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(yi)個(ge)3.3V浮(fu)動(dong)電壓(ya)(ya)反饋(kui)基(ji)準，因此(ci)可(ke)(ke)以使(shi)用一(yi)個(ge)電阻分壓(ya)(ya)器來設(she)置(zhi)任何期望并(bing)可(ke)(ke)高達14.4V的電池浮(fu)動(dong)電壓(ya)(ya)。

LT3652運(yun)用了一個(ge)(ge)輸(shu)入(ru)電(dian)(dian)(dian)(dian)壓調(diao)節環(huan)路，如果輸(shu)入(ru)電(dian)(dian)(dian)(dian)壓降至一個(ge)(ge)編程電(dian)(dian)(dian)(dian)平(由一個(ge)(ge)電(dian)(dian)(dian)(dian)阻分(fen)壓器來設定)以下，則該輸(shu)入(ru)電(dian)(dian)(dian)(dian)壓調(diao)節環(huan)路將(jiang)(jiang)減小(xiao)充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流。當LT3652由一塊太(tai)陽(yang)能(neng)電(dian)(dian)(dian)(dian)池板來供(gong)電(dian)(dian)(dian)(dian)時，輸(shu)入(ru)調(diao)節環(huan)路將(jiang)(jiang)用于(yu)把太(tai)陽(yang)能(neng)電(dian)(dian)(dian)(dian)池板保持在峰值(zhi)輸(shu)出功率。

可(ke)(ke)以(yi)通過配置使LT3652在(zai)充(chong)(chong)電(dian)(dian)電(dian)(dian)流降至(zhi)編程(cheng)最大值(zhi)的(de)1/10(C/10)以(yi)下時(shi)終止充(chong)(chong)電(dian)(dian)操(cao)作。當充(chong)(chong)電(dian)(dian)操(cao)作終止時(shi)，LT3652將(jiang)進入(ru)一(yi)(yi)種低電(dian)(dian)流(85μA)待機(ji)模式。如果電(dian)(dian)池電(dian)(dian)壓下降至(zhi)編程(cheng)浮動電(dian)(dian)壓以(yi)下達2.5%，則一(yi)(yi)種自動再(zai)充(chong)(chong)電(dian)(dian)功能將(jiang)起動一(yi)(yi)個(ge)新的(de)充(chong)(chong)電(dian)(dian)周期。LT3652還包含(han)一(yi)(yi)個(ge)可(ke)(ke)編程(cheng)安全定(ding)時(shi)器，用(yong)于在(zai)到達一(yi)(yi)個(ge)期望(wang)時(shi)間之后終止充(chong)(chong)電(dian)(dian)操(cao)作。這在(zai)電(dian)(dian)流小于C/10的(de)條件下提(ti)供了(le)“Top-Off”型充(chong)(chong)電(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(zhi)24V汽車系統