LM431 datasheet(3/23 Pages) TI

3 / 23 page

LM431

www.ti.com

SNVS020G – MAY 2000 – REVISED APRIL 2013

LM431 Electrical Characteristics

TA = 25°C unless otherwise specified

Symbol

Parameter

Conditions

Min

Typ

Max

Units

VREF

Reference Voltage

VZ = VREF, II = 10 mA

2.440

2.495

2.550

LM431A (Figure 4 )

VZ = VREF, II = 10 mA

2.470

2.495

2.520

LM431B (Figure 4 )

VZ = VREF, II = 10 mA

2.485

2.500

2.510

LM431C (Figure 4 )

VDEV

Deviation of Reference Input Voltage Over

VZ = VREF, II = 10 mA,

8.0

Temperature(1)

TA = Full Range (Figure 4 )

ΔVREF/ΔVZ

Ratio of the Change in Reference Voltage

IZ = 10 mA

VZ from VREF to 10V

−1.4

−2.7

mV/V

to the Change in Cathode Voltage

(Figure 5 )

VZ from 10V to 36V

−1.0

−2.0

IREF

Reference Input Current

R1 = 10 kΩ, R2 = ∞, II = 10 mA

2.0

4.0

μA

(Figure 5 )

∝IREF

Deviation of Reference Input Current over

R1 = 10 kΩ, R2 = ∞, II = 10 mA,

0.4

1.2

μA

Temperature

TA = Full Range (Figure 5 )

IZ(MIN)

Minimum Cathode Current for Regulation

VZ = VREF(Figure 4 )

0.4

1.0

IZ(OFF)

Off-State Current

VZ = 36V, VREF = 0V (Figure 6)

0.3

1.0

μA

Dynamic Output Impedance(2)

VZ = VREF, LM431A,

0.75

Frequency = 0 Hz (Figure 4 )

VZ = VREF, LM431B, LM431C

0.50

Frequency = 0 Hz (Figure 4 )

(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 = 8.0 mV, VREF = 2495 mV, T2 − T1 = 70°C, slope is positive.

(2)

The dynamic output impedance, rZ, is defined as:

When the device is programmed with two external resistors, R1 and R2, (see Figure 5 ), the dynamic output impedance of the overall

circuit, rZ, is defined as:

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