On October 21, 2026, EDN reported Microchip’s POL-05-20S-T radiation-tolerant GaN point-of-load converter for space electronics. The synchronous buck converter delivers up to 20 A continuously, accepts 4.75–13.2 V input, provides adjustable 0.7–5 V output, and operates at full load from −55°C to +100°C. Its electrical parameters are specified before and after irradiation to 50 krad(Si), with single-event effects characterised to a linear energy transfer of 43 MeV·cm²/mg. The device is supplied in a 1.51 × 1.51 × 0.45-inch surface-mount package and is available in production quantities.
For a lunar ark, the converter addresses a critical failure point between power generation, storage, and digital loads such as FPGAs and microcontrollers. GaN power HEMTs provide high efficiency and power density, while current-mode control enables rapid transient response; the stated radiation qualification supports deployment behind shielding, although the 50 krad(Si) total-dose limit and LET 43 MeV·cm²/mg characterisation must be compared with each habitat’s calculated mission dose, solar-particle events, and secondary radiation. Compact 20-A regulation can reduce power-system mass and support redundant autonomous control, but it does not by itself guarantee long-duration reliability or immunity to all single-event effects.
The Ark team should evaluate the POL-05-20S-T and comparable rad-tolerant GaN converters in a qualification matrix covering lunar-orbit and surface spectra, shielding thickness, thermal cycling, vacuum operation, ageing, latch-up, burnout, and post-irradiation performance. Integrate candidate converters into redundant low-voltage power architectures for life support, data preservation, robotics, and reactor-control electronics, while maintaining cold spares and fault-isolated rails. Require component-level evidence beyond the published 50 krad(Si) and LET 43 MeV·cm²/mg limits before design freeze.