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)(shi)用于便攜式(shi)產品和(he)電(dian)(dian)(dian)(dian)池(chi)備份系統(tong)。LTC4067可(ke)(ke)以接(jie)受USB電(dian)(dian)(dian)(dian)源、交流(liu)適(shi)(shi)配器或(huo)電(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)源。它(ta)具有PowerPath控(kong)制功能，可(ke)(ke)向外部(bu)(bu)設備供電(dian)(dian)(dian)(dian)，也(ye)可(ke)(ke)從(cong)USB總線(xian)或(huo)交流(liu)適(shi)(shi)配器電(dian)(dian)(dian)(dian)源給單節鋰(li)離子/聚合物電(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)。該(gai)器件有片(pian)上內部(bu)(bu)過壓(ya)控(kong)制電(dian)(dian)(dian)(dian)路，與外部(bu)(bu)P溝道MOSFET配合使用時(shi)，對(dui)輸入(ru)提供13V保護。系統(tong)負載電(dian)(dian)(dian)(dian)流(liu)增大時(shi)，LTC4067自動降(jiang)低電(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)，從(cong)而確保輸入(ru)電(dian)(dian)(dian)(dian)流(liu)不超過編程值。為了(le)在總線(xian)連接(jie)時(shi)保持電(dian)(dian)(dian)(dian)池(chi)充(chong)分充(chong)電(dian)(dian)(dian)(dian)，該(gai)集成電(dian)(dian)(dian)(dian)路將電(dian)(dian)(dian)(dian)源直接(jie)導引到(dao)負載處，而不是(shi)從(cong)電(dian)(dian)(dian)(dian)池(chi)中抽取功率(lv)。一旦電(dian)(dian)(dian)(dian)源被去掉，電(dian)(dian)(dian)(dian)流(liu)就(jiu)通過內部(bu)(bu)200mΩ低損耗理想二極管(guan)從(cong)電(dian)(dian)(dian)(dian)池(chi)流(liu)向負載，從(cong)而最(zui)大限度地降(jiang)低了(le)壓(ya)降(jiang)和(he)功耗。

    用交流(liu)適配器(qi)供(gong)電(dian)(dian)(dian)(dian)時，LTC4067能(neng)夠以高達1.5A對電(dian)(dian)(dian)(dian)池進行(xing)快速充電(dian)(dian)(dian)(dian)，也可通過(guo)外部(bu)引腳選擇而把充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)限制為(wei)全標度電(dian)(dian)(dian)(dian)阻(zu)器(qi)編程值的20%或100%，以符合(he)USB輸入電(dian)(dian)(dian)(dian)流(liu)限值規范(fan)。電(dian)(dian)(dian)(dian)池浮動電(dian)(dian)(dian)(dian)壓預置為(wei)4.2V，在整個工業溫度范(fan)圍(wei)內保證0.8%的準確度。其它充電(dian)(dian)(dian)(dian)器(qi)功能(neng)包(bao)括熱調節、自動再充電(dian)(dian)(dian)(dian)、NTC熱敏電(dian)(dian)(dian)(dian)阻(zu)輸入、涓流(liu)充電(dian)(dian)(dian)(dian)和(he)壞電(dian)(dian)(dian)(dian)池單元(yuan)檢(jian)測。

    LTC4067采用纖巧(qiao)、扁平(0.75mm)12引腳(jiao)4mmx3mmDFN封裝，在-40℃至85℃的溫(wen)度范圍(wei)內保(bao)證(zheng)工作(zuo)。以(yi)1,000片為單位批量購買，每片起價為1.70美(mei)元。

    LTC4067性能概(gai)要(yao)：

    電(dian)池充電(dian)器(qi)(qi)/PowerPath管(guan)理(li)器(qi)(qi)：

    *13V過壓保(bao)護控(kong)制器

    *具4.2V浮動電壓的全功能電池充電器

    *高達1.5A的(de)可(ke)編程充電(dian)電(dian)流

    *熱調節最大(da)限度地增大(da)了(le)充電電流，無過熱風險

    *始自電(dian)壓模式充電(dian)的內部兩小時充電(dian)終止定(ding)時器

    *可(ke)進行至電池(chi)電源的自動負載切換，并(bing)具有內(nei)部(bu)理想二極管和用于可(ke)選(xuan)外部(bu)MOSFET的驅動輸(shu)出

    *NTC熱(re)敏電阻輸入

    *失效電(dian)池超時檢測

    可(ke)編(bian)程輸(shu)入電(dian)流限制：

    *用CLPROG引腳上(shang)的單個電阻設置和監視輸入電流

    *扁平(0.75mm)4mmx3mm12引(yin)線DFN封(feng)裝