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A prototype second-stage buck DC-DC converter has been designed in 130 nm CMOS and fully characterized. This circuit provides up to 3 A at an adjustable output voltage of 0.6-1.5 V from an intermediate bus voltage of 2.5 V. Hardening-by-design techniques have been systematically used, and the prototype successfully passed TID irradiation up to 200 Mrad (SiO2) and Single Event Effects tests with a heavy ion beam. Safe integration on-board requires an optimized PCB design and bump-bonding assembly to reduce parasitic inductances along the input current path.

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