Thin Gate Oxide CMOS DC-DC Buck Converter with Floating Gate Drivers

This document is a model and instructions for <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">DTEX</tex> . This work focuses on the design of a CMOS DC-DC buck converter targeting input voltages higher than the limited gate-source voltage common in thin oxide technology. This is enabled by driving the power device gates using fully integrated circuitry which allows floating voltages in the high -side device using bootstrapping. The gate driver has been fully characterized in simulation, showing low to high an high to low times below <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$12ns$</tex> . The bootstrapped level shifter has been integrated together with a dual-NMOS half bridge using the Skywater 130nm Opensource CMOS technology. Simulations show a peak efficiency of 91 % at 38.2mA current load for a 10V to 3.3V DC-DC conversion, extending the input voltage range previously reported in this technology by <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2X</tex> .