NSC LM3411AM5-5.0, LM3411AM5-3.3, LM3411M5X-5.0, LM3411M5X-3.3, LM3411AM5X-5.0 Datasheet
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December 1999
LM3411
Precision Secondary Regulator/Driver
General Description
The LM3411 is a low power fixed-voltage (3.3V or 5.0V) precision shunt regulator designed specifically for driving an optoisolator to provide feedback isolation in a switching regulator.
The LM3411 circuitry includes an internally compensated op amp, a bandgap reference, NPN output transistor, and voltage setting resistors.
A trimmed precision bandgap reference with temperature drift curvature correction, provides a guaranteed 1% precision over the operating temperature range (A grade version). The amplifier's inverting input is externally accessible for loop frequency compensation when used as part of a larger servo system. The output is an open-emitter NPN transistor capable of driving up to 15 mA of load current.
Because of its small die size, the LM3411 has been made available in the sub-miniature 5-lead SOT23-5 surface mount package. This package is ideal for use in space critical applications.
Although its main application is to provide a precision output voltage (no trimming required) and maintain very good regulation in isolated DC/DC converters, it can also be used with
other types of voltage regulators or power semiconductors to provide a precision output voltage without precision resistors or trimming.
Features
nFixed voltages of 3.3V and 5.0V with initial tolerance of
±1% for standard grade and ±0.5% for A grade
nCustom voltages available (3V±17V)
nWide output current range, 20 µA±15 mA
nLow temperature coefficient
nAvailable in 5-lead SOT23-5 surface mount package (tape and reel)
Applications
nSecondary controller for isolated DC/DC PWM switching regulators systems
nUse with LDO regulator for high-precision fixed output regulators
nPrecision monitoring applications
nUse with many types of regulators to increase precision and improve performance
Typical Application and Functional Diagram
DS011987-1
Basic Isolated DC/DC Converter
DS011987-2
LM3411 Functional Diagram
SIMPLE SWITCHER™ is a tradmark of National Semiconductor Corporation.
Regulator/Driver Secondary Precision LM3411
© 1999 National Semiconductor Corporation |
DS011987 |
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LM3411
Connection Diagrams and Order Information
5-Lead Small Outline Package (M5)
Actual Size
DS011987-4
DS011987-3
*No internal connection, but should be soldered to PC board for best heat transfer.
Top View
For Ordering Information
See Figure 1 in this Data Sheet
See NS Package Number MA05B
Five Lead Surface Mount Package Marking
and Order Information (SOT23-5)
The small SOT23-5 package allows only 4 alphanumeric characters to identify the product. The table below contains the field information marked on the package.
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Grade |
Order Information |
Package |
Supplied as |
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Marking |
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3.3V |
A (Prime) |
LM3411AM5-3.3 |
D00A |
1000 unit increments on tape and reel |
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3.3V |
A (Prime) |
LM3411AM5X-3.3 |
D00A |
3000 unit increments on tape and reel |
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3.3V |
B (Standard) |
LM3411M5-3.3 |
D00B |
1000 unit increments on tape and reel |
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3.3V |
B (Standard) |
LM3411M5X-3.3 |
D00B |
3000 unit increments on tape and reel |
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5.0V |
A (Prime) |
LM3411AM5-5.0 |
D01A |
1000 unit increments on tape and reel |
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5.0V |
A (Prime) |
LM3411AM5X-5.0 |
D01A |
3000 unit increments on tape and reel |
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5.0V |
B (Standard) |
LM3411M5-5.0 |
D01B |
1000 unit increments on tape and reel |
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5.0V |
B (Standard) |
LM3411M5X-5.0 |
D01B |
3000 unit increments on tape and reel |
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FIGURE 1. SOT23-5 Marking and Order Information
The first letter ªDº identifies the part as a Driver, the next two numbers indicate the voltage, ª00º for 3.3V part and ª01º for a 5V part. The fourth letter indicates the grade, ªBº for standard grade, ªAº for the prime grade.
The SOT23-5 surface mount package is only available on tape in quantities increments of 250 on tape and reel (indicated by the letters ªM5º in the part number), or in quantities increments of 3000 on tape and reel (indicated by the letters ªM5Xº in the part number).
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2 |
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Input Voltage V(IN) |
20V |
Output Current |
20 mA |
Junction Temperature |
150ÊC |
Storage Temperature |
−65ÊC to +150ÊC |
Lead Temperature |
|
Vapor Phase (60 sec.) |
+215ÊC |
Infrared (15 sec.) |
+220ÊC |
Power Dissipation (TA = 25ÊC) (Note |
300 mW |
2) |
ESD Susceptibility (Note 3) |
|
Human Body Model |
1500V |
See AN-450 ªSurface Mounting Methods and Their Effect on Product Reliabilityº for methods on soldering surface-mount devices.
Operating Ratings (Notes 1, 2)
Ambient Temperature Range |
−40ÊC |
≤ TA ≤ +85ÊC |
Junction Temperature Range |
−40ÊC |
≤ TJ ≤ +125ÊC |
Output Current |
|
15 mA |
LM3411-3.3 Electrical Characteristics
Specifications with standard type face are for TJ = 25ÊC, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, V(IN) = VREG, VOUT = 1.5V.
Symbol |
Parameter |
Conditions |
Typical |
LM3411A-3.3 |
LM3411-3.3 |
Units |
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(Note 4) |
Limit |
Limit |
(Limits) |
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(Note 5) |
(Note 5) |
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VREG |
Regulation Voltage |
IOUT = 5 mA |
3.3 |
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V |
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3.317/3.333 |
3.333/3.366 |
V(max) |
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3.284/3.267 |
3.267/3.234 |
V(min) |
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Regulation Voltage |
IOUT = 5 mA |
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±0.5/± 1 |
±1/± 2 |
%(max) |
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Tolerance |
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Iq |
Quiescent Current |
IOUT = 5 mA |
85 |
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µA |
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110/115 |
125/150 |
µA(max) |
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Gm |
Transconductance |
20 µA ≤ IOUT ≤ 1 mA |
3.3 |
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mA/mV |
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IOUT/ VREG |
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1.5/0.75 |
1/0.50 |
mA/mV(min) |
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1 mA ≤ IOUT ≤ 15 mA |
6.0 |
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mA/mV |
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3.3/2.0 |
2.5/1.7 |
mA/mV(min) |
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AV |
Voltage Gain |
1V ≤ VOUT ≤ VREG − 1.2V (−1.3) |
1000 |
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V/V |
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VOUT/ VREG |
RL = 140Ω (Note 6) |
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550/250 |
450/200 |
V/V(min) |
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1V ≤ VOUT ≤ VREG − 1.2V (−1.3) |
3500 |
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V/V |
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RL = 2 kΩ |
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1500/900 |
1000/700 |
V/V(min) |
VSAT |
Output Saturation |
V(IN) = VREG +100 mV |
1.0 |
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V |
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(Note 7) |
IOUT = 15 mA |
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1.2/1.3 |
1.2/1.3 |
V(max) |
IL |
Output Leakage |
V(IN) = VREG −100 mV |
0.1 |
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µA |
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Current |
VOUT = 0V |
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0.5/1.0 |
0.5/1.0 |
µA(max) |
Rf |
Internal Feedback |
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52 |
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kΩ |
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Resistor (Note 8) |
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65 |
65 |
kΩ(max) |
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39 |
39 |
kΩ(min) |
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En |
Output Noise |
IOUT = 1 mA, 10 Hz ≤ f ≤ 10 kHz |
50 |
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µVRMS |
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Voltage |
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LM3411
3 |
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LM3411
LM3411-5.0 Electrical Characteristics
Specifications with standard type face are for TJ = 25ÊC, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, V(IN) = VREG, VOUT = 1.5V.
Symbol |
Parameter |
Conditions |
Typical |
LM3411A-5.0 |
LM3411-5.0 |
Units |
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(Note 4) |
Limit |
Limit |
(Limits) |
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(Note 5) |
(Note 5) |
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VREG |
Regulation Voltage |
IOUT = 5 mA |
5 |
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V |
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5.025/5.050 |
5.050/5.100 |
V(max) |
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4.975/4.950 |
4.950/4.900 |
V(min) |
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Regulation Voltage |
IOUT = 5 mA |
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±0.5/± 1 |
±1/± 2 |
%(max) |
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Tolerance |
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Iq |
Quiescent Current |
IOUT = 5 mA |
85 |
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µA |
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110/115 |
125/150 |
µA(max) |
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Gm |
Transconductance |
20 µA ≤ IOUT ≤ 1 mA |
3.3 |
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mA/mV |
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IOUT/ VREG |
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1.5/0.75 |
1.0/0.5 |
mA/mV(min) |
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1 mA ≤ IOUT ≤ 15 mA |
6.0 |
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mA/mV |
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3.3/2.0 |
2.5/1.7 |
mA/mV(min) |
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AV |
Voltage Gain |
1V ≤ VOUT ≤ VREG − 1.2V (−1.3) |
1000 |
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V/V |
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VOUT/ VREG |
RL = 250Ω (Note 6) |
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750/350 |
650/300 |
V/V(min) |
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1V ≤ VOUT ≤ VREG − 1.2V (−1.3) |
3500 |
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V/V |
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RL = 2 kΩ |
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1500/900 |
1000/700 |
V/V(min) |
VSAT |
Output Saturation |
V(IN) = VREG +100 mV |
1.0 |
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V |
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(Note 7) |
IOUT = 15 mA |
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1.2/1.3 |
1.2/1.3 |
V(max) |
IL |
Output Leakage |
V(IN) = VREG −100 mV |
0.1 |
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µA |
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Current |
VOUT = 0V |
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0.5/1.0 |
0.5/1.0 |
µA(max) |
Rf |
Internal Feedback |
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94 |
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kΩ |
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Resistor (Note 8) |
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118 |
118 |
kΩ(max) |
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70 |
70 |
kΩ(min) |
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En |
Output Noise |
IOUT = 1 mA, 10 Hz ≤ f ≤ 10 kHz |
80 |
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µVRMS |
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Voltage |
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Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions.
Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is (PDmax = TJmax − T A)/θJA or the number given in the Absolute Maximum Ratings, whichever is lower. The typical thermal resistance (θJA) when soldered to a printed circuit board is approximately 306ÊC/W for the M5 package.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Note 4: Typical numbers are at 25ÊC and represent the most likely parametric norm.
Note 5: Limits are 100% production tested at 25ÊC. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate National's Averaging Outgoing Level (AOQL).
Note 6: Actual test is done using equivalent current sink instead of a resistor load.
Note 7: VSAT = V(IN) − V OUT, when the voltage at the IN pin is forced 100 mV above the nominal regulating voltage (VREG).
Note 8: See Applications and Curves sections for information on this resistor.
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