便(bian)攜式電(dian)(dian)(dian)(dian)源應(ying)用(yong)領域寬泛而多(duo)樣。產品(pin)涵蓋了(le)從(cong)平均功耗僅幾(ji) μW 的(de)(de)無(wu)線傳感器(qi)節點到(dao)采用(yong)好幾(ji)百瓦(wa)時電(dian)(dian)(dian)(dian)池(chi)組的(de)(de)車載(zai)式醫療或數據采集系(xi)統等(deng)眾(zhong)多(duo)門(men)類。然而，盡管(guan)品(pin)種繁(fan)多(duo)，但它們卻呈現出了(le)相(xiang)對一致的(de)(de)發展(zhan)趨(qu)勢(shi) ━━ 設計人(ren)員(yuan)不斷(duan)地要(yao)(yao)求其產品(pin)擁有較高(gao)的(de)(de)功率以支持更多(duo)的(de)(de)功能(neng)，并指望能(neng)從(cong)任何(he)可用(yong)的(de)(de)電(dian)(dian)(dian)(dian)源來給電(dian)(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)(dian)。第(di)一個(ge)趨(qu)勢(shi)要(yao)(yao)求增(zeng)加(jia)電(dian)(dian)(dian)(dian)池(chi)容(rong)量。不幸的(de)(de)是，用(yong)戶常(chang)常(chang)缺乏耐(nai)心(xin)，而且增(zeng)加(jia)的(de)(de)電(dian)(dian)(dian)(dian)池(chi)容(rong)量必須要(yao)(yao)在合理的(de)(de)時間之內(nei)完(wan)成充電(dian)(dian)(dian)(dian)，這就必然導致充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流的(de)(de)增(zeng)大。第(di)二個(ge)趨(qu)勢(shi)則要(yao)(yao)求電(dian)(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)(dian)解決方案具(ju)有巨大的(de)(de)靈活性。我們將對這些問題逐個(ge)進行較為詳細的(de)(de)探究。

　　更高的功率

　　新式的手持設備 (無論是消費類設備還是工業設備) 都有可能包括一個蜂窩電話調制解調器、一個WiFi模塊、一個藍牙模塊、一個大型的背面照明顯示器等等。許多手持式設備的電源架構都可通過蜂窩電話反映出來。通常，3.7V 的鋰離子電池因其很高的重量 (Wh/kg) 和體積 (Wh/m3) 能量密度而被用作主電源。過去，不少高功率密度設備都采用一個 7.4V 鋰離子電池以降低電(dian)(dian)(dian)(dian)流需求，但廉(lian)價的(de) 5V 電(dian)(dian)(dian)(dian)源管理(li) IC 的(de)面(mian)市使得(de)越來越多的(de)手持(chi)式設備轉而采用較低電(dian)(dian)(dian)(dian)壓架構(gou)。平(ping)(ping)板電(dian)(dian)(dian)(dian)腦(nao)很好地體現了這一點 ━━ 標準的(de)平(ping)(ping)板電(dian)(dian)(dian)(dian)腦(nao)擁有豐富的(de)功能以及非常(chang)大 (用于便攜式設備) 的(de)屏幕。當(dang)采用一個 3.7V 電(dian)(dian)(dian)(dian)池(chi)來供(gong)電(dian)(dian)(dian)(dian)時，電(dian)(dian)(dian)(dian)池(chi)的(de)容量必須(xu)達到幾千mAh。為了能夠(gou)在幾個小時之內(nei)完(wan)成此類電(dian)(dian)(dian)(dian)池(chi)的(de)充(chong)電(dian)(dian)(dian)(dian)，需要(yao)幾千mA的(de)充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流。

　　然而，消費者(zhe)同(tong)樣希(xi)望能夠在沒有可用的大(da)電(dian)(dian)流墻上適(shi)配器(qi)時(shi)從(cong)一(yi)(yi)個(ge) USB 端口來為其高(gao)(gao)功率設備(bei)充電(dian)(dian)，這種愿望并(bing)未(wei)因為上述的高(gao)(gao)充電(dian)(dian)電(dian)(dian)流而被遏制。為了滿(man)足(zu)這些要求，在可以使用墻上適(shi)配器(qi)時(shi)，電(dian)(dian)池充電(dian)(dian)器(qi)必須要能夠以高(gao)(gao)電(dian)(dian)流 (>2A) 進行(xing)充電(dian)(dian)，但仍然可以高(gao)(gao)效地(di)利(li)用 USB 端口所提供的 2.5W 至 4.5W 功率。此(ci)外，產品還(huan)必需(xu)避(bi)免(mian)敏感(gan)的下游(you)低(di)電(dian)(dian)壓組(zu)件(jian)遭(zao)受有可能造成(cheng)損(sun)壞的過壓，將(jiang)高(gao)(gao)電(dian)(dian)流從(cong)一(yi)(yi)個(ge) USB 輸入(ru)、一(yi)(yi)個(ge)墻上適(shi)配器(qi)或電(dian)(dian)池無縫地(di)引導至負載，并(bing)最大(da)限度地(di)降低(di)功率損(sun)耗。與此(ci)同(tong)時(shi)，IC 必須安全地(di)管理(li)電(dian)(dian)池充電(dian)(dian)算法并(bing)監視關鍵的系統參數。

　　解決單節電(dian)池(chi)供電(dian)型便攜式產品的電(dian)源(yuan)難題

　　盡管(guan)(guan)(guan)似乎(hu)無法找(zhao)到單(dan)個 IC 來滿足(zu)上(shang)(shang)述要求，但(dan)不妨考慮(lv)一下 LTC4155，這(zhe)是一款高功率(lv)、I2C 控制、高效率(lv) PowerPathTM管(guan)(guan)(guan)理(li)(li)器(qi)(qi)、理(li)(li)想二(er)極管(guan)(guan)(guan)控制器(qi)(qi)和(he)(he)鋰(li)離(li)子電(dian)池充電(dian)器(qi)(qi)。該器(qi)(qi)件(jian)設(she)計(ji)用于(yu)從多種 5V 電(dian)源高效地輸(shu)送(song)高達 3A 的電(dian)流(liu)(liu)，可為電(dian)池充電(dian)及系統(tong)用途提供(gong)(gong) 3.5A 以(yi)上(shang)(shang)的電(dian)流(liu)(liu)。即使在這(zhe)些高電(dian)流(liu)(liu)水平下，LTC4155 的 88% ~ 94% 效率(lv)仍然可使熱預算限制條件(jian)有(you)所放(fang)寬(kuan)。LTC4155 的開關 PowerPath 拓(tuo)撲結構可對(dui)從兩(liang)個輸(shu)入電(dian)源 (比(bi)如(ru)：墻上(shang)(shang)適配器(qi)(qi)和(he)(he) USB 端口) 至(zhi)設(she)備(bei)的可再充電(dian)鋰(li)離(li)子電(dian)池的功率(lv)輸(shu)送(song)進行(xing)無縫管(guan)(guan)(guan)理(li)(li)，并在輸(shu)入功率(lv)有(you)限時優先向系統(tong)負載供(gong)(gong)電(dian)。

　　LTC4155 的開關穩壓器起一個變壓器的作用，允許 VOUT 上的負載電流超過輸入電源所吸收的電流，與常用的線性模式充電器相比，大幅度地改善了電池充電可用功率的使用效率。如前面的例子所示，LTC4155 能夠以高達 3.5A 的電流進行高效充電，從而縮短充電時間。與普通的開關電池充電器不同，LTC4155 具(ju)有“即時接(jie)通”操作(zuo)能力(li)，以確保在(zai)插入電源時可立(li)即獲得系統功率，即使所(suo)采用的(de)是一個失效的(de)電池(chi)或深度(du)放電的(de)電池(chi)也不例(li)外。

　　在對電池(chi)進行高速充電時(shi)(shi)，監視電池(chi)的(de)(de)安全性是很重要的(de)(de)。LTC4155 將在電池(chi)溫度下(xia)降至 0℃ 以下(xia)或(huo)上(shang)升至 40℃ 以上(shang) (由一(yi)個(ge)外部負(fu)溫度系數 [NTC] 熱敏電阻負(fu)責測量) 時(shi)(shi)自(zi)動停止充電。除了這種(zhong)自(zi)主特性之(zhi)外，LTC4155 還(huan)提供了一(yi)個(ge) 7 位(wei)擴展標度模數轉換(huan)器 (ADC)，用于以大約 1℃ 的(de)(de)分辨率來(lai)監視電池(chi)的(de)(de)溫度。結(jie)合 4 種(zhong)可用的(de)(de)浮置電壓設(she)定值和 15 種(zhong)電池(chi)充電電流設(she)定值，該 ADC 能夠用于建(jian)立基(ji)于電池(chi)溫度的(de)(de)定制充電算法。

　　通過一個簡單的二線式 I2C 端口可獲得 NTC ADC 結果，從而據此調整充電電流和電壓設定值。該I2C 端口還通過控制 16 種輸入電流限制設定值 (包括可兼容 USB 2.0 和 3.0 規格的設定值) 提供了與 USB 規范的兼容性。通信總線允許 LTC4155提供額外的狀態指示信息，例如：輸入電源狀態、充電器狀(zhuang)(zhuang)態和故障狀(zhuang)(zhuang)態。USB OTG (On-The-Go) 支持(chi)能力(li)可在未采用(yong)任何附加組件的情況下提供(gong)一個返(fan)回 USB 端口的 5V 電源。

　　LTC4155 的(de)(de)(de)雙輸入(ru)、優先(xian)級(ji)多(duo)路(lu)復(fu)用器(qi)可根據用戶定義(yi)的(de)(de)(de)優先(xian)級(ji) (適配器(qi)輸入(ru)是默認的(de)(de)(de)優先(xian)選(xuan)擇(ze)) 自主選(xuan)擇(ze)最合適的(de)(de)(de)輸入(ru) (墻上適配器(qi)或 USB)。過壓(ya)保護 (OVP) 電(dian)路(lu)用于同時保護兩(liang)個輸入(ru)免遭因意(yi)外(wai)施(shi)加高電(dian)壓(ya)或反向(xiang)(xiang)電(dian)壓(ya)而造(zao)成的(de)(de)(de)損壞。LTC4155 的(de)(de)(de)理想二極管控制器(qi)可確保始終能(neng)夠向(xiang)(xiang) VOUT 提供足夠的(de)(de)(de)功率(lv)，即(ji)使輸入(ru)功率(lv)不(bu)足或缺失也不(bu)例外(wai)。

　　對于(yu)諸如(ru)平板電(dian)腦或工業條形碼掃(sao)描儀等許多便攜(xie)式(shi)應用(yong)而言(yan)，管理兩個輸(shu)入 (例如(ru)：USB和墻(qiang)上(shang)適配器) 就(jiu)足夠了。不(bu)過，便攜(xie)式(shi)設備的設計人員仍在(zai)繼(ji)續探尋能(neng)夠從(cong)任何可用(yong)電(dian)源來給電(dian)池充電(dian)的方(fang)法。

　　多種輸入電源

　　諸多(duo)(duo)原因導(dao)致用(yong)(yong)戶(hu)希(xi)望(wang)從(cong)多(duo)(duo)種輸(shu)入(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)來給電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)。某些(xie)應(ying)用(yong)(yong)有(you)可能需(xu)要(yao)脫(tuo)離電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)網并指(zhi)望(wang)由太陽(yang)能板來供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)。其(qi)他的(de)(de)(de)(de)(de)(de)應(ying)用(yong)(yong)則希(xi)望(wang)擁有(you)能夠從(cong)墻(qiang)上適配器、汽(qi)車(che)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)或(huo)者(zhe)高電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)工業(ye)或(huo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)信(xin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)進行充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)(de)(de)(de)便利(li)。不管(guan)是什么原因，這種要(yao)求都給電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)系(xi)統(tong)施(shi)加了(le)一(yi)個(ge)沉重(zhong)的(de)(de)(de)(de)(de)(de)負擔。大多(duo)(duo)數電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器均利(li)用(yong)(yong)一(yi)種降(jiang)壓(ya)(ya)(ya) (開關或(huo)線性) 架構從(cong)一(yi)個(ge)高于(yu)最大電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)來給電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)。早(zao)先(xian)的(de)(de)(de)(de)(de)(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器產品通常被限(xian)制于(yu)大約 30V 的(de)(de)(de)(de)(de)(de)輸(shu)入(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)。此類(lei)局限(xian)性導(dao)致設(she)計(ji)(ji)人員無法考慮將電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)信(xin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)作為(wei)可行的(de)(de)(de)(de)(de)(de)輸(shu)入(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)，或(huo)者(zhe)采用(yong)(yong)具有(you) 42V 開路電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)的(de)(de)(de)(de)(de)(de)太陽(yang)能板。在(zai)某些(xie)場合中，期(qi)望(wang)輸(shu)入(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)范圍既會升至電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)以上也會降(jiang)至電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)以下(xia)。設(she)計(ji)(ji)旨在(zai)應(ying)對上述(shu)難題的(de)(de)(de)(de)(de)(de)解(jie)決方(fang)案通常需(xu)要(yao)整合高精度的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流檢測(ce)放大器、ADC、用(yong)(yong)于(yu)控制充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)操作的(de)(de)(de)(de)(de)(de)微處理器、高性能的(de)(de)(de)(de)(de)(de) DC/DC 轉換器以及理想二極管(guan)或(huo)多(duo)(duo)路復(fu)用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路。凌力爾特(te)公司推出了(le)一(yi)款更加優越的(de)(de)(de)(de)(de)(de)解(jie)決方(fang)案。

　　功能強大且擁有(you)無可比擬(ni)之(zhi)靈活性的(de)充電解決方案(an)

　　LTC4000 可將任何在外部補償的 DC/DC 電源轉換為一個全功能的電池充電器，并具(ju)有(you) PowerPathTM 控制功能(neng)。LTC4000 能(neng)夠驅動的(de)(de)常用DC/DC 轉換(huan)器(qi)拓撲結構包括(kuo) (但(dan)不限于) 降(jiang)壓、升壓、降(jiang)壓-升壓、SEPIC 和(he)反激(ji)式(shi)。該器(qi)件提供了(le)精(jing)準的(de)(de)輸(shu)入電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)和(he)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)調(diao)節，并可在(zai)一個(ge) 3V 至(zhi) 60V 的(de)(de)寬輸(shu)入和(he)輸(shu)出電(dian)(dian)(dian)(dian)(dian)(dian)壓范圍內運作，因而與多種不同(tong)的(de)(de)輸(shu)入電(dian)(dian)(dian)(dian)(dian)(dian)壓電(dian)(dian)(dian)(dian)(dian)(dian)源、電(dian)(dian)(dian)(dian)(dian)(dian)池組尺寸和(he)化學組成(cheng)相兼容。由于這(zhe)款器(qi)件采用了(le)通(tong)用型配置(zhi)，因此其典型應用范圍十分(fen)廣泛，包括(kuo)高(gao)功率電(dian)(dian)(dian)(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)系統、高(gao)性能(neng)便攜式(shi)儀器(qi)、電(dian)(dian)(dian)(dian)(dian)(dian)池后備系統、配備電(dian)(dian)(dian)(dian)(dian)(dian)池的(de)(de)工業設備以(yi)及筆(bi)記本電(dian)(dian)(dian)(dian)(dian)(dian)腦 / 小型筆(bi)記本電(dian)(dian)(dian)(dian)(dian)(dian)腦等。

　　除了可支持多種(zhong)不(bu)同的(de) DC/DC 拓(tuo)撲結(jie)構之外(wai)，LTC4000 的(de)高(gao)電(dian)(dian)(dian)壓能(neng)(neng)力還使其(qi)能(neng)(neng)夠(gou)(gou)利用(yong)幾(ji)乎任(ren)何輸(shu)(shu)入電(dian)(dian)(dian)源(yuan)來形成功能(neng)(neng)強大的(de)電(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)解決方案。為了確保來自這(zhe)些輸(shu)(shu)入的(de)功率能(neng)(neng)輸(shu)(shu)送(song)至合適的(de)負(fu)載，LTC4000采(cai)(cai)用(yong)了一(yi)種(zhong)智能(neng)(neng) PowerPathTM 拓(tuo)撲結(jie)構，當輸(shu)(shu)入功率有限時，該(gai)拓(tuo)撲結(jie)構將優先向系統負(fu)載供電(dian)(dian)(dian)。LTC4000 通(tong)過控制外(wai)部(bu) PFET 來提供低損耗反(fan)向電(dian)(dian)(dian)流(liu)保護、電(dian)(dian)(dian)池的(de)低損耗充(chong)電(dian)(dian)(dian)和放(fang)電(dian)(dian)(dian)以及(ji)“即(ji)(ji)時接通(tong)型”操作，以確保在插(cha)入電(dian)(dian)(dian)源(yuan)時可立即(ji)(ji)獲得(de)系統功率，即(ji)(ji)使所采(cai)(cai)用(yong)的(de)是一(yi)個失效的(de)電(dian)(dian)(dian)池或深度放(fang)電(dian)(dian)(dian)的(de)電(dian)(dian)(dian)池也不(bu)例外(wai)。外(wai)部(bu)檢(jian)測電(dian)(dian)(dian)阻器可提供輸(shu)(shu)入電(dian)(dian)(dian)流(liu)和電(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流(liu)信息，從而(er)使得(de) LTC4000 能(neng)(neng)夠(gou)(gou)與功率范圍(wei)從幾(ji)毫瓦到幾(ji)千瓦的(de)轉換器一(yi)起(qi)使用(yong)。

　　LTC4000 的全(quan)功能電(dian)(dian)池(chi)(chi)充電(dian)(dian)控制器可對多種電(dian)(dian)池(chi)(chi)化(hua)學組成進行充電(dian)(dian)，包括鋰離(li)子電(dian)(dian)池(chi)(chi) / 鋰聚(ju)合物電(dian)(dian)池(chi)(chi) / 磷酸鐵鋰電(dian)(dian)池(chi)(chi)、密封鉛酸電(dian)(dian)池(chi)(chi) (SLA) 和(he)鎳電(dian)(dian)池(chi)(chi)等。另外(wai)，電(dian)(dian)池(chi)(chi)充電(dian)(dian)器還具有高精度的電(dian)(dian)流檢(jian)測功能，可為高電(dian)(dian)流應用提供較低的檢(jian)測電(dian)(dian)壓。

　　新(xin)式便(bian)(bian)攜產品的(de)設(she)計(ji)師從(cong)(cong)事著極富(fu)挑戰性(xing)(xing)(xing)的(de)工(gong)作 ━━ 特(te)別當其面(mian)對電(dian)源(yuan)(yuan)時。客戶不斷地追逐需要消耗更(geng)多(duo)功(gong)率的(de)功(gong)能(neng)(neng)(neng)，因而必需使用更(geng)大的(de)電(dian)池。與此同(tong)時，客戶還希望(wang)擁有從(cong)(cong)幾乎所有的(de)可用電(dian)源(yuan)(yuan)來給這(zhe)些電(dian)池充(chong)電(dian)的(de)便(bian)(bian)利(li)(li)。雖然便(bian)(bian)攜式電(dian)源(yuan)(yuan)的(de)上述(shu)發展趨勢(shi)帶(dai)來了設(she)計(ji)難(nan)題，但(dan) LTC4155 和 LTC4000 則使設(she)計(ji)工(gong)作大為(wei)簡化。在低電(dian)壓系統中，LTC4155 可高(gao)效提供高(gao)達 3.5A 的(de)充(chong)電(dian)電(dian)流，并具有諸多(duo)高(gao)性(xing)(xing)(xing)能(neng)(neng)(neng)特(te)性(xing)(xing)(xing)。LTC4000 能(neng)(neng)(neng)夠利(li)(li)用幾乎任何輸入來實(shi)現一款(kuan)功(gong)能(neng)(neng)(neng)強大的(de)充(chong)電(dian)解決(jue)方(fang)案，且擁有無與倫比的(de)性(xing)(xing)(xing)能(neng)(neng)(neng)及靈(ling)活性(xing)(xing)(xing)。