An integrated dual-output buck converter based on sliding mode control

The design, implementation, and testing of an integrated dual-output buck converter is presented in this paper. The proposed architecture consists of a simple, versatile, and robust hysteretic controller based on sliding mode theory. The proposed topology implements only three switches (instead of four switches in conventional solutions), and can save additional silicon area with proper design of the power switches in the voltage regulator. The IC prototype was fabricated in standard 0.5 μm CMOS technology (V_THN ≈ 0.78 V, V_THP ≈ -0.93 V), operates with an input voltage of 1.8 V, generates 1.2 V and 0.9 V output-voltage levels, and supplies a maximum current of 200 mA, reaching up to 88% efficiency.