New Industry Products

National Semi Intros LM2642 Regulator Controller

June 09, 2002 by Jeff Shepard

National Semiconductor (Santa Clara, CA) announced its new LM2642 two-phase, synchronous-switching controller, designed to address the power regulation requirements in next-generation systems, which provides accurate and cost-effective dual-voltage power regulation. The LM2642 controller enables up to 95-percent conversion efficiency for applications such as set-top boxes, home gateways, cable modems and a wide variety of industrial applications, and is suitable for developing either multiple voltages or a single high-current voltage.

The LM2642 features two current-mode, synchronous-buck regulator controllers with a switching frequency of 300kHz, a 4.5V to 30V input-voltage range, current-mode control for high performance over the range, a settable output from 1.3V to 13.5V, current-mode control with or without a current-sense resistor ensuring line and load regulation over a wide input-voltage range, a power-good function combined with independent enable and soft-start pins for easy power sequencing, and a wide-loop bandwidth that results in a fast response to load transients. The two controllers operate 180 degrees out of phase, which reduces the required input capacitance and allows the device to be used as a single-output regulator for high-current applications.

The LM2642 controller, housed in a TSSOP-28 package, is shipping now, and is priced at $2.28 each in 1,000 units.