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LM4051

Precision Micropower Shunt Voltage Reference

General Description

Ideal for space critical applications, the LM4051 precision

voltage reference is available in the sub-miniature (3 mm x

1.3 mm) SOT-23 surface-mount package. The LM4051’s ad-

vanced design eliminates the need for an external stabilizing

capacitor while ensuring stability with any capacitive load,

thus making the LM4051 easy to use. Further reducing

design effort is the availability of a fixed (1.225V) and adjust-

able reverse breakdown voltage. The minimum operating

current is 60 µA for the LM4051-1.2 and the LM4051-ADJ.

Both versions have a maximum operating current of 12 mA.

The LM4051 comes in three grades (A, B, and C). The best

grade devices (A) have an initial accuracy of 0.1%, while the

B-grade have 0.2% and the C-grade 0.5%, all with a tempco

of 50 ppm/˚C guaranteed from −40˚C to 125˚C.

The LM4051 utilizes fuse and zener-zap trim of reference

voltage during wafer sort to ensure that the prime parts have

an accuracy of better than

0.1% (A grade) at 25˚C.

Features

n Small packages: SOT-23

n No output capacitor required

n Tolerates capacitive loads

n Reverse breakdown voltage options of 1.225V and

adjustable

Key Specifications (LM4051-1.2)

Output voltage tolerance

(A grade, 25˚C)

0.1%(max)

Low output noise

(10 Hz to 10kHz) 20µV

rms

Wide operating current range 60µA to 12mA

Industrial temperature range −40˚C to +85˚C

Extended temperature range −40˚C to +125˚C

Low temperature coefficient 50 ppm/˚C (max)

Applications

n Portable, Battery-Powered Equipment

n Data Acquisition Systems

n Instrumentation

n Process Control

n Energy Management

n Automotive and Industrial

n Precision Audio Components

n Base Stations

n Battery Chargers

n Medical Equipment

n Communication

Connection Diagrams

SOT-23

10122201

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

10122240

Top View

See NS Package Number MF03A

March 2005

LM4051 Precision Micropower Shunt Voltage Reference