凌力爾特(te)公(gong)司 (Linear Technology Corporation) 推出(chu)大(da)功(gong)(gong)(gong)率、I2C 控制(zhi)和高(gao)效率的(de)電源通路 (PowerPath?) 管理(li)(li)器(qi)(qi)、理(li)(li)想二極管控制(zhi)器(qi)(qi)及磷酸(suan)鐵鋰 (LiFePO4) 電池(chi)(chi)充電器(qi)(qi) LTC4156，該器(qi)(qi)件(jian)適用(yong)于單節電池(chi)(chi)設備，例(li)(li)如(ru)便攜式醫療(liao)和工業設備、備份設備以及其他高(gao)功(gong)(gong)(gong)率密度電池(chi)(chi)供電應用(yong)。該 IC 可(ke)高(gao)效地(di)(di)從各種電源傳輸高(gao)達(da) 15W 的(de)功(gong)(gong)(gong)率，同時最大(da)限度地(di)(di)降低(di)功(gong)(gong)(gong)耗并(bing)減輕熱量的(de)限制(zhi)。LTC4156 的(de)開關電源通路拓撲(pu)結構可(ke)無縫地(di)(di)管理(li)(li)從兩個(ge)(ge)輸入源 (例(li)(li)如(ru)：一(yi)個(ge)(ge)墻上適配器(qi)(qi)和 USB 端口) 至器(qi)(qi)件(jian)的(de)可(ke)再充 LiFePO4 電池(chi)(chi)的(de)功(gong)(gong)(gong)率輸送，并(bing)在輸入功(gong)(gong)(gong)率有限時優(you)先(xian)向(xiang)系統負載供電。

因為 LTC4156 節省了功率(lv)，所以該器(qi)(qi)件允(yun)許輸出負載電(dian)(dian)(dian)(dian)(dian)(dian)流超過(guo)輸入電(dian)(dian)(dian)(dian)(dian)(dian)源吸取的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)流，從而能(neng)最大(da)限(xian)度地利用(yong)可(ke)用(yong)功率(lv)給電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)，而不(bu)會超出輸入電(dian)(dian)(dian)(dian)(dian)(dian)源供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)規(gui)范的(de)(de)要求。例(li)如(ru)，當從一個(ge) 5V/2A 交流適配器(qi)(qi)供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)時(shi)，該 IC 的(de)(de)開(kai)關穩壓器(qi)(qi)高效地將(jiang)可(ke)用(yong) 10W的(de)(de) 90% 以上之功率(lv)傳(chuan)送出去，從而可(ke)提供(gong)高達 2.4A 的(de)(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流，并實現較快的(de)(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)速度。與普通開(kai)關電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)不(bu)同，LTC4156 的(de)(de)特點(dian)是(shi)即時(shi)接通工作，以確(que)保即使電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)已深(shen)度放電(dian)(dian)(dian)(dian)(dian)(dian)，一插(cha)上電(dian)(dian)(dian)(dian)(dian)(dian)源插(cha)頭時(shi)就有(you)系統電(dian)(dian)(dian)(dian)(dian)(dian)源。該器(qi)(qi)件支持(chi) USB OTG (On-The-Go)，因此無(wu)需任何額外組件，就可(ke)以反過(guo)來向 USB 端口提供(gong)一個(ge) 5V 電(dian)(dian)(dian)(dian)(dian)(dian)源。

通過一個簡單的兩線 I2C 端口，可在電路板上調整很多系統控制參數，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 (3.45V、3.55V、3.60V 和3.80V)。該通信總線也允許 LTC4156 提供狀態信息，例如電池溫度、輸入電源狀態、充電器狀態和(he)故障狀態信息。

LTC4156 的(de)自主型全(quan)功(gong)能單(dan)節 LiFePO4 電(dian)(dian)(dian)(dian)(dian)池充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)器能夠提供高達 3.5A 的(de)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)和 15 種充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)設(she)定值。該充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)器具備(bei)自動再充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)、失(shi)效(xiao)電(dian)(dian)(dian)(dian)(dian)池檢測、可(ke)編(bian)程安全(quan)定時器、熱敏電(dian)(dian)(dian)(dian)(dian)阻(zu)適宜溫度充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)、可(ke)編(bian)程充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)結(jie)束(shu)指示 / 終止、以及可(ke)編(bian)程中斷(duan)發(fa)生等(deng)功(gong)能。

LTC4156 的(de)(de)(de)(de)(de)雙(shuang)路輸入、優先級(ji)多路復(fu)用過(guo)壓保護 (OVP) 電(dian)路可(ke)(ke)避免因意外施加高電(dian)壓而造成的(de)(de)(de)(de)(de)任何損壞。其理想二(er)極管控制(zhi)(zhi)器可(ke)(ke)確保始終能夠(gou)(gou)向 VOUT 提(ti)供(gong)足夠(gou)(gou)的(de)(de)(de)(de)(de)功率，即使在(zai)輸入功率不足或缺(que)失的(de)(de)(de)(de)(de)情況(kuang)下也不例(li)外。為最大限(xian)度地減少當器件連接至(zhi)一個暫停模式 USB 端口(kou)時的(de)(de)(de)(de)(de)漏電(dian)流(liu)(liu)，由(you)一個布設在(zai) VBUS 與(yu) VOUT 之間的(de)(de)(de)(de)(de) LDO 給應(ying)用提(ti)供(gong)可(ke)(ke)容許的(de)(de)(de)(de)(de)暫停模式 USB 電(dian)流(liu)(liu)。為了(le)消除從制(zhi)(zhi)造到(dao)銷(xiao)售過(guo)程(cheng)中的(de)(de)(de)(de)(de)電(dian)池消耗，一種“裝運(yun)及貯存(cun)”特性(xing)可(ke)(ke)將已經很低的(de)(de)(de)(de)(de)電(dian)池待機電(dian)流(liu)(liu)減小至(zhi)接近(jin)于零。LTC4156 為 LTC4155 提(ti)供(gong)了(le)補充(chong)，后者擁(yong)有針對鋰離子 / 鋰聚合物(wu)電(dian)池供(gong)電(dian)型系(xi)統(tong)的(de)(de)(de)(de)(de)相同特性(xing)集。

LTC4156 采(cai)用扁平 (0.75mm) 28 引腳 4mm x 5mm QFN 封(feng)裝，保證在 -40°C 至 125°C 的溫度(du)范(fan)圍(wei)內工作。千片批購價為(wei)每片 4.07 美元。

照片(pian)說明：具 OVP 和 USB OTG 的高效率 I2C 電源管理器及(ji) 3.5A LiFePO4 電池充電器

性能概要：LTC4156

?大功率、高效率開關型 LiFePO4 電池充電器能可提供 3.5A 充電電流

?單(dan)片開關穩(wen)壓(ya)器可(ke)對有(you)限的(de)可(ke)用輸(shu)入功(gong)率之利用進行(xing)優化(hua)

?雙(shuang)輸(shu)入過壓(ya)保護控制器

?優先(xian)級多(duo)路(lu)復用(yong)適用(yong)于多(duo)輸入

?I2C/SMBus 控制以實現最佳系統性能并提供狀態信息

?在(zai)電(dian)池(chi)電(dian)量很低(di)時即時接通(tong)工作

?電池(chi)理想二極管(guan)控制(zhi)器以實現電源管(guan)理

?從(cong)電池到(dao) USB 端口提供 USB OTG 供電

?全功能磷(lin)酸鐵鋰充電器具 4 種浮(fu)置(zhi)電壓(ya)設置(zhi) (3.45V、3.55V、3.60V 和 3.80V)

?用交流適(shi)配(pei)器提供 3.5A 最大充電電流

?支(zhi)持 USB 2.0 和 USB 3.0 規范

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