過壓保護功能的電池充電器
全球領先的單片機和模擬半導體供應商――Microchip Technology Inc.（美國微芯科技公司）日前宣布，推出兩個具有過壓保護（OVP）功能的充電管理控制器系列，可防止輸入電壓尖峰造成電池充電器電路的過熱和損壞。MCP73113、MCP73114和MCP73213鋰離子（Li-Ion）電池及MCP73123和MCP73223磷酸鐵鋰電池充電器具備高精度電壓調節功能和(he)集成的傳(chuan)輸(shu)晶體管(guan)。這(zhe)些特(te)點的結合使便攜式電子(zi)設備設計的體積更(geng)(geng)小(xiao)、更(geng)(geng)安(an)全，而且運(yun)行時間更(geng)(geng)長(chang)，適用于(yu)消費類、醫療和(he)工(gong)業市場。
Microchip新(xin)款充電(dian)(dian)(dian)(dian)(dian)器(qi)解決了(le)消費(fei)者日益重視的電(dian)(dian)(dian)(dian)(dian)池(chi)供電(dian)(dian)(dian)(dian)(dian)應用的安全性和(he)效率問題(ti)。所有這些新(xin)器(qi)件(jian)的最大輸入電(dian)(dian)(dian)(dian)(dian)壓為(wei)(wei)18V；而且有兩(liang)種OVP設置點――單節電(dian)(dian)(dian)(dian)(dian)池(chi)MCP73114和(he)MCP73113/23充電(dian)(dian)(dian)(dian)(dian)器(qi)為(wei)(wei)5.8V和(he)6.5V，雙節MCP73213和(he)MCP73123充電(dian)(dian)(dian)(dian)(dian)器(qi)為(wei)(wei)13V。此(ci)外，MCP73113、MCP73114和(he)MCP73213器(qi)件(jian)可為(wei)(wei)鋰離(li)子電(dian)(dian)(dian)(dian)(dian)池(chi)提供各種充電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)壓選(xuan)(xuan)擇――單節為(wei)(wei)4.1至4.4V，雙節為(wei)(wei)8.2至8.8V。MCP73123和(he)MCP73223器(qi)件(jian)適用于LiFePO4電(dian)(dian)(dian)(dian)(dian)池(chi)，并分別(bie)提供3.6V和(he)7.2V的充電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)壓選(xuan)(xuan)擇。
Microchip模擬和(he)接口產品(pin)部(bu)市場(chang)(chang)營銷副(fu)總裁Bryan Liddiard表示(shi)：“MCP731XX和(he)MCP732XX電(dian)池充電(dian)器(qi)滿足了客戶(hu)對簡單(dan)、高效的(de)(de)充電(dian)解(jie)決方(fang)案(an)的(de)(de)需(xu)求，同時以過壓保(bao)護的(de)(de)形式增加(jia)一個額外的(de)(de)安(an)全措施(shi)。通過為日漸(jian)重要的(de)(de)LiFePO4電(dian)池提供(gong)不同的(de)(de)充電(dian)方(fang)案(an)，Microchip也滿足了不斷(duan)發(fa)展(zhan)的(de)(de)電(dian)池市場(chang)(chang)。”
MCP73113和MCP73114單節鋰離子電池充電器與MCP73123單節LiFePO4電(dian)(dian)池(chi)充(chong)電(dian)(dian)器(qi)的電(dian)(dian)壓(ya)調節精度高達0.5％；雙節MCP73213鋰離子和MCP73223 LiFePO4器(qi)件(jian)的電(dian)(dian)壓(ya)調節精度為0.6％。這些高精度的電(dian)(dian)壓(ya)調節可(ke)延長每次(ci)充(chong)電(dian)(dian)后電(dian)(dian)池(chi)的使用壽命，最終延長便攜式(shi)產品(pin)兩次(ci)充(chong)電(dian)(dian)之間(jian)的運行時間(jian)。此外，所有充(chong)電(dian)(dian)器(qi)都采用了(le)集成的傳輸晶體管，無需(xu)增加外部FET，并降(jiang)低了(le)整體設計成本、尺寸和復雜(za)性。
由于(yu)其獨特的功能和化學組合，這些新型(xing)充電(dian)器是消費類（如(ru)GPS裝置、便(bian)攜(xie)式媒體播放(fang)器、手(shou)機充電(dian)器、玩具、照相機和攝像機及藍牙耳(er)機）、醫療（如(ru)便(bian)攜(xie)式血(xue)糖儀及血(xue)壓和心率(lv)監測儀）和工業市場（如(ru)銷售(shou)點終(zhong)端、手(shou)持(chi)式條(tiao)碼掃描器和其他(ta)便(bian)攜(xie)設(she)備）的理想(xiang)選擇。
開發工具支持
Microchip還推出了兩款支持新型充電器的評估板。MCP73113 OVP單節鋰離子電池充電器評(ping)估(gu)板(ban)(ban)（部件(jian)編(bian)號(hao)MCP73113EV-1SOVP）為用戶(hu)提(ti)供一個測試單節鋰(li)離子電(dian)(dian)池基本功(gong)能的(de)平臺，其充(chong)電(dian)(dian)電(dian)(dian)壓(ya)(ya)(ya)為4.2V，過(guo)(guo)壓(ya)(ya)(ya)保護為6.5V。MCP73213評(ping)估(gu)板(ban)(ban)（部件(jian)編(bian)號(hao)MCP73213EV-2SOVP）有助于用戶(hu)測試雙節鋰(li)離子電(dian)(dian)池的(de)基本功(gong)能，其充(chong)電(dian)(dian)電(dian)(dian)壓(ya)(ya)(ya)為8.4V，過(guo)(guo)壓(ya)(ya)(ya)保護為13V。現可通(tong)過(guo)(guo)//www.microchipDIRECT.com購(gou)買(mai)評(ping)估(gu)板(ban)(ban)。
此外(wai)，Microchip還提供應用(yong)筆記AN1276，《使用(yong)MCP73123設(she)計(ji)低成本(ben)磷酸(suan)鐵鋰（LiFePO4）電池(chi)充(chong)電器》。可通過//www.microchip.com/Battery下載該文檔。
封裝和供貨情況
MCP731XX和MCP732XX充電(dian)器均采用10引腳3 mm x 3 mm DFN封(feng)裝。可(ke)在(zai)//sample.microchip.com訂(ding)購各款充電(dian)器的樣(yang)片，通(tong)過//www.microchipDIRECT.com進行(xing)批量訂(ding)購。欲(yu)了解更詳盡資料(liao)，請(qing)聯(lian)絡Microchip銷售(shou)代表或全球授權(quan)分銷商(shang)，也可(ke)瀏覽Microchip網(wang)站//www.microchip.com/Battery。
Microchip客戶支持
Microchip致力于通過(guo)幫助設計工程(cheng)師更加快捷(jie)、高(gao)效地(di)開(kai)發產品而為客戶(hu)提供有(you)力支持。客戶(hu)可(ke)訪問//www.microchip.com獲得(de)Microchip提供的四類主要服(fu)務：“支持”區(qu)能確保客戶(hu)提出的問題得(de)到快速解(jie)答；“樣片”區(qu)可(ke)提供所有(you)Microchip器件的評估(gu)樣片；microchipDIRECT可(ke)提供24小時的報價(jia)、訂貨(huo)、庫存及信用服(fu)務，讓客戶(hu)更便捷(jie)地(di)采(cai)購所有(you)Microchip器件及開(kai)發工具(ju)；而“培訓”區(qu)則通過(guo)網上研(yan)討(tao)會、報名參加本地(di)研(yan)討(tao)會和動手實驗課程(cheng)，以及每年(nian)在全球各地(di)舉行的Microchip技術(shu)精英年(nian)會的信息(xi)等多種途徑為客戶(hu)提供培訓。