LM431

SNVS020H – MAY 2000 – REVISED JANUARY 2016

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8 Detailed Description

8.1 Overview

The LM431 is an adjustable precision shunt voltage regulator with ensured temperature stability over the entire

temperature range. The part has three different packages available to meet small footprint requirements, and is

available in three different tolerance grades.

8.2 Functional Block Diagram

Figure 9. LM431 Symbol

Figure 10. LM431 Block Diagram

8.3 Feature Description

The LM431 is a precision Zener diode. The part requires a small quiescent current for regulation, and regulates

the output voltage by shunting more or less current to ground, depending on input voltage and load. The only

external component requirement is a resistor between the cathode and the input voltage to set the input current.

An external capacitor can be used on the input or output, but is not required.

10

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