Importance

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Abstract

Circuits and methods to trim analog integrated circuits, such as five-pin linear voltage regulators, after packaging are disclosed. In an exemplary embodiment, a test mode input circuit determines establishment of a test mode operation of the analog integrated circuit. A register control circuit generates a data signal and a plurality of control signals. A register circuit, including an input shift register and a plurality of storage devices, receives the data signal and the control signals, programs the storage devices as directed, and generates a plurality of trim control signals based on the states of the storage devices. A trim control circuit applies the trim control signals to modify a normal operation of the packaged analog integrated circuit. The analog integrated circuit and the circuits to trim the analog integrated circuit may be included in a same package.

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First Claim