Abstract: A multi-phase brushless DC motor driving circuit includes a driving-stage circuit, a PWM generator, a control circuit and a plurality of current detection circuits. The driving-stage circuit includes a plurality of sub-driving circuits each having a high-side transistor and a low-side transistor. The current detection circuits detect the current at a node between the high-side transistor and the low-side transistor of the corresponding sub-driving circuit, and then generate a current detection signal. According to the current detection signals, the control circuit controls the PWM generator to generate a plurality of PWM signals for controlling the conducting and cutting off of the high-side transistor and the low-side transistor of each sub-driving circuit, and to provide a driving current to drive a multi-phase brushless DC motor.