In this paper a state-space average model for boost switching regulators is presented. The presented model includes the most of the regulator’s parameters and uncertainties. This model can be used to design a precise and robust controller that can satisfy stability and performance conditions. In modeling, the load current is assumed to be unknown, and it is assumed that the inductor, capacitor, diode and regulator active switch are non ideal and they have a resistance in conducting condition. Other non ideal effects are also considered. After presenting the complete model, the boost converter Benchmark circuit is simulated in PSpice and its results are compared with our model simulation results in MATLAB.