隨著可攜式產品市場之高度成長及更為複雜的SoC系統，高效能電源管理晶片之需求隨之提高，例如快速暫態響應之需求；而快速暫態響應設計可適用於現今常見具備動態電壓調整技術(Dynamic Voltage Scaling,DVS)整合之SoC單晶片。
本篇論文提出之快速暫態響應技術，不需另外加入暫態感測機制，如此可避免暫態感測機制誤判並確保系統運作穩定，兼具高轉換效率及較快之暫態響應表現。本晶片以低複雜度方式將輸出端之變化資訊透過電流偵測器反映至內部電流迴路上，並以回授控制調整外部電壓迴路響應，使輸出電壓得以穩定。本篇論文亦根據小信號模型，及頻域之模擬結果驗證本篇論文所提出之快速暫態響應技術，在頻寬及相位裕度皆可獲得改善，將大幅降低暫態回復時間，使電源管理晶片在應用上之彈性及操作上之可靠度皆得以增加。
本篇論文提出一具快速暫態響應之電流模式切換式穩壓器，以TSMC 0.35um 5V製程製作。輸入電壓及輸出電壓分別為5V及3.3V，切換頻率為500 kHz，負載電流範圍為150mA~550mA。模擬結果顯示整體效率高於90%。暫態回復速度由70μs改善為20μs以內，改善幅度在70%以上。

With the fast growing market of the portable devices and the SoC trend, high performance power management ICs with fast dynamic responses have drawn more and more attentions, especially for the SoC system with Dynamic Voltage Scaling (DVS) technique.
A current-mode buck converter with fast transient responses is presented in this thesis. The fast transient technique does not need an additional transient detector, which can avoid errors caused by the transient detector and ensure the system stability. This technique is a low-complexity solution, which transfers the voltage variation on the output terminal to the inner current loop through the current sensing circuit, and then adaptively adjusts the level of the ramp waveform in the outer voltage loop. The small-signal model of the proposed converter is also presented, which shows that both of the bandwidth and phase margin are improved. As a result, transient recovery time can be significantly reduced. The transient detector and ensure the system stability
The chip was fabricated by using TSMC 0.35um 5V CMOS process. The input voltage is 5V and the output voltage is set to 3.3V. The switching frequency is 500 kHz and the range of the load current is 150~550mA. [Simulation results show the efficiencies are all over 90%. The recovery time of the transient response can be reduced by 70%.]

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