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)件(jian)適(shi)用于便攜式產品和(he)電(dian)(dian)(dian)(dian)(dian)池備(bei)份系(xi)(xi)統。LTC4067可以接受USB電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)、交(jiao)流適(shi)配器(qi)(qi)或電(dian)(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)。它具有PowerPath控(kong)制(zhi)功(gong)能，可向(xiang)外部設備(bei)供電(dian)(dian)(dian)(dian)(dian)，也可從(cong)(cong)USB總線或交(jiao)流適(shi)配器(qi)(qi)電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)給單節鋰離(li)子/聚合物電(dian)(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)(dian)。該器(qi)(qi)件(jian)有片(pian)上內(nei)部過壓控(kong)制(zhi)電(dian)(dian)(dian)(dian)(dian)路，與(yu)外部P溝道MOSFET配合使用時，對輸入提供13V保(bao)護。系(xi)(xi)統負載電(dian)(dian)(dian)(dian)(dian)流增大時，LTC4067自動降低電(dian)(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流，從(cong)(cong)而確(que)保(bao)輸入電(dian)(dian)(dian)(dian)(dian)流不超過編(bian)程值(zhi)。為了在總線連接時保(bao)持(chi)電(dian)(dian)(dian)(dian)(dian)池充分(fen)充電(dian)(dian)(dian)(dian)(dian)，該集成電(dian)(dian)(dian)(dian)(dian)路將電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)直接導引(yin)到負載處，而不是從(cong)(cong)電(dian)(dian)(dian)(dian)(dian)池中抽(chou)取功(gong)率(lv)。一旦電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)被(bei)去掉，電(dian)(dian)(dian)(dian)(dian)流就通(tong)過內(nei)部200mΩ低損耗(hao)理想二(er)極管從(cong)(cong)電(dian)(dian)(dian)(dian)(dian)池流向(xiang)負載，從(cong)(cong)而最大限度(du)地降低了壓降和(he)功(gong)耗(hao)。

    用交流適配器(qi)供電(dian)(dian)(dian)(dian)時，LTC4067能夠以高達1.5A對電(dian)(dian)(dian)(dian)池進(jin)行快(kuai)速充(chong)電(dian)(dian)(dian)(dian)，也可(ke)通過外部(bu)引腳選(xuan)擇(ze)而把(ba)充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流限(xian)(xian)制為全標度(du)(du)電(dian)(dian)(dian)(dian)阻(zu)器(qi)編程值(zhi)(zhi)的20%或(huo)100%，以符合USB輸入電(dian)(dian)(dian)(dian)流限(xian)(xian)值(zhi)(zhi)規范(fan)。電(dian)(dian)(dian)(dian)池浮動(dong)電(dian)(dian)(dian)(dian)壓(ya)預置為4.2V，在整個工(gong)業溫度(du)(du)范(fan)圍內保證0.8%的準(zhun)確(que)度(du)(du)。其(qi)它充(chong)電(dian)(dian)(dian)(dian)器(qi)功(gong)能包括熱調節、自動(dong)再充(chong)電(dian)(dian)(dian)(dian)、NTC熱敏電(dian)(dian)(dian)(dian)阻(zu)輸入、涓流充(chong)電(dian)(dian)(dian)(dian)和壞電(dian)(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(wen)度范圍內(nei)保證工作。以1,000片(pian)為單位批量購買，每片(pian)起(qi)價為1.70美元(yuan)。

    LTC4067性能概(gai)要：

    電池充電器/PowerPath管理器：

    *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(bian)程充電電流

    *熱調節(jie)最大限度地增大了充電電流，無過(guo)熱風險

    *始(shi)自電壓模(mo)式充(chong)電的內部兩小(xiao)時(shi)充(chong)電終止(zhi)定時(shi)器(qi)

    *可進行至(zhi)電池電源的(de)自動(dong)負載切換，并具有內部(bu)理想二(er)極管和用于可選外部(bu)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(cheng)輸入電流限制：

    *用(yong)CLPROG引(yin)腳(jiao)上的單個電阻設置和(he)監視(shi)輸入電流

    *扁(bian)平(0.75mm)4mmx3mm12引線DFN封裝