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Fixed 3.3 V LDO regulator

LM1117-3.3 Internal Circuitry

Explore the internal circuitry and functional stages of LM1117-3.3.

Package view

Inside LM1117-3.3

A compact fixed-output feedback loop inside the package.

LM1117-3.3 package cutaway with reference, feedback divider, error amplifier, series pass stage and thermal/current protection.
Functional cutaway; it does not represent physical silicon placement.

Explore the circuit

Select a stage to see its role and connections

Internal set point

The fixed-output part includes the feedback network that sets 3.3 V.

Feedback correction

The amplifier changes pass-stage drive to oppose output disturbances while headroom remains.

External loop support

The output capacitor and its ESR affect the stability of this control loop.

Component view