Patent ID: 8514013

Claim:
An integrated circuit device comprising: a plurality of integrated circuit chips having an integrated circuit operated at a specified voltage level; and an interposer, wherein the interposer comprises: a voltage boosting supply circuit that boosts a power-supply voltage supplied from a power supply to the specified voltage level and supplies a voltage to the integrated circuit of the integrated circuit chips; and a chip control circuit that selects at least one of the plurality of integrated circuit chips and controls the integrated circuit so that the selecting integrated circuit chip is operated using the voltage supplied from the voltage boosting supply circuit, the chip control circuit changes number of the selecting integrated circuit chips based on a specified control signal, and the voltage boosting supply circuit comprises: a boost converter having a inductor connected in series between an input terminal supplied with the power supply voltage and an output terminal supplying a voltage to the integrated circuit of the integrated circuit chip, a rectifying element connected in series between the inductor and the output terminal and rectifying current to a direction from the input terminal to the output terminal, and a switching element connected between the inductor and the rectifying element in parallel with the output terminal as viewed from the inductor; a number-of-chip detecting circuit detecting number of operating integrated circuit chips that is number of the integrated circuit chips operating at the voltage supplied from the voltage boosting supply circuit based on a voltage of the output terminal of the boost converter after reduction when the voltage of the output terminal of the boost converter is reduced during being performed a voltage boosting switching control that controls the switching element so that the output terminal voltage reaches the specified voltage level; and a switching control circuit generating a control clock signal having turn-on time and turn-off time adjusted based on the detected number of operating integrated circuit chips and performing the voltage boosting switching control using the generated control clock signal.