LM4120

Precision Micropower Low Dropout Voltage Reference

General Description

The LM4120 is a precision low power low dropout bandgap

voltage reference with up to 5 mA output current source and

sink capability.

This series reference operates with input voltages as low as

2V and up to 12V consuming 160 µA (Typ.) supply current. In

power down mode, device current drops to less than 2 µA.

The LM4120 comes in two grades (A and Standard) and

seven voltage options for greater flexibility. The best grade

devices (A) have an initial accuracy of 0.2%, while the stan-

dard have an initial accuracy of 0.5%, both with a tempco of

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

The very low dropout voltage, low supply current and power-

down capability of the LM4120 makes this product an ideal

choice for battery powered and portable applications.

The device performance is guaranteed over the industrial

temperature range (−40˚C to +85˚C), while certain specs are

guaranteed over the extended temperature range (−40˚C to

+125˚C). Please contact National for full specifications over

the extended temperature range. The LM4120 is available in

a standard 5-pin SOT-23 package.

Features

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Small SOT23-5 package

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Low dropout voltage:

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High output voltage accuracy:

0.2%

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Source and Sink current output:

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Supply current:

160 µA Typ.

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Low Temperature Coefficient:

50 ppm/˚C

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Enable pin

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Fixed output voltages:

1.8, 2.048, 2.5, 3.0, 3.3, 4.096

and 5.0V

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Industrial temperature Range:

−40˚C to +85˚C

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(For extended temperature range, −40˚C to 125˚C,

contact National Semiconductor)

Applications

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Portable, battery powered equipment

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Instrumentation and process control

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Automotive & Industrial

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Test equipment

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Data acquisition systems

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Precision regulators

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Battery chargers

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Base stations

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Communications

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Medical equipment

Functional Block Diagram

10104701

Connection Diagram

10104702

Refer to the Ordering Information Table in this Data Sheet for Specific

Part Number

SOT23-5 Surface Mount Package

March 2005

© 2005 National Semiconductor Corporation

DS101047

www.national.com