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A novel dual-regulating mechanism for dc-dc buck conversion, which employs an inverter array based analog-to-digital (A/D) converter and the system feedback error signal to perform a fine regulation of the output voltage is presented. Based on this regulating mechanism, the proposed controller makes the output voltage converge efficiently. The proposed digital controller comprises a dual-regulating mechanism based error process unit (EPU), a PID compensator and a digital PWM. Moreover, a table look-up approach for the PID compensator alleviates the penalty of large chip area of multiplies. The proposed controller has been validated with simulation results.