Buck controller drives high-current telecom apps

National Semiconductor has launched a synchronous voltage-mode buck controller that drives high-current point-of-load applications in printers, telecom, networking and embedded computing. An addition the Powerwise energy-efficient product range, the LM27402's 20V synchronous buck controller integrates a wide input-voltage range, integrated high-current gate drivers with adaptive dead-time, inductor DCR current sensing and an on-chip bias supply sub-regulator into a single chip.

A voltage range of 3 to 20V allows the LM27402 to interface with all intermediate bus voltages, including 3.3, 5 and 12V rails. Integrated inductor DC resistance current sense eliminates the need for resistive power-train elements to detect output current. This increases overall power conversion efficiency and allows accurate continuous current limit sensing. The current sense threshold level is programmable to accommodate a range of load-current levels using the smallest inductor possible. Output voltage is adjustable down to 0.6V, with a one per cent voltage reference providing output voltage set-point accuracy over the full -40 to 125C 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.

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