A radiation-hardened Buck converter

Buck converter is widely used in the aerospace field. However, radiation in the aerospace environment will result in degradation or failure of devices and circuits. This paper presents a radiation-hard Buck, which is an adaptive on-time Buck. A radiation-hard adaptive on-time generator is proposed by utilizing of leakage current compensation. The proposed radiation-hard adaptive on-time generator is composed of an adaptive on-time timing block and a charging current generator. Finally, the proposed Buck is fabricated in a standard 0.18 mu m BCD process. And the radiation tests show that the Buck still maintains stability after total ionizing dose irradiation at a total dose of 350 Krad (Si).