高效率、4A單片同步降壓型電池充電器LT3651-4.2，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(ji)本或平(ping)板電腦(nao)。

    LT3651-4.2的(de)可編(bian)程開(kai)關頻率(lv)(200kHz至1MHz)使設(she)計(ji)師(shi)能平衡解決方案尺寸、功率(lv)損耗(hao)和濾(lv)波需(xu)求(qiu)。同步(bu)工作實現了高達(da)90%的(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)效率(lv)。最終浮置(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓準(zhun)確度(du)為?0.5%，充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)準(zhun)確度(du)為?7.5%，以及(ji)C/10檢測準(zhun)確度(du)為?4%。一旦(dan)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)終止，LT3651-4.2就自(zi)(zi)動地進入低電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)備用(yong)模(mo)式，該模(mo)式將輸(shu)入電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)降(jiang)至80uA。停機時，輸(shu)入偏置(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)降(jiang)至15uA。由于(yu)在所(suo)有非(fei)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)周期(qi)中僅從電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)泄漏<1uA的(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)，所(suo)以LT3651-4.2可最大限度(du)地延(yan)長電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)壽命。就安全性(xing)和自(zi)(zi)主充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)控制(zhi)(zhi)而言，該器件(jian)包括自(zi)(zi)動重啟和預處理、一個用(yong)于(yu)溫度(du)合格充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)的(de)熱敏電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻輸(shu)入、可編(bian)程輸(shu)入電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)限制(zhi)(zhi)、壞電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)檢測以及(ji)二進制(zhi)(zhi)編(bian)碼的(de)狀態輸(shu)出引腳。

    LT3651-4.2采(cai)用扁平(0.75mm)36引腳5mmx6mmQFN封裝，同時提供E級(ji)和I級(ji)版本，保證工作在-40?C至125?C溫度范圍。千片批(pi)購(gou)價分別為每(mei)片4.13美元(yuan)和4.75美元(yuan)。兩節(jie)8.2V和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。      

 32V、4A同步單片式單節鋰離子電池充電器

  性能概(gai)要：LT3651-4.2

    ?寬輸入電(dian)壓范圍(wei)：4.75V至32V(40V絕對(dui)最大(da)額定值)

    ?可(ke)編程充電(dian)電(dian)流高(gao)達4A

    ?單節鋰離子/聚合物電(dian)池充(chong)電(dian)功能，4.2V充(chong)電(dian)電(dian)壓(ya)

    ?同步整流提高充電效率

    ?用戶可選終止：C/10或可編程終止定時器

    ?可編程開關頻(pin)率(200kHz至1MHz)

    ?可(ke)編程輸入電流限(xian)制

    ??0.5%充電電壓準(zhun)確度

    ??7.5%充電(dian)電(dian)流準確度(du)

    ??4%C/10檢測準(zhun)確(que)度(du)

    ?NTC電阻器溫度監視器

    ?自(zi)動再(zai)充(chong)電(dian)

    ?自動(dong)預處理

    ?二進(jin)制編碼集電(dian)極開路充電(dian)狀態(tai)引腳(jiao)

    ?具(ju)自動復(fu)位的壞電池檢測(ce)

    ?扁平(ping)(0.75mm)5mmx6mmQFN-36封裝