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(bi)記本或平板(ban)電腦(nao)。

　　LT3651-4.2 的可(ke)編(bian)(bian)程(cheng)開關頻率(lv) (200kHz 至(zhi)(zhi) 1MHz) 使(shi)設計師能平衡解決方案(an)尺寸、功率(lv)損耗(hao)和(he)(he)濾波需(xu)求(qiu)。同步(bu)工作(zuo)實現了高達 90% 的充電(dian)(dian)(dian)(dian)(dian)效(xiao)率(lv)。最(zui)終浮置電(dian)(dian)(dian)(dian)(dian)壓準確度(du)(du)(du)為 ±0.5%，充電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流準確度(du)(du)(du)為 ±7.5%，以(yi)及 C/10 檢(jian)測準確度(du)(du)(du)為 ±4%。一旦充電(dian)(dian)(dian)(dian)(dian)終止，LT3651-4.2 就(jiu)自動(dong)地進(jin)入(ru)(ru)低電(dian)(dian)(dian)(dian)(dian)流備用模式，該模式將輸(shu)(shu)入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)(dian)流降至(zhi)(zhi) 80uA。停機(ji)時，輸(shu)(shu)入(ru)(ru)偏置電(dian)(dian)(dian)(dian)(dian)流降至(zhi)(zhi) 15uA。由于(yu)在所(suo)有(you)非充電(dian)(dian)(dian)(dian)(dian)周期中僅從電(dian)(dian)(dian)(dian)(dian)池泄(xie)漏 <1uA 的電(dian)(dian)(dian)(dian)(dian)流，所(suo)以(yi) LT3651-4.2 可(ke)最(zui)大限(xian)度(du)(du)(du)地延(yan)長電(dian)(dian)(dian)(dian)(dian)池壽命。就(jiu)安全性和(he)(he)自主充電(dian)(dian)(dian)(dian)(dian)控制(zhi)(zhi)而言(yan)，該器件包括自動(dong)重啟和(he)(he)預處理、一個用于(yu)溫度(du)(du)(du)合格(ge)充電(dian)(dian)(dian)(dian)(dian)的熱敏電(dian)(dian)(dian)(dian)(dian)阻(zu)輸(shu)(shu)入(ru)(ru)、可(ke)編(bian)(bian)程(cheng)輸(shu)(shu)入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)流限(xian)制(zhi)(zhi)、壞電(dian)(dian)(dian)(dian)(dian)池檢(jian)測以(yi)及二(er)進(jin)制(zhi)(zhi)編(bian)(bian)碼的狀態輸(shu)(shu)出引腳。

　　LT3651-4.2 采用(yong)扁平 (0.75mm) 36 引腳 5mm x 6mm QFN 封裝，同(tong)時提供 E 級和(he)I 級版本，保證工作在 -40°C 至 125°C 溫度(du)范圍。千(qian)片批購價(jia)分別為(wei)每片 4.13 美(mei)元(yuan)和(he) 4.75 美(mei)元(yuan)。兩節(jie)(jie) 8.2V 和(he) 8.4V 版本以及一(yi)節(jie)(jie) 4.1V 版本計劃在未來 2 至 3 個(ge)月內推出。

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

　　寬輸入電壓范圍：4.75V 至(zhi) 32V (40V 絕對(dui)最(zui)大額定值)

　　可編程充(chong)電電流高(gao)達(da) 4A

　　單節鋰離子(zi)/聚合物電池充(chong)電功(gong)能，4.2V 充(chong)電電壓

　　同步整流(liu)提(ti)高充電效率

　　用戶(hu)可選(xuan)終(zhong)止：C/10 或可編程終(zhong)止定時器

　　可編程開關頻率 (200kHz 至 1MHz)

　　可編程輸入電流限制

　　±0.5% 充(chong)電電壓(ya)準確(que)度(du)

　　±7.5% 充電(dian)電(dian)流準確度

　　±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)集電極開路(lu)充電狀態引(yin)腳

　　具(ju)自(zi)動(dong)復(fu)位的壞電池(chi)檢(jian)測(ce)

　　扁平(ping) (0.75mm) 5mm x 6mm QFN-36 封裝