凌力爾特公司 (Linear Technology CorporatiON) 推出一款大功(gong)率(lv)、I2C 控制(zhi)(zhi)、高效率(lv)電(dian)(dian)(dian)源通路 (PowerPathTM) 管理(li)器(qi)、理(li)想二(er)極管控制(zhi)(zhi)器(qi)和鋰離子(zi)(zi)電(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)器(qi) LTC4155，該器(qi)件適(shi)用(yong)于諸如平板 PC、超移動 PC (UMPC)、個人視頻(pin)播放器(qi)、智能電(dian)(dian)(dian)話、數碼相機、PDA、便攜式(shi)醫療(liao)和工業設備、以及(ji)個人導航(hang)設備等單節電(dian)(dian)(dian)池(chi)便攜式(shi)設備。該 IC 設計用(yong)于從多種(zhong)電(dian)(dian)(dian)源高效地(di)輸送高達(da) 15W 的(de)功(gong)率(lv)，同(tong)時最大限度地(di)降低功(gong)耗并(bing)放寬(kuan)熱(re)預(yu)算(suan)限制(zhi)(zhi)條件。LTC4155 的(de)開關(guan) PowerPath 拓撲無縫地(di)管理(li)諸如交流適(shi)配器(qi)和 USB 端口這(zhe)樣(yang)兩個輸入電(dian)(dian)(dian)源到設備的(de)可再(zai)充電(dian)(dian)(dian)鋰離子(zi)(zi)電(dian)(dian)(dian)池(chi)的(de)電(dian)(dian)(dian)源分(fen)配，同(tong)時在輸入功(gong)率(lv)有限時，優先向系(xi)統負載供電(dian)(dian)(dian)。

　　因為(wei) LTC4155 節省了功(gong)率，所以該器件(jian)允許輸(shu)(shu)(shu)出(chu)(chu)負載電(dian)(dian)(dian)(dian)流超過輸(shu)(shu)(shu)入(ru)電(dian)(dian)(dian)(dian)源(yuan)吸取的(de)電(dian)(dian)(dian)(dian)流，從(cong)而能最大限度(du)地利用(yong)可(ke)(ke)用(yong)功(gong)率給(gei)電(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)，而不會超出(chu)(chu)輸(shu)(shu)(shu)入(ru)電(dian)(dian)(dian)(dian)源(yuan)供(gong)電(dian)(dian)(dian)(dian)規(gui)范的(de)要求(qiu)。例(li)如，當從(cong)一(yi)個 5V/2A 交流適配器供(gong)電(dian)(dian)(dian)(dian)時，該 IC 的(de)開(kai)關穩壓器高效地將可(ke)(ke)用(yong) 10W 功(gong)率的(de) 90% 以上傳送出(chu)(chu)去，從(cong)而實(shi)現了高達 2.4A 的(de)充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流，并實(shi)現了更快的(de)充電(dian)(dian)(dian)(dian)速度(du)。與普(pu)通開(kai)關電(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)器不同，LTC4155 的(de)特點是(shi)即(ji)時接(jie)通工作，以確保即(ji)使電(dian)(dian)(dian)(dian)池已(yi)深度(du)放電(dian)(dian)(dian)(dian)，一(yi)插上電(dian)(dian)(dian)(dian)源(yuan)插頭(tou)時就(jiu)有系統(tong)電(dian)(dian)(dian)(dian)源(yuan)。該器件(jian)支(zhi)持 USB On-The-Go (USB OTG)，因此無(wu)需任何額外(wai)組件(jian)，就(jiu)可(ke)(ke)以反過來向 USB 端(duan)口(kou)提供(gong) 5V 電(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、充電器狀態(tai)(tai)(tai)、以及故(gu)障狀態(tai)(tai)(tai)等的狀態(tai)(tai)(tai)信息(xi)。

　　LTC4155 的自主型全功能單節鋰離子 / 聚合物(wu)電(dian)(dian)(dian)池(chi)(chi)充(chong)電(dian)(dian)(dian)器(qi)能提供(gong)高(gao)達 3.5A 的充(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流(liu)以(yi)及(ji) 4 種浮置電(dian)(dian)(dian)壓(ya)設置和 15 種充(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流(liu)設置。為了改(gai)善安(an)全裕(yu)度，集(ji)成的過熱(re)電(dian)(dian)(dian)池(chi)(chi)查驗電(dian)(dian)(dian)路可(ke)以(yi)有選擇地降低電(dian)(dian)(dian)池(chi)(chi)電(dian)(dian)(dian)壓(ya)，以(yi)防高(gao)電(dian)(dian)(dian)池(chi)(chi)溫(wen)度和高(gao)電(dian)(dian)(dian)池(chi)(chi)電(dian)(dian)(dian)壓(ya)同時(shi)出現。此外(wai)，該充(chong)電(dian)(dian)(dian)器(qi)具有自動再充(chong)電(dian)(dian)(dian)、壞(huai)電(dian)(dian)(dian)池(chi)(chi)檢測、涓(juan)流(liu)充(chong)電(dian)(dian)(dian)、可(ke)編程安(an)全定時(shi)器(qi)、熱(re)敏電(dian)(dian)(dian)阻溫(wen)度合格的充(chong)電(dian)(dian)(dian)、可(ke)編程充(chong)電(dian)(dian)(dian)結束指示 / 終止、以(yi)及(ji)可(ke)編程中斷(duan)發生等功能。

LTC4155 的(de)雙輸出、優先級多(duo)路(lu)復(fu)用過壓(ya)保(bao)護 (OVP) 電(dian)(dian)(dian)(dian)路(lu)可(ke)避免因意外(wai)施加高電(dian)(dian)(dian)(dian)壓(ya)而造成(cheng)的(de)任何(he)損(sun)壞(huai)。其理想(xiang)二極管控制器(qi)可(ke)確保(bao)始終能夠向 VOUT 提供足(zu)夠的(de)功(gong)率(lv)，即使(shi)在輸入(ru)功(gong)率(lv)不(bu)足(zu)或缺失(shi)的(de)情況下也不(bu)例外(wai)。為(wei)最(zui)大(da)限度(du)地減少當器(qi)件連接(jie)至(zhi)一(yi)個暫(zan)停(ting) USB 端口(kou)時的(de)電(dian)(dian)(dian)(dian)池(chi)消(xiao)耗(hao)，由一(yi)個布設在 VBUS 與(yu) VOUT 之間(jian)的(de) LDO 來給容許的(de) USB 供電(dian)(dian)(dian)(dian)，以暫(zan)停(ting)向應用電(dian)(dian)(dian)(dian)路(lu)輸送(song)電(dian)(dian)(dian)(dian)流。為(wei)了消(xiao)除從制造到銷(xiao)售過程中(zhong)的(de)電(dian)(dian)(dian)(dian)池(chi)消(xiao)耗(hao)，一(yi)種“裝(zhuang)運(yun)及(ji)貯存”特性可(ke)將已(yi)經(jing)很低的(de)電(dian)(dian)(dian)(dian)池(chi)待(dai)機電(dian)(dian)(dian)(dian)流減小至(zhi)接(jie)近于零。

　　LTC4155 采(cai)用(yong)扁平 (0.75mm) 28 引腳 4mm x 5mm QFN 封裝，在 -40C 至 85C 的溫度范圍內工作(zuo)有保證。千片批購價為每片 4.07 美元。如需更(geng)多信(xin)息，請登錄(lu) 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

　　?單片式開關穩壓器(qi)可最佳(jia)利用(yong)有限(xian)的可用(yong)輸(shu)入功率(lv)

　　?具有針(zhen)對(dui)多(duo)個(ge)輸入而進行優先級多(duo)路復用功能的雙通(tong)道、過壓保護(hu)控制器

　　?輸入過壓保護

　　?I2C / SMBus 控(kong)制(zhi)實現(xian)最佳(jia)系(xi)統性能并提(ti)供狀態信息

　　?在(zai)低電池電量時即時接通工(gong)作

　　?電池理想二極管(guan)控制器實現電源管(guan)理

　　?從電池到(dao) USB 端口的 USB OTG供電

　　?過(guo)熱電(dian)池(chi)查驗器

　　?具 4 種浮置(zhi)電(dian)壓設(she)置(zhi)的全(quan)功能鋰(li)離子(zi)/聚合物充電(dian)器

　　?從交(jiao)流(liu)適配器提供 3.5A 最大充電(dian)電(dian)流(liu)

　　?支(zhi)持 USB 2.0 和(he) USB 3.0 規范(fan)

　　?扁平(ping) (0.75mm) 28 引線 4mm x 5mm QFN 封裝(zhuang)