National Semiconductor announced a synchronous voltage-mode buck controller that drives a variety of high-current point-of-load applications. A input voltage range of 3V to 20V allows the LM27402 to interface with all intermediate bus voltages, including 3.3V, 5.0V and 12V rails. Integrated inductor DC resistance current sense eliminates the need for resistive power train elements to detect output current. The current sense threshold level is programmable to accommodate a wide range of load current levels using the smallest inductor possible.

Output voltage is adjustable down to 0.6V with a one percent voltage reference providing output voltage set-point accuracy over the full -40 degrees C to 125 degrees C operating temperature range. An integrated bias supply sub-regulator eliminates the external bias voltage supply to simplify PC board layout. Integrated, high-current MOSFET gate drivers with adaptive dead-time control enable ultra-efficient power conversion with load currents as high as 30A. It also supports programmable soft-start, tracking and pre-biased startup.

Offered in 16-pin thermally enhanced TSSOP and 4 mm by 4 mm LLP packages, the LM27402 is available for design on National’s Webench Power Designer.