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ULDO voltage regulators tailored for high-reliability apps

Posted: 12 Dec 2005 ?? ?Print Version ?Bookmark and Share

Keywords:uldo? voltage regulator? international rectifier? RAD-Hard ULDOs?

International Rectifier (IR) introduced a new line of radiation-hardened (RAD-Hard), 3A, fixed- or adjustable-output, ultra-low dropout (ULDO) voltage regulators for high-reliability applications such as satellites and space exploration vehicles where radiation survivability and power consumption are critical parameters. According to the press release, compared to other solutions on the market, dropout voltage has been reduced from 1V to 0.4V, resulting in a 60 percent decrease in power consumption.

The RAD-Hard ULDOs are characterized to single event effect, with a linear energy transfer of 84MeV/(mg/cm2), as well as total ionizing dose of up to 1Mrad (Si) and enhanced low dose rate sensitivity of up to 500krad (Si) in accordance with MIL-STD-883, Method 1019.6, test condition D. These parts are designed for satellites operating from near earth orbit to deep space and are available in either space level or unscreened versions, IR said.

The regulators feature low noise and fast transient response and are designed for space-level point-of-load and post-DC/DC power conversion for FPGAs and DSP controllers. According to the company, the new ULDOs maintain performance throughout their current range and have as much as three times more radiation hardness than other devices on the market.

"IR's new hybrid linear voltage regulators feature low power consumption increasing overall system-level efficiency," said Rick Furtney, VP of IR's HiRel Sector Business Unit. "These ULDOs are ready and proven solutions that reduce parts count, simplify layout and save time for circuit designers."

Two groups of ULDOs are available: the 3.3V input devices are available with 2.5V or 1.8V fixed or adjustable output, while the 5V input devices have adjustable or fixed 2.5V or 3.3V output. The ULDO regulators are offered in two hermetic package styles: MO-078AA, high-density pack for printed wire board applications and 8-lead flat pack for surface mount assemblies. Both packages provide 7.5W of power at full load.

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