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Adjustable negative regulator

LM337 Internal Circuitry

Explore the internal circuitry and functional stages of LM337.

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Inside LM337

The negative-reference control loop inside the regulator body.

LM337 compact package cutaway with negative reference,error amplifier,pass stage and protection. ADJ1 IN2 OUT3; tab input.
Functional architecture, not a transistor-level die layout.

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Select a stage to see its role and connections

Compare the reference

Maintain OUT minus ADJ near −1.25 V.

Control negative-rail current

Adjust the series stage between negative input and output.

Protect the pass device

Current, thermal and safe-area protection constrain abnormal operation.

Component view