ST, Xilinx team to power rad hard FPGAs

August 26, 2021 // By Nick Flaherty
ST, Xilinx team to power rad hard FPGAs
ST’s RHRPMPOL01 rad-hard point of load 7A monolithic synchronous step-down regulator and RHFL6000A linear voltage regulator are used to support a Xilinx UltraScale FPGA in space designs

STMicroelectronics has partnered with Xilinx on a power design for the Xilinx Kintex UltraScale XQRKU060 radiation-tolerant FPGA.

The design uses QML-V qualified voltage regulators from ST’s space-products portfolio.

The XQRKU060 FPGA provides a combination of high compute density and integration that historically required an application-specific IC (ASIC), which typically involves custom design with associated engineering expenses and turnaround time. Unlike an ASIC, the XQRKU060 FPGA can be reconfigured in orbit, allowing bug fixes and updates to be applied cost-effectively at any time to protect the mission.

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ST worked closely with Xilinx to design a power source that ensures reliable operation of the XQRKU060 by providing excellent fixed-point voltage accuracy as well as stability in the event of transients due to normal FPGA operation and radiation events. The design uses ST’s RHRPMPOL01 rad-hard point of load 7A monolithic synchronous step-down regulator and RHFL6000A linear voltage regulator, all SEL immune and QML-V qualified. These devices meet the requirement for an input voltage up to 12V and output voltage down to 0.8V. Both exhibit high fixed-point accuracy with radiation performance that ensures high resistance to Total Ionizing Dose (TID) thereby minimizing any output-voltage drift.

The fast transient response of the RHRPMPOL01 and RHFL6000A maintains the regulated output in the event of large and rapid changes in current demand as the FPGA continuously activates and deactivates internal circuitry during normal operation. Their radiation hardness also resists disruption due to single-event transient (SET) radiation encountered in space.

The RHRPMPOL01 (SMD 5962R20208) is a complete point-of-load (PoL) converter that contains an N-channel power MOSFET, bootstrap diode, and system protection. By supporting synchronization and current sharing it can handle demanding loads such as FPGAs, as well as microprocessors and ASICs. The device is Radiation Hardness Assured (RHA) up to 100krad(Si), and Single Event Latch-up (SEL) and Single Event Snap-Back (SESB) free up to 70Mev.cm2/mq. Single-event upset (SEU) and single-event functional interruption (SEFI) are characterized at 7V operating voltage.

The RHFL6000A (SMD 5962F15216) is a low-dropout regulator with adjustable output voltage, built-in protection, and circuitry for remote sensing and external inhibit control. Dedicated internal circuitry for absorbing transients ensures SET below 3.3% of Vout at 120MeV, and the device is SEL-free up to 120Mev.cm2/mq.

Radiation reports for both ST devices are available upon request.;

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