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Updated: July 8th, 2008 05:26 PM CDT

National Semiconductor Introduces New Family of Buck Regulators With the Industry's Highest Power Density in Ultra-Small Packaging

via PRNewswire

SANTA CLARA, Calif., Aug. 7 /PRNewswire-FirstCall/ -- National Semiconductor Corporation (NYSE: NSM) today expanded its high power-density regulator offerings with the introduction of the LM2830, LM2831 and LM2832. The first products in this new family of monolithic pulse-width modulation(PWM) converters offer industry-leading power density due to their high levelof integration, high-frequency operation and ultra-small packaging.

The LM2831, in a tiny SOT23-5, offers industry-leading power density by providing a 1.5A output current while operating at 1.6 MHz or 3 MHz. It is also available in a 6-lead LLP(R) package. The 2A LM2832, in a 6-lead LLP package, also offers industry-leading power density and is available at 550KHz, 1.6 MHz and 3 MHz switching frequencies. It is also available in an 8-pin MSOP. The 1A LM2830 is available with 1.6 MHz and 3 MHz switching frequency options in SOT23-5 and 6-lead LLP packages.

This range of output currents, switching frequencies and packaging optionsgives designers flexibility in choosing a regulator for conversion from a 3.3V to 5V bus to output voltages as low as 0.6V. This is ideal for point-of-load power requirements in set-top boxes, xDSL cable modems, broadband communications, network cards, computing peripherals and hard disk drives.

Compelling Features and Benefits

National's LM2830, LM2831 and LM2832 regulators are monolithic,high-frequency, PWM step-down DC/DC converters. They provide all the activefunctions necessary for local DC/DC conversion, with fast transient loadresponse and accurate regulation in the smallest possible board area. All three regulators have few external components, making them easy to designwith, especially for designers with limited power management expertise. The products' high-frequency operation is made possible by their innovative control circuitry, which enables on-times as low as 15 ns.

The regulators' switching frequencies are set internally at 550 kHz, 1.6MHz or 3 MHz, which allows designers to use extremely small surface mount inductors and chip capacitors while achieving efficiencies above 90 percent,even with the highest frequency option. External shutdown is included, with an ultra-low stand-by current of 30 nA. The regulators also utilize current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce in-rush current,pulse-by-pulse current limit, thermal shutdown and output over-voltage protection.

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