NSC LMV431IZ, LMV431IM5X, LMV431CZ, LMV431CM5X, LMV431CM5 Datasheet

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

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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

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FIGURE 1. Test Circuit for V

=

V

Z

REF

Note: V

=

Z

(1 + R1/R2) + I

V

REF

FIGURE 2. Test Circuit for V

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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

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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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