The Micrel MIC2174/MIC2174C is a fixed frequency, synchronous buck controller featuring adaptive on-time control. The MIC2174/MIC2174C operates over an input supply range of 3V to 40V at a fixed switching 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 ultra fast transient response while reducing the output capacitance and also extremely low duty-cycle operation possible. The MIC2174/MIC2174C utilizes an adaptive T ON 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/MIC2174C is available in a 10-pin MSOP (MAX1954A-compatible) package with an operating junction temperature range from -40 °C to +125 °C.

All support documentation can be found on Micrel’s web site at: www.micrel.com.