凌力爾特公司 (Linear Technology CorporatiON) 推出一款大(da)(da)功(gong)(gong)率(lv)(lv)、I2C 控制(zhi)、高(gao)效率(lv)(lv)電(dian)(dian)源(yuan)通路 (PowerPathTM) 管理(li)器、理(li)想二極管控制(zhi)器和鋰離子電(dian)(dian)池(chi)(chi)充電(dian)(dian)器 LTC4155，該器件適用于諸如(ru)平板(ban) PC、超移(yi)動 PC (UMPC)、個(ge)(ge)人(ren)視(shi)頻播(bo)放(fang)器、智能(neng)電(dian)(dian)話、數(shu)碼相機、PDA、便(bian)攜(xie)式醫療和工業設(she)備(bei)、以及個(ge)(ge)人(ren)導(dao)航(hang)設(she)備(bei)等單(dan)節電(dian)(dian)池(chi)(chi)便(bian)攜(xie)式設(she)備(bei)。該 IC 設(she)計用于從多種電(dian)(dian)源(yuan)高(gao)效地(di)輸(shu)送高(gao)達 15W 的功(gong)(gong)率(lv)(lv)，同時(shi)最(zui)大(da)(da)限度地(di)降低功(gong)(gong)耗并放(fang)寬熱(re)預(yu)算限制(zhi)條件。LTC4155 的開關 PowerPath 拓撲無(wu)縫地(di)管理(li)諸如(ru)交(jiao)流適配器和 USB 端口這樣兩個(ge)(ge)輸(shu)入電(dian)(dian)源(yuan)到設(she)備(bei)的可(ke)再充電(dian)(dian)鋰離子電(dian)(dian)池(chi)(chi)的電(dian)(dian)源(yuan)分配，同時(shi)在輸(shu)入功(gong)(gong)率(lv)(lv)有限時(shi)，優先向系統負載供電(dian)(dian)。

　　因為(wei) LTC4155 節省了功(gong)(gong)率(lv)，所以(yi)該器(qi)(qi)件(jian)允許(xu)輸(shu)出負載電(dian)(dian)(dian)(dian)流超(chao)過(guo)(guo)輸(shu)入電(dian)(dian)(dian)(dian)源(yuan)吸(xi)取的(de)電(dian)(dian)(dian)(dian)流，從而能最(zui)大限度地利用可(ke)用功(gong)(gong)率(lv)給電(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)，而不會超(chao)出輸(shu)入電(dian)(dian)(dian)(dian)源(yuan)供(gong)電(dian)(dian)(dian)(dian)規(gui)范(fan)的(de)要(yao)求(qiu)。例如(ru)，當從一個 5V/2A 交(jiao)流適(shi)配器(qi)(qi)供(gong)電(dian)(dian)(dian)(dian)時，該 IC 的(de)開關穩壓器(qi)(qi)高(gao)效地將可(ke)用 10W 功(gong)(gong)率(lv)的(de) 90% 以(yi)上傳(chuan)送(song)出去，從而實現(xian)了高(gao)達 2.4A 的(de)充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流，并(bing)實現(xian)了更快的(de)充電(dian)(dian)(dian)(dian)速度。與普通(tong)開關電(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)器(qi)(qi)不同，LTC4155 的(de)特點是(shi)即時接通(tong)工作(zuo)，以(yi)確保即使電(dian)(dian)(dian)(dian)池已深(shen)度放電(dian)(dian)(dian)(dian)，一插(cha)上電(dian)(dian)(dian)(dian)源(yuan)插(cha)頭時就有(you)系統電(dian)(dian)(dian)(dian)源(yuan)。該器(qi)(qi)件(jian)支持 USB On-The-Go (USB OTG)，因此(ci)無需任何(he)額(e)外組(zu)件(jian)，就可(ke)以(yi)反過(guo)(guo)來向 USB 端口(kou)提(ti)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(zhuang)態(tai)(tai)、以(yi)及(ji)故障狀(zhuang)態(tai)(tai)等的狀(zhuang)態(tai)(tai)信息(xi)。

　　LTC4155 的自主型全(quan)功能單節(jie)鋰離子(zi) / 聚合物電(dian)(dian)(dian)(dian)(dian)(dian)池充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)能提供(gong)高達 3.5A 的充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流以及 4 種(zhong)浮置(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)壓設置(zhi)和 15 種(zhong)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流設置(zhi)。為了改善安全(quan)裕度，集(ji)成(cheng)的過熱電(dian)(dian)(dian)(dian)(dian)(dian)池查(cha)驗電(dian)(dian)(dian)(dian)(dian)(dian)路可(ke)(ke)以有選(xuan)擇(ze)地降低電(dian)(dian)(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)(dian)(dian)壓，以防高電(dian)(dian)(dian)(dian)(dian)(dian)池溫度和高電(dian)(dian)(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)(dian)(dian)壓同時出現。此(ci)外，該充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)具(ju)有自動再充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)、壞電(dian)(dian)(dian)(dian)(dian)(dian)池檢測(ce)、涓流充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)、可(ke)(ke)編(bian)程安全(quan)定時器(qi)、熱敏電(dian)(dian)(dian)(dian)(dian)(dian)阻溫度合格的充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)、可(ke)(ke)編(bian)程充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)結束指示(shi) / 終止、以及可(ke)(ke)編(bian)程中斷發(fa)生等功能。

LTC4155 的(de)(de)雙輸出、優(you)先級多路復用(yong)過壓保(bao)護(hu) (OVP) 電(dian)(dian)(dian)(dian)路可避免因(yin)意外施加高電(dian)(dian)(dian)(dian)壓而造(zao)成(cheng)的(de)(de)任何損壞。其理想二極管控制器可確保(bao)始終能夠(gou)向 VOUT 提供足夠(gou)的(de)(de)功率，即(ji)使在(zai)(zai)輸入功率不足或缺失的(de)(de)情況下也不例外。為(wei)最大限度地減(jian)少當器件連接至一個暫(zan)停 USB 端口時的(de)(de)電(dian)(dian)(dian)(dian)池消耗，由(you)一個布設在(zai)(zai) VBUS 與 VOUT 之間的(de)(de) LDO 來(lai)給容許的(de)(de) USB 供電(dian)(dian)(dian)(dian)，以暫(zan)停向應用(yong)電(dian)(dian)(dian)(dian)路輸送(song)電(dian)(dian)(dian)(dian)流(liu)。為(wei)了消除從制造(zao)到銷(xiao)售過程中的(de)(de)電(dian)(dian)(dian)(dian)池消耗，一種“裝運及貯存”特性可將已經很低的(de)(de)電(dian)(dian)(dian)(dian)池待機(ji)電(dian)(dian)(dian)(dian)流(liu)減(jian)小至接近于零。

　　LTC4155 采(cai)用扁平 (0.75mm) 28 引腳 4mm x 5mm QFN 封(feng)裝，在 -40C 至(zhi) 85C 的溫(wen)度(du)范圍內工(gong)作有保證。千片批購價(jia)為每(mei)片 4.07 美元。如需更多信息，請(qing)登(deng)錄 www.linear.com.cn/product/LTC4155。

　　性(xing)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(pian)式開關穩壓器可(ke)最佳利用(yong)有限的可(ke)用(yong)輸入功率(lv)

　　?具有針(zhen)對多(duo)個(ge)輸入而進行優先級多(duo)路復用(yong)功能(neng)的(de)雙通道、過壓(ya)保護控制(zhi)器(qi)

　　?輸入過壓保護

　　?I2C / SMBus 控制實現最佳系(xi)統性能并提(ti)供(gong)狀態信息(xi)

　　?在低電(dian)池電(dian)量時即時接通工(gong)作

　　?電(dian)(dian)池理(li)想二極管控制器實現電(dian)(dian)源管理(li)

　　?從電(dian)池到 USB 端口的(de) USB OTG供電(dian)

　　?過熱電池(chi)查驗器

　　?具(ju) 4 種浮置電(dian)壓設置的全功能鋰離子/聚合物充電(dian)器

　　?從交流適配(pei)器提供 3.5A 最大充電電流

　　?支持(chi) USB 2.0 和 USB 3.0 規(gui)范

　　?扁平 (0.75mm) 28 引線 4mm x 5mm QFN 封裝