Importance

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Abstract

Disclosed are techniques for a power management integrated circuit (PMIC) to support a power-up sequence from a powered-down state to a powered-up state when both a main supply voltage and a backup supply voltage are present or when only the backup supply voltage is present. The PMIC may monitor the two supply voltages to identify the supply voltages that are present. The PMIC may be configured with a power-up initialization mode of operation through an EFUSE/MTP register, including a first bit to control power up of a voltage regulator of the PMIC with the main supply voltage or the backup supply voltage. Another bit may control power up of the voltage regulator with the backup supply voltage in the dual-supply or the single-supply configuration. The PMIC may execute one of four power-up sequences based on the monitored status of the supply voltages and the configured power-up initialization mode of operation.

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First Claim