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A Fast-Transient Quasi-V ^{\bf 2} Switching Buck Regulator Using AOT Control With a Load Current Correction (LCC) Technique

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3 Author(s)
Chien-Hung Tsai ; Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Shih-Mei Lin ; Chun-Sheng Huang

A switching regulator with quasi-V2 adaptive on-time (AOT) control that provides a fast load transient response is proposed in this paper. The feed-forward path network allows the proposed switching regulator to achieve a fast transient response and stable operation without requiring an output capacitor with large equivalent series resistance. The proposed adaptive on-time controller makes the switching frequency pseudofixed in the continuous conduction mode and works in the pulse-frequency modulation mode under ultralight-load conditions to maintain the conversion efficiency. The AOT controller adjusts the on-time according to the supply voltage and load current conditions. The measurement results verify that the switching regulator can operate under load current between 5 and 800 mA for the supply voltage of 3.3-4.2 V and an output voltage of 1.2 V. The recovery time is 3.6 μs and the voltage drop is 75 mV when the load current is increased from 5 to 750 mA.

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Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 8 )