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3.3V浮(fu)動(dong)電壓反饋基準(zhun)，因(yin)此可(ke)以(yi)使用一(yi)個電阻分壓器來設置任何期望并可(ke)高達14.4V的電池浮(fu)動(dong)電壓。

LT3652運用了一個輸入電(dian)(dian)(dian)壓調節(jie)環路(lu)，如果輸入電(dian)(dian)(dian)壓降至一個編程(cheng)電(dian)(dian)(dian)平(由一個電(dian)(dian)(dian)阻分壓器(qi)來(lai)(lai)設定)以下，則該輸入電(dian)(dian)(dian)壓調節(jie)環路(lu)將(jiang)減(jian)小充電(dian)(dian)(dian)電(dian)(dian)(dian)流。當LT3652由一塊太陽(yang)能電(dian)(dian)(dian)池板(ban)來(lai)(lai)供電(dian)(dian)(dian)時，輸入調節(jie)環路(lu)將(jiang)用于把(ba)太陽(yang)能電(dian)(dian)(dian)池板(ban)保(bao)持(chi)在峰(feng)值輸出功(gong)率。

可(ke)以通過(guo)配置使LT3652在(zai)(zai)充(chong)(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流降(jiang)至(zhi)編(bian)程(cheng)最(zui)大值(zhi)的1/10(C/10)以下時終(zhong)止(zhi)(zhi)充(chong)(chong)電(dian)(dian)(dian)操作。當充(chong)(chong)電(dian)(dian)(dian)操作終(zhong)止(zhi)(zhi)時，LT3652將進(jin)入一種低(di)電(dian)(dian)(dian)流(85μA)待機(ji)模式。如果(guo)電(dian)(dian)(dian)池電(dian)(dian)(dian)壓(ya)下降(jiang)至(zhi)編(bian)程(cheng)浮動電(dian)(dian)(dian)壓(ya)以下達2.5%，則一種自動再充(chong)(chong)電(dian)(dian)(dian)功能將起動一個新的充(chong)(chong)電(dian)(dian)(dian)周期(qi)。LT3652還包含(han)一個可(ke)編(bian)程(cheng)安全(quan)定時器，用于(yu)在(zai)(zai)到達一個期(qi)望時間(jian)之后終(zhong)止(zhi)(zhi)充(chong)(chong)電(dian)(dian)(dian)操作。這在(zai)(zai)電(dian)(dian)(dian)流小于(yu)C/10的條件下提供了“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(feng)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)系統