LM431

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SNVS020H – MAY 2000 – REVISED JANUARY 2016

6.5 Electrical Characteristics

TA = 25°C unless otherwise specified

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VZ = VREF, II = 10 mA

2.44

2.495

2.55

LM431A (Figure 6 )

VZ = VREF, II = 10 mA

VREF

Reference voltage

2.47

2.495

2.52

V

LM431B (Figure 6 )

VZ = VREF, II = 10 mA

2.485

2.5

2.51

LM431C (Figure 6 )

Deviation of reference input voltage

VZ = VREF, II = 10 mA,

VDEV

8

17

mV

overtemperature(1)

TA = full range (Figure 6 )

VZ from VREF to 10 V

−1.4

−2.7

ΔVREF/

Ratio of the change in reference voltage to the

IZ = 10 mA

mV/V

ΔVZ

change in cathode voltage

(Figure 7 )

VZ from 10 V to 36 V

−1

−2

R1 = 10 kΩ, R2 = ∞, II = 10 mA

IREF

Reference input current

2

4

μA

(Figure 7 )

Deviation of reference input current

R1 = 10 kΩ, R2 = ∞, II = 10 mA,

∝IREF

0.4

1.2

μA

overtemperature

TA = full range (Figure 7 )

IZ(MIN)

Minimum cathode current for regulation

VZ = VREF(Figure 6 )

0.4

1

mA

IZ(OFF)

OFF-state current

VZ = 36 V, VREF = 0 V (Figure 8)

0.3

1

μA

(1)

Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference input voltage over the full temperature

range.

The average temperature coefficient of the reference input voltage,

∝VREF, is defined as:

Where:

T2 – T1 = full temperature change (0–70°C).

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

Example: VDEV = 8 mV, VREF = 2495 mV, T2 – T1 = 70°C, slope is positive.

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