LT3652描述
LT?3652是一款完整的單片式、降壓型電池充電器，可在4.95V至32V的輸入電壓范圍內運作。LT3652提供了一種恒定電流/恒定電壓充電特性，最大充電電流可在外部設置至高達2A。該充電器采用了一個(ge)(ge)3.3V浮動(dong)電(dian)(dian)壓反饋基(ji)準(zhun)，因此可以使用一個(ge)(ge)電(dian)(dian)阻(zu)分壓器來設置任(ren)何期望(wang)并可高(gao)達14.4V的電(dian)(dian)池浮動(dong)電(dian)(dian)壓。

LT3652運(yun)用了一個(ge)(ge)輸(shu)(shu)入(ru)(ru)電(dian)壓(ya)(ya)調節環路(lu)，如(ru)果輸(shu)(shu)入(ru)(ru)電(dian)壓(ya)(ya)降至一個(ge)(ge)編程(cheng)電(dian)平(由一個(ge)(ge)電(dian)阻分壓(ya)(ya)器來設定)以下，則(ze)該輸(shu)(shu)入(ru)(ru)電(dian)壓(ya)(ya)調節環路(lu)將(jiang)減小充電(dian)電(dian)流。當LT3652由一塊太(tai)(tai)陽能(neng)電(dian)池板來供電(dian)時(shi)，輸(shu)(shu)入(ru)(ru)調節環路(lu)將(jiang)用于把(ba)太(tai)(tai)陽能(neng)電(dian)池板保持在峰值(zhi)輸(shu)(shu)出(chu)功率(lv)。

可(ke)以通過配置(zhi)使(shi)LT3652在(zai)充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)降至(zhi)(zhi)編程(cheng)最(zui)大值的1/10(C/10)以下(xia)(xia)時(shi)終止充(chong)電(dian)(dian)(dian)(dian)操(cao)(cao)作。當充(chong)電(dian)(dian)(dian)(dian)操(cao)(cao)作終止時(shi)，LT3652將進入(ru)一(yi)種低電(dian)(dian)(dian)(dian)流(liu)(85μA)待機模(mo)式(shi)。如果(guo)電(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)壓(ya)下(xia)(xia)降至(zhi)(zhi)編程(cheng)浮動(dong)電(dian)(dian)(dian)(dian)壓(ya)以下(xia)(xia)達(da)2.5%，則一(yi)種自動(dong)再充(chong)電(dian)(dian)(dian)(dian)功能將起動(dong)一(yi)個(ge)新(xin)的充(chong)電(dian)(dian)(dian)(dian)周(zhou)期(qi)。LT3652還包含一(yi)個(ge)可(ke)編程(cheng)安全定(ding)時(shi)器，用于(yu)在(zai)到達(da)一(yi)個(ge)期(qi)望時(shi)間之后(hou)終止充(chong)電(dian)(dian)(dian)(dian)操(cao)(cao)作。這在(zai)電(dian)(dian)(dian)(dian)流(liu)小于(yu)C/10的條件(jian)下(xia)(xia)提供了(le)“Top-Off”型充(chong)電(dian)(dian)(dian)(dian)。

LT3652特點
用于太陽能應用中峰值功率跟蹤(MPPT)的輸入電源電壓調節環路
寬輸入電壓范圍：4.95V至32V(40V絕對最大值)
可編程充電速率高達2A
可由用戶選擇的充電終止：C/10或內置充電終止定時器
可采用電阻器設置并高達14.4V的浮動電壓能迎合鋰離子/鋰聚合物電池、LiFePO4(磷酸鐵鋰)電池、SLA(密封鉛酸)電池、NiMH/NiCd(鎳氫/鎳鎘)電池化學組成
當電池電壓≤4.2V時無需VIN隔離二極管
1MHz固定頻率
0.5%浮動電壓基準準確度
5%充電電流準確度
2.5%C/10檢測準確度
二進制編碼集電極開路狀態引腳
3mmx3mmDFN12或MSOP-12封裝

LT3652封裝
DFN-12

LT3652應用
太陽能供電型應用
遠程監視系統
LiFePO4(磷酸鐵鋰)電池供電型應用
便攜手持式儀器
12V至24V汽(qi)車系統