Product category: Power Supply ICs and Controllers
News Release from: National Semiconductor | Subject: LM2830, LM2831 and LM2832
Edited by the Electronicstalk Editorial Team on 10 August 2006
PWM convertors create high-density
systems
Monolithic pulsewidth modulation convertors offer industry-leading power density due to their high level of integration, high-frequency operation and ultrasmall packaging.
National Semiconductor has 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 pulsewidth modulation (PWM) convertors offer industry-leading power density due to their high level of integration, high-frequency operation and ultrasmall packaging
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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The LM2831, in a tiny SOT23-5, offers industry-leading power density by providing a 1.5A output current while operating at 1.6 or 3MHz.
It is also available in a 6-lead LLP package.
The 2A LM2832, in a 6-lead LLP package, also offers industry-leading power density and is available at 550kHz, 1.6MHz and 3MHz switching frequencies.
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The 1A LM2830 is available with 1.6 and 3MHz switching frequency options in SOT23-5 and 6-lead LLP packages.
This range of output currents, switching frequencies and packaging options gives designers flexibility in choosing a regulator for conversion from a 3.3 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.
National's LM2830, LM2831 and LM2832 regulators are monolithic, high-frequency, PWM step-down DC/DC convertors.
They provide all the active functions necessary for local DC/DC conversion, with fast transient load response and accurate regulation in the smallest possible board area.
All three regulators have few external components, making them easy to design with, 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 15ns.
The regulators' switching frequencies are set internally at 550kHz, 1.6MHz or 3MHz, which allows designers to use extremely small surface mount inductors and chip capacitors while achieving efficiencies above 90%, even with the highest frequency option.
External shutdown is included, with an ultralow standby current of 30nA.
The regulators also use 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 inrush current, pulse-by-pulse current limit, thermal shutdown and output overvoltage protection.
Prices for these regulators start at $1.25 in 1000-unit quantities for the LM2830 at a 1.6MHz switching frequency.
The 1.6 and 3MHz switching frequencies are available now, and the 550kHz option will be available later this summer, as will the MSOP-8 version of the LM2832.
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