A 7-MHz Integrated Peak-Current-Mode Buck Regulator With a Charge-Recycling Technique

A 7-MHz integrated peak-current-mode buck regulator with a charge-recycling technique and a fast response current-sensing circuit is proposed. The proposed charge-recycling technique contributes to the improvement of the light load efficiency by up to 1.7% for the proposed buck regulator. Moreover, the proposed buck regulator achieves a fast response time of less than 10 ns with a fast response current-sensing circuit. Applying the proposed charge-recycling technique and the current-sensing circuit, the peak-current-mode buck regulator for the mobile application is realized with an operating frequency of 7 MHz, an output voltage of 0.8 V, a maximum load current of 500 mA, and a peak efficiency of over 77%.