LM4431

Micropower Shunt Voltage Reference

General Description

Ideal for space critical applications, the LM4431 voltage ref-

erence is available in the sub-miniature (3 mm x 1.3 mm)

SOT-23 surface-mount package. The LM4431’s advanced

design eliminates the need for an external stabilizing capaci-

tor while ensuring stability with any capacitive load, thus

making the LM4431 easy to use. The operating current

range is 100 µA to 15 mA.

The LM4431 utilizes fuse and zener-zap reverse breakdown

voltage trim during wafer sort to ensure that the parts have

ence temperature drift curvature correction and low dynamic

impedance ensure stable reverse breakdown voltage accu-

racy over a wide range of operating temperatures and cur-

rents.

Features

n Small package: SOT-23

n No output capacitor required

n Tolerates capacitive loads

n Fixed reverse breakdown voltage of 2.50V

Key Specifications

n Wide operating current range: 100 µA to 15 mA

n Commercial temperature range: 0˚C to +70˚C

n Low temperature coefficient: 30 ppm/˚C (typ)

Applications

n Portable, Battery-Powered Equipment

n Data Acquisition Systems

n Instrumentation

n Process Control

n Energy Management

n Product Testing

n Power Supplies

Connection Diagram

SOT-23 Package Marking Information

Only three fields of marking are possible on the SOT-23’s small surface. The following table gives the meaning of the three

fields.

Part Marking

Field Definition

S2E

First Field:

S = Reference

Second Field:

2 = 2.500V Voltage Option

Third Field:

SOT-23

DS011374-1

* This pin must be left floating or connected to pin 2.

Top View

Order Number LM4431M3-2.5

See NS Package Number M03B

(JEDEC Registration TO-236AB)

July 1998

© 1998 National Semiconductor Corporation

DS011374

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