4A 單片同步降壓型電池充電器 LT3651-4.2，該器件面向單節(jie)(jie)鋰(li)離子/聚合(he)物電(dian)(dian)(dian)池(chi)應(ying)用(yong)(yong)。LT3651-4.2 接受(shou)高達(da) 32V 的(de)(de)輸入，并具 40V 最(zui)大絕對(dui)額定值以增加系統裕(yu)度。充電(dian)(dian)(dian)電(dian)(dian)(dian)流(liu)可編程至(zhi)高達(da) 4A，而且是動態可調節(jie)(jie)的(de)(de)，而充分集成的(de)(de)同步電(dian)(dian)(dian)源電(dian)(dian)(dian)路最(zui)大限(xian)度地降低了(le)功耗并節(jie)(jie)省了(le)電(dian)(dian)(dian)路板空(kong)間(jian)。用(yong)(yong)戶可選定時器或(huo) C/10 終止無(wu)需外部微(wei)控制器，簡化了(le)設(she)計(ji)。LT3651-4.2 不需要外部高準確度電(dian)(dian)(dian)阻器來設(she)定浮置電(dian)(dian)(dian)壓(ya)，從(cong)而進一步節(jie)(jie)省了(le)成本(ben)和空(kong)間(jian)。應(ying)用(yong)(yong)包括工(gong)業手持式儀表、12V 至(zhi) 24V 汽(qi)車和重型設(she)備(bei)應(ying)用(yong)(yong)、臺(tai)式插座充電(dian)(dian)(dian)器以及筆記本(ben)或(huo)平板電(dian)(dian)(dian)腦。

　　LT3651-4.2 的可編(bian)程開(kai)關頻(pin)率 (200kHz 至(zhi) 1MHz) 使設計師能平衡解決方案尺寸、功率損耗(hao)和(he)濾波需求。同步工(gong)作(zuo)實現了高(gao)達(da) 90% 的充(chong)電(dian)(dian)(dian)(dian)效率。最終浮(fu)置(zhi)電(dian)(dian)(dian)(dian)壓準(zhun)確(que)度(du)為(wei) ?0.5%，充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)準(zhun)確(que)度(du)為(wei) ?7.5%，以(yi)及 C/10 檢測準(zhun)確(que)度(du)為(wei) ?4%。一(yi)(yi)旦充(chong)電(dian)(dian)(dian)(dian)終止，LT3651-4.2 就(jiu)自動(dong)地進入低電(dian)(dian)(dian)(dian)流(liu)備(bei)用模式，該模式將(jiang)輸(shu)入電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)流(liu)降(jiang)至(zhi) 80uA。停(ting)機時，輸(shu)入偏置(zhi)電(dian)(dian)(dian)(dian)流(liu)降(jiang)至(zhi) 15uA。由于在所(suo)有非(fei)充(chong)電(dian)(dian)(dian)(dian)周期中僅從電(dian)(dian)(dian)(dian)池泄漏 <1uA 的電(dian)(dian)(dian)(dian)流(liu)，所(suo)以(yi) LT3651-4.2 可最大限(xian)度(du)地延(yan)長電(dian)(dian)(dian)(dian)池壽(shou)命。就(jiu)安全性和(he)自主充(chong)電(dian)(dian)(dian)(dian)控(kong)制(zhi)而言，該器(qi)件包括自動(dong)重啟和(he)預處理、一(yi)(yi)個用于溫(wen)度(du)合格充(chong)電(dian)(dian)(dian)(dian)的熱敏電(dian)(dian)(dian)(dian)阻輸(shu)入、可編(bian)程輸(shu)入電(dian)(dian)(dian)(dian)流(liu)限(xian)制(zhi)、壞電(dian)(dian)(dian)(dian)池檢測以(yi)及二進制(zhi)編(bian)碼的狀態輸(shu)出(chu)引腳(jiao)。

　　LT3651-4.2 采用扁平 (0.75mm) 36 引腳 5mm x 6mm QFN 封裝(zhuang)，同時提供 E 級(ji)和I 級(ji)版(ban)本，保證工作(zuo)在 -40?C 至(zhi) 125?C 溫度范圍(wei)。千片(pian)批購價(jia)分(fen)別為每片(pian) 4.13 美元(yuan)和 4.75 美元(yuan)。兩節 8.2V 和 8.4V 版(ban)本以(yi)及(ji)一節 4.1V 版(ban)本計劃在未來 2 至(zhi) 3 個月內(nei)推出。

照片說明： 32V、4A 同步單片式單節鋰離子電池充電器