El Segundo, Calif.—International Rectifier's line of radiation-hardened (RAD-Hard) ultra-low dropout (ULDO) voltage regulators are suited to satellites and space exploration vehicles where power consumption is a critical parameter. Compared to competing solutions, the ULDO's dropout voltage has been brought down to 0.4 volt, according to the company, resulting in a 60 percent decrease in power consumption.
Two groups of ULDOs are available. The 3.3-volt input devices, in three basic versions, are available with a 2.5- or 1.8-volt fixed, or adjustable (1.265 to Vin— 0.4 volt) output. The 5-volt input devices, also in three basic versions, have fixed 2.5- or 3.3-volt, or adjustable (1.265 to Vin— 0.4 volt) outputs.
The regulators, suited for space-level point-of-load and post-DC/DC power conversion for field-programmable gate arrays (FPGAs) and digital signal processing (DSP) controllers, tout low noise and fast transient response. The ULDOs maintain their performance throughout their current range, and reportedly have as much as three times more radiation hardness than competing devices.
The ULDOs are characterized to single event effect (SEE), with a linear energy transfer (LET) of 84 MeV/(mg/cm2), as well as total ionizing dose (TID) of up to 1 Mrad (Si) and enhanced low dose rate sensitivity (ELDRS) of up to 500 krad (Si) in accordance with MIL-STD-883, Method 1019.6, test condition D. These parts are suited for satellites operating from near-earth orbit to deep space and are available in either space level or unscreened versions.
The voltage regulators are offered in two hermetic package styles: MO-078AA (0.69-by-0.82 inch footprint) for printed wire board applications, and 8-lead flat pack (0.75-by-0.75 inch) for surface mount assemblies. Both packages can handle 7.5 watts at full load.
Click here for the IRUH33P253B1M product datasheet (3.3 volts in, 2.5 volts out). Pricing begins at $610 each in 100s.
International Rectifier, 1-310-252-7105, www.irf.com