Importance

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Abstract

A power supply switching circuit employs hysteresis to ensure stable, timely, and accurate transition between a primary power source and a secondary power source of an integrated circuit. A comparison element of the circuit compares a first voltage signal derived from a primary voltage of the primary power source to a second voltage signal provided by the secondary power source in order to generate a compare output signal. A voltage divider element of the circuit, characterized as having a RC constant, is coupled to the primary power source and receives the compare signal generated by the comparison element and generates the first voltage signal. A bypass element of the circuit is coupled to the voltage divider element and is controlled by the compare signal to bypass the RC constant of the voltage divider element by immediately pulling the first voltage signal to the primary voltage when, after powering up the primary power source, the first voltage signal becomes greater than the second voltage signal.

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First Claim