A 96.3% Efficient, 6mVpp Line Transient Response Time-Based Boost Converter With Feedback-PID for AMOLED Displays

In this paper, a time-based boost converter with line feedforward for AMOLED displays is presented. The time-based control features a novel feedback-PID (F-PID) structure, which enables to implement a line feedforward compensation with negligible impact on the controller area occupation. Moreover, the differential VCO employed in the proposed F-PID has a much larger gain compared to that of a conventional time-based PID (T-PID) structure, providing a considerable reduction in the output voltage offset related to the frequency mismatch. A 900 mA prototype converter with 2.3-to-4.8 V input and 5 V output voltage, fabricated in a 180-nm BCD process, shows an up to 6x reduction in the line transient response when compared to a peak-current-mode (PCM) boost converter for the same application. The die area is 4.1 mm^2, while the controller occupies only 0.21 mm^2 , which is almost 30% smaller compared to other published and commercially available products.