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(yong)了(le)一(yi)個3.3V浮(fu)動(dong)電(dian)壓(ya)反饋基準，因此可以使用(yong)一(yi)個電(dian)阻分壓(ya)器來設置任(ren)何期望并可高(gao)達14.4V的電(dian)池浮(fu)動(dong)電(dian)壓(ya)。

LT3652運用了一(yi)個(ge)輸(shu)入(ru)電(dian)(dian)(dian)(dian)壓(ya)(ya)調節(jie)環路，如果輸(shu)入(ru)電(dian)(dian)(dian)(dian)壓(ya)(ya)降至(zhi)一(yi)個(ge)編程電(dian)(dian)(dian)(dian)平(ping)(由一(yi)個(ge)電(dian)(dian)(dian)(dian)阻分壓(ya)(ya)器來設定)以下，則(ze)該輸(shu)入(ru)電(dian)(dian)(dian)(dian)壓(ya)(ya)調節(jie)環路將減小充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流。當LT3652由一(yi)塊太(tai)陽(yang)能電(dian)(dian)(dian)(dian)池板(ban)來供電(dian)(dian)(dian)(dian)時，輸(shu)入(ru)調節(jie)環路將用于把太(tai)陽(yang)能電(dian)(dian)(dian)(dian)池板(ban)保持在峰值輸(shu)出功率。

可以(yi)通過配置使LT3652在充(chong)(chong)(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流降(jiang)至編(bian)程最大值(zhi)的(de)1/10(C/10)以(yi)下(xia)時終(zhong)止充(chong)(chong)(chong)電(dian)(dian)(dian)操作(zuo)(zuo)。當充(chong)(chong)(chong)電(dian)(dian)(dian)操作(zuo)(zuo)終(zhong)止時，LT3652將(jiang)(jiang)進入一(yi)(yi)種(zhong)低電(dian)(dian)(dian)流(85μA)待機模(mo)式。如果電(dian)(dian)(dian)池電(dian)(dian)(dian)壓下(xia)降(jiang)至編(bian)程浮動電(dian)(dian)(dian)壓以(yi)下(xia)達2.5%，則一(yi)(yi)種(zhong)自(zi)動再充(chong)(chong)(chong)電(dian)(dian)(dian)功能將(jiang)(jiang)起動一(yi)(yi)個新的(de)充(chong)(chong)(chong)電(dian)(dian)(dian)周期(qi)。LT3652還包含一(yi)(yi)個可編(bian)程安全定時器，用于在到達一(yi)(yi)個期(qi)望時間(jian)之后終(zhong)止充(chong)(chong)(chong)電(dian)(dian)(dian)操作(zuo)(zuo)。這(zhe)在電(dian)(dian)(dian)流小于C/10的(de)條件下(xia)提供了“Top-Off”型(xing)充(chong)(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(qi)車系統