)(dian)(dian)時(shi)(shi)，可(ke)(ke)用(yong)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)流可(ke)(ke)能被限制在(zai)不(bu)到500mA，這(zhe)個(ge)優(you)勢(shi)尤其(qi)重要。充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流越高，充(chong)(chong)(chong)(chong)電(dian)(dian)(dian)(dian)時(shi)(shi)間就(jiu)越短，因此(ci)可(ke)(ke)以(yi)(yi)滿足客(ke)(ke)戶的(de)(de)(de)(de)期(qi)望(wang)(wang)。

　　現在，大多數手持式設備都采用了兩種電池充電器，一種是線性充電器，另一種是開關裝置。線(xian)(xian)性(xing)充(chong)(chong)電(dian)(dian)(dian)器已(yi)有較長的(de)(de)(de)歷史。這類(lei)充(chong)(chong)電(dian)(dian)(dian)器通常具備(bei)一個(ge)比較有效的(de)(de)(de)、簡(jian)單的(de)(de)(de)方法(fa)為便攜式(shi)設備(bei)充(chong)(chong)電(dian)(dian)(dian)，噪聲最小，又沒有很(hen)(hen)多外部元(yuan)件。但(dan)是，便攜式(shi)設備(bei)已(yi)變得越來越復雜，增加了很(hen)(hen)多新的(de)(de)(de)功能，所(suo)以需要(yao)更高的(de)(de)(de)電(dian)(dian)(dian)池(chi)容量。很(hen)(hen)明顯，如果用(yong)戶想要(yao)在使用(yong)設備(bei)的(de)(de)(de)同時給充(chong)(chong)電(dian)(dian)(dian)，由于功耗的(de)(de)(de)緣故，線(xian)(xian)性(xing)充(chong)(chong)電(dian)(dian)(dian)器存(cun)在著一些弊端(duan)。在使用(yong)的(de)(de)(de)同時充(chong)(chong)電(dian)(dian)(dian)所(suo)產生的(de)(de)(de)熱量可能損壞系統或電(dian)(dian)(dian)池(chi)。這不(bu)是一個(ge)好現象(xiang)。

　　另一種選擇是開關裝置或開關模式電池充電器IC，它(ta)可以為(wei)電池提供更(geng)高水(shui)平的(de)電流，而需要盡可能少的(de)電力。從過往的(de)經驗看，這類IC曾經存(cun)在一些(xie)噪聲問(wen)題。此外(wai)，前幾代的(de)一些(xie)開關式裝置還需要更(geng)多的(de)外(wai)部元件。

　　然而，開關式電池拓撲結構的(de)(de)(de)優(you)勢(shi)也(ye)是顯而易見。這些優(you)勢(shi)包括更(geng)高的(de)(de)(de)效率和更(geng)低的(de)(de)(de)功耗，還(huan)有更(geng)短的(de)(de)(de)充(chong)電時間(jian)。這些裝(zhuang)置還(huan)能利用較(jiao)高的(de)(de)(de)輸(shu)入電壓充(chong)電，可(ke)以使(shi)用成本較(jiao)低的(de)(de)(de)非(fei)穩壓適配器。這類裝(zhuang)置可(ke)以提高來自(zi)限流(liu)(liu)電流(liu)(liu)源的(de)(de)(de)充(chong)電電流(liu)(liu)。