凌(ling)力爾特公司 (Linear Technology CorporatiON) 推出一款大功(gong)率(lv)、I2C 控(kong)制(zhi)、高效率(lv)電(dian)(dian)源通(tong)路 (PowerPathTM) 管理(li)器(qi)(qi)(qi)、理(li)想二極管控(kong)制(zhi)器(qi)(qi)(qi)和鋰離子(zi)電(dian)(dian)池充電(dian)(dian)器(qi)(qi)(qi) LTC4155，該(gai)器(qi)(qi)(qi)件(jian)適(shi)用(yong)于諸如平(ping)板 PC、超移動 PC (UMPC)、個(ge)人(ren)視頻播(bo)放器(qi)(qi)(qi)、智(zhi)能(neng)電(dian)(dian)話、數碼(ma)相(xiang)機、PDA、便攜式(shi)醫療和工業設備(bei)、以及(ji)個(ge)人(ren)導航設備(bei)等單(dan)節電(dian)(dian)池便攜式(shi)設備(bei)。該(gai) IC 設計用(yong)于從多種電(dian)(dian)源高效地(di)(di)輸(shu)送高達(da) 15W 的功(gong)率(lv)，同(tong)時(shi)最大限度地(di)(di)降低功(gong)耗并(bing)放寬熱預(yu)算限制(zhi)條件(jian)。LTC4155 的開關(guan) PowerPath 拓撲無(wu)縫地(di)(di)管理(li)諸如交流適(shi)配器(qi)(qi)(qi)和 USB 端口這樣兩個(ge)輸(shu)入電(dian)(dian)源到設備(bei)的可再(zai)充電(dian)(dian)鋰離子(zi)電(dian)(dian)池的電(dian)(dian)源分配，同(tong)時(shi)在(zai)輸(shu)入功(gong)率(lv)有限時(shi)，優(you)先(xian)向系統負載供電(dian)(dian)。

　　因為 LTC4155 節省了功(gong)(gong)率，所以(yi)(yi)該(gai)器(qi)(qi)件(jian)允(yun)許輸(shu)出(chu)負載電(dian)(dian)(dian)(dian)(dian)(dian)流超過(guo)輸(shu)入電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)吸取的(de)電(dian)(dian)(dian)(dian)(dian)(dian)流，從而(er)能最大(da)限(xian)度地(di)利用可用功(gong)(gong)率給電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)(dian)(dian)(dian)，而(er)不(bu)會超出(chu)輸(shu)入電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)規范的(de)要求(qiu)。例如(ru)，當從一個 5V/2A 交流適配器(qi)(qi)供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)時(shi)，該(gai) IC 的(de)開(kai)關穩(wen)壓器(qi)(qi)高效地(di)將可用 10W 功(gong)(gong)率的(de) 90% 以(yi)(yi)上傳送出(chu)去，從而(er)實現了高達 2.4A 的(de)充電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流，并實現了更快的(de)充電(dian)(dian)(dian)(dian)(dian)(dian)速(su)度。與普通開(kai)關電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)不(bu)同，LTC4155 的(de)特點是即(ji)時(shi)接(jie)通工作(zuo)，以(yi)(yi)確(que)保即(ji)使電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)已深度放電(dian)(dian)(dian)(dian)(dian)(dian)，一插上電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)插頭時(shi)就(jiu)有系統電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)。該(gai)器(qi)(qi)件(jian)支持 USB On-The-Go (USB OTG)，因此(ci)無需(xu)任何額外組件(jian)，就(jiu)可以(yi)(yi)反過(guo)來向 USB 端口提(ti)供(gong) 5V 電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)。

　　一個簡單的兩線 I2C 端口允許在電路板上調節很多系統控制參數，包括充電電流、輸入電流 (包括 USB 2.0 和 3.0 兼容設置) 和浮置電壓。該通信總線還允許 LTC4155 提供諸如電池溫度、輸入電源狀態、充電器狀(zhuang)(zhuang)態(tai)、以及故(gu)障狀(zhuang)(zhuang)態(tai)等的狀(zhuang)(zhuang)態(tai)信(xin)息。

　　LTC4155 的(de)自主型全(quan)功能單節鋰(li)離子(zi) / 聚合物電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)能提(ti)供高達 3.5A 的(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)以及(ji) 4 種(zhong)浮置(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)設置(zhi)(zhi)和 15 種(zhong)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)設置(zhi)(zhi)。為了改善安(an)全(quan)裕(yu)度(du)，集成(cheng)的(de)過熱電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)查驗電(dian)(dian)(dian)(dian)(dian)(dian)路可以有選擇地降低(di)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)，以防高電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)溫度(du)和高電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)同時出現。此外，該(gai)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)具有自動再(zai)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)、壞(huai)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)檢測(ce)、涓流(liu)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)、可編程(cheng)安(an)全(quan)定時器(qi)、熱敏電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)溫度(du)合格的(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)、可編程(cheng)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)結束指(zhi)示 / 終止、以及(ji)可編程(cheng)中斷發生等功能。

LTC4155 的(de)(de)雙輸出、優先級多路(lu)復(fu)用過壓(ya)保護 (OVP) 電(dian)(dian)路(lu)可(ke)(ke)避免因意外(wai)施加高電(dian)(dian)壓(ya)而造(zao)成的(de)(de)任何(he)損壞。其理想二極管控制(zhi)器可(ke)(ke)確保始(shi)終能夠向 VOUT 提供(gong)足(zu)夠的(de)(de)功(gong)率(lv)，即使在輸入功(gong)率(lv)不(bu)足(zu)或缺(que)失的(de)(de)情況下也不(bu)例(li)外(wai)。為最(zui)大(da)限度地減(jian)少當(dang)器件連接至(zhi)一(yi)個(ge)(ge)暫停 USB 端口時的(de)(de)電(dian)(dian)池消(xiao)耗(hao)，由一(yi)個(ge)(ge)布設在 VBUS 與 VOUT 之間的(de)(de) LDO 來給容許的(de)(de) USB 供(gong)電(dian)(dian)，以暫停向應用電(dian)(dian)路(lu)輸送(song)電(dian)(dian)流。為了消(xiao)除從(cong)制(zhi)造(zao)到(dao)銷售過程中(zhong)的(de)(de)電(dian)(dian)池消(xiao)耗(hao)，一(yi)種“裝運及貯存”特(te)性可(ke)(ke)將已經(jing)很低的(de)(de)電(dian)(dian)池待機電(dian)(dian)流減(jian)小至(zhi)接近于零。

　　LTC4155 采(cai)用扁平 (0.75mm) 28 引腳 4mm x 5mm QFN 封裝，在(zai) -40C 至(zhi) 85C 的溫度(du)范(fan)圍內工作有保證(zheng)。千片批(pi)購價為每片 4.07 美元。如(ru)需更多信息，請登錄 www.linear.com.cn/product/LTC4155。

　　性能概要：LTC4155

　　?能提供 3.5A 充電電流的大功率、高效率開關鋰離子電池充電器

　　?單片式開關(guan)穩(wen)壓(ya)器可最佳利用有限(xian)的可用輸入功(gong)率

　　?具有針(zhen)對多(duo)個輸(shu)入(ru)而進行優先級(ji)多(duo)路復用功能的雙通道、過(guo)壓保護控(kong)制器(qi)

　　?輸入過壓保護

　　?I2C / SMBus 控制實現(xian)最佳系(xi)統性能并提供(gong)狀態信(xin)息(xi)

　　?在低電池(chi)電量時即時接通工作

　　?電池理(li)(li)想二極管控(kong)制器實現電源管理(li)(li)

　　?從電(dian)池到 USB 端口的 USB OTG供電(dian)

　　?過熱(re)電(dian)池查驗器

　　?具 4 種浮置電壓設(she)置的全功能(neng)鋰離子/聚合物充電器

　　?從交流(liu)適(shi)配器提供 3.5A 最大充電(dian)電(dian)流(liu)

　　?支持 USB 2.0 和 USB 3.0 規范(fan)

　　?扁(bian)平 (0.75mm) 28 引線 4mm x 5mm QFN 封裝