Abstract: By analyzing the architecture of current mode DC-DC converter, a novel lossless low-power current-sensing technique for minimizing the static power of DC-DC converter is proposed in the paper. It adopts a lossless current-sensing method and an improved low power current amplifier. The proposed technique can reduce the power of current-sensing circuit and result in the static power optimization of current mode DC-DC converter. Simulation results show that static power of the current mode buck converter based on the proposed technique is 61.22mW, which is only 57.5% compared to the converter with the typical circuit.