Datasheet LMV431BCMDC, LMV431BCM5X, LMV431AIMFX, LMV431AIMF, LMV431BCM5 Datasheet (NSC)

LMV431/LMV431A/LMV431B
Low-Voltage (1.24V) Adjustable Precision Shunt
Regulators

General Description

The LMV431, LMV431A and LMV431B are precision 1.24V
shunt regulators capable of 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 at the 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, LMV431A and LMV431B have respective ini­tial tolerances of 1.5%, 1% and 0.5%, and 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.
These parts are typically stable with capacitive loads greater
than 10nF and less than 50pF.

The LMV431, LMV431A and LMV431B provide performance
at a competitive price.

Features

n Low Voltage Operation/Wide Adjust Range (1.24V/30V)
n 0.5% Initial Tolerance (LMV431B)
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

Connection Diagrams

TO92: Plastic Package

10095801

Top View

SOT23-5

10095844

*

Pin 1 is not internally connected.

*

Pin 2 is internally connected to Anode pin. Pin 2 should be either floating

or connected to Anode pin.

Top View

SOT23-3

10095867

Top View

August 2003

LMV431/LMV431A/LMV431B Low-Voltage (1.24V) Adjustable Precision Shunt Regulators

© 2003 National Semiconductor Corporation DS100958 www.national.com

Symbol and Functional Diagrams

10095859

10095860

Simplified Schematic

10095803

LMV431/LMV431A/LMV431B

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Ordering Information

Package Temperature

Range

Voltage Tolerance Part Number Package Marking NSC Drawing

TO92

Industrial Range

−40˚C to +85˚C

1% LMV431AIZ LMV431AIZ

Z03A

1.5% LMV431IZ LMV431IZ

Commerial Range

0˚C to +70˚C

0.5% LMV431BCZ LMV431BCZ

1% LMV431ACZ LMV431ACZ

1.5% LMV431CZ LMV431CZ

SOT23-5

Industrial Range

−40˚C to +85˚C

1% LMV431AIM5 N08A

MF05A

1% LMV431AIM5X N08A

1.5% LMV431IM5 N08B

1.5% LMV431IM5X N08B

Commercial Range

0˚C to +70˚C

0.5% LMV431BCM5 N09C

0.5% LMV431BCM5X N09C

1% LMV431ACM5 N09A

1% LMV431ACM5X N09A

1.5% LMV431CM5 N09B

1.5% LMV431CM5X N09B

SOT23-3

Industrial Range

−40˚ to +85˚C

0.5% LMV431BIMF
RLB

MF03A

0.5% LMV431BIMFX

1% LMV431AIMF

RLA

1% LMV431AIMFX

DC/AC Test Circuits for Table and
Curves

10095804

FIGURE 1. Test Circuit for VZ=V

REF

10095805

Note: VZ=V

REF

(1 + R1/R2) + I

REF

•

R1

FIGURE 2. Test Circuit for V

Z

>

V

REF

10095806

FIGURE 3. Test Circuit for Off-State Current

LMV431/LMV431A/LMV431B

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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

Industrial (LMV431AI, LMV431I) −40˚C to +85˚C

Commercial (LMV431AC,

LMV431C, LMV431BC)

0˚C to +70˚C

Lead Temperature

TO92 Package/SOT23 -5,-3 Package

(Soldering, 10 sec.) 265˚C

Internal Power Dissipation (Note 2)

TO92

0.78W

SOT23-5, -3 Package 0.28W

Cathode Voltage 35V

Continuous Cathode Current −30 mA to +30mA

Reference Input Current range −.05mA to 3mA

Operating Conditions

Cathode Voltage V

REF

to 30V

Cathode Current 0.1 mA to 15mA

Temperature range

LMV431AI −40˚C ≤ T

A

≤ 85˚C

Thermal Resistance (θ

JA

)(Note 3)

SOT23-5, -3 Package 455 ˚C/W

TO-92 Package 161 ˚C/W

Derating Curve (Slope = −1/θ

JA

)

10095830

LMV431C Electrical Characteristics

TA= 25˚C unless otherwise specified

Symbol Parameter Conditions Min Typ Max Units

V

REF

Reference Voltage VZ=V

REF,IZ

= 10mA

(See Figure 1 )

TA= 25˚C 1.222 1.24 1.258

T

A

= Full Range 1.21 1.27 V

V

DEV

Deviation of Reference Input Voltage
Over Temperature (Note 4)

VZ=V

REF,IZ

= 10mA,

T

A

= Full Range (See Figure 1)

412mV

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

I

Z

= 10mA (see Figure 2 )

V

Z

from V

REF

to 6V

R

1

= 10k, R2=∞and 2.6k

−1.5 −2.7 mV/V

I

REF

Reference Input Current R1= 10kΩ,R2=

∞

II= 10mA (see Figure 2)

0.15 0.5 µA

∝

I

REF

Deviation of Reference Input Current
over Temperature

R1= 10kΩ,R2=∞,
I

I

= 10mA, TA= Full Range (see Figure 2)

0.05 0.3 µA

I

Z(MIN)

Minimum Cathode Current for
Regulation

VZ=V

REF

(see Figure 1)5580µA

I

Z(OFF)

Off-State Current VZ=6V, V

REF

=0V(see Figure 3 ) 0.001 0.1 µA

r

Z

Dynamic Output Impedance (Note 5) VZ=V

REF,IZ

= 0.1mA to 15mA

Frequency = 0Hz (see Figure 1) 0.25 0.4 Ω

LMV431/LMV431A/LMV431B

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LMV431I Electrical Characteristics

TA= 25˚C unless otherwise specified

Symbol Parameter Conditions Min Typ Max Units

V

REF

Reference Voltage VZ=V

REF,IZ

= 10mA

(See Figure 1 )

TA= 25˚C 1.222 1.24 1.258

V

T

A

= Full Range 1.202 1.278

V

DEV

Deviation of Reference Input Voltage
Over Temperature (Note 4)

VZ=V

REF,IZ

= 10mA,

T

A

= Full Range (See Figure 1)

620mV

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

I

Z

= 10mA (see Figure 2 )

V

Z

from V

REF

to 6V

R

1

= 10k, R2=∞and 2.6k

−1.5 −2.7 mV/V

I

REF

Reference Input Current R1= 10kΩ,R2=

∞

II= 10mA (see Figure 2)

0.15 0.5 µA

∝

I

REF

Deviation of Reference Input Current
over Temperature

R1= 10kΩ,R2=∞,
I

I

= 10mA, TA= Full Range (see Figure 2)

0.1 0.4 µA

I

Z(MIN)

Minimum Cathode Current for
Regulation

VZ=V

REF

(see Figure 1)

55 80 µA

I

Z(OFF)

Off-State Current VZ= 6V, V

REF

=0V(see Figure 3 ) 0.001 0.1 µA

r

Z

Dynamic Output Impedance (Note 5) VZ=V

REF,IZ

= 0.1mA to 15mA

Frequency = 0Hz (see Figure 1) 0.25 0.4 Ω

LMV431AC Electrical Characteristics

TA= 25˚C unless otherwise specified

Symbol Parameter Conditions Min Typ Max Units

V

REF

Reference Voltage VZ=V

REF,IZ

=10mA

(See Figure 1 )

TA= 25˚C 1.228 1.24 1.252

V

T

A

= Full Range 1.221 1.259

V

DEV

Deviation of Reference Input Voltage
Over Temperature (Note 4)

VZ=V

REF,IZ

= 10mA,

T

A

= Full Range (See Figure 1)

412mV

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

I

Z

=10mA(see Figure 2 )

V

Z

from V

REF

to 6V

R

1

= 10k, R2=∞and 2.6k

−1.5 −2.7 mV/V

I

REF

Reference Input Current R1=1kΩ,R2=

∞

II=10mA(see Figure 2)

0.15 0.50 µA

∝

I

REF

Deviation of Reference Input Current
over Temperature

R1=10kΩ,R2=∞,
I

I

= 10 mA, TA= Full Range (see Figure 2)

0.05 0.3 µA

I

Z(MIN)

Minimum Cathode Current for
Regulation

VZ=V

REF

(see Figure 1)

55 80 µA

I

Z(OFF)

Off-State Current VZ= 6V, V

REF

=0V(see Figure 3 ) 0.001 0.1 µA

r

Z

Dynamic Output Impedance (Note 5) VZ=V

REF,IZ

= 0.1mA to 15mA

Frequency = 0 Hz (see Figure 1) 0.25 0.4 Ω

LMV431/LMV431A/LMV431B

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LMV431AI Electrical Characteristics

TA= 25˚C unless otherwise specified

Symbol Parameter Conditions Min Typ Max Units

V

REF

Reference Voltage VZ=V

REF,IZ

= 10mA

(See Figure 1 )

TA= 25˚C 1.228 1.24 1.252

T

A

= Full Range 1.215 1.265 V

V

DEV

Deviation of Reference Input Voltage
Over Temperature (Note 4)

VZ=V

REF,IZ

= 10mA,

T

A

= Full Range (See Figure 1)

620mV

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

I

Z

= 10mA (see Figure 2 )

V

Z

from V

REF

to 6V

R

1

= 10k, R2=∞and 2.6k

−1.5 −2.7 mV/V

I

REF

Reference Input Current R1= 10kΩ,R2=

∞

II= 10mA (see Figure 2)

0.15 0.5 µA

∝

I

REF

Deviation of Reference Input Current
over Temperature

R1= 10kΩ,R2=∞,
I

I

= 10mA, TA= Full Range (see Figure 2)

0.1 0.4 µA

I

Z(MIN)

Minimum Cathode Current for
Regulation

VZ=V

REF

(see Figure 1)

55 80 µA

I

Z(OFF)

Off-State Current VZ= 6V, V

REF

=0V(see Figure 3 ) 0.001 0.1 µA

r

Z

Dynamic Output Impedance (Note 5) VZ=V

REF,IZ

= 0.1mA to 15mA

Frequency = 0Hz (see Figure 1) 0.25 0.4 Ω

LMV431BC Electrical Characteristics

TA= 25˚C unless otherwise specified

Symbol Parameter Conditions Min Typ Max Units

V

REF

Reference Voltage VZ=V

REF,IZ

= 10mA

(See Figure 1 )

TA= 25˚C 1.234 1.24 1.246

T

A

= Full Range 1.227 1.253 V

V

DEV

Deviation of Reference Input Voltage
Over Temperature (Note 4)

VZ=V

REF,IZ

= 10mA,

T

A

= Full Range (See Figure 1)

412mV

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

I

Z

= 10mA (see Figure 2 )

V

Z

from V

REF

to 6V

R

1

= 10k, R2=∞and 2.6k

−1.5 −2.7 mV/V

I

REF

Reference Input Current R1= 10kΩ,R2=

∞

II= 10mA (see Figure 2)

0.15 0.50 µA

∝

I

REF

Deviation of Reference Input Current
over Temperature

R1= 10kΩ,R2=∞,
I

I

= 10mA, TA= Full Range (see Figure 2)

0.05 0.3 µA

I

Z(MIN)

Minimum Cathode Current for
Regulation

VZ=V

REF

(see Figure 1)

55 80 µA

I

Z(OFF)

Off-State Current VZ= 6V, V

REF

=0V(see Figure 3 ) 0.001 0.1 µA

r

Z

Dynamic Output Impedance (Note 5) VZ=V

REF,IZ

= 0.1mA to 15mA

Frequency = 0Hz (see Figure 1) 0.25 0.4 Ω

LMV431BI Electrical Characteristics

TA= 25˚C unless otherwise specified

Symbol Parameter Conditions Min Typ Max Units

V

REF

Reference Voltage VZ=V

REF,IZ

= 10mA

(See Figure 1 )

TA= 25˚C 1.234 1.24 1.246

T

A

= Full Range 1.224 1.259 V

V

DEV

Deviation of Reference Input Voltage
Over Temperature (Note 4)

VZ=V

REF,IZ

= 10mA,

T

A

= Full Range (See Figure 1)

620mV

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

I

Z

= 10mA (see Figure 2 )

V

Z

from V

REF

to 6V

R

1

= 10k, R2=∞and 2.6k

−1.5 −2.7 mV/V

I

REF

Reference Input Current R1= 10kΩ,R2=

∞

II= 10mA (see Figure 2)

0.15 0.50 µA

LMV431/LMV431A/LMV431B

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LMV431BI Electrical Characteristics (Continued)

TA= 25˚C unless otherwise specified

Symbol Parameter Conditions Min Typ Max Units

∝

I

REF

Deviation of Reference Input Current
over Temperature

R1= 10kΩ,R2=∞,
I

I

= 10mA, TA= Full Range (see Figure 2)

0.1 0.4 µA

I

Z(MIN)

Minimum Cathode Current for
Regulation

VZ=V

REF

(see Figure 1)

55 80 µA

I

Z(OFF)

Off-State Current VZ= 6V, V

REF

=0V(see Figure 3 ) 0.001 0.1 µA

r

Z

Dynamic Output Impedance (Note 5) VZ=V

REF,IZ

= 0.1mA to 15mA

Frequency = 0Hz (see Figure 1) 0.25 0.4 Ω

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

J Max

= 150˚C, TJ=TA+(θJAPD), where PDis the operating power of the device.

Note 4: Deviation of reference input voltage, V

DEV

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

See following:

LMV431/LMV431A/LMV431B

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LMV431BI Electrical Characteristics (Continued)

10095807

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

REF

, is defined as:

Where:

T

2−T1

= full temperature change.

∝

V

REF

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

Example: V

DEV

= 6.0mV,

REF

= 1240mV, T2−T1= 125˚C.

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

When the device is programmed with two external resistors, R1 and R2, (see Figure 2 ), the dynamic output impedance of the overall circuit, rZ, is defined as:

LMV431/LMV431A/LMV431B

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Typical Performance Characteristics

Reference Voltage vs. Junction Temperature Reference Input Current vs. Junction Temperature

10095850

10095862

Cathode Current vs. Cathode Voltage 1 Cathode Current vs. Cathode Voltage 2

10095851

10095852

Off-State Cathode Current vs.

Junction Temperature

Delta Reference Voltage Per

Delta Cathode Voltage vs. Junction Temperature

10095863

10095861

LMV431/LMV431A/LMV431B

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Typical Performance Characteristics (Continued)

Input Voltage Noise vs. Frequency

10095853

10095845

Test Circuit for Input Voltage Noise vs. Frequency

Low Frequency Peak to Peak Noise

10095854

10095864

Test Circuit for Peak to Peak Noise (BW= 0.1Hz to 10Hz)

Small Signal Voltage Gain and Phase Shift vs.

Frequency

10095855

10095846

Test Circuit For Voltage Gain and Phase Shift vs.

Frequency

LMV431/LMV431A/LMV431B

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Typical Performance Characteristics (Continued)

Reference Impedance vs. Frequency

10095856

10095847

Test Circuit for Reference Impedance vs. Frequency

Pulse Response 1

10095857

10095848

Test Circuit for Pulse Response 1

Pulse Response 2

10095858

10095849

Test Circuit for Pulse Response 2

LMV431/LMV431A/LMV431B

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Typical Performance Characteristics (Continued)

LMV431 Stability Boundary Condition

10095868

10095869

Test circuit for VZ=V

REF

10095870

Test Circuit for VZ= 2V, 3V

Percentage Change in V

REF

vs. Operating Life at 55˚C

10095866

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

LMV431/LMV431A/LMV431B

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Typical Applications

Series Regulator Output Control of a Three Terminal Fixed Regulator

10095816

10095817

Higher Current Shunt Regulator Crow Bar

10095818

10095819

Over Voltage/Under VoltageProtection Circuit Voltage Monitor

10095820

10095821

LMV431/LMV431A/LMV431B

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Typical Applications (Continued)

Delay Timer Current Limiter or Current Source

10095822

10095823

Constant Current Sink

10095824

LMV431/LMV431A/LMV431B

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Physical Dimensions inches (millimeters) unless otherwise noted

SOT23-5 Molded Small Outline Transistor Package (M5)

NS Package Number MF05A

SOT23-3 Molded Small Outline Transistor Package (M3)

NS Package Number MF03A

LMV431/LMV431A/LMV431B

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

TO-92 Plastic Package

NS Package Number Z03A

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COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

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whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.

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.

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LMV431/LMV431A/LMV431B Low-Voltage (1.24V) Adjustable Precision Shunt Regulators

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.