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(bi)記本(ben)或平板電腦。

    LT3651-4.2的(de)(de)(de)(de)可編(bian)(bian)程開關頻率(200kHz至1MHz)使設(she)計師能平(ping)衡解決方案尺(chi)寸、功(gong)率損耗和濾(lv)波需求。同步工作實(shi)現了高達(da)90%的(de)(de)(de)(de)充電(dian)(dian)(dian)(dian)(dian)效率。最終浮(fu)置電(dian)(dian)(dian)(dian)(dian)壓準(zhun)確(que)度(du)為?0.5%，充電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)準(zhun)確(que)度(du)為?7.5%，以及C/10檢測準(zhun)確(que)度(du)為?4%。一(yi)旦充電(dian)(dian)(dian)(dian)(dian)終止，LT3651-4.2就(jiu)自(zi)動(dong)地(di)進(jin)入低電(dian)(dian)(dian)(dian)(dian)流(liu)備用模(mo)式，該(gai)(gai)模(mo)式將(jiang)輸(shu)入電(dian)(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)(dian)流(liu)降(jiang)至80uA。停機時(shi)，輸(shu)入偏置電(dian)(dian)(dian)(dian)(dian)流(liu)降(jiang)至15uA。由(you)于(yu)在所(suo)有非充電(dian)(dian)(dian)(dian)(dian)周期中僅從電(dian)(dian)(dian)(dian)(dian)池泄漏(lou)<1uA的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)流(liu)，所(suo)以LT3651-4.2可最大(da)限度(du)地(di)延長電(dian)(dian)(dian)(dian)(dian)池壽(shou)命。就(jiu)安全性和自(zi)主充電(dian)(dian)(dian)(dian)(dian)控制(zhi)而言(yan)，該(gai)(gai)器件包括自(zi)動(dong)重啟和預處理、一(yi)個用于(yu)溫度(du)合格充電(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)(de)熱敏電(dian)(dian)(dian)(dian)(dian)阻輸(shu)入、可編(bian)(bian)程輸(shu)入電(dian)(dian)(dian)(dian)(dian)流(liu)限制(zhi)、壞電(dian)(dian)(dian)(dian)(dian)池檢測以及二進(jin)制(zhi)編(bian)(bian)碼的(de)(de)(de)(de)狀(zhuang)態(tai)輸(shu)出引腳。

    LT3651-4.2采用(yong)扁平(0.75mm)36引腳5mmx6mmQFN封裝，同(tong)時(shi)提供E級(ji)和I級(ji)版本(ben)，保證工作在-40?C至125?C溫度范圍。千片(pian)批購(gou)價分別(bie)為每片(pian)4.13美元(yuan)和4.75美元(yuan)。兩(liang)節8.2V和8.4V版本(ben)以及一節4.1V版本(ben)計劃(hua)在未來(lai)2至3個月內(nei)推出。      

 32V、4A同步單片式單節鋰離子電池充電器

  性(xing)能概要(yao)：LT3651-4.2

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

    ?可編程(cheng)充電電流高(gao)達4A

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

    ?同步整流提高充電效率

    ?用戶可(ke)選終止：C/10或可(ke)編程終止定時器(qi)

    ?可編程(cheng)開關頻率(200kHz至1MHz)

    ?可編程輸入電流限制

    ??0.5%充電電壓準確度

    ??7.5%充電電流(liu)準確度(du)

    ??4%C/10檢測準確(que)度

    ?NTC電阻器溫(wen)度監視器

    ?自動再充(chong)電(dian)

    ?自(zi)動預(yu)處(chu)理

    ?二進制編碼集電極開(kai)路充(chong)電狀態引腳

    ?具自動復位(wei)的壞(huai)電池檢(jian)測

    ?扁平(0.75mm)5mmx6mmQFN-36封裝