AL3157低噪音電荷泵DC轉(zhuǎn)換應(yīng)用電路
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AL3157是低噪音恒定頻率電荷泵DC/DC轉(zhuǎn)換器,采用雙模式負(fù)載開關(guān)(1x)和雙(2x)轉(zhuǎn)換,用來驅(qū)動(dòng)白光LED. AL3157能以30mA驅(qū)動(dòng)3路LED,另一路以210mA驅(qū)動(dòng)LED閃光或LED閃光燈,輸入電壓2.7V-5.5V,關(guān)斷電流小于1uA,主要用在智能火炬電話LED背光,PDA白光LED背光和背光+火炬照明.
AL3157應(yīng)用:
• Smart Touch Phone LED Backlighting
• PDA White LED backlighting
• Backlighting + Torch light

圖1.AL3157功能方框圖

圖2.AL3157典型應(yīng)用電路圖