Patent ID: 9036443
Filing Date: 2015-05-19
Classification: G11C,H02M

Abstract:
1. An integrated circuit device that comprises: an integrated circuit chip equipped with an integrated circuit; and an interposer equipped with a booster supply circuit which is capable of boosting up a power source voltage supplied from a power source side and supplying the boosted-up voltage to the integrated circuit of the integrated circuit chip, wherein the booster supply circuit comprises: a first boost converter configured to include: a first inductor connected in series between a first input terminal receiving a supply of the power source voltage and a first output terminal outputting a voltage; a first rectifying element connected in series between the first inductor and the first output terminal and configured to rectify electric current in a direction from the first input terminal toward the first output terminal; and a first field-effect transistor placed between the first inductor and the first rectifying element and connected in parallel with the first output terminal viewed from the first inductor; a second boost converter configured to include: a second inductor connected in series between a second input terminal receiving an input of the voltage of the first output terminal of the first boost converter and a second output terminal supplying a voltage to the integrated circuit of the integrated circuit chip; a second rectifying element connected in series between the second inductor and the second output terminal and configured to rectify electric current in a direction from the second input terminal toward the second output terminal; and a second field-effect transistor placed between the second inductor and the second rectifying element, connected in parallel with the second output terminal viewed from the second inductor and configured to have a higher threshold voltage than the first field-effect transistor and withstand a voltage of not lower than a predetermined operating voltage as a voltage which the integrated circuit operates; and a switching control circuit configured to perform switching control of the first field-effect transistor of the first boost converter to make the voltage of the first output terminal equal to a predetermined low voltage, which is specified in advance as a lower voltage than the operating voltage, when the voltage of the first output terminal of the first boost converter is not higher than the predetermined low voltage, and to perform switching control of the second field-effect transistor of the second boost converter to make the voltage of the second output terminal of the second boost converter equal to the operating voltage after the voltage of the first output terminal of the first boost converter reaches the predetermined low voltage.