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National Semiconductor
National Semiconductor

LM349 Datasheet

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


LM349 Datasheet Preview


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
Page 1

Ordering Information
Output
Voltage
(V)
3.3
3.3
5
5
12
12
15
15
Order
Number
(Note 2)
LM3490IM5-3.3
LM3490IM5X-3.3
LM3490IM5-5.0
LM3490IM5X-5.0
LM3490IM5-12
LM3490IM5X-12
LM3490IM5-15
LM3490IM5X-15
Package
Marking
(Note 3)
L78B
L78B
L79B
L79B
L80B
L80B
L81B
L81B
Comments
250 Units on Tape and Reel
3k Units on Tape and Reel
250 Units on Tape and Reel
3k Units on Tape and Reel
250 Units on Tape and Reel
3k Units on Tape and Reel
250 Units on Tape and Reel
3k Units on Tape and Reel
www.national.com
2
Page 2

Absolute Maximum Ratings (Note 4)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage (IN to GND)
Voltage ON/OFF to GND
Power Dissipation (Note 5)
Junction Temp. (TJ) (Note 5)
Ambient Storage Temp.
Soldering Time, Temp. (Note 6)
Wave
Infrared
Vapor Phase
35V
5.5V
400 mW
+150˚C
−65 to +150˚C
4sec., 260˚C
10sec., 240˚C
75sec., 219˚C
ESD (Note 7)
ON/OFF
All Other Pins
1.0kV
2.0kV
Operating Ratings (Note 4)
Maximum Input Voltage (IN to GND)
Voltage ON/OFF to GND
Junction Temperature (TJ)
Maximum Power Dissipation (Note 8)
30V
0 to 5V
−40 to +125˚C
300 mW
Electrical Characteristics
LM3490-3.3, LM3490-5.0
VIN = VNOM + 1.5V unless otherwise noted. Typicals and limits appearing in normal type apply for TA = TJ = 25˚C. Limits ap-
pearing in boldface type apply over the entire junction temperature range for operation, −40 to +125˚C. (Notes 9, 10, 11)
Symbol
VOUT
Nominal Output Voltage (VNOM)
Parameter
Conditions
Output Voltage
1 mA IOUT 100 mA
VOUT
VOUT
IGND
VIN -
VOUT
Line Regulation
Load Regulation
Ground Pin
Current
Dropout Voltage
VNOM + 1.5V VIN 30V,
IOUT = 1 mA
10 mA IOUT 100 mA
VNOM + 1.5V VIN 30V,
No Load
VON/OFF = 5V
VON/OFF = 0V
IOUT = 10 mA
IOUT = 100 mA
en
Output Noise
VIN = 10V,
Voltage
Bandwidth: 10 Hz to 100 kHz
3.3V
Typical
3.30
7
15
Limit
3.17
3.14
3.43
3.46
25
40
2
4
0.1
5
0.7
0.9
1.0
0.9
1.1
1.2
100
5.0V
Typical
5.00
9
15
Limit
4.80
4.75
5.20
5.25
25
40
Units
V
V(min)
V(min)
V(max)
V(max)
mV
mV(max)
mV
mV(max)
2 mA
4 mA(max)
0.1 µA
5 µA(max)
0.7 V
0.9 V(max)
1.0 V(max)
0.9 V
1.1 V(max)
1.2 V(max)
150 µVrms
VIL Maximum Low
Level Input
Voltage at
ON/OFF
VIH Minimum High
Level Input
Voltage at
ON/OFF
IIL VON/OFF = 0V
IIH VON/OFF = 5V
0.2 0.2 V(max)
2.0 2.0 V(min)
−1 −1 µA(max)
1 1 µA
20 20 µA(max)
3 www.national.com
Page 3

LM3490-12, LM3490-15
VIN = VNOM + 1.5V unless otherwise noted. Typicals and limits appearing in normal type apply for TA = TJ = 25˚C. Limits ap-
pearing in boldface type apply over the entire junction temperature range for operation, −40 to +125˚C. (Notes 9, 10, 11)
Symbol
Nominal Output Voltage (VNOM)
Parameter
Conditions
12V
Typical
Limit
15V
Typical
Limit
Units
VOUT
Output Voltage
1 mA IOUT 100 mA
12.00
11.52
11.40
12.48
12.60
15.00
14.40
14.25
15.60
15.75
V
V(min)
V(min)
V(max)
V(max)
VOUT
VOUT
Line Regulation
Load Regulation
VNOM + 1.5V VIN 30V,
IOUT = 1 mA
10 mA IOUT 100 mA
14 16 mV
40 40 mV(max)
36 45 mV
60 75 mV(max)
IGND
Ground Pin
Current
VNOM + 1.5V VIN 30V,
No Load
VON/OFF = 5V
2
2 mA
4 4 mA(max)
VON/OFF = 0V 0.1 0.1 µA
5 5 µA(max)
VIN -
VOUT
Dropout Voltage IOUT = 10 mA
0.7 0.7
V
0.9 0.9 V(max)
1.0 1.0 V(max)
IOUT = 100 mA
0.9 0.9
V
1.1 1.1 V(max)
1.2 1.2 V(max)
en
Output Noise
VIN = 10V,
360
Voltage
Bandwidth: 10 Hz to 100 kHz
450 µVrms
VIL Maximum Low
Level Input
Voltage at
ON/OFF
0.2 0.2 V(max)
VIH Minimum High
Level Input
Voltage at
ON/OFF
IIL VON/OFF = 0V
IIH VON/OFF = 5V
2.0 2.0 V(min)
−1 −1 µA(max)
1 1 µA
20 20 µA(max)
Note 1: The package code MA05B is internal to National Semiconductor Corporation and indicates a specific version of the SOT-23 package and associated me-
chanical drawings.
Note 2: The suffix “I” indicates the junction temperature range for operation is the industrial temperature range, −40 to +125˚C. The suffix “M5” indicates the die is
packaged in the 5-lead SOT-23 package. The suffix “X” indicates the devices will be supplied in blocks of 3k units as opposed to blocks of 250 units.
Note 3: Because the entire part number does not fit on the SOT-23 package, the SOT-23 package is marked with this code instead of the part number.
Note 4: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device
is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical
Characteristics tables.
Note 5: The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using P = (TJ - TA)/θJA where TJ is the junction tem-
perature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance. The 400 mW rating results from substituting the Absolute Maximum
junction temperature, 150˚C, for TJ , 50˚C for TA, and 250˚C/W for θJA. More power can be safely dissipated at lower ambient temperatures. Less power can be safely
dissipated at higher ambient temperatures. The Absolute Maximum power dissipation can be increased by 4 mW for each ˚C below 50˚C ambient. It must be derated
by 4 mW for each ˚C above 50˚C ambient. A θJA of 250˚C/W represents the worst-case condition of no heat sinking of the 5-lead plastic SOT-23 package. Heat sink-
ing enables the safe dissipation of more power. The LM3490 actively limits its junction temperature to about 150˚C.
Note 6: Times shown are dwell times. Temperatures shown are dwell temperatures. For detailed information on soldering plastic small-outline packages, refer to the
Packaging Databook available from National Semiconductor Corporation.
Note 7: For testing purposes, ESD was applied using the human-body model, a 100 pF capacitor discharged through a 1.5 kresistor.
Note 8: As with the Absolute Maximum power dissipation, the maximum power dissipation for operation depends on the ambient temperature. The 300 mW rating
appearing under Operating Ratings results from substituting the maximum junction temperature for operation, 125˚C, for TJ, 50˚C for TA, and 250˚C/W for θJA in
P = (TJ − TA)/θJA. More power can be dissipated at lower ambient temperatures. Less power can be dissipated at higher ambient temperatures. The maximum power
dissipation for operation appearing under Operating Ratings can be increased by 4 mW for each ˚C below 50˚C ambient. It must be derated by 4 mW for each ˚C
above 50˚C ambient. A θJA of 250˚C/W represents the worst-case condition of no heat sinking of the 5-lead plastic SOT-23 package. Heat sinking enables the dis-
sipation of more power during operation.
www.national.com
4
Page 4
Part Number LM349
Manufactur National Semiconductor
Description Quad 741 Op Amps LM149 Wide Band Decompensated (AV MIN = 5)
Total Page 10 Pages
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