凌力爾特公司 (Linear Technology CorporatiON) 推出(chu)一款大功率(lv)(lv)、I2C 控(kong)制(zhi)、高(gao)效(xiao)率(lv)(lv)電(dian)源通路 (PowerPathTM) 管(guan)理器、理想二極管(guan)控(kong)制(zhi)器和(he)鋰離子電(dian)池(chi)充電(dian)器 LTC4155，該器件(jian)適用于(yu)諸(zhu)如(ru)平板 PC、超移動 PC (UMPC)、個人(ren)視頻(pin)播放器、智能電(dian)話、數碼相機、PDA、便(bian)攜(xie)式醫療和(he)工(gong)業設備(bei)、以及個人(ren)導航設備(bei)等單節電(dian)池(chi)便(bian)攜(xie)式設備(bei)。該 IC 設計用于(yu)從多種電(dian)源高(gao)效(xiao)地輸(shu)送高(gao)達(da) 15W 的(de)功率(lv)(lv)，同時(shi)(shi)最大限度地降低功耗并放寬熱預(yu)算限制(zhi)條件(jian)。LTC4155 的(de)開關 PowerPath 拓撲無縫地管(guan)理諸(zhu)如(ru)交流適配器和(he) USB 端口這樣兩個輸(shu)入(ru)電(dian)源到設備(bei)的(de)可(ke)再充電(dian)鋰離子電(dian)池(chi)的(de)電(dian)源分配，同時(shi)(shi)在(zai)輸(shu)入(ru)功率(lv)(lv)有(you)限時(shi)(shi)，優先向系統負載供電(dian)。

　　因(yin)為 LTC4155 節(jie)省(sheng)了(le)(le)功(gong)率，所(suo)以該(gai)器(qi)(qi)(qi)件(jian)允許輸(shu)(shu)出(chu)負載電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)超過輸(shu)(shu)入電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源吸取的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，從而能最大限度(du)地(di)利用可(ke)用功(gong)率給電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，而不(bu)會超出(chu)輸(shu)(shu)入電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源供(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)規范的(de)(de)(de)(de)要求。例如(ru)，當從一個 5V/2A 交流(liu)(liu)(liu)適配器(qi)(qi)(qi)供(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)時(shi)，該(gai) IC 的(de)(de)(de)(de)開(kai)關穩(wen)壓(ya)器(qi)(qi)(qi)高(gao)效地(di)將可(ke)用 10W 功(gong)率的(de)(de)(de)(de) 90% 以上傳(chuan)送(song)出(chu)去(qu)，從而實(shi)現(xian)了(le)(le)高(gao)達 2.4A 的(de)(de)(de)(de)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，并實(shi)現(xian)了(le)(le)更(geng)快的(de)(de)(de)(de)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)速度(du)。與普通(tong)開(kai)關電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)不(bu)同，LTC4155 的(de)(de)(de)(de)特點是即時(shi)接(jie)通(tong)工作，以確保即使電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)已深度(du)放電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，一插上電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源插頭時(shi)就(jiu)有系統電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源。該(gai)器(qi)(qi)(qi)件(jian)支持 USB On-The-Go (USB OTG)，因(yin)此無需任何額外組件(jian)，就(jiu)可(ke)以反過來向 USB 端口提供(gong)(gong) 5V 電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源。

　　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、充電器狀態(tai)、以及故障狀態(tai)等的狀態(tai)信息。

　　LTC4155 的(de)自主型全(quan)功(gong)能單節鋰離子 / 聚合(he)物電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)器(qi)能提供高(gao)(gao)達(da) 3.5A 的(de)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)以及(ji) 4 種浮置(zhi)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)設置(zhi)和(he) 15 種充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)設置(zhi)。為了改善安全(quan)裕度，集成的(de)過熱(re)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)查驗電(dian)(dian)(dian)(dian)(dian)路可(ke)以有(you)選(xuan)擇(ze)地降低電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)，以防高(gao)(gao)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)溫度和(he)高(gao)(gao)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)同(tong)時出現(xian)。此外(wai)，該充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)器(qi)具有(you)自動(dong)再充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)、壞(huai)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)檢測(ce)、涓流(liu)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)、可(ke)編程(cheng)安全(quan)定(ding)時器(qi)、熱(re)敏電(dian)(dian)(dian)(dian)(dian)阻溫度合(he)格的(de)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)、可(ke)編程(cheng)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)結(jie)束指示 / 終止、以及(ji)可(ke)編程(cheng)中斷發生等功(gong)能。

LTC4155 的雙輸出、優先(xian)級(ji)多路復用(yong)過(guo)壓保護 (OVP) 電(dian)(dian)路可避(bi)免(mian)因意(yi)外(wai)(wai)施加高電(dian)(dian)壓而造成的任何(he)損壞。其理想(xiang)二極管控制(zhi)器可確(que)保始終能(neng)夠向 VOUT 提供(gong)(gong)足(zu)夠的功率，即使在輸入功率不足(zu)或缺(que)失的情況下也不例外(wai)(wai)。為(wei)最大限度地減(jian)少當(dang)器件連接至一個暫停(ting) USB 端口(kou)時的電(dian)(dian)池消耗(hao)，由一個布設在 VBUS 與(yu) VOUT 之間的 LDO 來給容許的 USB 供(gong)(gong)電(dian)(dian)，以暫停(ting)向應(ying)用(yong)電(dian)(dian)路輸送電(dian)(dian)流。為(wei)了(le)消除(chu)從(cong)制(zhi)造到(dao)銷售過(guo)程中的電(dian)(dian)池消耗(hao)，一種“裝運及貯存”特性可將已(yi)經很低的電(dian)(dian)池待機電(dian)(dian)流減(jian)小(xiao)至接近于零。

　　LTC4155 采用(yong)扁平 (0.75mm) 28 引腳(jiao) 4mm x 5mm QFN 封裝，在 -40C 至 85C 的溫度(du)范圍內(nei)工作有保證。千片批購價為(wei)每片 4.07 美元。如需(xu)更多(duo)信息，請登錄 www.linear.com.cn/product/LTC4155。

　　性能(neng)概(gai)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(shi)開關穩壓器可(ke)最佳利用有限的可(ke)用輸入功率

　　?具有針對多個輸入而進行優先級多路(lu)復(fu)用功能的(de)雙通道、過壓(ya)保(bao)護控制(zhi)器

　　?輸入過壓保護

　　?I2C / SMBus 控制實(shi)現(xian)最(zui)佳(jia)系(xi)統性能并提(ti)供(gong)狀態信(xin)息

　　?在低電池電量(liang)時(shi)即時(shi)接(jie)通工作

　　?電池理想二(er)極(ji)管控(kong)制器(qi)實(shi)現(xian)電源管理

　　?從電池(chi)到(dao) USB 端口的 USB OTG供電

　　?過熱(re)電池查驗器

　　?具 4 種浮(fu)置電壓(ya)設置的全(quan)功能鋰離子/聚合物(wu)充(chong)電器

　　?從交流適配器(qi)提供 3.5A 最大充電(dian)電(dian)流

　　?支持 USB 2.0 和(he) USB 3.0 規范

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