SMC MGPL40-100 ADI公司的ADP2442是一種高效，同步，恒定頻率，電流控制模式降壓型DC / DC穩壓器，該芯片具有出色的負載穩壓特性，負載驅動能力可達到1A。ADP2442具有較寬的輸入電壓范圍（4.5V-36V），可以串聯多個穩壓輸入源，輸出電壓范圍為0.6V-0.9 *Vin。ADP2442具有過流保護，過熱保護，欠壓鎖定等多種內部保護功能。本文通過總結ADP2442器件的特點，介紹器件，特性，應用方向及內部結構布局，并給參考設計實例原理圖，制板圖及元器件清單。ADP2442是一款恒定頻率，電流模式控制，同步，步進式，降壓型DC-DC穩壓器，能夠以出色的線路和負載調節特性驅動高達1 A的負載。ADP2442在4.5 V至36 V的寬輸入電壓范圍內工作，非常適合調節各種電源的功率。此外，ADP2442的最小導通時間非常短（50 ns），因此適合于要求非常高的降壓比的應用。
輸出電壓可在0.6 V至0.9×VIN范圍內調節。集成的低電阻N溝道MOSFET在高端和低端器件中均能實現高效率。
使用外部電阻器，開關頻率可在300 kHz至1 MHz范圍內調節。ADP2442還具有準確的電源良好（PGOOD）漏極開路輸出信號。
ADP2442提供了外部時鐘同步的靈活性。開關頻率可以與施加到SYNC / MODE引腳的外部時鐘同步。ADP2442還可配置為在強制固定頻率模式下工作以實現低EMI或省電模式，以減少輕負載時的開關損耗。
ADP2442采用打ic模式，以保護IC免受短路或輸出過流情況的影響。內部軟啟動限制了啟動期間各種負載電容的浪涌電流。其他關鍵功能包括輸入欠壓鎖定（UVLO），熱關斷（TSD）和精確使能（EN），它們也可用作邏輯電平關斷輸入。
ADP2442采用3 mm×3 mm，12引腳LFCSP封裝，額定結溫范圍為?40℃至+ 125℃。
ADP2442主要特性：
寬輸入電壓范圍從4.5 V至36 V
較低的上50ns的典型時間
馬克西姆微米的負載電流1個
起來的高效率94％
可調輸出下降至0.6V
±1％的輸出電壓精度
在300 kHz至1 MHz范圍內可調節的開關頻率在300 kHz至1 MHz范圍內可進行
外部同步
脈沖跳躍模式或強制固定頻率模式
精密使能輸入引腳（EN）
開漏電源良好
內部軟啟動
過流限制保護
關斷電流小于
15μAUVLO，熱關斷
12引線，3 mm×3 mm LFCSP封裝，
由ADIsimPower?工具集支持
ADP2442應用：
負載點應用
分布式電源系統
工業控制電源
標準電源軌轉換為24 V / 12 V / 5伏/3.3伏
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