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)件適用于(yu)便攜式產品和電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池備份系統(tong)。LTC4067可以(yi)接(jie)受(shou)USB電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)、交流(liu)適配(pei)器(qi)或(huo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)。它具有PowerPath控制功(gong)(gong)能，可向(xiang)外部(bu)設備供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，也(ye)可從(cong)(cong)(cong)USB總(zong)線或(huo)交流(liu)適配(pei)器(qi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)給單節鋰離子/聚合物電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)。該(gai)器(qi)件有片上內(nei)(nei)部(bu)過(guo)壓控制電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路，與外部(bu)P溝道MOSFET配(pei)合使用時，對(dui)輸入提供13V保護。系統(tong)負(fu)載電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)增(zeng)大時，LTC4067自動降低電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)，從(cong)(cong)(cong)而(er)確(que)保輸入電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)不超(chao)過(guo)編程(cheng)值。為了在總(zong)線連接(jie)時保持(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池充(chong)(chong)分充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，該(gai)集成電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路將電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)直接(jie)導引到負(fu)載處，而(er)不是從(cong)(cong)(cong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池中抽取功(gong)(gong)率(lv)。一(yi)旦電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)被(bei)去掉(diao)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)就通過(guo)內(nei)(nei)部(bu)200mΩ低損耗理想二極管(guan)從(cong)(cong)(cong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池流(liu)向(xiang)負(fu)載，從(cong)(cong)(cong)而(er)最大限度地降低了壓降和功(gong)(gong)耗。

    用交流(liu)(liu)適配器供電(dian)時(shi)，LTC4067能夠以(yi)高達1.5A對電(dian)池進行快速充(chong)電(dian)，也可通(tong)過(guo)外部引腳選擇而把充(chong)電(dian)電(dian)流(liu)(liu)限(xian)制為(wei)全(quan)標度電(dian)阻器編程值的(de)20%或100%，以(yi)符合USB輸入電(dian)流(liu)(liu)限(xian)值規范(fan)。電(dian)池浮動(dong)電(dian)壓預置為(wei)4.2V，在整個工業溫度范(fan)圍內保證0.8%的(de)準(zhun)確度。其它(ta)充(chong)電(dian)器功能包(bao)括(kuo)熱調節、自動(dong)再充(chong)電(dian)、NTC熱敏(min)電(dian)阻輸入、涓流(liu)(liu)充(chong)電(dian)和(he)壞電(dian)池單元(yuan)檢測。

    LTC4067采用纖巧、扁平(ping)(0.75mm)12引腳4mmx3mmDFN封裝，在-40℃至85℃的溫度范圍內(nei)保證工作。以1,000片為單位批量購(gou)買，每(mei)片起價為1.70美元。

    LTC4067性能(neng)概(gai)要：

    電池(chi)充電器/PowerPath管理器：

    *13V過壓(ya)保護(hu)控制器

    *具4.2V浮動電壓的全功能電池充電器

    *高(gao)達(da)1.5A的可編(bian)程充電電流(liu)

    *熱調(diao)節最(zui)大限度(du)地增大了(le)充電電流，無(wu)過熱風險

    *始自電壓模式充電的(de)內部(bu)兩小(xiao)時充電終(zhong)止定時器

    *可進(jin)行至(zhi)電池(chi)電源的(de)(de)自動負(fu)載(zai)切換，并具有內(nei)部(bu)理想二極管和(he)用于(yu)可選(xuan)外部(bu)MOSFET的(de)(de)驅動輸出

    *NTC熱敏電阻輸入

    *失效電池超時檢測

    可編程輸(shu)入電流限制：

    *用CLPROG引腳上(shang)的單個電阻(zu)設置和(he)監視輸入(ru)電流

    *扁平(0.75mm)4mmx3mm12引線DFN封裝