An Integrated Switching Power Converter with a Hybrid Pulse-Train/PWM Control

This paper describes an integrated switching power converter with a hybrid control scheme. The design incorporates a pulse-train control for fast and smooth transient response, and an analog PWM control for low ripple voltage regulation. The converter was designed with a TSMC 0.35 mum CMOS N-well process. The simulation results show that, with a supply voltage of 3.3 V and a maximum load power of 225 mW, the output voltage is well regulated with a ripple voltage down to 6 mV. A fast and smooth transient response is observed with less than 5-mus settling time. The maximum power efficiency is 92.4%with a power range of 30 mW to 225 mW. The entire chip area is 1.69 mm², including on-chip power transistors. The research provides an effective solution to high-performance integrated power converter designs.