4A 單片同步降壓型電池充電器
該器件面向單節鋰離子/聚合物電池應用。LT3651-4.2 接受高達 32V 的輸入,并具 40V 最大絕對額定值以增加系統裕度。充電電流可編程至高達 4A,而且是動態可調節的,而充分集成的同步電源電路最大限度地降低了功耗并節省了電路板空間。用戶可選定時器或 C/10 終止無需外部微控制器,簡化了設計。LT3651-4.2 不需要外部高準確度電阻器來設定浮置電壓,從而進一步節省了成本和空間。應用包括工業手持式儀表、12V 至 24V 汽車和重型設備應用、臺式插座充電器以及筆記本或平板(ban)電(dian)腦。
LT3651-4.2 的可(ke)(ke)編(bian)程開關頻率 (200kHz 至(zhi)(zhi) 1MHz) 使(shi)設計師能平衡解決方(fang)案尺寸(cun)、功率損(sun)耗和(he)濾(lv)波需求。同步工(gong)作實現(xian)了高(gao)達 90% 的充(chong)(chong)電(dian)(dian)(dian)(dian)效率。最終浮(fu)置電(dian)(dian)(dian)(dian)壓準確(que)度為 ±0.5%,充(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)準確(que)度為 ±7.5%,以及(ji) C/10 檢測準確(que)度為 ±4%。一旦充(chong)(chong)電(dian)(dian)(dian)(dian)終止,LT3651-4.2 就(jiu)自動(dong)地進入(ru)(ru)低電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)備用(yong)模式,該模式將輸入(ru)(ru)電(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)降至(zhi)(zhi) 80uA。停機時,輸入(ru)(ru)偏置電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)降至(zhi)(zhi) 15uA。由(you)于(yu)在所(suo)有非(fei)充(chong)(chong)電(dian)(dian)(dian)(dian)周期中(zhong)僅從電(dian)(dian)(dian)(dian)池泄漏 <1uA 的電(dian)(dian)(dian)(dian)流(liu)(liu)(liu),所(suo)以 LT3651-4.2 可(ke)(ke)最大限度地延長電(dian)(dian)(dian)(dian)池壽命。就(jiu)安全性(xing)和(he)自主(zhu)充(chong)(chong)電(dian)(dian)(dian)(dian)控制(zhi)而言,該器件包括自動(dong)重啟和(he)預處理、一個用(yong)于(yu)溫(wen)度合(he)格充(chong)(chong)電(dian)(dian)(dian)(dian)的熱敏電(dian)(dian)(dian)(dian)阻輸入(ru)(ru)、可(ke)(ke)編(bian)程輸入(ru)(ru)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)限制(zhi)、壞電(dian)(dian)(dian)(dian)池檢測以及(ji)二進制(zhi)編(bian)碼的狀(zhuang)態輸出引腳。
LT3651-4.2 采用扁平(ping) (0.75mm) 36 引腳 5mm x 6mm QFN 封裝,同(tong)時(shi)提供 E 級(ji)和(he)I 級(ji)版(ban)(ban)本(ben),保證工(gong)作在 -40°C 至 125°C 溫度范圍。千片(pian)(pian)批購(gou)價(jia)分別為每(mei)片(pian)(pian) 4.13 美元和(he) 4.75 美元。兩節(jie) 8.2V 和(he) 8.4V 版(ban)(ban)本(ben)以及一節(jie) 4.1V 版(ban)(ban)本(ben)計劃在未(wei)來 2 至 3 個月內推出(chu)。
照片說明: 32V、4A 同步單片式單節鋰離子電池充電器
性能概要:LT3651-4.2
寬(kuan)輸入電壓范(fan)圍:4.75V 至 32V (40V 絕(jue)對最大額定值)
可編程(cheng)充(chong)電(dian)電(dian)流高達 4A
單節鋰離子(zi)/聚合物電池(chi)充電功能,4.2V 充電電壓
同步整流提(ti)高充電效率
用戶可選終(zhong)止:C/10 或可編程終(zhong)止定時器
可編程開(kai)關(guan)頻率(lv) (200kHz 至 1MHz)
可(ke)編(bian)程(cheng)輸入電流限(xian)制
±0.5% 充(chong)電(dian)電(dian)壓準確度
±7.5% 充電(dian)電(dian)流(liu)準確度
±4% C/10 檢測準確度
NTC 電阻器(qi)溫度監視器(qi)
自動再充電
自動預處理
二(er)進制編碼(ma)集電極開(kai)路(lu)充電狀(zhuang)態引腳(jiao)
具(ju)自(zi)動復位的壞電池(chi)檢(jian)測
扁平 (0.75mm) 5mm x 6mm QFN-36 封(feng)裝