VOLTAGE REGULATION SYSTEM FOR INTEGRATED CIRCUIT

摘要

An integrated circuit (IC) with voltage regulation includes high power and low power domains, low and high voltage regulators and a low power regulator. The low voltage regulator powers the high and low power domains when the IC is in a HIGH power mode. The low power regulator receives a voltage from a high voltage regulator and powers the low power domain when the IC is in a LOW power mode. The IC includes a switching module that disconnects the low voltage regulator from the low power domain when the output voltage of the high voltage regulator is lower than a threshold voltage during power-up and connects the low voltage regulator to the low power domain when the voltage regulated by the high voltage regulator exceeds the threshold voltage.

主权项

1. An integrated circuit operable in a low power mode and a high power mode, comprising:
a low power domain; a high power domain; a first voltage regulator that regulates a voltage provided to the high and low power domains at a first voltage level when the integrated circuit is in the high power mode and is switched off when the integrated circuit is in the low power mode; a second voltage regulator that generates a voltage that is regulated at a second voltage level, and operates in both of the high and low power modes; a third voltage regulator, connected between the second voltage regulator and the low power domain, that receives the voltage regulated by the second voltage regulator and regulates a voltage provided to the low power domain at a third voltage level when the integrated circuit is in the low power mode and is switched off when the integrated circuit is in the high power mode; and a switching module, connected to the second voltage regulator, and between the first voltage regulator and the low power domain, that receives and compares the voltage regulated by the second voltage regulator with a first threshold voltage, and connects the first voltage regulator to the low power domain when the voltage regulated by the second voltage regulator is greater than the first threshold voltage.