Patent ID: 7847624

Claim:
An internal power supply circuit, which generates an internal power supply from a first power supply, comprising: a first internal step-down power supply generation unit, which generates a first internal step-down power supply from said first power supply; a normal second internal step-down power supply generation unit, which generates a second internal step-down power supply from said first internal step-down power supply in the normal operating state, and which, at the time of power supply startup, begins operation to generate said second internal step-down power supply at a first timing at which a voltage of said first internal step-down power supply reaches a prescribed reference level; and, a startup power supply load unit, which begins to consume, before said first timing, current from said first internal step-down power supply, wherein said startup power supply load unit comprises a startup second internal step-down power supply generation unit, which, through current to be consumed from said first internal step-down power supply, generates the voltage of said second internal step-down power supply.