凌(ling)力爾特(te)公司 (Linear Technology CorporatiON) 推出一款大功(gong)率(lv)、I2C 控(kong)制(zhi)、高(gao)效(xiao)率(lv)電(dian)(dian)(dian)(dian)源(yuan)通路 (PowerPathTM) 管(guan)理器(qi)(qi)、理想二極管(guan)控(kong)制(zhi)器(qi)(qi)和鋰離子電(dian)(dian)(dian)(dian)池(chi)(chi)充電(dian)(dian)(dian)(dian)器(qi)(qi) LTC4155，該器(qi)(qi)件適用(yong)于(yu)諸如平板 PC、超移動 PC (UMPC)、個人視頻播(bo)放器(qi)(qi)、智(zhi)能電(dian)(dian)(dian)(dian)話、數(shu)碼相機、PDA、便攜式醫療和工業設(she)(she)備、以(yi)及(ji)個人導航(hang)設(she)(she)備等單節電(dian)(dian)(dian)(dian)池(chi)(chi)便攜式設(she)(she)備。該 IC 設(she)(she)計用(yong)于(yu)從多(duo)種(zhong)電(dian)(dian)(dian)(dian)源(yuan)高(gao)效(xiao)地輸(shu)(shu)送高(gao)達(da) 15W 的功(gong)率(lv)，同時最大限(xian)度地降低(di)功(gong)耗并(bing)放寬熱(re)預算限(xian)制(zhi)條件。LTC4155 的開關 PowerPath 拓撲無縫地管(guan)理諸如交流適配器(qi)(qi)和 USB 端口這樣兩(liang)個輸(shu)(shu)入電(dian)(dian)(dian)(dian)源(yuan)到設(she)(she)備的可再充電(dian)(dian)(dian)(dian)鋰離子電(dian)(dian)(dian)(dian)池(chi)(chi)的電(dian)(dian)(dian)(dian)源(yuan)分配，同時在輸(shu)(shu)入功(gong)率(lv)有限(xian)時，優先向(xiang)系統(tong)負載供電(dian)(dian)(dian)(dian)。

　　因(yin)為 LTC4155 節省(sheng)了功率，所(suo)以該器(qi)件(jian)(jian)允許輸(shu)出(chu)負載電(dian)(dian)流超過(guo)輸(shu)入(ru)電(dian)(dian)源(yuan)吸取的(de)(de)(de)電(dian)(dian)流，從(cong)而(er)能最(zui)大限(xian)度地(di)利用可(ke)用功率給(gei)電(dian)(dian)池(chi)充(chong)電(dian)(dian)，而(er)不(bu)會超出(chu)輸(shu)入(ru)電(dian)(dian)源(yuan)供(gong)電(dian)(dian)規(gui)范的(de)(de)(de)要求。例如，當從(cong)一(yi)個(ge) 5V/2A 交流適(shi)配器(qi)供(gong)電(dian)(dian)時(shi)，該 IC 的(de)(de)(de)開(kai)關穩壓器(qi)高效(xiao)地(di)將可(ke)用 10W 功率的(de)(de)(de) 90% 以上傳送出(chu)去(qu)，從(cong)而(er)實現了高達 2.4A 的(de)(de)(de)充(chong)電(dian)(dian)電(dian)(dian)流，并實現了更快(kuai)的(de)(de)(de)充(chong)電(dian)(dian)速度。與普通開(kai)關電(dian)(dian)池(chi)充(chong)電(dian)(dian)器(qi)不(bu)同，LTC4155 的(de)(de)(de)特點(dian)是即時(shi)接(jie)通工作，以確(que)保(bao)即使電(dian)(dian)池(chi)已(yi)深度放(fang)電(dian)(dian)，一(yi)插上電(dian)(dian)源(yuan)插頭(tou)時(shi)就有系統電(dian)(dian)源(yuan)。該器(qi)件(jian)(jian)支(zhi)持 USB On-The-Go (USB OTG)，因(yin)此無(wu)需(xu)任何額外組件(jian)(jian)，就可(ke)以反過(guo)來(lai)向 USB 端口提供(gong) 5V 電(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)態(tai)(tai)、以及故障狀(zhuang)態(tai)(tai)等(deng)的狀(zhuang)態(tai)(tai)信息。

　　LTC4155 的(de)自(zi)主型(xing)全(quan)功能(neng)(neng)單節鋰離子 / 聚合物電(dian)(dian)(dian)(dian)池(chi)(chi)充(chong)電(dian)(dian)(dian)(dian)器(qi)能(neng)(neng)提供高達 3.5A 的(de)充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流以(yi)(yi)及(ji) 4 種(zhong)浮置(zhi)電(dian)(dian)(dian)(dian)壓設置(zhi)和(he) 15 種(zhong)充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流設置(zhi)。為了改善(shan)安(an)(an)全(quan)裕度，集(ji)成的(de)過熱電(dian)(dian)(dian)(dian)池(chi)(chi)查驗電(dian)(dian)(dian)(dian)路(lu)可(ke)(ke)以(yi)(yi)有(you)選擇(ze)地降低電(dian)(dian)(dian)(dian)池(chi)(chi)電(dian)(dian)(dian)(dian)壓，以(yi)(yi)防高電(dian)(dian)(dian)(dian)池(chi)(chi)溫(wen)度和(he)高電(dian)(dian)(dian)(dian)池(chi)(chi)電(dian)(dian)(dian)(dian)壓同時(shi)出現。此外，該充(chong)電(dian)(dian)(dian)(dian)器(qi)具(ju)有(you)自(zi)動再充(chong)電(dian)(dian)(dian)(dian)、壞電(dian)(dian)(dian)(dian)池(chi)(chi)檢測(ce)、涓流充(chong)電(dian)(dian)(dian)(dian)、可(ke)(ke)編(bian)(bian)程(cheng)安(an)(an)全(quan)定時(shi)器(qi)、熱敏(min)電(dian)(dian)(dian)(dian)阻溫(wen)度合格的(de)充(chong)電(dian)(dian)(dian)(dian)、可(ke)(ke)編(bian)(bian)程(cheng)充(chong)電(dian)(dian)(dian)(dian)結束(shu)指示(shi) / 終止、以(yi)(yi)及(ji)可(ke)(ke)編(bian)(bian)程(cheng)中斷發生等功能(neng)(neng)。

LTC4155 的(de)(de)(de)(de)(de)雙輸(shu)(shu)出、優先級多路(lu)復(fu)用(yong)過壓保(bao)護 (OVP) 電(dian)(dian)路(lu)可(ke)避免因意(yi)外(wai)施加高電(dian)(dian)壓而(er)造成的(de)(de)(de)(de)(de)任(ren)何損壞。其(qi)理想二極管(guan)控制器可(ke)確(que)保(bao)始終能(neng)夠向(xiang) VOUT 提供(gong)足(zu)夠的(de)(de)(de)(de)(de)功率，即使在輸(shu)(shu)入功率不(bu)足(zu)或缺失的(de)(de)(de)(de)(de)情況下(xia)也不(bu)例外(wai)。為最大限度地(di)減少當器件(jian)連接至一(yi)(yi)個暫(zan)停 USB 端口時(shi)的(de)(de)(de)(de)(de)電(dian)(dian)池(chi)消(xiao)耗(hao)，由一(yi)(yi)個布設(she)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(gong)電(dian)(dian)，以(yi)暫(zan)停向(xiang)應用(yong)電(dian)(dian)路(lu)輸(shu)(shu)送電(dian)(dian)流(liu)。為了消(xiao)除從制造到(dao)銷售過程中的(de)(de)(de)(de)(de)電(dian)(dian)池(chi)消(xiao)耗(hao)，一(yi)(yi)種“裝運(yun)及貯存(cun)”特性可(ke)將已(yi)經(jing)很低的(de)(de)(de)(de)(de)電(dian)(dian)池(chi)待機電(dian)(dian)流(liu)減小(xiao)至接近于零。

　　LTC4155 采用扁平 (0.75mm) 28 引(yin)腳 4mm x 5mm QFN 封(feng)裝(zhuang)，在 -40C 至 85C 的溫度范(fan)圍內(nei)工(gong)作有保(bao)證。千片(pian)批購(gou)價為每片(pian) 4.07 美元。如需更(geng)多信息，請登錄 www.linear.com.cn/product/LTC4155。

　　性(xing)能概(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

　　?單片式開關穩(wen)壓器可最佳利(li)用有限的可用輸入功率(lv)

　　?具有針對多個輸入(ru)而進行優先級多路(lu)復(fu)用功能的(de)雙通道(dao)、過壓保護控制器

　　?輸入過壓保護

　　?I2C / SMBus 控制(zhi)實(shi)現最佳系統性(xing)能并提供(gong)狀態(tai)信息(xi)

　　?在(zai)低電池電量(liang)時(shi)即(ji)時(shi)接通工作

　　?電池理(li)想二極管控制器實現(xian)電源管理(li)

　　?從(cong)電池到 USB 端口的 USB OTG供電

　　?過熱電池(chi)查驗器

　　?具 4 種浮(fu)置(zhi)電壓設(she)置(zhi)的全功能鋰離子/聚合物(wu)充電器

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

　　?支持 USB 2.0 和 USB 3.0 規范

　　?扁平 (0.75mm) 28 引線 4mm x 5mm QFN 封裝