凌(ling)力爾特公(gong)司 (Linear Technology CorporatiON) 推出一款(kuan)大功(gong)率、I2C 控制(zhi)(zhi)、高效率電(dian)(dian)(dian)(dian)源通路 (PowerPathTM) 管(guan)理器(qi)、理想二極管(guan)控制(zhi)(zhi)器(qi)和(he)(he)鋰(li)(li)離(li)子電(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)器(qi) LTC4155，該器(qi)件適(shi)用于(yu)諸如平(ping)板 PC、超移動(dong) PC (UMPC)、個人視頻播放器(qi)、智(zhi)能電(dian)(dian)(dian)(dian)話(hua)、數碼相機、PDA、便攜式醫療和(he)(he)工業設(she)備(bei)、以及個人導航設(she)備(bei)等(deng)單節(jie)電(dian)(dian)(dian)(dian)池便攜式設(she)備(bei)。該 IC 設(she)計用于(yu)從(cong)多種電(dian)(dian)(dian)(dian)源高效地(di)(di)輸送高達 15W 的(de)功(gong)率，同時最大限度地(di)(di)降低功(gong)耗并放寬熱預(yu)算限制(zhi)(zhi)條件。LTC4155 的(de)開(kai)關 PowerPath 拓撲(pu)無(wu)縫地(di)(di)管(guan)理諸如交流適(shi)配(pei)器(qi)和(he)(he) USB 端口這樣兩個輸入電(dian)(dian)(dian)(dian)源到設(she)備(bei)的(de)可再充電(dian)(dian)(dian)(dian)鋰(li)(li)離(li)子電(dian)(dian)(dian)(dian)池的(de)電(dian)(dian)(dian)(dian)源分配(pei)，同時在輸入功(gong)率有限時，優先(xian)向系統負載供電(dian)(dian)(dian)(dian)。

　　因為 LTC4155 節省了功(gong)(gong)率，所以(yi)該器(qi)件允許輸(shu)(shu)出(chu)(chu)負載電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)超(chao)過(guo)(guo)輸(shu)(shu)入(ru)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)吸取的(de)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)，從(cong)而能最大(da)限(xian)度地利用可(ke)(ke)用功(gong)(gong)率給電(dian)(dian)(dian)(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)，而不會超(chao)出(chu)(chu)輸(shu)(shu)入(ru)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)規范的(de)要求。例如，當從(cong)一(yi)個 5V/2A 交流(liu)適配器(qi)供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)時，該 IC 的(de)開關穩壓器(qi)高(gao)效地將(jiang)可(ke)(ke)用 10W 功(gong)(gong)率的(de) 90% 以(yi)上傳(chuan)送出(chu)(chu)去，從(cong)而實現了高(gao)達 2.4A 的(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)，并實現了更快的(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)速(su)度。與普通開關電(dian)(dian)(dian)(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)不同，LTC4155 的(de)特(te)點(dian)是即時接通工(gong)作，以(yi)確保即使電(dian)(dian)(dian)(dian)(dian)(dian)池已深度放電(dian)(dian)(dian)(dian)(dian)(dian)，一(yi)插上電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)插頭時就有系統電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)。該器(qi)件支持 USB On-The-Go (USB OTG)，因此無需(xu)任何額(e)外組件，就可(ke)(ke)以(yi)反過(guo)(guo)來(lai)向(xiang) USB 端口提供(gong) 5V 電(dian)(dian)(dian)(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(yi)及故障狀態等的狀態信息。

　　LTC4155 的自(zi)主型全功能(neng)單節鋰離(li)子(zi) / 聚(ju)合物(wu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器能(neng)提供高達 3.5A 的充(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(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)設置(zhi)(zhi)和 15 種充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流設置(zhi)(zhi)。為了改善(shan)安全裕度(du)，集成的過熱電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)查驗電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)可以(yi)有選擇地降低電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)，以(yi)防高電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)溫度(du)和高電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)同時出現。此(ci)外，該充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器具有自(zi)動再充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)、壞電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)檢(jian)測、涓流充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)、可編(bian)程(cheng)(cheng)安全定(ding)時器、熱敏電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻溫度(du)合格(ge)的充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)、可編(bian)程(cheng)(cheng)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)結束指示 / 終止、以(yi)及可編(bian)程(cheng)(cheng)中斷發生等功能(neng)。

LTC4155 的(de)(de)(de)(de)(de)雙(shuang)輸(shu)出、優先級(ji)多路(lu)復用過壓保護 (OVP) 電(dian)(dian)路(lu)可(ke)避免(mian)因意(yi)外(wai)施加(jia)高電(dian)(dian)壓而造(zao)成的(de)(de)(de)(de)(de)任何(he)損壞。其理想二極(ji)管(guan)控制(zhi)(zhi)器(qi)可(ke)確保始(shi)終能夠向(xiang) VOUT 提供足夠的(de)(de)(de)(de)(de)功率(lv)，即使在輸(shu)入功率(lv)不(bu)足或缺失的(de)(de)(de)(de)(de)情況下也不(bu)例外(wai)。為(wei)最大限度地減(jian)少當(dang)器(qi)件連接至一(yi)個暫停(ting) USB 端(duan)口時的(de)(de)(de)(de)(de)電(dian)(dian)池(chi)消(xiao)耗，由一(yi)個布設在 VBUS 與 VOUT 之間的(de)(de)(de)(de)(de) LDO 來給(gei)容許的(de)(de)(de)(de)(de) USB 供電(dian)(dian)，以暫停(ting)向(xiang)應(ying)用電(dian)(dian)路(lu)輸(shu)送電(dian)(dian)流。為(wei)了消(xiao)除從(cong)制(zhi)(zhi)造(zao)到銷售過程中的(de)(de)(de)(de)(de)電(dian)(dian)池(chi)消(xiao)耗，一(yi)種“裝(zhuang)運(yun)及貯(zhu)存”特性可(ke)將已(yi)經很(hen)低的(de)(de)(de)(de)(de)電(dian)(dian)池(chi)待機電(dian)(dian)流減(jian)小至接近于零。

　　LTC4155 采(cai)用扁平(ping) (0.75mm) 28 引腳(jiao) 4mm x 5mm QFN 封裝，在 -40C 至 85C 的溫(wen)度范圍內工作有保證。千片(pian)批(pi)購價為每片(pian) 4.07 美元。如需更多信息，請(qing)登(deng)錄 www.linear.com.cn/product/LTC4155。

　　性能概要(yao)：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(dan)片式開關穩壓器(qi)可最佳利用有(you)限的可用輸入功率(lv)

　　?具(ju)有針對多個輸(shu)入而進(jin)行(xing)優先級多路(lu)復用功能的雙(shuang)通道、過壓保護控制器

　　?輸入過壓保護

　　?I2C / SMBus 控(kong)制實(shi)現(xian)最佳系統性能并提供狀態信息

　　?在低電池電量時(shi)即時(shi)接通工作

　　?電(dian)池理(li)想二極管控制(zhi)器(qi)實現電(dian)源管理(li)

　　?從電池到(dao) USB 端口的 USB OTG供電

　　?過熱電池查驗(yan)器

　　?具(ju) 4 種浮置(zhi)(zhi)電壓設置(zhi)(zhi)的全功能鋰離子/聚(ju)合物(wu)充(chong)電器

　　?從交流適配器提供 3.5A 最大(da)充(chong)電電流

　　?支持 USB 2.0 和(he) USB 3.0 規范

　　?扁平 (0.75mm) 28 引線 4mm x 5mm QFN 封裝