The design of DC-DC Converter with DT-CMOS Switch

This paper is proposed DC-DC Converter with DT-CMOS (Dynamic Threshold voltage MOSFET) Switch. The proposed circuit is evaluated and compared with CMOS switch by both circuit simulation and device simulation. DT-CMOS switch reduces the output ripple and the conduction loss through a low on-resistance. Therefore, proposed converter has a excellent performance efficiency than converter with conventional CMOS switch. Proposed converter has switching frequency of 1.2MHz, 3.3V input voltage, 2.5V output voltage, and maximum current of 100mA. Also, this paper proposes two protection circuit in order to ensure the reliability. The first function is UVLO(under voltage lockout) and the second function is TSD(thermal shutdown). So, proposed converter can be protected from input under-voltage and over temperature.