LM3490
LM3490 100 mA, SOT-23, Quasi Low-Dropout Linear Voltage Regulator with
Logic-Controlled ON/ OFF
Literature Number: SNVS012D
June 2007
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.
Standard 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 need-
ed.
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
devices 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
■30V maximum input for operation
■1.2V guaranteed maximum dropout over full load and
temperature ranges
■100 mA guaranteed load current
■±5% guaranteed output voltage tolerance over full load
and temperature ranges
■−40 to +125°C junction temperature range for operation
Features
■3.3, 5, 12, and 15V versions available
■Logic-controlled ON/OFF
■Packaged in the tiny 5-lead SOT-23 package
Applications
■Tiny alternative to LM78LXX series and similar devices
■Tiny 5V±5% to 3.3V, 100 mA converter
■Post regulator for switching DC/DC converter
■Bias supply for analog circuits
Typical Application Circuit
10007102
Connection Diagram
10007101
Top View
SOT-23 Package
5-Lead, Molded-Plastic Small-Outline Transistor (SOT) Package
Package Code MF05A(Note 1)
© 2007 National Semiconductor Corporation 100071 www.national.com
LM3490 100 mA, SOT-23, Quasi Low-Dropout Linear Voltage Regulator with Logic-Controlled
ON/OFF
Ordering Information
Output
Voltage
(V)
Order
Number
(Note 2)
Package
Marking
(Note 3)
Comments
3.3 LM3490IM5-3.3 L78B 1000 Units on Tape and Reel
LM3490IM5X-3.3 L78B 3000 Units on Tape and Reel
5.0 LM3490IM5-5.0 L79B 1000 Units on Tape and Reel
LM3490IM5X-5.0 L79B 3000 Units on Tape and Reel
12 LM3490IM5-12 L80B 1000 Units on Tape and Reel
LM3490IM5X-12 L80B 3000 Units on Tape and Reel
15 LM3490IM5-15 L81B 1000 Units on Tape and Reel
LM3490IM5X-15 L81B 3000 Units on Tape and Reel
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LM3490
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) 35V
Voltage ON/OFF to GND 5.5V
Power Dissipation (Note 5) 400 mW
Junction Temp. (TJ) (Note 5) +150°C
Ambient Storage Temp. −65 to +150°C
Soldering Time, Temp. (Note 6)
Wave
Infrared
Vapor Phase
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) 30V
Voltage ON/OFF to GND 0 to 5V
Junction Temperature (TJ) −40 to +125°C
Maximum Power Dissipation (Note 8) 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 appearing
in boldface type apply over the entire junction temperature range for operation, −40 to +125°C. (Notes 9, 10, 11)
Nominal Output Voltage (VNOM)3.3V 5.0V Units
Symbol Parameter Conditions Typical Limit Typical Limit
VOUT Output Voltage 1 mA ≤ IOUT ≤ 100 mA 3.30
3.17
3.14
3.43
3.46
5.00
4.80
4.75
5.20
5.25
V
V(min)
V(min)
V(max)
V(max)
ΔVOUT Line Regulation VNOM + 1.5V ≤ VIN ≤ 30V,
IOUT = 1 mA
7
25
9
25
mV
mV(max)
ΔVOUT Load Regulation 10 mA ≤ IOUT ≤ 100 mA 15
40
15
40
mV
mV(max)
IGND Ground Pin Current VNOM + 1.5V ≤ VIN ≤ 30V,
No Load
VON/OFF = 5V 2 2 mA
4 4mA(max)
VON/OFF = 0V 0.1 0.1 µA
5 5µA(max)
VIN -
VOUT
Dropout Voltage IOUT = 10 mA 0.7
0.9
1.0
0.7
0.9
1.0
V
V(max)
V(max)
IOUT = 100 mA 0.9
1.1
1.2
0.9
1.1
1.2
V
V(max)
V(max)
enOutput Noise
Voltage
VIN = 10V,
Bandwidth: 10 Hz to 100 kHz
100 150 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
2.0 2.0 V(min)
IIL VON/OFF = 0V −1 −1 µA(max)
IIH VON/OFF = 5V 1 1 µA
20 20 µA(max)
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LM3490
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 appearing
in boldface type apply over the entire junction temperature range for operation, −40 to +125°C. (Notes 9, 10, 11)
Nominal Output Voltage (VNOM)12V 15V Units
Symbol Parameter Conditions Typical Limit Typical Limit
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)
ΔVOUT Line Regulation VNOM + 1.5V ≤ VIN ≤ 30V,
IOUT = 1 mA
14
40
16
40
mV
mV(max)
ΔVOUT Load Regulation 10 mA ≤ IOUT ≤ 100 mA 36
60
45
75
mV
mV(max)
IGND Ground Pin Current VNOM + 1.5V ≤ VIN ≤ 30V,
No Load
VON/OFF = 5V 2 2 mA
4 4mA(max)
VON/OFF = 0V 0.1 0.1 µA
5 5µA(max)
VIN -
VOUT
Dropout Voltage IOUT = 10 mA 0.7
0.9
1.0
0.7
0.9
1.0
V
V(max)
V(max)
IOUT = 100 mA 0.9
1.1
1.2
0.9
1.1
1.2
V
V(max)
V(max)
enOutput Noise
Voltage
VIN = 10V,
Bandwidth: 10 Hz to 100 kHz
360 450 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
2.0 2.0 V(min)
IIL VON/OFF = 0V −1 −1 µA(max)
IIH VON/OFF = 5V 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
mechanical 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
temperature, 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 sinking 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 kΩ resistor.
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
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LM3490
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 dissipation of more power during operation.
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
limits 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.
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LM3490
Typical Performance Characteristics Unless indicated otherwise, VIN = VNOM + 1.5V, CIN = 0.1 µF,
COUT = 0.1 µF, and TA .=25°C.
Dropout Voltage
vs Load Current
10007119
Dropout Voltage
vs Junction Temperature
10007120
Ground Pin Current
vs Input Voltage
10007109
Ground Pin Current
vs Input Voltage
10007110
Ground Pin Current
vs Load Current
10007121
Ground Pin Current
vs Junction Temperature
10007122
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LM3490
Input Current
vs Input Voltage
10007111
Input Current
vs Input Voltage
10007112
Line Transient Response
10007103
Line Transient Response
10007104
Load Transient Response
10007105
Load Transient Response
10007106
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LM3490
Load Transient Response
10007107
Load Transient Response
10007108
Output Voltage
vs Input Voltage
10007113
Output Voltage
vs Input Voltage
10007114
Output Voltage
vs Input Voltage
10007115
Output Voltage
vs Input Voltage
10007116
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LM3490
Output Short-
Circuit Current
10007117
Output Short-
Circuit Current
10007118
Power Supply
Rejection Ratio
10007124
Power Supply
Rejection Ratio
10007125
DC Load
Regulation
10007123
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LM3490
Applications Information
ON/OFF Pin
The LM3490 features a logic controlled ON/OFF pin that will
allow the output voltage to be disabled, or enabled, as need-
ed. The defined operating voltage range for this pin is 0.0V to
5.0V. The ON/OFF pin can not be left floating, as the output
status cannot be guaranteed. Additionally, the ON/OFF pin
should not be biased below ground potential as unpredictable
device behavior may occur.
Pulling the ON/OFF pin voltage to a value between the VIH
threshold and 5.0V will enable the output voltage. Pulling the
ON/OFF pin voltage to a value between the VIL threshold and
Ground potential will disable the output voltage. Although the
ON/OFF threshold is typically 725mV, and has no hysteresis,
the ON/OFF signal must rise and fall, cleanly and promptly,
from voltage levels that are below the VIL threshold and above
the VIH threshold.
The ON/OFF pin has no internal pull-up or pull-down to es-
tablish a default condition and, as a result, this pin must be
terminated, either actively or passively, to an appropriate volt-
age level.
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LM3490
Physical Dimensions inches (millimeters) unless otherwise noted
SOT-23 Package
5-Lead Small-Outline Package (M5)
For Ordering, Refer to Ordering Information Table
NS Package Number MF05A
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LM3490
Notes
LM3490 100 mA, SOT-23, Quasi Low-Dropout Linear Voltage Regulator with Logic-Controlled
ON/OFF
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