A DC-DC converter for short-channel CMOS technologies

An integrated DC-DC converter with two passive external components was designed and fabricated in an advanced, short-channel (L/sub eff/<0.2 /spl mu/m, V/sub dd/<2 V) CMOS technology. This design was undertaken to examine the feasibility of implementing an inductive buck converter with passive components small enough to fit entirely within a packaged chip. High switching frequencies (>10 MHz) were used to minimize the size of external components, and novel circuits were used to reduce the stress on the short channel devices. Measured efficiencies for a 3.3 V to 1.65 V converter were approximately 75% for output currents from 15 to 40 mA.