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US 2013/0159746 A1Published application
Data processing device and data processing system
AssigneeRenesas Electronics Corporation
InventorsSoichi Kobayashi, Akira Oizumi, Yoshihiko Yasu, Hiromi Notani
Life of this patent
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Abstract
A step down unit steps down an external power supply voltage Vcc. A bias current control circuit controls the magnitude of bias current flowing through an auxiliary path connecting an output node and the ground. A system controller increases the magnitude of the bias current, prior to a change of the operation state of a load circuit by which a relatively large change occurs to the amount of current consumed by the load circuit including a central processing unit.
Claims8
A data processing device comprising:
- a load circuit including a central processing unit and operated by supplied electric power;
- a step-down power supply circuit stepping down an external power supply voltage and having an output node connected to said load circuit, said step-down power supply circuit including
- a first step-down unit stepping down said external power supply voltage, and
- a bias current control circuit controlling a magnitude of bias current flowing through an auxiliary path from said output node to a ground;
- and
- a control unit increasing the magnitude of said bias current, prior to a change of an operation state of said load circuit by which a relatively large change occurs to an amount of current consumed by said load circuit.
3 more elements
A data processing system comprising:
- a printed circuit board;
- and
- a data processing device mounted on said printed circuit board,
- said data processing device including:
- a load circuit including a central processing unit and operated by supplied electric power;
- a step-down power supply circuit stepping down an external power supply voltage and having an output node connected to said load circuit,
- said step-down power supply circuit including
- a first step-down unit stepping down said external power supply voltage, and
- a bias current control circuit controlling a magnitude of bias current flowing through an auxiliary path from said output node to a ground;
- and
- a control unit increasing the magnitude of said bias current, prior to a change of an operation state of said load circuit by which a relatively large change occurs to an amount of current consumed by said load circuit.
8 more elements
Dependencies are inferred from the claim text.