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(gai)器(qi)件適用(yong)于便攜式產品和(he)(he)電(dian)(dian)(dian)(dian)(dian)池備份(fen)系統(tong)。LTC4067可(ke)以接受USB電(dian)(dian)(dian)(dian)(dian)源(yuan)、交(jiao)流適配(pei)器(qi)或電(dian)(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)(dian)源(yuan)。它具(ju)有PowerPath控制功能，可(ke)向外部設備供(gong)電(dian)(dian)(dian)(dian)(dian)，也(ye)可(ke)從USB總線或交(jiao)流適配(pei)器(qi)電(dian)(dian)(dian)(dian)(dian)源(yuan)給單節鋰離子/聚(ju)合物電(dian)(dian)(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)(dian)(dian)。該(gai)器(qi)件有片上內(nei)部過壓控制電(dian)(dian)(dian)(dian)(dian)路(lu)，與外部P溝道MOSFET配(pei)合使用(yong)時，對(dui)輸(shu)入提供(gong)13V保護(hu)。系統(tong)負載電(dian)(dian)(dian)(dian)(dian)流增大時，LTC4067自(zi)動降低(di)電(dian)(dian)(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流，從而(er)確(que)保輸(shu)入電(dian)(dian)(dian)(dian)(dian)流不(bu)超過編程值。為了在總線連(lian)接時保持(chi)電(dian)(dian)(dian)(dian)(dian)池充(chong)分充(chong)電(dian)(dian)(dian)(dian)(dian)，該(gai)集(ji)成電(dian)(dian)(dian)(dian)(dian)路(lu)將電(dian)(dian)(dian)(dian)(dian)源(yuan)直接導引到負載處，而(er)不(bu)是從電(dian)(dian)(dian)(dian)(dian)池中抽取功率。一旦電(dian)(dian)(dian)(dian)(dian)源(yuan)被去掉，電(dian)(dian)(dian)(dian)(dian)流就通過內(nei)部200mΩ低(di)損耗(hao)理想(xiang)二極管從電(dian)(dian)(dian)(dian)(dian)池流向負載，從而(er)最(zui)大限(xian)度(du)地降低(di)了壓降和(he)(he)功耗(hao)。

    用交流(liu)適(shi)配(pei)器供電(dian)(dian)時(shi)，LTC4067能夠(gou)以高達1.5A對電(dian)(dian)池(chi)進行快(kuai)速充電(dian)(dian)，也可通過外部(bu)引(yin)腳選(xuan)擇(ze)而(er)把(ba)充電(dian)(dian)電(dian)(dian)流(liu)限制為全標度電(dian)(dian)阻器編程(cheng)值(zhi)的20%或100%，以符(fu)合USB輸(shu)入(ru)電(dian)(dian)流(liu)限值(zhi)規(gui)范。電(dian)(dian)池(chi)浮動電(dian)(dian)壓預置為4.2V，在整個工業溫度范圍內保(bao)證0.8%的準確度。其它充電(dian)(dian)器功能包括(kuo)熱(re)調節、自動再(zai)充電(dian)(dian)、NTC熱(re)敏電(dian)(dian)阻輸(shu)入(ru)、涓流(liu)充電(dian)(dian)和壞電(dian)(dian)池(chi)單元檢測(ce)。

    LTC4067采用纖巧、扁平(ping)(0.75mm)12引腳4mmx3mmDFN封裝，在-40℃至85℃的(de)溫度范圍內(nei)保(bao)證工作。以1,000片為單位(wei)批量購買，每(mei)片起(qi)價為1.70美(mei)元。

    LTC4067性(xing)能概要：

    電池(chi)充(chong)電器/PowerPath管理(li)器：

    *13V過壓保(bao)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(ke)編程充電(dian)電(dian)流

    *熱(re)(re)調節(jie)最大(da)(da)限度地(di)增大(da)(da)了(le)充電電流，無(wu)過(guo)熱(re)(re)風(feng)險(xian)

    *始自電壓模式充(chong)電的內部兩小時充(chong)電終止定時器(qi)

    *可(ke)進行至(zhi)電池電源的(de)自動(dong)負載切(qie)換，并(bing)具有內部理想二極管和用于可(ke)選外部MOSFET的(de)驅動(dong)輸出

    *NTC熱敏電阻輸入

    *失效電池超時檢(jian)測

    可編程輸入電(dian)流限制：

    *用CLPROG引腳上的單個電(dian)阻(zu)設置和監視(shi)輸入電(dian)流

    *扁平(0.75mm)4mmx3mm12引線DFN封裝