凌力(li)爾(er)特公司 (Linear Technology CorporatiON) 推出(chu)一(yi)款大(da)功(gong)率(lv)、I2C 控制(zhi)(zhi)、高效率(lv)電(dian)源(yuan)通路 (PowerPathTM) 管理器(qi)(qi)、理想(xiang)二極管控制(zhi)(zhi)器(qi)(qi)和鋰(li)離子電(dian)池(chi)充電(dian)器(qi)(qi) LTC4155，該(gai)器(qi)(qi)件適用于(yu)諸如平板 PC、超移動 PC (UMPC)、個人(ren)視頻播放(fang)器(qi)(qi)、智能電(dian)話、數碼相機、PDA、便攜式醫療(liao)和工(gong)業設備、以(yi)及個人(ren)導航(hang)設備等單(dan)節電(dian)池(chi)便攜式設備。該(gai) IC 設計(ji)用于(yu)從多種(zhong)電(dian)源(yuan)高效地(di)輸(shu)送高達 15W 的功(gong)率(lv)，同時最大(da)限(xian)度地(di)降低功(gong)耗并放(fang)寬熱預算(suan)限(xian)制(zhi)(zhi)條件。LTC4155 的開關(guan) PowerPath 拓(tuo)撲無縫地(di)管理諸如交(jiao)流適配器(qi)(qi)和 USB 端(duan)口這樣兩個輸(shu)入(ru)電(dian)源(yuan)到設備的可(ke)再(zai)充電(dian)鋰(li)離子電(dian)池(chi)的電(dian)源(yuan)分配，同時在輸(shu)入(ru)功(gong)率(lv)有(you)限(xian)時，優(you)先向系統負載供電(dian)。

　　因(yin)為 LTC4155 節省了功率(lv)，所以(yi)該器(qi)件(jian)允許輸出負載電(dian)(dian)(dian)流超(chao)過輸入(ru)電(dian)(dian)(dian)源(yuan)(yuan)吸取的(de)(de)(de)電(dian)(dian)(dian)流，從而能最大限(xian)度(du)(du)地(di)利用(yong)可(ke)(ke)用(yong)功率(lv)給電(dian)(dian)(dian)池充電(dian)(dian)(dian)，而不會超(chao)出輸入(ru)電(dian)(dian)(dian)源(yuan)(yuan)供(gong)(gong)電(dian)(dian)(dian)規范的(de)(de)(de)要求。例(li)如，當從一個 5V/2A 交流適配(pei)器(qi)供(gong)(gong)電(dian)(dian)(dian)時，該 IC 的(de)(de)(de)開關穩壓器(qi)高效地(di)將(jiang)可(ke)(ke)用(yong) 10W 功率(lv)的(de)(de)(de) 90% 以(yi)上(shang)傳(chuan)送出去(qu)，從而實現了高達(da) 2.4A 的(de)(de)(de)充電(dian)(dian)(dian)電(dian)(dian)(dian)流，并實現了更快的(de)(de)(de)充電(dian)(dian)(dian)速(su)度(du)(du)。與普通(tong)開關電(dian)(dian)(dian)池充電(dian)(dian)(dian)器(qi)不同，LTC4155 的(de)(de)(de)特點是即(ji)(ji)時接通(tong)工作，以(yi)確(que)保即(ji)(ji)使電(dian)(dian)(dian)池已深度(du)(du)放電(dian)(dian)(dian)，一插上(shang)電(dian)(dian)(dian)源(yuan)(yuan)插頭時就有系統電(dian)(dian)(dian)源(yuan)(yuan)。該器(qi)件(jian)支持 USB On-The-Go (USB OTG)，因(yin)此無需任何額外組(zu)件(jian)，就可(ke)(ke)以(yi)反過來向 USB 端口提供(gong)(gong) 5V 電(dian)(dian)(dian)源(yuan)(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、以及故障狀態等的狀態信息。

　　LTC4155 的(de)(de)(de)自主型(xing)全功能(neng)單(dan)節鋰(li)離子(zi) / 聚合物電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器能(neng)提供高(gao)達 3.5A 的(de)(de)(de)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流以(yi)及 4 種浮置電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)設(she)置和(he) 15 種充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流設(she)置。為(wei)了改(gai)善安全裕度(du)，集(ji)成的(de)(de)(de)過熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)查驗電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路可(ke)(ke)以(yi)有選(xuan)擇地降低電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)，以(yi)防高(gao)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)溫(wen)度(du)和(he)高(gao)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)同時(shi)(shi)出現。此(ci)外，該充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器具(ju)有自動再充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)、壞電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)檢測、涓流充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)、可(ke)(ke)編(bian)程安全定(ding)時(shi)(shi)器、熱(re)敏(min)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻溫(wen)度(du)合格的(de)(de)(de)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)、可(ke)(ke)編(bian)程充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)結(jie)束指示 / 終止、以(yi)及可(ke)(ke)編(bian)程中(zhong)斷發生等功能(neng)。

LTC4155 的(de)(de)(de)雙輸(shu)出、優先級多路復(fu)用過壓保護 (OVP) 電(dian)路可避免因(yin)意外(wai)施加高電(dian)壓而(er)造(zao)成的(de)(de)(de)任何損壞。其理想二極(ji)管控制(zhi)(zhi)器可確保始終能夠(gou)向 VOUT 提供(gong)足夠(gou)的(de)(de)(de)功率，即使(shi)在輸(shu)入功率不(bu)足或缺失的(de)(de)(de)情況下也不(bu)例(li)外(wai)。為最大限度(du)地減少當器件連接至一(yi)個暫(zan)停 USB 端口(kou)時的(de)(de)(de)電(dian)池消耗，由(you)一(yi)個布(bu)設在 VBUS 與 VOUT 之間(jian)的(de)(de)(de) LDO 來給容許的(de)(de)(de) USB 供(gong)電(dian)，以暫(zan)停向應用電(dian)路輸(shu)送電(dian)流。為了(le)消除(chu)從制(zhi)(zhi)造(zao)到銷售過程中(zhong)的(de)(de)(de)電(dian)池消耗，一(yi)種“裝運及貯存”特性(xing)可將已經很低的(de)(de)(de)電(dian)池待機電(dian)流減小至接近于零。

　　LTC4155 采(cai)用扁(bian)平(ping) (0.75mm) 28 引腳 4mm x 5mm QFN 封(feng)裝，在 -40C 至(zhi) 85C 的溫度(du)范(fan)圍內(nei)工作有保(bao)證。千片批購(gou)價為每(mei)片 4.07 美元。如需更多信息，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(kai)關穩壓器可最佳利用(yong)(yong)有限的可用(yong)(yong)輸(shu)入功率

　　?具(ju)有(you)針(zhen)對多個(ge)輸(shu)入而進行優先(xian)級多路復用功能的雙(shuang)通道(dao)、過壓保護控制(zhi)器

　　?輸入過壓保護

　　?I2C / SMBus 控(kong)制實(shi)現最佳(jia)系統性能并(bing)提供(gong)狀態(tai)信息

　　?在低電池(chi)電量時即(ji)時接通工(gong)作

　　?電池理想二極管(guan)控制器實現(xian)電源管(guan)理

　　?從電池(chi)到 USB 端口(kou)的 USB OTG供電

　　?過熱(re)電池查驗(yan)器(qi)

　　?具 4 種浮置電壓(ya)設(she)置的全(quan)功能鋰離子/聚合(he)物充電器

　　?從交流(liu)適配器提供 3.5A 最(zui)大充(chong)電電流(liu)

　　?支持(chi) USB 2.0 和 USB 3.0 規范

　　?扁平 (0.75mm) 28 引線 4mm x 5mm QFN 封裝