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Using a linear regulator to produce a constant current source

Posted: 30 Jul 2009 ?? ?Print Version ?Bookmark and Share

Keywords:voltage regulator? constant current? LDO? linear regulator?

This document shows how to use linear voltage regulators to provide a constant current. Two circuits are presented, one for high-side and another for low-side current sources. The MAX1818 and MAX1735 LDOs are featured in the designs.

Linear voltage regulators provide one of the simplest ways to produce a constant current. Because the voltage between a linear regulator's output and ground is tightly regulated, a fixed resistor connected between those two nodes produces a constant current between the output and ground.

View the PDF document for more information.

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