Voltage regulator module

A voltage regulator module, comprising:

• a circuit board assembly comprising a printed circuit board and at least one switch element, wherein the printed circuit board has a first surface and a second surface which are opposed to each other, the printed circuit board comprises a first concave structure and at least one protrusion post, wherein the first concave structure is concavely formed on the second surface of the printed circuit board, the protrusion post is disposed within the first concave structure, and the protrusion post has internal traces, wherein a pin as a positive input terminal, a pin as a positive output terminal and a pin as a negative output terminal of the voltage regulator module are disposed on the second surface of the printed circuit board, and the at least one switch element is disposed on the first surface of the printed circuit board;
• and
• a magnetic core assembly accommodated within the first concave structure, and comprising at least one opening, wherein the protrusion post is penetrated through the corresponding opening, so that at least one inductor is defined by the at least one protrusion post and the magnetic core assembly collaboratively.