凌力爾特公司 (Linear Technology Corporation) 推出(chu)大功(gong)率、I2C 控(kong)制和高效(xiao)率的(de)電(dian)(dian)(dian)源(yuan)(yuan)通路(lu) (PowerPath?) 管(guan)理器(qi)(qi)(qi)、理想二極管(guan)控(kong)制器(qi)(qi)(qi)及磷酸(suan)鐵鋰 (LiFePO4) 電(dian)(dian)(dian)池(chi)(chi)充電(dian)(dian)(dian)器(qi)(qi)(qi) LTC4156，該器(qi)(qi)(qi)件適用于單節電(dian)(dian)(dian)池(chi)(chi)設(she)(she)備(bei)，例如(ru)(ru)便攜(xie)式(shi)醫療和工業設(she)(she)備(bei)、備(bei)份(fen)設(she)(she)備(bei)以及其他(ta)高功(gong)率密度電(dian)(dian)(dian)池(chi)(chi)供(gong)(gong)電(dian)(dian)(dian)應用。該 IC 可(ke)(ke)高效(xiao)地(di)(di)從各種(zhong)電(dian)(dian)(dian)源(yuan)(yuan)傳輸高達(da) 15W 的(de)功(gong)率，同時最大限(xian)度地(di)(di)降低功(gong)耗并(bing)減輕熱量(liang)的(de)限(xian)制。LTC4156 的(de)開關電(dian)(dian)(dian)源(yuan)(yuan)通路(lu)拓撲結構可(ke)(ke)無縫地(di)(di)管(guan)理從兩個輸入源(yuan)(yuan) (例如(ru)(ru)：一個墻(qiang)上(shang)適配器(qi)(qi)(qi)和 USB 端口(kou)) 至(zhi)器(qi)(qi)(qi)件的(de)可(ke)(ke)再(zai)充 LiFePO4 電(dian)(dian)(dian)池(chi)(chi)的(de)功(gong)率輸送，并(bing)在輸入功(gong)率有限(xian)時優先向(xiang)系統負(fu)載供(gong)(gong)電(dian)(dian)(dian)。

因為 LTC4156 節省了(le)功(gong)率(lv)，所以(yi)該器(qi)件(jian)允(yun)許輸出(chu)負載電(dian)(dian)(dian)(dian)流超過輸入(ru)電(dian)(dian)(dian)(dian)源(yuan)(yuan)吸取(qu)的電(dian)(dian)(dian)(dian)流，從(cong)而(er)能最大限(xian)度地利用可(ke)用功(gong)率(lv)給電(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)(dian)(dian)，而(er)不會超出(chu)輸入(ru)電(dian)(dian)(dian)(dian)源(yuan)(yuan)供(gong)(gong)電(dian)(dian)(dian)(dian)規范(fan)的要(yao)求。例如，當從(cong)一(yi)個(ge) 5V/2A 交流適配器(qi)供(gong)(gong)電(dian)(dian)(dian)(dian)時(shi)(shi)，該 IC 的開關(guan)(guan)穩壓(ya)器(qi)高效地將可(ke)用 10W的 90% 以(yi)上之(zhi)功(gong)率(lv)傳送出(chu)去(qu)，從(cong)而(er)可(ke)提供(gong)(gong)高達 2.4A 的充(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流，并實(shi)現(xian)較快的充(chong)(chong)電(dian)(dian)(dian)(dian)速度。與普通開關(guan)(guan)電(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)(dian)(dian)器(qi)不同，LTC4156 的特點是即時(shi)(shi)接(jie)通工(gong)作(zuo)，以(yi)確保即使電(dian)(dian)(dian)(dian)池(chi)已深度放電(dian)(dian)(dian)(dian)，一(yi)插上電(dian)(dian)(dian)(dian)源(yuan)(yuan)插頭時(shi)(shi)就(jiu)(jiu)有系(xi)統電(dian)(dian)(dian)(dian)源(yuan)(yuan)。該器(qi)件(jian)支(zhi)持 USB OTG (On-The-Go)，因此無需任何額外組件(jian)，就(jiu)(jiu)可(ke)以(yi)反過來向 USB 端(duan)口提供(gong)(gong)一(yi)個(ge) 5V 電(dian)(dian)(dian)(dian)源(yuan)(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(tai)和故障(zhang)狀態(tai)信息。

LTC4156 的(de)自主(zhu)型全功能單節 LiFePO4 電(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)器(qi)能夠提供高達(da) 3.5A 的(de)充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流和 15 種充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流設定值。該充(chong)電(dian)(dian)(dian)(dian)器(qi)具備自動再(zai)充(chong)電(dian)(dian)(dian)(dian)、失效電(dian)(dian)(dian)(dian)池(chi)檢測、可編程(cheng)安全定時器(qi)、熱(re)敏(min)電(dian)(dian)(dian)(dian)阻適宜溫度充(chong)電(dian)(dian)(dian)(dian)、可編程(cheng)充(chong)電(dian)(dian)(dian)(dian)結束指(zhi)示 / 終(zhong)止、以及可編程(cheng)中(zhong)斷發(fa)生等功能。

LTC4156 的(de)(de)雙路輸入(ru)、優先級多(duo)路復用過壓保護 (OVP) 電(dian)(dian)(dian)(dian)路可(ke)(ke)避免因意外施加高電(dian)(dian)(dian)(dian)壓而造成的(de)(de)任何損(sun)壞。其(qi)理想二極管控制器可(ke)(ke)確(que)保始終能夠(gou)向 VOUT 提(ti)(ti)(ti)供足夠(gou)的(de)(de)功(gong)率，即使在輸入(ru)功(gong)率不(bu)足或缺(que)失的(de)(de)情況(kuang)下(xia)也不(bu)例外。為最(zui)大限度(du)地減少當(dang)器件(jian)連(lian)接(jie)至一(yi)個(ge)暫停(ting)模式(shi) USB 端口時的(de)(de)漏電(dian)(dian)(dian)(dian)流，由一(yi)個(ge)布設(she)在 VBUS 與(yu) VOUT 之(zhi)間的(de)(de) LDO 給(gei)應(ying)用提(ti)(ti)(ti)供可(ke)(ke)容許的(de)(de)暫停(ting)模式(shi) USB 電(dian)(dian)(dian)(dian)流。為了消除從制造到銷售過程中的(de)(de)電(dian)(dian)(dian)(dian)池消耗，一(yi)種“裝運及貯存”特性可(ke)(ke)將(jiang)已經很(hen)低的(de)(de)電(dian)(dian)(dian)(dian)池待機電(dian)(dian)(dian)(dian)流減小至接(jie)近(jin)于零。LTC4156 為 LTC4155 提(ti)(ti)(ti)供了補(bu)充，后者擁有針對鋰離子 / 鋰聚合物電(dian)(dian)(dian)(dian)池供電(dian)(dian)(dian)(dian)型系(xi)統的(de)(de)相同特性集。

LTC4156 采用扁平 (0.75mm) 28 引腳 4mm x 5mm QFN 封裝，保證在 -40°C 至(zhi) 125°C 的溫度(du)范圍內工作。千片批購價為每片 4.07 美元。

照(zhao)片說明：具 OVP 和(he) USB OTG 的高效率 I2C 電(dian)源管理器(qi)及(ji) 3.5A LiFePO4 電(dian)池充電(dian)器(qi)

性能概要：LTC4156

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

?單片開(kai)關(guan)穩壓器可對有限的可用(yong)輸入功率之(zhi)利用(yong)進行優化

?雙輸入過壓保護控制(zhi)器

?優先級多路復用適用于(yu)多輸入

?I2C/SMBus 控制以實現最佳系統性能并提供(gong)狀(zhuang)態信(xin)息(xi)

?在電池(chi)電量(liang)很低時即時接(jie)通(tong)工作(zuo)

?電池理想二極(ji)管(guan)控制器以實現電源管(guan)理

?從(cong)電(dian)(dian)池(chi)到 USB 端口提供 USB OTG 供電(dian)(dian)

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

?用交流適(shi)配器提供 3.5A 最大充(chong)電(dian)電(dian)流

?支(zhi)持 USB 2.0 和 USB 3.0 規范

?扁平 (0.75mm) 28 引線 4mm x 5mm QFN 封裝