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ADC is one of the key components employed in the digital controlled DC-DC converters. In this paper, a low power and high resolution algorithmic ADC is designed, which is suitable to the integrated digital controllers for high-frequency and low-power switched DC-DC converter. The designed 8-bit algorithmic ADC has 2 bits per stage. Simulation results show that ENOB up to 7.6bit is obtained. As one part of an integrated digital controller, the proposed ADC is successfully implemented in a 1MHz, wide output conversion range Buck converter. The results show that the Buck converter has the good characteristics of high stability and fast transient response, verifying the bright prospect of algorithmic ADC utilizing in the digital controllers of DC-DC Converters.