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An integrated digital buck DC-DC converter based on a 0.5μm standard CMOS process is presented in this paper. Its switching frequency is 5 MHZ and no extra high frequency clock is needed. The delay-line ADC with a self-calibration loop utilized in the converter has low sensitivity to the process, voltage, temperature and loading (PVTL). The DPWM in the proposed DC-DC converter employs a first-order Σ-Δ modulator to achieve an equivalent resolution of 10bit. The simulation results show that the proposed DC-DC converter can operate at the supply voltage range of 2.7 to 3.6V with a transient response time of 30 μs. The peak efficiency reaches 94%.

A 5MHz integrated digital DC-DC converter with a delay-line ADC and a Σ-Δ DPWM