Micrel MIC2174 25A降压电源转换方案

Micrel 公司的MIC2174 是输出电流25A的固定频率同步降压控制器,具有自适应接通时间控制特性,输入电压从3V到40V,开关频率300kHz,输出电压可调至0.8V,效率高达94%,主要用于工业设备,分布式DC电源,汽车,PC和服务器.本文介绍MIC2174主要特性, 方框图, 自适应接通时间控制的同步降压转换器电路图和评估板电路图以及材料清单(BOM).

The Micrel MIC2174 is a fixed frequency, synchronous buck controller featuring adaptive on-time control. The MIC2174 operates over an input supply range of 3V to 40V, switches at a constant frequency of 300kHz and is capable of driving 25A of output current. The output voltage is adjustable down to 0.8V.

A unique Hyper Speed Control™ architecture allows for ultra fast transient response while reducing the output capacitance and also makes High VIN/Low VOUT operation possible. The MIC2174 utilizes a adaptive TON ripple controlled architecture. A UVLO is provided to ensure proper operation under power-sag conditions to prevent the external power MOSFET from overheating. A soft start is provided to reduce inrush current. Foldback current limit and “hiccup” mode short-circuit protection ensure FET and load protection.The MIC2174 is available in a 10-pin MSOP (MAX1954Acompatible) package with a junction operating range from –40℃ to +125℃.

MIC2174主要特性:
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