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PDF LM349 Data sheet ( Hoja de datos )
| Número de pieza | LM349 | |
| Descripción | Quad 741 Op Amps LM149 Wide Band Decompensated (AV MIN = 5) | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 1999
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
5V±5% power supply.
Key Specifications
n 30V maximum input for operation
n 1.2V guaranteed maximum dropout over full load and
temperature ranges
n 100 mA guaranteed load current
n ±5% guaranteed output voltage tolerance over full load
and temperature ranges
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±5% to 3.3V, 100 mA converter
n Post regulator for switching DC/DC converter
n Bias supply for analog circuits
Typical Application Circuit
Connection Diagram
DS100071-2
DS100071-1
Top View
SOT-23 Package
5-Lead, Molded-Plastic Small-Outline Transistor (SOT) Package
Package Code MA05B(Note 1)
© 1999 National Semiconductor Corporation DS100071
www.national.com
1 page  
LM3490-12, LM3490-15 (Continued)
Note 9: A typical is the center of characterization data taken with TA = TJ = 25˚C. Typicals are not guaranteed.
Note 10: All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production with TA = TJ = 25˚C. All hot and cold lim-
its are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control.
Note 11: All voltages except dropout are with respect to the voltage at the GND pin.
5 www.national.com
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