STMicroelectronics TL431 Technical data

■ Adjustable output voltage: 2.5 to 36V

■ Sink current capability: 1 to 100mA

■ Typical output impedance: 0.22Ω

■ 1% and 2% voltage precision

Description

The TL431 is a programmable shunt voltage
reference with guaranteed temperature stability
over the entire temperature range of operation.

TL431

Programmable Voltage Reference

Z

TO92

(Plastic Package)

The output voltage may be set to any value
between 2.5V and 36V with two external resistors.

The TL431 operates with a wide current range

(Plastic Micropackage)

D

SO-8

from 1 to 100mA with a typical dynamic
impedance of 0.22Ω.

Order Codes

Part Number

TL431CD/CDT

TL431ACD/ACDT 431AC

TL431CZ/CZT/CZ-AP

TL431ACZ/ACZT/ACZ-AP TL431AC

TL431ID/IDT

TL431AID/AIDT 431AI

TL431IZ/IZT/IZ-AP

TL431AIZ/AIZT/AIZ-AP TL431AI

Temperature

Range

0, +70°C

-40, + 105°C

Package Packing Marking

SO-8

TO92

SO-8

TO92

Tube or Tape & Reel

431C

TL431C

431I

TL431I

TL431IYD/IYDT

SO-8 (automotive grade level)

TL431AIYD/AIYDT 431AIY

November 2005 1/13

431IY

Rev 2

www.st.com

13

Pin Diagrams TL431

1 Pin Diagrams

Figure 1. TO92 pin connections (top view)

Cathode

Anode

123

Figure 2. SO-8 pin connections (top view)

8765

1234

Reference

1 - Cathode
2 - Anode
3 - Anode
4 - N.C.
5 - N.C.
6 - Anode
7 - Anode
8 - Reference

2/13

TL431 Absolute Maximum Ratings

2 Absolute Maximum Ratings

Table 1. Key parameters and their absolute maximum ratings

Symbol Parameter Value Unit

V

T

1. Pd is calculated with T

Cathode to Anode Voltage 37 V

KA

I

Continuous Cathode Current Range -100 to +150 mA

k

I

Reference Input Current Range -0.05 to +10 mA

ref

Power Dissipation

P

d

TO92
SO-8 batwing

Storage Temperature Range -65 to +150 °C

stg

R

= 200°C/W for TO92 package

thja

R

= 130°C/W for SO-8 batwing package

thja

(1)

= +25°C, Tj = +150°C and

amb

625
960

mW

Table 2. Operating conditions

Symbol Parameter Value Unit

V

T

Cathode to Anode Voltage

KA

I

Cathode Current 1 to 100 mA

k

Operating Free-air Temperature Range

oper

TL431C/AC
TL431I/AI

to 36

V

ref

0 to +70

-40 to +105

V

°C

3/13

Electrical Characteristics TL431

3 Electrical Characteristics

Tabl e 3 . T

= 25°C (unless otherwise specified)

amb

Symbol Parameter

Reference Input Voltage

V

ref

= V

V

KA

T

min

, Ik = 10 mA, T

ref

≤T

amb

≤ T

amb

max

Reference Input Voltage Deviation Over Temperature

ref

Range

VKA = Vref, Ik = 10 mA, T

min

∆V

(1)

Ratio of Change in Reference Input Voltage to Change

∆Vref

------------

∆Vka

in Cathode to Anode Voltage

Ik = 10mA - ∆V
∆V

= 36V to 10V

KA

= 10V to Vref

KA

Reference Input Current
Ik = 10mA, R1 = 10kΩ, R2 = ∞

I

ref

T
T

amb
min

= 25°C

≤T

amb

≤T

max

Reference Input Current Deviation Over Temperature

∆I

⏐ZKA⏐

1.∆V

Range

I

min

I

∆

ref

off

V

Ik = 10mA, R1 = 10kΩ, R2 =∞
T

≤T

amb

≤ T

max

min

Minimum Cathode Current for Regulation

= V

V

KA

ref

Off-State Cathode Current 2.6 1000 2.6 1000 nA

Dynamic Impedance

VKA = V

is defined as the difference between the maximum and minimum values obtained over the full temperature range.

ref

= V

ref

ref max.

, ∆ Ik = 1 to100mA, f ≤1kHZ

ref

- V

ref min.

(2)

= 25°C

≤T

amb

≤ T

max

TL431C TL431AC

Min. Typ. Max. Min. Typ. Max.

2.44

2.423

2.495 2.55

2.567

2.47

2.453

2.495 2.52

2.537

317 315

-1.4-1-2.7

-2

1.8 4

5.2

-1.4-1-2.7

-2

1.8 4

5.2

0.4 1.2 0.4 1.2

0.5 1 0.5 0.6

0.22 0.5 0.22 0.5

Unit

V

mV

mV/V

µA

µA

mA

Ω

V

ref max.

V

ref min.

T1

2. The dynamic Impedance is definied as |ZKA|

∆VKA

=

------ ---------- -

∆IK

4/13

T2

Temperature