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本或(huo)平板(ban)電腦。

    LT3651-4.2的(de)可編程開(kai)關(guan)頻率(200kHz至1MHz)使設計師能(neng)平(ping)衡解決方案尺寸、功率損耗和(he)濾波需(xu)求。同步工作(zuo)實現了高達90%的(de)充(chong)電(dian)(dian)(dian)(dian)(dian)效率。最(zui)(zui)終(zhong)(zhong)浮(fu)置電(dian)(dian)(dian)(dian)(dian)壓準確(que)(que)度(du)(du)為?0.5%，充(chong)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)準確(que)(que)度(du)(du)為?7.5%，以(yi)及C/10檢測準確(que)(que)度(du)(du)為?4%。一(yi)旦充(chong)電(dian)(dian)(dian)(dian)(dian)終(zhong)(zhong)止，LT3651-4.2就自(zi)動(dong)地進入低電(dian)(dian)(dian)(dian)(dian)流(liu)備用(yong)模(mo)式，該(gai)模(mo)式將輸(shu)入電(dian)(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)(dian)流(liu)降至80uA。停機時，輸(shu)入偏置電(dian)(dian)(dian)(dian)(dian)流(liu)降至15uA。由于在所有非充(chong)電(dian)(dian)(dian)(dian)(dian)周(zhou)期中僅從電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)泄(xie)漏<1uA的(de)電(dian)(dian)(dian)(dian)(dian)流(liu)，所以(yi)LT3651-4.2可最(zui)(zui)大限度(du)(du)地延長電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)壽命。就安全性和(he)自(zi)主充(chong)電(dian)(dian)(dian)(dian)(dian)控制而言，該(gai)器件包括自(zi)動(dong)重啟(qi)和(he)預處(chu)理、一(yi)個用(yong)于溫(wen)度(du)(du)合(he)格充(chong)電(dian)(dian)(dian)(dian)(dian)的(de)熱(re)敏電(dian)(dian)(dian)(dian)(dian)阻輸(shu)入、可編程輸(shu)入電(dian)(dian)(dian)(dian)(dian)流(liu)限制、壞電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)檢測以(yi)及二進制編碼的(de)狀態輸(shu)出引腳。

    LT3651-4.2采(cai)用扁(bian)平(0.75mm)36引腳5mmx6mmQFN封裝，同時提供E級和I級版本(ben)，保證工作在-40?C至125?C溫度范圍。千(qian)片(pian)批(pi)購價分別為每片(pian)4.13美(mei)元和4.75美(mei)元。兩節8.2V和8.4V版本(ben)以及一節4.1V版本(ben)計(ji)劃(hua)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

    ?寬輸入電壓(ya)范圍：4.75V至32V(40V絕對最大額定值)

    ?可編程充電電流(liu)高(gao)達4A

    ?單節(jie)鋰離子/聚合物電池充電功能，4.2V充電電壓

    ?同步整流提高充電效(xiao)率(lv)

    ?用戶(hu)可(ke)選終止(zhi)：C/10或可(ke)編程(cheng)終止(zhi)定時器(qi)

    ?可編程(cheng)開關頻率(lv)(200kHz至1MHz)

    ?可編程輸入(ru)電(dian)流(liu)限制

    ??0.5%充電電壓準確度(du)

    ??7.5%充電電流準確度

    ??4%C/10檢測(ce)準確度

    ?NTC電阻器溫度監視(shi)器

    ?自動再充電

    ?自動預處(chu)理(li)

    ?二進制編(bian)碼集電(dian)(dian)極開(kai)路充(chong)電(dian)(dian)狀(zhuang)態引腳

    ?具(ju)自動復(fu)位(wei)的(de)壞(huai)電池檢測(ce)

    ?扁平(0.75mm)5mmx6mmQFN-36封裝