凌力爾特公司(LinearTechnologyCorporation)推出單片線性電源管理器、理想二極管控制器和獨立電池充電器LTC4067，該器件(jian)適(shi)用于便攜式產(chan)品和電(dian)(dian)(dian)(dian)(dian)池(chi)備份系(xi)統。LTC4067可以接受(shou)USB電(dian)(dian)(dian)(dian)(dian)源、交流(liu)適(shi)配(pei)器或電(dian)(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)(dian)源。它具有(you)PowerPath控制功能，可向外部設備供(gong)電(dian)(dian)(dian)(dian)(dian)，也可從USB總(zong)線或交流(liu)適(shi)配(pei)器電(dian)(dian)(dian)(dian)(dian)源給單節鋰離子(zi)/聚合物電(dian)(dian)(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)(dian)(dian)。該器件(jian)有(you)片上(shang)內部過壓(ya)控制電(dian)(dian)(dian)(dian)(dian)路(lu)，與(yu)外部P溝道MOSFET配(pei)合使用時(shi)，對輸入(ru)提供(gong)13V保(bao)護。系(xi)統負載電(dian)(dian)(dian)(dian)(dian)流(liu)增大時(shi)，LTC4067自動(dong)降低電(dian)(dian)(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)，從而確保(bao)輸入(ru)電(dian)(dian)(dian)(dian)(dian)流(liu)不超過編(bian)程值。為了在(zai)總(zong)線連接時(shi)保(bao)持(chi)電(dian)(dian)(dian)(dian)(dian)池(chi)充分(fen)充電(dian)(dian)(dian)(dian)(dian)，該集成(cheng)電(dian)(dian)(dian)(dian)(dian)路(lu)將電(dian)(dian)(dian)(dian)(dian)源直接導(dao)引到負載處，而不是從電(dian)(dian)(dian)(dian)(dian)池(chi)中抽取功率。一旦電(dian)(dian)(dian)(dian)(dian)源被去掉(diao)，電(dian)(dian)(dian)(dian)(dian)流(liu)就通(tong)過內部200mΩ低損耗理想二極管從電(dian)(dian)(dian)(dian)(dian)池(chi)流(liu)向負載，從而最大限度地降低了壓(ya)降和功耗。

    用(yong)交(jiao)流適配器供電(dian)(dian)(dian)時，LTC4067能夠以高達1.5A對電(dian)(dian)(dian)池進行快速充(chong)電(dian)(dian)(dian)，也可通過外部引腳選擇而(er)把(ba)充(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流限制為全(quan)標度(du)(du)電(dian)(dian)(dian)阻器編程值的(de)20%或100%，以符(fu)合USB輸(shu)入(ru)電(dian)(dian)(dian)流限值規范。電(dian)(dian)(dian)池浮動(dong)(dong)電(dian)(dian)(dian)壓預(yu)置為4.2V，在整個工業(ye)溫度(du)(du)范圍內保證0.8%的(de)準(zhun)確(que)度(du)(du)。其它充(chong)電(dian)(dian)(dian)器功能包括熱調節、自動(dong)(dong)再充(chong)電(dian)(dian)(dian)、NTC熱敏電(dian)(dian)(dian)阻輸(shu)入(ru)、涓流充(chong)電(dian)(dian)(dian)和壞電(dian)(dian)(dian)池單元檢(jian)測。

    LTC4067采用纖巧(qiao)、扁平(0.75mm)12引(yin)腳(jiao)4mmx3mmDFN封裝(zhuang)，在-40℃至85℃的溫度范圍內保證工作。以1,000片為(wei)單位(wei)批量(liang)購買，每片起價為(wei)1.70美元。

    LTC4067性能概要：

    電池充電器(qi)/PowerPath管理器(qi)：

    *13V過(guo)壓保護控制器

    *具4.2V浮動電壓的全功能電池充電器

    *高達1.5A的可編程(cheng)充電(dian)電(dian)流

    *熱調節最大限(xian)度地增大了充電電流，無過(guo)熱風險

    *始自(zi)電壓(ya)模式充電的內部兩小時(shi)充電終(zhong)止定時(shi)器

    *可進(jin)行至電池電源的自(zi)動負載切換，并具有內部理想二極管和用于可選外部MOSFET的驅動輸出

    *NTC熱敏電阻(zu)輸入

    *失效(xiao)電池超(chao)時檢測

    可編程輸入電流限制：

    *用CLPROG引腳上的單個電(dian)(dian)阻設置(zhi)和監視輸入電(dian)(dian)流

    *扁平(0.75mm)4mmx3mm12引線DFN封(feng)裝(zhuang)