LM431 datasheet(4/13 Pages) NSC

4 / 13 page

Absolute Maximum Ratings (Note 2)

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 (LM431xI)

−40˚C to +85˚C

Commercial (LM431xC)

0˚C to +70˚C

Soldering Information

Infrared or Convection (20 sec.)

235˚C

Wave Soldering (10 sec.)

260˚C (lead temp.)

Cathode Voltage

37V

Continuous Cathode Current

−10 mA to +150

Reference Voltage

−0.5V

Reference Input Current

10 mA

Internal Power Dissipation (Notes 3,

TO-92 Package

SO-8 Package

SOT-23 Package

0.78W

0.81W

0.28W

micro SMD Package

0.30W

Operating Conditions

Min

Max

Cathode Voltage

REF

37V

Cathode Current

1.0 mA

100 mA

LM431

Electrical Characteristics

A = 25˚C unless otherwise specified

Symbol

Parameter

Conditions

Min

Typ

Max

Units

REF

Reference Voltage

Z =VREF,II = 10 mA

2.440

2.495

2.550

LM431A (Figure 1 )

Z =VREF,II = 10 mA

2.470

2.495

2.520

LM431B (Figure 1 )

Z =VREF,II = 10 mA

2.485

2.500

2.510

LM431C (Figure 1 )

DEV

Deviation of Reference Input Voltage Over

Z =VREF,II = 10 mA,

8.0

Temperature (Note 5)

A = Full Range (Figure 1 )

Ratio of the Change in Reference Voltage

Z =10mA

Z from VREF to 10V

−1.4

−2.7

mV/V

to the Change in Cathode Voltage

(Figure 2 )V

Z from 10V to 36V

−1.0

−2.0

REF

Reference Input Current

1 =10k

Ω,R

2 = ∞,

2.0

4.0

µA

I =10mA (Figure 2 )

∝I

REF

Deviation of Reference Input Current over

1 =10k

Ω,R

2 = ∞,

Temperature

I = 10 mA,

0.4

1.2

µA

A = Full Range (Figure 2 )

Z(MIN)

Minimum Cathode Current for Regulation

Z =VREF (Figure 1 )

0.4

1.0

Z(OFF)

Off-State Current

Z = 36V, VREF =0V (Figure *NO

TARGET FOR fi* )

0.3

1.0

µA

Dynamic Output Impedance (Note 6)

Z =VREF, LM431A,

0.75

Ω

Frequency=0Hz (Figure 1 )

Z =VREF, LM431B, LM431C

0.50

Ω

Frequency=0Hz (Figure 1 )

Note 2: 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 3: TJ Max = 150˚C.

Note 4: Ratings apply to ambient temperature at 25˚C. Above this temperature, derate the TO-92 at 6.2 mW/˚C, the SO-8 at 6.5 mW/˚C, the SOT-23 at 2.2 mW/˚C

and the micro SMD at 3mW/˚C.

Note 5: Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference input voltage over the full temperature range.

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