凌(ling)力(li)爾特公司 (Linear Technology Corporation) 推出(chu)大功率(lv)(lv)、I2C 控(kong)制和高(gao)(gao)效(xiao)(xiao)率(lv)(lv)的電(dian)(dian)(dian)源通路 (PowerPath?) 管(guan)理器(qi)、理想(xiang)二極管(guan)控(kong)制器(qi)及磷酸鐵鋰 (LiFePO4) 電(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)器(qi) LTC4156，該器(qi)件適用(yong)于單節電(dian)(dian)(dian)池(chi)設(she)備(bei)，例(li)如便攜式醫療和工(gong)業(ye)設(she)備(bei)、備(bei)份(fen)設(she)備(bei)以及其他高(gao)(gao)功率(lv)(lv)密(mi)度(du)電(dian)(dian)(dian)池(chi)供(gong)電(dian)(dian)(dian)應用(yong)。該 IC 可高(gao)(gao)效(xiao)(xiao)地(di)從(cong)各種電(dian)(dian)(dian)源傳輸高(gao)(gao)達 15W 的功率(lv)(lv)，同時(shi)最大限度(du)地(di)降低功耗并減(jian)輕熱量的限制。LTC4156 的開(kai)關電(dian)(dian)(dian)源通路拓撲結(jie)構可無縫地(di)管(guan)理從(cong)兩個(ge)輸入(ru)源 (例(li)如：一個(ge)墻上適配(pei)器(qi)和 USB 端口) 至器(qi)件的可再充 LiFePO4 電(dian)(dian)(dian)池(chi)的功率(lv)(lv)輸送，并在(zai)輸入(ru)功率(lv)(lv)有限時(shi)優先(xian)向(xiang)系統負(fu)載(zai)供(gong)電(dian)(dian)(dian)。

因為(wei) LTC4156 節省了(le)功率，所以(yi)該(gai)器(qi)件(jian)(jian)允許輸(shu)出(chu)負載電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流超過輸(shu)入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)吸(xi)取的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流，從而(er)能最大限度地(di)利用可用功率給電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，而(er)不會超出(chu)輸(shu)入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)供(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)規(gui)范的(de)(de)(de)要(yao)求。例如(ru)，當從一個(ge) 5V/2A 交流適(shi)配(pei)器(qi)供(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)時(shi)，該(gai) IC 的(de)(de)(de)開(kai)關(guan)穩壓(ya)器(qi)高(gao)效地(di)將可用 10W的(de)(de)(de) 90% 以(yi)上之功率傳送出(chu)去，從而(er)可提供(gong)(gong)高(gao)達 2.4A 的(de)(de)(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流，并實(shi)現較快的(de)(de)(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)速度。與普通(tong)(tong)開(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)不同(tong)，LTC4156 的(de)(de)(de)特點是即時(shi)接(jie)通(tong)(tong)工作，以(yi)確保(bao)即使電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)已深度放電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，一插上電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)插頭(tou)時(shi)就有(you)系統電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)。該(gai)器(qi)件(jian)(jian)支(zhi)持(chi) USB OTG (On-The-Go)，因此無需(xu)任何額外組件(jian)(jian)，就可以(yi)反過來向 USB 端(duan)口提供(gong)(gong)一個(ge) 5V 電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)。

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、充電器狀態和故障狀態信息。

LTC4156 的自主型全(quan)功能(neng)單節 LiFePO4 電(dian)池充(chong)電(dian)器能(neng)夠提供(gong)高(gao)達 3.5A 的充(chong)電(dian)電(dian)流和(he) 15 種充(chong)電(dian)電(dian)流設(she)定(ding)值。該充(chong)電(dian)器具(ju)備自動再充(chong)電(dian)、失效電(dian)池檢測(ce)、可(ke)編程安(an)全(quan)定(ding)時器、熱敏(min)電(dian)阻適宜溫度充(chong)電(dian)、可(ke)編程充(chong)電(dian)結束指示 / 終止、以及可(ke)編程中斷發生等(deng)功能(neng)。

LTC4156 的(de)(de)雙(shuang)路(lu)輸(shu)入、優先級多路(lu)復用過壓保(bao)護(hu) (OVP) 電(dian)(dian)路(lu)可避免因意外施加(jia)高電(dian)(dian)壓而造(zao)成的(de)(de)任何損壞(huai)。其(qi)理想二極管控制器可確(que)保(bao)始終能(neng)夠(gou)向(xiang) VOUT 提(ti)供足夠(gou)的(de)(de)功率(lv)，即使在(zai)輸(shu)入功率(lv)不足或缺失的(de)(de)情(qing)況下也不例外。為(wei)最大限度地減少當器件(jian)連接至一個暫停(ting)模(mo)式(shi)(shi) USB 端口時的(de)(de)漏電(dian)(dian)流(liu)，由一個布(bu)設在(zai) VBUS 與 VOUT 之(zhi)間的(de)(de) LDO 給應用提(ti)供可容(rong)許的(de)(de)暫停(ting)模(mo)式(shi)(shi) USB 電(dian)(dian)流(liu)。為(wei)了消除從制造(zao)到銷(xiao)售過程中(zhong)的(de)(de)電(dian)(dian)池(chi)消耗，一種(zhong)“裝運(yun)及(ji)貯存”特性可將已經很低的(de)(de)電(dian)(dian)池(chi)待機電(dian)(dian)流(liu)減小(xiao)至接近于零。LTC4156 為(wei) LTC4155 提(ti)供了補充，后者擁(yong)有(you)針對鋰離子 / 鋰聚合物電(dian)(dian)池(chi)供電(dian)(dian)型系統的(de)(de)相同特性集。

LTC4156 采用(yong)扁平(ping) (0.75mm) 28 引腳 4mm x 5mm QFN 封裝，保證在 -40°C 至 125°C 的溫度范圍(wei)內工作。千片(pian)批購價(jia)為每(mei)片(pian) 4.07 美元。

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

性(xing)能(neng)概要：LTC4156

?大功率、高效率開關型 LiFePO4 電池充電器能可提(ti)供(gong) 3.5A 充電(dian)電(dian)流

?單片(pian)開關穩壓器(qi)可對有(you)限(xian)的可用(yong)輸入功率之利(li)用(yong)進行優化

?雙輸(shu)入過(guo)壓(ya)保護控制器(qi)

?優先(xian)級多(duo)路復用(yong)適用(yong)于多(duo)輸(shu)入

?I2C/SMBus 控(kong)制以實現最佳系統性能并提供狀態信息

?在電(dian)池電(dian)量很低時(shi)(shi)即時(shi)(shi)接通工作

?電池理(li)想二極管(guan)控制器以實現電源管(guan)理(li)

?從電池到(dao) USB 端口提供 USB OTG 供電

?全功能磷酸(suan)鐵(tie)鋰充(chong)電器具 4 種浮置電壓設置 (3.45V、3.55V、3.60V 和(he) 3.80V)

?用(yong)交流適配器提供 3.5A 最大充電電流

?支(zhi)持 USB 2.0 和 USB 3.0 規范(fan)

?扁平 (0.75mm) 28 引線 4mm x 5mm QFN 封裝