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)器件適(shi)用于便攜式產品和電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)備(bei)份系統。LTC4067可以接受USB電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源、交流(liu)適(shi)配器或(huo)(huo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源。它(ta)具有PowerPath控制功能，可向外部(bu)設備(bei)供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，也可從(cong)USB總線(xian)或(huo)(huo)交流(liu)適(shi)配器電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源給單節(jie)鋰離(li)子/聚合物電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)。該(gai)器件有片(pian)上內(nei)部(bu)過壓控制電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)，與外部(bu)P溝道MOSFET配合使用時(shi)，對輸(shu)入提供13V保護。系統負(fu)載(zai)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)增大時(shi)，LTC4067自動降(jiang)(jiang)低(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)，從(cong)而確保輸(shu)入電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)不超過編程值。為了(le)在(zai)總線(xian)連接時(shi)保持(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)分充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，該(gai)集(ji)成電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)將(jiang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源直(zhi)接導(dao)引到(dao)負(fu)載(zai)處，而不是從(cong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)中抽取功率。一(yi)旦電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源被(bei)去掉(diao)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)就通過內(nei)部(bu)200mΩ低(di)(di)損耗(hao)理想二極(ji)管從(cong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)流(liu)向負(fu)載(zai)，從(cong)而最大限度地降(jiang)(jiang)低(di)(di)了(le)壓降(jiang)(jiang)和功耗(hao)。

    用交流(liu)適配器(qi)供電(dian)(dian)(dian)(dian)時，LTC4067能夠以高(gao)達1.5A對電(dian)(dian)(dian)(dian)池(chi)進行快速(su)充(chong)(chong)電(dian)(dian)(dian)(dian)，也可通過外部引腳選擇而(er)把充(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)限制為全標度(du)電(dian)(dian)(dian)(dian)阻器(qi)編程值(zhi)的20%或100%，以符合USB輸入電(dian)(dian)(dian)(dian)流(liu)限值(zhi)規范(fan)。電(dian)(dian)(dian)(dian)池(chi)浮動電(dian)(dian)(dian)(dian)壓預置為4.2V，在整個工業(ye)溫(wen)度(du)范(fan)圍內保證(zheng)0.8%的準確(que)度(du)。其它充(chong)(chong)電(dian)(dian)(dian)(dian)器(qi)功能包括(kuo)熱調節、自動再充(chong)(chong)電(dian)(dian)(dian)(dian)、NTC熱敏電(dian)(dian)(dian)(dian)阻輸入、涓(juan)流(liu)充(chong)(chong)電(dian)(dian)(dian)(dian)和壞電(dian)(dian)(dian)(dian)池(chi)單元檢測。

    LTC4067采用纖巧(qiao)、扁平(ping)(0.75mm)12引腳4mmx3mmDFN封(feng)裝，在-40℃至85℃的溫度范圍內保證工作(zuo)。以1,000片為單位批(pi)量購買，每片起價為1.70美元。

    LTC4067性能概要：

    電池充(chong)電器(qi)/PowerPath管理器(qi)：

    *13V過壓保護控制器

    *具4.2V浮動電壓的全功能電池充電器

    *高達1.5A的可編程充電電流

    *熱(re)調節最大(da)限度地增大(da)了(le)充電(dian)電(dian)流，無(wu)過熱(re)風險

    *始(shi)自電(dian)壓模式(shi)充電(dian)的內部兩小時充電(dian)終止定時器

    *可進行至(zhi)電池電源的自(zi)動負載切換，并具有(you)內(nei)部(bu)理想二極管和(he)用于可選外部(bu)MOSFET的驅動輸出

    *NTC熱敏電阻輸入(ru)

    *失效電池(chi)超(chao)時檢測

    可編程輸入電(dian)流限制：

    *用CLPROG引腳上的(de)單(dan)個電阻(zu)設(she)置和監視輸(shu)入電流(liu)

    *扁平(0.75mm)4mmx3mm12引(yin)線(xian)DFN封裝