易于使用和纖巧的并聯電池充電器系統
凌力爾特公司推出面向鋰離子/聚合物電池、易于使用和纖巧的并聯電池充電器系統 IC LTC4070。該器件以其 450nA 的工作電流,用以前不能使用的非常低電流、斷續或連續充電電源,對電池進行充電和保護。增加一個外部 PMOS 并聯器件后,LTC4070 的充電電流可以從 50mA 提高到 500mA。一個內部電池熱量查驗器降低浮置電壓,以在電池溫度升高時保護鋰離子/聚合物電池。通過串聯配置幾個 LTC4070,可以平衡并給多節電池充電。LTC4070 采用扁平 (0.75mm) 8 引線 2mm x 3mm DFN 封裝,僅用需要與輸入電壓串聯的單個外部電阻器,就可以提供一個完整和超緊湊的充電器解決方(fang)案。該器(qi)件的功能非常適用(yong)于連(lian)續和斷續、低功率(lv)充電電源應用(yong),其中包括(kuo)鋰(li)離子/聚合物電池(chi)備份(fen)、薄膜電池(chi)、幣形電池(chi)、存儲(chu)器(qi)備份(fen)、具有備份(fen)的太陽能供電系(xi)統、嵌入(ru)式汽(qi)車系(xi)統以(yi)及(ji)能源提取/收(shou)集系(xi)統。
LTC4070 具有引腳可選(xuan)的 4.0V、4.1V 或 4.2V 設(she)置,其 1% 準確(que)度的電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)浮置電(dian)(dian)(dian)(dian)(dian)壓(ya)允許(xu)用戶優化電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)容(rong)量和壽命之間的平(ping)衡。獨立的低(di)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)電(dian)(dian)(dian)(dian)(dian)量和高電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)電(dian)(dian)(dian)(dian)(dian)量監察狀態輸出表明電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)已(yi)放電(dian)(dian)(dian)(dian)(dian)或充分充電(dian)(dian)(dian)(dian)(dian)。加上一個與(yu)負(fu)載串聯(lian)的外部 PFET,該(gai)低(di)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)電(dian)(dian)(dian)(dian)(dian)量狀態輸出實(shi)現(xian)了鎖斷(duan)功(gong)能,該(gai)功(gong)能自動使系統負(fu)載與(yu)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)斷(duan)接,以保護電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)免于深度放電(dian)(dian)(dian)(dian)(dian)。
除了緊湊的 2mm x 3mm 8 引線 DFN 封(feng)(feng)裝,LTC4070 還采用 8 引線 MSOP 封(feng)(feng)裝。這些器件的額定工(gong)作(zuo)溫度范(fan)圍為(wei)(wei)(wei) -40°C 至 125°C。以 1,000 片(pian)為(wei)(wei)(wei)單位批量購(gou)買,兩種封(feng)(feng)裝的 E 級和(he)(he) I 級器件每(mei)片(pian)價(jia)格分別為(wei)(wei)(wei) 2.06 美元和(he)(he) 2.31 美元。
照片說明: 并聯電池充電器系統
性能(neng)概要(yao):LTC4070
* 低工作電流:450nA
* 在整(zheng)個(ge)溫度和并聯電流范(fan)圍(wei)內具有 1% 的浮置電壓準(zhun)確度
* 50mA 最大內(nei)部(bu)并聯電流 (有(you)外部(bu) PFET 時為(wei) 500mA)
* 引腳可選(xuan)(xuan)的(de)浮置電壓選(xuan)(xuan)項:4.0V、4.1V、4.2V
* 超低功率 NTC 浮置電(dian)壓查驗實現(xian)鋰離子/聚合(he)物(wu)電(dian)池保護(hu)
* 適用于(yu)斷(duan)續、連續和非(fei)常低功率的充電電源
* 低(di)和高電池電量狀態輸出
* 簡單的低壓負載斷接應用
* 耐熱(re)增(zeng)強型、扁平 8 引(yin)線 DFN (2mm x 3mm x 0.75mm) 和 MSOP 封裝