NSC LM3411N-5.0, LM3411N-3.3 Datasheet

LM3411
Precision Secondary Regulator/Driver

General Description

The LM3411isalowpowerfixed-voltage(3.3Vor5.0V)pre­cision shunt regulator designed specifically fordrivinganop­toisolator 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

n Fixed voltages of 3.3V and 5.0V with initial tolerance of

±

1% for standard grade and±0.5% for A grade

n Custom voltages available (3V–17V)
n Wide output current range, 20 µA–15 mA
n Low temperature coefficient
n Available in 5-lead SOT23-5 surface mount package

(tape and reel)

Applications

n Secondary controller for isolated DC/DC PWM switching

regulators systems

n Use with LDO regulator for high-precision fixed output

regulators

n Precision monitoring applications
n Use with many types of regulators to increase precision

and improve performance

Typical Application and Functional Diagram

SIMPLE SWITCHER™is a tradmark of National Semiconductor Corporation.

DS011987-1

Basic Isolated DC/DC Converter

DS011987-2

LM3411 Functional Diagram

July 2000

LM3411 Precision Secondary Regulator/Driver

© 2000 National Semiconductor Corporation DS011987 www.national.com

Connection Diagrams and Order Information

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.

The first letter “D” identifies the part as a Driver, the next two numbers indicate the voltage, “00” for 3.3V part and “01” for a 5V
part. The fourth letter indicates the grade, “B” for standard grade, “A” 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 “M5” in the part number), or in quantities increments of 3000 on tape and reel (indicated by the letters “M5X” in the part
number).

5-Lead Small Outline Package (M5)

DS011987-3

*No internal connection, but should be soldered to PC board for best heat
transfer.

Top View

Actual Size

DS011987-4

For Ordering Information

See

Figure 1

in this Data Sheet

See NS Package Number MF05A

Grade

Order Information Package

Marking

Supplied as

3.3V A (Prime) LM3411AM5-3.3 D00A 1000 unit increments on tape and reel

3.3V A (Prime) LM3411AM5X-3.3 D00A 3000 unit increments on tape and reel

3.3V B (Standard) LM3411M5-3.3 D00B 1000 unit increments on tape and reel

3.3V B (Standard) LM3411M5X-3.3 D00B 3000 unit increments on tape and reel

5.0V A (Prime) LM3411AM5-5.0 D01A 1000 unit increments on tape and reel

5.0V A (Prime) LM3411AM5X-5.0 D01A 3000 unit increments on tape and reel

5.0V B (Standard) LM3411M5-5.0 D01B 1000 unit increments on tape and reel

5.0V B (Standard) LM3411M5X-5.0 D01B 3000 unit increments on tape and reel

FIGURE 1. SOT23-5 Marking and Order Information

LM3411

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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 150˚C
Storage Temperature −65˚C to +150˚C
Lead Temperature

Vapor Phase (60 sec.) +215˚C
Infrared (15 sec.) +220˚C

Power Dissipation (T

A

= 25˚C) (Note

2) 300 mW

ESD Susceptibility (Note 3)

Human Body Model 1500V

See AN-450 “Surface Mounting Methods and Their Effect on
Product Reliability” for methods on soldering surface-mount
devices.

Operating Ratings (Notes 1, 2)

Ambient Temperature Range −40˚C ≤ T

A

≤ +85˚C

Junction Temperature Range −40˚C ≤ T

J

≤ +125˚C

Output Current 15 mA

LM3411-3.3 Electrical Characteristics

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) = V

REG,VOUT

= 1.5V.

Symbol Parameter Conditions Typical LM3411A-3.3 LM3411-3.3 Units

(Note 4) Limit Limit (Limits)

(Note 5) (Note 5)

V

REG

Regulation Voltage I

OUT

= 5 mA 3.3 V

3.317/3.333 3.333/3.366 V(max)

3.284/3.267 3.267/3.234 V(min)

Regulation Voltage I

OUT

=5mA

±

0.5/±1

±1/±

2 %(max)

Tolerance

I

q

Quiescent Current I

OUT

= 5 mA 85 µA

110/115 125/150 µA(max)

G

m

Transconductance 20 µA ≤ I

OUT

≤ 1 mA 3.3 mA/mV

∆I

OUT

/∆V

REG

1.5/0.75 1/0.50 mA/mV(min)

1mA≤I

OUT

≤ 15 mA 6.0 mA/mV

3.3/2.0 2.5/1.7 mA/mV(min)

A

V

Voltage Gain 1V ≤ V

OUT

≤ V

REG

− 1.2V (−1.3) 1000 V/V

∆V

OUT

/∆V

REG

RL= 140Ω (Note 6) 550/250 450/200 V/V(min)
1V ≤ V

OUT

≤ V

REG

− 1.2V (−1.3) 3500 V/V

R

L

=2kΩ 1500/900 1000/700 V/V(min)

V

SAT

Output Saturation V(IN) = V

REG

+100 mV 1.0 V

(Note 7) I

OUT

= 15 mA 1.2/1.3 1.2/1.3 V(max)

I

L

Output Leakage V(IN) = V

REG

−100 mV 0.1 µA

Current V

OUT

= 0V 0.5/1.0 0.5/1.0 µA(max)

R

f

Internal Feedback 52 kΩ
Resistor (Note 8) 65 65 kΩ(max)

39 39 kΩ(min)

E

n

Output Noise I

OUT

= 1 mA, 10 Hz ≤ f ≤ 10 kHz 50 µV

RMS

Voltage

LM3411

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LM3411-5.0 Electrical Characteristics

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) = V

REG,VOUT

= 1.5V.

Symbol Parameter Conditions Typical LM3411A-5.0 LM3411-5.0 Units

(Note 4) Limit Limit (Limits)

(Note 5) (Note 5)

V

REG

Regulation Voltage I

OUT

=5mA 5 V

5.025/5.050 5.050/5.100 V(max)

4.975/4.950 4.950/4.900 V(min)

Regulation Voltage I

OUT

=5mA

±

0.5/±1

±1/±

2 %(max)

Tolerance

I

q

Quiescent Current I

OUT

= 5 mA 85 µA

110/115 125/150 µA(max)

G

m

Transconductance 20 µA ≤ I

OUT

≤ 1 mA 3.3 mA/mV

∆I

OUT

/∆V

REG

1.5/0.75 1.0/0.5 mA/mV(min)

1mA≤I

OUT

≤ 15 mA 6.0 mA/mV

3.3/2.0 2.5/1.7 mA/mV(min)

A

V

Voltage Gain 1V ≤ V

OUT

≤ V

REG

− 1.2V (−1.3) 1000 V/V

∆V

OUT

/∆V

REG

RL= 250Ω (Note 6) 750/350 650/300 V/V(min)
1V ≤ V

OUT

≤ V

REG

− 1.2V (−1.3) 3500 V/V

R

L

=2kΩ 1500/900 1000/700 V/V(min)

V

SAT

Output Saturation V(IN) = V

REG

+100 mV 1.0 V

(Note 7) I

OUT

= 15 mA 1.2/1.3 1.2/1.3 V(max)

I

L

Output Leakage V(IN) = V

REG

−100 mV 0.1 µA

Current V

OUT

= 0V 0.5/1.0 0.5/1.0 µA(max)

R

f

Internal Feedback 94 kΩ
Resistor (Note 8) 118 118 kΩ(max)

70 70 kΩ(min)

E

n

Output Noise I

OUT

= 1 mA, 10 Hz ≤ f ≤ 10 kHz 80 µV

RMS

Voltage

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 T

Jmax

(maximum junction temperature), θJA(junction to am-

bient thermal resistance), and T

A

(ambient temperature). The maximum allowable power dissipation at any temperature is (P

Dmax=TJmax−TA

)/θJAor the number

given in the Absolute Maximum Ratings, whichever is lower. The typical thermal resistance (θ

JA

) when soldered to a printed circuit board is approximately 306˚C/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 25˚C and represent the most likely parametric norm.
Note 5: Limits are 100% production tested at 25˚C. 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: V

SAT

= V(IN) − V

OUT

, when the voltage at the IN pin is forced 100 mV above the nominal regulating voltage (V

REG

).

Note 8: See Applications and Curves sections for information on this resistor.

LM3411

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