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(yong)于便攜式產品和電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)備份(fen)系統(tong)。LTC4067可(ke)以接受USB電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)、交(jiao)流(liu)適(shi)配器(qi)(qi)或電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)。它具(ju)有PowerPath控(kong)制(zhi)功(gong)能，可(ke)向(xiang)外部(bu)(bu)設備供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，也可(ke)從(cong)USB總(zong)線(xian)或交(jiao)流(liu)適(shi)配器(qi)(qi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)給(gei)單節鋰離子/聚(ju)合物電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)。該器(qi)(qi)件(jian)有片(pian)上內(nei)部(bu)(bu)過(guo)壓控(kong)制(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路，與外部(bu)(bu)P溝(gou)道MOSFET配合使用(yong)時(shi)(shi)，對輸(shu)入(ru)提供13V保護。系統(tong)負(fu)載電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)增(zeng)大(da)時(shi)(shi)，LTC4067自動降低電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)，從(cong)而(er)確保輸(shu)入(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)不(bu)超過(guo)編程值。為了在(zai)總(zong)線(xian)連接時(shi)(shi)保持(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)充(chong)分充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，該集(ji)成電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路將電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)直(zhi)接導引(yin)到負(fu)載處(chu)，而(er)不(bu)是從(cong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)中抽取(qu)功(gong)率。一(yi)旦電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)被去掉(diao)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)就通(tong)過(guo)內(nei)部(bu)(bu)200mΩ低損耗理想二極管從(cong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)流(liu)向(xiang)負(fu)載，從(cong)而(er)最大(da)限度地(di)降低了壓降和功(gong)耗。

    用(yong)交流適(shi)配(pei)器(qi)供電(dian)時，LTC4067能(neng)夠(gou)以高達1.5A對(dui)電(dian)池進行快(kuai)速(su)充電(dian)，也可通過(guo)外部引腳選擇而把充電(dian)電(dian)流限制為全(quan)標(biao)度電(dian)阻(zu)器(qi)編程值的20%或100%，以符合USB輸入電(dian)流限值規(gui)范。電(dian)池浮動電(dian)壓預置為4.2V，在整(zheng)個工業溫度范圍內保(bao)證0.8%的準(zhun)確(que)度。其它充電(dian)器(qi)功能(neng)包括(kuo)熱調節、自動再充電(dian)、NTC熱敏(min)電(dian)阻(zu)輸入、涓流充電(dian)和壞電(dian)池單元檢測。

    LTC4067采(cai)用纖巧(qiao)、扁(bian)平(0.75mm)12引腳4mmx3mmDFN封裝，在(zai)-40℃至85℃的溫度范圍內(nei)保證工作。以1,000片為單位批量購買，每(mei)片起價(jia)為1.70美元。

    LTC4067性能概(gai)要：

    電池充電器/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(ke)編程充電電流

    *熱(re)調(diao)節最大(da)限(xian)度地增大(da)了充電電流，無(wu)過熱(re)風險(xian)

    *始自(zi)電壓模式(shi)充電的內部兩小時(shi)充電終(zhong)止定(ding)時(shi)器

    *可(ke)進行至電池電源的(de)自動負載切換(huan)，并具有內部理想二極管和(he)用于可(ke)選(xuan)外部MOSFET的(de)驅動輸出

    *NTC熱(re)敏(min)電阻輸入

    *失效電池超時檢測

    可編程輸入電流限制：

    *用CLPROG引(yin)腳上(shang)的單個(ge)電阻(zu)設置(zhi)和監視輸入(ru)電流(liu)

    *扁平(0.75mm)4mmx3mm12引線(xian)DFN封裝(zhuang)