LM349 National Semiconductor, LM349 Datasheet

LM349

Manufacturer Part Number

LM349

Description

Quad 741 Op Amps LM149 Wide Band Decompensated (AV MIN = 5)

Manufacturer

National Semiconductor

Datasheet

1.LM349.pdf (10 pages)

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Current page: 1 of 10
Download datasheet (292Kb)

LM3490

100 mA, SOT-23, Quasi Low-Dropout Linear Voltage

Regulator with Logic-Controlled ON/OFF

General Description

The LM3490 is an integrated linear voltage regulator. It fea-

tures operation from an input as high as 30V and a guaran-

teed maximum dropout of 1.2V at the full 100 mA load. Stan-

dard packaging for the LM3490 is the 5-lead SOT-23

package. A logic-controlled ON/OFF feature makes the

LM3490 ideal for powering subsystems ON and OFF as

needed.

The 5, 12, and 15V members of the LM3490 series are in-

tended as tiny alternatives to industry standard LM78LXX

series and similar devices. The 1.2V quasi low dropout of

LM3490 series devices makes them a nice fit in many appli-

cations where the 2 to 2.5V dropout of LM78LXX series de-

vices precludes their (LM78LXX series devices) use.

The LM3490 series features a 3.3V member. The SOT pack-

aging and quasi low dropout features of the LM3490 series

converge in this device to provide a very nice, very tiny 3.3V,

100 mA bias supply that regulates directly off the system

Typical Application Circuit

Connection Diagram

5% power supply.

5-Lead, Molded-Plastic Small-Outline Transistor (SOT) Package

DS100071

Package Code MA05B(Note 1)

SOT-23 Package

Top View

Key Specifications

n 30V maximum input for operation

n 1.2V guaranteed maximum dropout over full load and

n 100 mA guaranteed load current

n −40 to +125˚C junction temperature range for operation

Features

n 3.3, 5, 12, and 15V versions available

n Logic-controlled ON/OFF

n Packaged in the tiny 5-lead SOT-23 package

Applications

n Tiny alternative to LM78LXX series and similar devices

n Tiny 5V

n Post regulator for switching DC/DC converter

n Bias supply for analog circuits

DS100071-1

temperature ranges

and temperature ranges

5% guaranteed output voltage tolerance over full load

5% to 3.3V, 100 mA converter

DS100071-2

www.national.com

June 1999

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