Datasheet LMV431IZ, LMV431IM5X, LMV431CZ, LMV431CM5X, LMV431CM5 Datasheet (NSC)

LMV431/LMV431A
Low-Voltage (1.24V) Adjustable Precision Shunt
Regulators

LMV431/LMV431A Low-Voltage (1.24V) Adjustable Precision Shunt Regulators

January 2000

General Description

The LMV431and LMV431A are precision 1.24V shunt regu­lators capableof adjustment to 30V. Negative feedback from
the cathode to the adjust pin controls the cathode voltage,
much like a non-inverting op amp configuration (Refer to
Symbol and Functional diagrams). A two resistor voltage di­vider terminated atthe adjust pin controls the gain of a 1.24V
band-gap reference. Shorting the cathode to the adjust pin
(voltage follower) provides a cathode voltage of a 1.24V.

The LMV431 and LMV431A have respective initial toler­ances of 1.5%and 1%. Both grades are available in com­mercial and Industrial temperature ranges.

The LMV431 and LMV431A functionally lends themselves to
several applications that require zener diode type perfor­mance at low voltages. Applications include a 3V to 2.7V low
drop-out regulator, an error amplifier in a 3V off-line switch­ing regulator and even as a voltage detector. The part is typi­cally stable with capacitive loads greater than 10nF and less
than 50 pF.

The LMV431 and LMV431A provide performance at a com­petitive price.

Connection Diagrams

TO92: Plastic Package

Features

n Low Voltage Operation/Wide Adjust Range (1.24V/30V)
n 1%Initial Tolerance (LMV431A)
n Temperature Compensated for Industrial Temperature

Range (39 PPM/˚C for the LMV431AI)

n Low Operation Current (55µA)
n Low Output Impedance (0.25Ω)
n Fast Turn-On Response
n Low Cost

Applications

n Shunt Regulator
n Series Regulator
n Current Source or Sink
n Voltage Monitor
n Error Amplifier
n 3V Off-Line Switching Regulator
n Low Dropout N-Channel Series Regulator

SOT23-5

DS100958-1

Top View

© 2000 National Semiconductor Corporation DS100958 www.national.com

Top View

DS100958-44

Symbol and Functional Diagrams

LMV431/LMV431A

DS100958-59

Simplified Schematic

DS100958-60

Ordering Information

Package Temperature

Range

TO92 Industrial Range

−40˚C to +85˚C
Commerial Range

0˚C to +70˚C

SOT23-5 Industrial Range

−40˚C to +85˚C

Commercial Range
0˚C to +70˚C

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Voltage Tolerance Part Number Package Marking Drawing

%

1

%

1.5
%

1

%

1.5
%

1

%

1

%

1.5

%

1.5
%

1

%

1

%

1.5

%

1.5

LMV431AIZ LMV431AIZ

LMV431IZ LMV431IZ

LMV431ACZ LMV431ACZ

LMV431CZ LMV431CZ

LMV431AIM5 N08A

LMV431AIM5X N08A

LMV431IM5 N08B

LMV431IM5X N08B

LMV431ACM5 N09A

LMV431ACM5X N09A

LMV431CM5 N09B

LMV431CM5X N09B

DS100958-3

Number

Z03A

MA05A

DC/AC Test Circuits for Table and Curves

LMV431/LMV431A

DS100958-4

FIGURE 1. Test Circuit for V

=

V

Z

REF

Note: V

=

Z

(1 + R1/R2) + I

V

REF

FIGURE 2. Test Circuit for V

DS100958-6

FIGURE 3. Test Circuit for Off-State Current

REF

•

R1

DS100958-5

>

V

Z

REF

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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.

Storage Temperature Range −65˚C to +150˚C
Operating Temperature Range

LMV431/LMV431A

Industrial (LMV431AI, LMV431I) −40˚C to +85˚C
Commercial (LMV431AC, LMV431C) 0˚C to +70˚C

Lead Temperature

Operating Conditions

Cathode Voltage V
Cathode Current 0.1 mA to 15mA
Temperature range

LMV431AI −40˚C ≤ T

Thermal Resistance (θ

)(Note 3)

JA

SOT23-5 Package 455 ˚C/W
TO-92 Package 161 ˚C/W

Derating Curve (Slope=−1/θ

)

JA

REF

to 30V

TO92 Package/SOT23 -5Package

(Soldering, 10 sec.) 265˚C

Internal Power Dissipation (Note 2)

TO92

0.78W

SOT23-5 Package 0.28W
Cathode Voltage 35V
Continuous Cathode Current −30 mA to +30mA
Reference Input Current range −.05mA to 3mA

DS100958-30

LMV431C Electrical Characteristics

=

T

25˚C unless otherwise specified

A

Symbol Parameter Conditions Min Typ Max Units

V

REF

V

DEV

I

REF

∝

I

Z(MIN)

I

Z(OFF)

r

Z

I

Reference Voltage V

Deviation of Reference Input Voltage
Over Temperature (Note 4)

Ratio of the Change in Reference
Voltage to the Change in Cathode
Voltage

Reference Input Current R

Deviation of Reference Input Current

REF

over Temperature
Minimum Cathode Current for

Regulation
Off-State Current V
Dynamic Output Impedance (Note 5) V

=

V

Z

(See Figure 1 )

=

V

Z

=

Full Range

T

A

=

I

Z

VZfrom V

=

R

1

=

1

=

I

10mA

I

=

R

1

=

10mA, T

I

I

=

V

Z

=

6V, V

Z

=

Z

Frequency=0Hz

REF,IZ

V

REF,IZ

10mA

REF

10k, R
10kΩ,R

10kΩ,R

V

REF

REF

V

REF,IZ

(see Figure 2)

=

10mA

=

10mA,

(See Figure 1)

(see Figure 2 )

to 6V

=

∞

and 2.6K

2

=

∞

2

=

∞

,

2

=

Full Range

A

(see Figure 1)

=

(see Figure 3 )

0V

=

0.1mA to 15mA

(see Figure 1)

TA= 25˚C 1.222 1.24 1.258
T

= Full Range 1.21 1.27 V

A

412mV

−1.5 −2.7 mV/V

0.15 0.5 µA

(see Figure 2)

0.05 0.3 µA
55 80 µA

0.001 0.1 µA

0.25 0.4 Ω

≤ 85˚C

A

www.national.com 4

LMV431I Electrical Characteristics

=

T

25˚C unless otherwise specified

A

Symbol Parameter Conditions Min Typ Max Units

V

REF

V

DEV

I

REF

∝

I

Z(MIN)

I

Z(OFF)

r

Z

I

Reference Voltage V

Deviation of Reference Input Voltage
Over Temperature (Note 4)

Ratio of the Change in Reference
Voltage to the Change in Cathode
Voltage

Reference Input Current R

Deviation of Reference Input Current

REF

over Temperature
Minimum Cathode Current for

Regulation
Off-State Current V
Dynamic Output Impedance (Note 5) V

=

V

Z

(See Figure 1 )

=

V

Z

=

Full Range

T

A

=

I

Z

VZfrom V

=

R

1

=

1

=

I

10mA

I

=

R

1

=

10mA, T

I

I

=

V

Z

=

6V, V

Z

=

Z

Frequency=0Hz

REF,IZ

V

REF,IZ

10mA

REF

10k, R
10kΩ,R

(see Figure 2)

10kΩ,R

V

REF

REF

V

REF,IZ

=

10mA

=

10mA,

(See Figure 1)

(see Figure 2 )

to 6V

=

∞

and 2.6K

2

=

∞

2

=

∞

,

2

=

Full Range

A

(see Figure 1)

=

(see Figure 3 )

0V

=

0.1mA to 15mA

(see Figure 1)

TA= 25˚C 1.222 1.24 1.258

= Full Range 1.202 1.278

T

A

620mV

−1.5 −2.7 mV/V

0.15 0.5 µA

(see Figure 2)

0.1 0.4 µA

55 80 µA

0.001 0.1 µA

0.25 0.4 Ω

V

LMV431AC Electrical Characteristics

=

T

25˚C unless otherwise specified

A

Symbol Parameter Conditions Min Typ Max Units

V

REF

V

DEV

I

REF

∝

I

Z(MIN)

I

Z(OFF)

r

Z

I

Reference Voltage V

Deviation of Reference Input Voltage
Over Temperature (Note 4)

Ratio of the Change in Reference
Voltage to the Change in Cathode
Voltage

Reference Input Current R

Deviation of Reference Input Current

REF

over Temperature
Minimum Cathode Current for

Regulation
Off-State Current V
Dynamic Output Impedance (Note 5) V

=

V

Z

(See Figure 1 )

=

V

Z

=

Full Range

T

A

=

I

Z

VZfrom V

=

R

1

=

1

=

I

10 mA

I

=

R

1

=

10 mA, T

I

I

=

V

Z

=

6V, V

Z

=

Z

Frequency=0Hz

REF,IZ

V

REF,IZ

10 mA

REF

10k, R
10 kΩ,R

10 kΩ,R

(see Figure 1)

V

REF

REF

V

REF,IZ

=

10 mA

=

10mA,

(See Figure 1)

(see Figure 2 )

to 6V

=

∞

and 2.6K

2

=

∞

2

(see Figure 2)

=

∞

,

2

=

Full Range

A

=

(see Figure 3 )

0V

=

0.1mA to 15mA

(see Figure 1)

TA= 25˚C 1.228 1.24 1.252

= Full Range 1.221 1.259

T

A

412mV

−1.5 −2.7 mV/V

0.15 0.50 µA

(see Figure 2)

0.05 0.3 µA

55 80 µA

0.001 0.1 µA

0.25 0.4 Ω

V

LMV431/LMV431A

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LMV431AI Electrical Characteristics

=

T

25˚C unless otherwise specified

A

Symbol Parameter Conditions Min Typ Max Units

V

REF

Reference Voltage V

=

V

Z

(See Figure 1 )

V

DEV

LMV431/LMV431A

Deviation of Reference Input Voltage
Over Temperature (Note 4)

Ratio of the Change in Reference
Voltage to the Change in Cathode
Voltage

I

∝

REF

I

REF

Reference Input Current R

Deviation of Reference Input Current
over Temperature

I

Z(MIN)

Minimum Cathode Current for

=

V

Z

=

Full Range

T

A

=

I

Z

VZfrom V

=

R

1

=

1

=

I

10mA

I

=

R

1

=

10mA, T

I

I

=

V

Z

Regulation

I

Z(OFF)

r

Z

Off-State Current V
Dynamic Output Impedance (Note 5) V

Z
Z

=

6V, V

=

Frequency=0Hz

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
beyond its rated operating conditions.

Note 2: Ratings apply to ambient temperature at 25˚C. Above this temperature, derate the TO92 at 6.2 mW/˚C, and the SOT23-5 at 2.2 mW/˚C. See derating curve
in Operating Condition section..

Note 3: T
Note 4: Deviation of reference input voltage, V

See following:

J Max

=

150˚C, T

=

+(θJAPD), where PDis the operating power of the device.

T

J

A

, is defined as the maximum variation of the reference input voltage over the full temperature range.

DEV

REF,IZ

V

REF,IZ

10mA

REF

10k, R
10kΩ,R

10kΩ,R

V

REF

REF

V

REF,IZ

(see Figure 2)

=

10mA

=

10mA,

(See Figure 1)

(see Figure 2 )

to 6V

=

∞

and 2.6K

2

=

∞

2

=

∞

,

2

=

Full Range

A

(see Figure 1)

=

(see Figure 3 )

0V

=

0.1mA to 15mA

(see Figure 1)

TA= 25˚C 1.228 1.24 1.252
T

= Full Range 1.215 1.265 V

A

620mV

−1.5 −2.7 mV/V

0.15 0.5 µA

(see Figure 2)

0.1 0.4 µA

55 80 µA

0.001 0.1 µA

0.25 0.4 Ω

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LMV431AI Electrical Characteristics (Continued)

The average temperature coefficient of the reference input voltage,∝V

, is defined as:

REF

LMV431/LMV431A

DS100958-7

Where:

=

T

∝

Example: V

Note 5: The dynamic output impedance, rZ, is defined as:

When the device is programmed with two external resistors, R1 and R2, (see

full temperature change.

2−T1

can be positive or negative depending on whether the slope is positive or negative.

V

REF

DEV

=

6.0mV,

REF

=

1240mV, T

2−T1

=

125˚C.

Figure 2

), the dynamic output impedance of the overall circuit, rZ, is defined as:

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Typical Performance Characteristics

Reference Voltage vs. Junction Temperature

LMV431/LMV431A

Cathode Current vs. Cathode Voltage 1

DS100958-50

Reference Input Current vs. Junction Temperature

DS100958-62

Cathode Current vs. Cathode Voltage 2

Off-State Cathode Current vs.
Junction Temperature

DS100958-51

DS100958-63

DS100958-52

Delta Reference Voltage
Per Delta Cathode Voltage vs. Junction Temperature

DS100958-61

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Typical Performance Characteristics (Continued)

Input Voltage Noise vs. Frequency

LMV431/LMV431A

Low Frequency Peak to Peak Noise

DS100958-53

DS100958-54

DS100958-45

Test Circuit for Input Voltage

Noise vs Frequency

DS100958-64

Test Circuit for Peak to Peak

Noise (BW=0.1Hz to 10Hz)

Small Signal Voltage Gain and
Phase Shift vs. Frequency

DS100958-55

DS100958-46

Test Circuit For Voltage

Gain and Phase Shift

vs Frequency

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Typical Performance Characteristics (Continued)

Reference Impedance vs Frequency

LMV431/LMV431A

DS100958-56

Pulse Response 1

DS100958-47

Test Circuit For Reference

Impedance vs Frequency

Pulse Response 2

DS100958-48

Test Circuit for

Pulse Response 1

DS100958-57

DS100958-49

Test Circuit for Pulse Response 2

DS100958-58

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Typical Performance Characteristics (Continued)

LMV431/LMV431A

Percentage Change in V

Extrapolated from life-test data taken at 125˚C; the activation energy assumed is 0.7eV.

vs Operating Life at 55˚C

REF

DS100958-66

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Typical Applications

LMV431/LMV431A

Higher Current Shunt Regulator

Series Regulator

DS100958-16

Output Control of a Three

Terminal Fixed Regulator

DS100958-17

Crow Bar

DS100958-18

Over Voltage/Under Voltage

Protection Circuit

DS100958-19

DS100958-20

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Typical Applications (Continued)

LMV431/LMV431A

Voltage Monitor

DS100958-21

Delay Timer

Current Limiter or Current Source

DS100958-23

DS100958-22

Constant Current Sink

DS100958-24

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Physical Dimensions inches (millimeters) unless otherwise noted

LMV431/LMV431A

SOT23-5 Molded Small Outline Transistor Package (M5)

Order Number LMV431AIM5, LMV431AIM5X,LMV431IM5, LMV431IM5X,

LMV431ACM5, LMV431ACM5X, LMV431CM5 and LMV431CM5X

NS Package Number MA05A

www.national.com 14

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

LMV431/LMV431A Low-Voltage (1.24V) Adjustable Precision Shunt Regulators

Order Number LMV431AIZ, LMV431IZ, LMV431ACZ and LMV431CZ

NS Package Number Z03A

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COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

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systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the

2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.

labeling, can be reasonably expected to result in a
significant injury to the user.

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