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LM3411

www.ti.com

SNVS113E –DECEMBER 1999–REVISED APRIL 2013

LM3411 Precision Secondary Regulator/Driver

Check for Samples: LM3411

FEATURES

DESCRIPTION

The LM3411 is a low power fixed-voltage (3.3V or

• Fixed Voltages of 3.3V and 5.0V with Initial

5.0V) precision shunt regulator designed specifically

Tolerance of ±1% for Standard Grade and

for driving an optoisolator to provide feedback

±0.5% for A Grade

isolation in a switching regulator.

• Custom Voltages Available (3V–17V)

The LM3411 circuitry includes an internally

• Wide Output Current Range, 20 μA–15 mA

compensated op amp, a bandgap reference, NPN

• Low Temperature Coefficient

output transistor, and voltage setting resistors.

• Available in 5-Lead SOT23-5 Surface Mount

A trimmed precision bandgap reference with

Package (Tape and Reel)

temperature drift curvature correction, provides a

ensured 1% precision over the operating temperature

APPLICATIONS

range (A grade version). The amplifier's inverting

input is externally accessible for loop frequency

• Secondary Controller for Isolated DC/DC PWM

compensation when used as part of a larger servo

Switching Regulators Systems

system. The output is an open-emitter NPN transistor

• Use with LDO Regulator for High-Precision

capable of driving up to 15 mA of load current.

Fixed Output Regulators

Because of its small die size, the LM3411 has been

• Precision Monitoring Applications

made available in the sub-miniature 5-lead SOT23-5

• Use with many Types of Regulators to

surface mount package. This package is ideal for use

Increase Precision and Improve Performance

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.

Typical Application and Functional Diagram

Figure 1. Basic Isolated DC/DC Converter

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (24 pages)

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LM3411 www.ti.com SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 LM3411 Precision Secondary Regulator/Driver Check for Samples: LM3411 FEATURES 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. 1 2 • • • • Fixed Voltages of 3.3V and 5.0V with Initial Tolerance of ±1% for Standard Grade and ±0.
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LM3411 SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 www.ti.com Figure 2. LM3411 Functional Diagram Connection Diagrams *No internal connection, but should be soldered to PC board for best heat transfer. Figure 3. 5-Lead SOT23-5 (DBV) Small Outline Package (M5) Package Number DBV0005A Top View 2 Submit Documentation Feedback Figure 4.
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LM3411 www.ti.com SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) (2) Input Voltage V(IN) 20V Output Current 20 mA Junction Temperature 150°C Storage Temperature −65°C to +150°C Lead Temperature Vapor Phase (60 sec.) +215°C Infrared (15 sec.
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LM3411 SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 www.ti.com LM3411-3.3 Electrical Characteristics (continued) Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, V(IN) = VREG, VOUT = 1.5V. Symbol Parameter Conditions Typical (1) LM3411A-3.3 LM3411-3.3 Units Limit Limit (Limits) (2) Iq Quiescent Current IOUT = 5 mA μA 85 110/115 Gm Transconductance 20 μA ≤ IOUT ≤ 1 mA 3.
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LM3411 www.ti.com SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 LM3411-5.0 Electrical Characteristics (continued) Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, V(IN) = VREG, VOUT = 1.5V. Symbol Parameter Conditions Typical (1) LM3411A-5.0 LM3411-5.0 Units Limit Limit (Limits) (2) AV Voltage Gain 1V ≤ VOUT ≤ VREG − 1.2V (−1.
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LM3411 SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics 6 Normalized Temperature Drift Quiescent Current Figure 5. Figure 6. Output Saturation Voltage (V)SAT Circuit Used for Bode Plots Figure 7. Figure 8. Bode Plot Bode Plot Figure 9. Figure 10.
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LM3411 www.ti.com SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Bode Plot Response Time for 3.3V Version (CC = 0 pF) Figure 11. Figure 12. Response Time for 3.3V Version (CC = 10 nF) Circuit Used for Response Time Figure 13. Figure 14. Response Time for 5V Version (CC = 0 pF) Response Time for 5V Version (CC = 10 nF) Figure 15. Figure 16.
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LM3411 SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 8 Tempco of Internal Feedback Resistor (Rf) Regulation Voltage Change vs Output Current Figure 17. Figure 18. Regulation Voltage vs Output Voltage and Load Resistance Regulation Voltage vs Output Voltage and Load Resistance Figure 19. Figure 20.
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LM3411 www.ti.com SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 PRODUCT DESCRIPTION The LM3411 is a shunt regulator specifically designed to be the reference and control section in an overall feedback loop of a regulated power supply. The regulated output voltage is sensed between the IN pin and GROUND pin of the LM3411. If the voltage at the IN pin is less than the LM3411 regulating voltage (VREG), the OUT pin sources no current.
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LM3411 SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 www.ti.com Figure 21. LM3411 Test Circuit Applications Information Figure 22.
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LM3411 www.ti.com SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 Figure 23. Isolated 1.5A Flyback Switching Regulator Using a LM2577 The LM3411 regulator/driver provides the reference and feedback drive functions in a regulated power supply. It can also be used together with many different types of regulators, (both linear and switching) as well as other power semiconductor devices to add precision and improve regulation specifications. Output voltage tolerances better than 0.
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LM3411 SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 www.ti.com Figure 25. Negative Input, Negative or Positive Output Flyback Regulator Improved output voltage tolerance and regulation specifications are possible by combining the LM3411A with one of the SIMPLE SWITCHER buck regulator IC's, such as the LM2574, LM2575, or LM2576. The circuit shown in Figure 24 can provide a 5V, ±0.5% Output (1% over the operating temperature range) without using any trimpots or precision resistors.
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LM3411 www.ti.com SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 Figure 27. 3.3V 0.5A Low Dropout Regulator The circuit in Figure 27 shows a 3.3V low dropout regulator using the LM3411-3.3 and several discrete components. This circuit is capable of excellent performance with both the dropout voltage and the ground pin current specifications improved over the LM2941/LM3411 circuit. The standard LM317 three terminal adjustable regulator circuit can greatly benefit by adding a LM3411.
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LM3411 SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 www.ti.com Figure 29. Precision Negative Voltage Regulator Figure 30. Precision Negative Voltage Regulator with Accurate Current Limit A simple 5V supply monitor circuit is shown in Figure 31. Using the LM3411's voltage reference, op-amp (as a comparator) and output driver, this circuit provides a LED indication of the presence of the 5V supply. Figure 31. 4.
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LM3411 www.ti.com SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 Figure 33. 250 mA Shunt Regulator Perhaps one of the simplest applications for the LM3411 is the voltage detector circuit shown in Figure 34 . The OUT pin is low when the input voltage is less than VREG. When the V(IN) pin rises above VREG, the OUT pin is pulled high by the internal NPN output resistor. Figure 34.
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LM3411 SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 www.ti.
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LM3411 www.ti.com SNVS113E – DECEMBER 1999 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision D (April 2013) to Revision E • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 PACKAGING INFORMATION Orderable Device Status (1) LM3411AM5-3.3/NOPB Package Type Package Pins Package Drawing Qty ACTIVE SOT-23 DBV 5 1000 Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 D00A (4/5) LM3411AM5-5.0 NRND SOT-23 DBV 5 1000 TBD Call TI Call TI -40 to 85 D01A LM3411AM5-5.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) LM3411AM5-3.3/NOPB SOT-23 DBV 5 1000 178.0 8.4 LM3411AM5-5.0 SOT-23 DBV 5 1000 178.0 LM3411AM5-5.0/NOPB SOT-23 DBV 5 1000 178.0 LM3411AM5X-3.3/NOPB SOT-23 DBV 5 3000 LM3411AM5X-5.0/NOPB SOT-23 DBV 5 W Pin1 (mm) Quadrant 3.2 3.2 1.4 4.0 8.0 Q3 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM3411AM5-3.3/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM3411AM5-5.0 SOT-23 DBV 5 1000 210.0 185.0 35.0 LM3411AM5-5.0/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM3411AM5X-3.3/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LM3411AM5X-5.0/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LM3411M5-3.
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