A SiC CMOS Linear Voltage Regulator for High-Temperature Applications

This paper establishes the first integrated silicon carbide (SiC) CMOS linear voltage regulator. The design provides for a continuous load current exceeding 100 mA and a 15 V output from an input voltage of 20 to 30 V. The foundation of the regulator's feedback loop is formed by a two-stage SiC operational amplifier. Both internal and external passive components are used in the frequency compensation network. An external 7.5 V supply is connected to the operational amplifier and acts as the reference voltage. At 400 °C, experimental results show a line regulation of better than 1.5 mV/V under a 100-mA load. The load regulation with a 30-V input and at 400 °C is shown to be 0.42 mV/mA. Sustained operation of the linear regulator is demonstrated over 30 h at 300 °C.