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)3.3V浮動電(dian)壓反饋(kui)基準，因此可(ke)以使用一個(ge)電(dian)阻分壓器來設(she)置任(ren)何期望(wang)并可(ke)高達14.4V的電(dian)池浮動電(dian)壓。

LT3652運用了一(yi)個(ge)輸(shu)(shu)入(ru)電(dian)(dian)(dian)(dian)壓(ya)調(diao)節(jie)環路，如果輸(shu)(shu)入(ru)電(dian)(dian)(dian)(dian)壓(ya)降至一(yi)個(ge)編程電(dian)(dian)(dian)(dian)平(由一(yi)個(ge)電(dian)(dian)(dian)(dian)阻分壓(ya)器來設定)以下(xia)，則該輸(shu)(shu)入(ru)電(dian)(dian)(dian)(dian)壓(ya)調(diao)節(jie)環路將減小充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流。當(dang)LT3652由一(yi)塊太(tai)陽能電(dian)(dian)(dian)(dian)池板(ban)來供(gong)電(dian)(dian)(dian)(dian)時，輸(shu)(shu)入(ru)調(diao)節(jie)環路將用于把太(tai)陽能電(dian)(dian)(dian)(dian)池板(ban)保(bao)持在(zai)峰值(zhi)輸(shu)(shu)出功率。

可(ke)以(yi)通過配置使LT3652在充(chong)(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流(liu)(liu)降至編(bian)(bian)程最大值的(de)(de)1/10(C/10)以(yi)下時(shi)終(zhong)止(zhi)充(chong)(chong)電(dian)(dian)(dian)操作(zuo)(zuo)。當充(chong)(chong)電(dian)(dian)(dian)操作(zuo)(zuo)終(zhong)止(zhi)時(shi)，LT3652將進入一種低電(dian)(dian)(dian)流(liu)(liu)(85μA)待(dai)機模式。如(ru)果電(dian)(dian)(dian)池電(dian)(dian)(dian)壓下降至編(bian)(bian)程浮動電(dian)(dian)(dian)壓以(yi)下達2.5%，則一種自動再充(chong)(chong)電(dian)(dian)(dian)功能將起動一個(ge)新(xin)的(de)(de)充(chong)(chong)電(dian)(dian)(dian)周期。LT3652還(huan)包(bao)含一個(ge)可(ke)編(bian)(bian)程安全(quan)定時(shi)器，用(yong)于在到(dao)達一個(ge)期望(wang)時(shi)間之后(hou)終(zhong)止(zhi)充(chong)(chong)電(dian)(dian)(dian)操作(zuo)(zuo)。這(zhe)在電(dian)(dian)(dian)流(liu)(liu)小于C/10的(de)(de)條件下提供了“Top-Off”型(xing)充(chong)(chong)電(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汽車(che)系(xi)統