Design of a monolithic high frequency fast transient buck for portable application

The earth is mobile. There is a huge market for mobile power management ICs today and in the future. Fast transient response, efficient performance, small profile and low cost are the most desired features for mobile power management IC. In this paper, a 2 MHz high efficiency, wide input range monolithic buck DC-DC converter ASIC is designed based on advanced trench BCD process. Some important design issues such as compensator design for wide range of input, output voltage and load current, linear-non-linear control for fast transient response, efficiency optimisation, device optimisation, noise separation and driver design are discussed. The experiment test results show that the ASIC works well.