具快速動態電壓調整能力之高效率、低輸出電壓漣波的電源管理積體電路

本論文設計一個電源管理積體電路，具有快速動態電壓調整的能力，可以隨著不同的負載需求調整輸出電壓。此技術可以提升整體效率以達到延長移動型電子產品的電池壽命。此電源管理積體電路同時具有高效率低雜訊的特色，輸出相當穩定的電壓給敏感負載使用。我們採用一個具高轉換效率的切換式電源供應器，串接一個具低電壓漣波優點的線性穩壓器來達到實作目標。切換式電源供應器採用固定責任週期的架構，而線性穩壓器的功率元件則選用N通道金氧半場效電晶體，達到高電源拒斥比與低線性跨壓的優點。根據模擬的結果，經由線性穩壓器串接的架構，可以將切換式電源供應器輸出電壓漣波下降至原本大小的2.74%，系統最高的轉換效率增加至87%，平均動態電壓調整速度為11.6us/0.3V。本電源管理積體電路採用TSMC 0.35 um 2p4m製程製造，量測結果不如預期，其原因推斷為比較器發生單邊遲滯現象，並經由模擬驗證我們的想法。

關鍵字

電源管理積體電路；動態電壓調整；切換式電源控制積體電路；線性穩壓器

並列摘要

In this paper, we design a power management IC (PMIC) with fast dynamic voltage scaling capability. The output voltage of this PMIC can be adjusted by controlling signals for different load requirements. With this technique, the overall conversion efficiency can be increased to extend the battery life in portable electronics. Moreover, this PMIC with high efficiency and low output voltage ripple supplies a stable output voltage to sensitive loads. This PMIC topology is a switching type power converter cascading a linear regulator. The switching converter uses a constant on-time control method. And in the linear regulator circuit, an N-channel MOSFET is chosen in our design for high PSRR and low dropout voltage. From simulation results, cascading a linear regulator would decrease the output voltage ripple to 2.74%, raise the maximum efficiency to 87%, and cut down the average tracking speed to about 11.6us/0.3V. This power management IC is implemented by TSMC 0.35 um 2p4m process. The measurement results are not as predicted by simulation because of the possible single hysteresis effect in the comparator, which is verified by simulation.

並列關鍵字

Power Management IC ； Dynamic Voltage Scaling ； Switching Type Power Converter IC ； Linear Regulator

參考文獻

[2] Ka Nang Leung, Philip K.T. Mok and Wing Hung Ki, ”A Novel Frequency Compensation Technique for Low-voltage Low-dropout Regulator,” IEEE International Symposium on Circuits and Systems, vol. 5, pp. 102-105, 1999.

[4] Ke-Horng Chen, Chien-Ching Chien, Hish-Hish Ho and Li-Ren Huang, ”Optimum Power-Saving Method for Power MOSFET Width of One-Cycle Control DC/DC Converter,” IEEE Power Electronic Specialists Conference, pp. 1-5, 18-22 June 2006.

[9] Feng Su, Wing-Hung Ki and Chi-Ying Tsui, “Ultra Fast Fixed-Frequency Hysteretic Buck Converter With Maximum Charging Current Control and Adaptive Delay Compensation for DVS Applications”, IEEE Journal of Solid-State Circuits, vol. 43, no. 4, April 2008.

[10] Wei-Jen Huang and Shen-Iuan Liu, “A Sub-1V Low-Dropout Regulator with an On-chip Voltage Reference”, IEEE Asian Solid-State Circuits Conference, November 3-5, 2008.

[11] Yung-Hsin Lin, Kuo-Lin Zheng and Ke-Horng Chen, “Smooth Pole Tracking Technique by Power MOSFET Array in Low-Dropout Regulators”, IEEE Transactions On Power Electronics, vol. 23, no. 5, September 2008.

國際替代計量

具快速動態電壓調整能力之高效率、低輸出電壓漣波的電源管理積體電路

全文下載

主題瀏覽