Design Of A DC-DC Converter Chip With Bi-directional Data Interface

With the development of semiconductor technology, the critical dimension of integrated circuit can achieve is shrinking, and more and more devices or chips are integrated on one chip. The operation speed becomes faster and faster, so the products continually increasing demands on the power supply. Therefore simply to improve the switching converter efficiency has become increasingly unable to solve the fundamental problem. Compared to the analog supply, digital power is easy to implement modular and has a short design cycle. It also can achieve advantages such as good performance in a smaller line width process. The digital power market continues to expand, especially in the high-end products.This thesis is targeted at power digital trend. In this thesis, I2C which is a bi-directional data interface and on-chip compensation are researched. At the same time, the DAC (digital-to-analog converters) and ADC(analog-to-digital converter) are introduced, and it laid the foundation for the power digitize.The DC-DC converter output voltage is0.7V-1.8V with a step of25mV. Using the on-chip Phase Lead Compensation effectively reduces the number of devices. DAC whose output varies from0.7V to1.8V with a step of25mV provides a stable reference voltage to DC-DC converter. DAC output can be controlled via I2C, and you can also set the DIP switch of external. ADC which integrated in the system for collecting load information was used to quantify the difference between the output voltage and the DAC reference for the digital output. The I2C has written and read function. The I2C can control the DAC output and then control the output of the DC-DC converter. I2C also can read the ADC error information, and monitor changes in load.After circuit design, simulation, layout, and test, the basic functions of the Buck Converter are reached.