4A 單片同步降壓型電池充電器 LT3651-4.2，該器(qi)件面向單(dan)節(jie)(jie)鋰離子/聚合物(wu)電(dian)(dian)(dian)(dian)池應(ying)用(yong)。LT3651-4.2 接受高達 32V 的(de)輸入，并(bing)(bing)具 40V 最(zui)大絕對額定值以增加系統裕度。充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)可編程至高達 4A，而(er)且(qie)是動態可調節(jie)(jie)的(de)，而(er)充分集成(cheng)的(de)同(tong)步電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)路最(zui)大限度地降低了(le)功耗(hao)并(bing)(bing)節(jie)(jie)省了(le)電(dian)(dian)(dian)(dian)路板(ban)空(kong)間。用(yong)戶可選定時器(qi)或 C/10 終止無需(xu)外部微控制(zhi)器(qi)，簡化了(le)設(she)(she)計。LT3651-4.2 不需(xu)要外部高準確度電(dian)(dian)(dian)(dian)阻器(qi)來設(she)(she)定浮置電(dian)(dian)(dian)(dian)壓，從而(er)進一(yi)步節(jie)(jie)省了(le)成(cheng)本(ben)和空(kong)間。應(ying)用(yong)包括工(gong)業(ye)手持式儀表、12V 至 24V 汽車和重型設(she)(she)備應(ying)用(yong)、臺式插座充電(dian)(dian)(dian)(dian)器(qi)以及(ji)筆記本(ben)或平板(ban)電(dian)(dian)(dian)(dian)腦(nao)。

　　LT3651-4.2 的(de)可(ke)編程開關頻(pin)率 (200kHz 至(zhi) 1MHz) 使設計師(shi)能平(ping)衡解決方案(an)尺寸、功率損耗和(he)濾波需(xu)求(qiu)。同步工作(zuo)實現了高達(da) 90% 的(de)充(chong)電(dian)(dian)(dian)(dian)效率。最終(zhong)浮置電(dian)(dian)(dian)(dian)壓(ya)準確(que)度為 ?0.5%，充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流準確(que)度為 ?7.5%，以及 C/10 檢測(ce)準確(que)度為 ?4%。一旦充(chong)電(dian)(dian)(dian)(dian)終(zhong)止，LT3651-4.2 就(jiu)自(zi)動地進入(ru)(ru)低電(dian)(dian)(dian)(dian)流備用模(mo)式，該(gai)模(mo)式將輸(shu)(shu)入(ru)(ru)電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)流降(jiang)至(zhi) 80uA。停機時，輸(shu)(shu)入(ru)(ru)偏置電(dian)(dian)(dian)(dian)流降(jiang)至(zhi) 15uA。由于在(zai)所有非充(chong)電(dian)(dian)(dian)(dian)周(zhou)期中僅從電(dian)(dian)(dian)(dian)池(chi)泄漏(lou) <1uA 的(de)電(dian)(dian)(dian)(dian)流，所以 LT3651-4.2 可(ke)最大限(xian)度地延長電(dian)(dian)(dian)(dian)池(chi)壽命。就(jiu)安全性和(he)自(zi)主充(chong)電(dian)(dian)(dian)(dian)控制而(er)言，該(gai)器件(jian)包(bao)括自(zi)動重(zhong)啟(qi)和(he)預(yu)處理、一個用于溫度合格充(chong)電(dian)(dian)(dian)(dian)的(de)熱敏電(dian)(dian)(dian)(dian)阻輸(shu)(shu)入(ru)(ru)、可(ke)編程輸(shu)(shu)入(ru)(ru)電(dian)(dian)(dian)(dian)流限(xian)制、壞電(dian)(dian)(dian)(dian)池(chi)檢測(ce)以及二(er)進制編碼的(de)狀(zhuang)態輸(shu)(shu)出引腳。

　　LT3651-4.2 采用扁平 (0.75mm) 36 引腳 5mm x 6mm QFN 封裝，同時提供 E 級和(he)I 級版本，保證工(gong)作(zuo)在 -40?C 至 125?C 溫度范圍。千片批(pi)購價分別為每片 4.13 美元和(he) 4.75 美元。兩節(jie) 8.2V 和(he) 8.4V 版本以及一節(jie) 4.1V 版本計(ji)劃在未來 2 至 3 個月內推出。

照片說明： 32V、4A 同步單片式單節鋰離子電池充電器