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(qi)(qi)(qi)(qi)件適用于便攜式產品和(he)電(dian)(dian)(dian)(dian)池備(bei)份系統(tong)。LTC4067可以(yi)接受USB電(dian)(dian)(dian)(dian)源(yuan)(yuan)、交流(liu)(liu)適配器(qi)(qi)(qi)(qi)或電(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)源(yuan)(yuan)。它(ta)具有(you)(you)PowerPath控制功(gong)能，可向外部設備(bei)供(gong)電(dian)(dian)(dian)(dian)，也可從USB總(zong)線或交流(liu)(liu)適配器(qi)(qi)(qi)(qi)電(dian)(dian)(dian)(dian)源(yuan)(yuan)給單節鋰離(li)子(zi)/聚合物電(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)。該器(qi)(qi)(qi)(qi)件有(you)(you)片(pian)上(shang)內(nei)部過(guo)壓(ya)控制電(dian)(dian)(dian)(dian)路，與外部P溝道MOSFET配合使用時，對輸入提供(gong)13V保護。系統(tong)負(fu)載(zai)電(dian)(dian)(dian)(dian)流(liu)(liu)增大時，LTC4067自(zi)動降低電(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)(liu)，從而確保輸入電(dian)(dian)(dian)(dian)流(liu)(liu)不超過(guo)編程值。為了(le)在總(zong)線連接時保持電(dian)(dian)(dian)(dian)池充分充電(dian)(dian)(dian)(dian)，該集成電(dian)(dian)(dian)(dian)路將電(dian)(dian)(dian)(dian)源(yuan)(yuan)直接導(dao)引到負(fu)載(zai)處，而不是從電(dian)(dian)(dian)(dian)池中抽取功(gong)率。一旦電(dian)(dian)(dian)(dian)源(yuan)(yuan)被去掉，電(dian)(dian)(dian)(dian)流(liu)(liu)就通(tong)過(guo)內(nei)部200mΩ低損耗理想(xiang)二極管從電(dian)(dian)(dian)(dian)池流(liu)(liu)向負(fu)載(zai)，從而最大限度地(di)降低了(le)壓(ya)降和(he)功(gong)耗。

    用交流(liu)(liu)適配(pei)器(qi)供電(dian)(dian)(dian)時，LTC4067能夠以(yi)高達1.5A對電(dian)(dian)(dian)池進(jin)行快速充(chong)電(dian)(dian)(dian)，也(ye)可通過外部引(yin)腳選擇而把(ba)充(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流(liu)(liu)限制為(wei)全標度(du)電(dian)(dian)(dian)阻(zu)器(qi)編(bian)程值的20%或100%，以(yi)符合USB輸(shu)入電(dian)(dian)(dian)流(liu)(liu)限值規范。電(dian)(dian)(dian)池浮(fu)動電(dian)(dian)(dian)壓(ya)預置為(wei)4.2V，在整(zheng)個工業溫度(du)范圍內保證0.8%的準確度(du)。其(qi)它充(chong)電(dian)(dian)(dian)器(qi)功能包(bao)括熱調節、自動再充(chong)電(dian)(dian)(dian)、NTC熱敏電(dian)(dian)(dian)阻(zu)輸(shu)入、涓流(liu)(liu)充(chong)電(dian)(dian)(dian)和(he)壞電(dian)(dian)(dian)池單元檢測。

    LTC4067采用(yong)纖巧、扁平(0.75mm)12引腳4mmx3mmDFN封裝，在-40℃至(zhi)85℃的溫度范圍內保證工作。以1,000片(pian)為(wei)(wei)單位批量購買，每片(pian)起價(jia)為(wei)(wei)1.70美元。

    LTC4067性能概要：

    電(dian)池(chi)充電(dian)器/PowerPath管理器：

    *13V過壓保護(hu)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(bian)程充電電流

    *熱調節(jie)最大限度地增大了充(chong)電電流，無過熱風險

    *始(shi)自電壓模式充電的內部兩小時(shi)充電終(zhong)止定時(shi)器

    *可(ke)(ke)進(jin)行至電池(chi)電源的自動負(fu)載切換，并具有內部理(li)想二極管(guan)和用于(yu)可(ke)(ke)選外部MOSFET的驅動輸出

    *NTC熱敏電阻輸入

    *失效電池超時(shi)檢(jian)測

    可編程(cheng)輸(shu)入電流限制：

    *用CLPROG引腳上的單個電阻設置(zhi)和監(jian)視(shi)輸(shu)入電流

    *扁(bian)平(0.75mm)4mmx3mm12引線DFN封(feng)裝