ST TS431 User Manual

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TS431

Low voltage adjustable shunt reference

Features

■ Low voltage operation: 1.24 to 6 V

■ 2 %, 1 % and 0.5 % voltage precision

■ Wide operating range cathode current: 60 µA

to 30 mA

■ Low output impedance: 0.2 Ω

■ Typically stable for any capacitive loads

■ ESD protection:

– Human body model: 2 kV – Machine model: 200 V

■ 100 ppm/°C temperature coefficient

Description

The TS431 is a low-voltage, three-terminal, programmable shunt voltage reference. The output voltage can be set to any value between V

(1.24 V) and 6 V with two external resistors.

ref

The TS431 is able to operate at a lower voltage (1.24 V) and lower cathode current than the widely used TL431 and TL1431 shunt voltage reference. When driving an optocoupler, the TS431 is particularly useful for regulating 3.3 V switching power supplies.

TO92

(Plastic package)

SOT23-5

(Plastic micropackage)

August 2010 Doc ID 5558 Rev 7 1/13

www.st.com

Absolute maximum ratings and operating conditions TS431

1 Absolute maximum ratings and operating conditions

Table 1. Absolute maximum ratings

Symbol Parameter Value Unit

1. T

Table 2. Operating conditions

Cathode to anode voltage 10 V

Continuous cathode current range -20 to +40 mA

Reference input current range -0.05 to +3 mA

ref

= 25 °C with

amb

(1)

625 500

Power dissipation

TO92 package SOT23-5 package

Storage temperature range -65 to +150 °C

stg

= 150 °C, T

junction

= 200 °C/W for TO92 package and

thJA

= 250 °C/W for SOT23-5L package

thJA

Symbol Parameter Value Unit

Cathode to anode voltage 1.24 to 6 V

Cathode current 0.06 to 30 mA

Operating free air temperature range -40 to +125 °C

oper

2/13 Doc ID 5558 Rev 7

TS431 Electrical characteristics

2 Electrical characteristics

Table 3. T

= 25°C (unless otherwise specified)

amb

Symbol Parameter Test conditions Min. Typ. Max. Unit

ΔV

ΔVref

---------------ΔVka

ΔI

1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and by design.

2. See definition below.

Output voltage

ref

= V

@ Ik = 100μA

ref

Output voltage change Ik = 100μA, VKA = V

ref

(1) (2)

Ratio of change in reference input voltage to change in cathode to anode voltage

Reference input current Ik = 10mA 70 160 nA

ref

Reference input current deviation

ref

over temperature range

Minimum cathode current for

min

regulation

Off-state cathode current VKA = 6V, V

off

Static impedance VKA = V

TS431 TS431A TS431B

0 < T

-40 < T

= 10mA

=10mA, R1=10kΩ, R2=∝

-40 < T

< +70°C

amb

< +85°C

amb

< +105°C

amb

< +125°C

amb

= 6V to V

= V

ref

< +85°C

amb

< +125°C

amb

ref

= 0 0.001 0.1 μA

ref

, Ik = 0.1 to 15mA 0.2 0.4 Ω

ref

1.215

1.228

1.234

1.240 1.265

1.252

1.246

9 16 18 21

1.8 2.7 mV/V

70 90

160 240

40 60 μA

2.1 Definition of output voltage change over temperature range

ΔV

is defined as the difference between the maximum and minimum values obtained over

ref

the full temperature range.

ΔV

= V

ref

Figure 1. Output voltage change over temperature range

Vref max.

Vref min.

ref max

- V

ref min

Temperature

Doc ID 5558 Rev 7 3/13

Electrical characteristics TS431

Figure 2. Reference voltage vs. temperature Figure 3. Test circuit for VKA = V

1.252

Vka = Vref

Ik = 100 µA

Reference voltage (V)

1.248

1.244

1.24

1.236

1.232

1.228

-40 -20 0 20 40 60 80 100 120

Temperature (°C)

Figure 4. Cathode voltage vs. cathode

current

Vka = Vref

T = 25°C

Input

Vref

Figure 5. Cathode voltage vs. cathode

current

1.5

ref

Output

Vka

-5

Ika Cathode current (mA)

-10

-15

-1 -0.5 0 0.5 1 1.5

Vka Cathode voltage (V)

Figure 6. Reference input current vs.

temperature

100

Iref Reference current (nA)

-40 -20 0 20 40 60 80 100 120

Temperature (°C)

Ik = 10mA

R1 = 10 K

R2 = +

∞

0.5

Vka Cathode voltage (V)

0 102030405060

+25°C

-40°C

Ika Cathode current (µA)

+85°C

+125°C

Figure 7. Static impedance vs. temperature

0.4

0.3

Vka = Vref Ik = 100µA to 15mA

0.2

0.1

Rka Static Impedance (Ohms)

-40 -20 0 20 40 60 80 100 120

Temperature (°C)

4/13 Doc ID 5558 Rev 7

TS431 Electrical characteristics

Figure 8. Off-state current vs. temperature Figure 9. Test circuit for off-state current

measurement

200

150

100

IOff Off-State current (nA)

-40 -20 0 20 40 60 80 100 120

Temperature (°C)

Figure 10. Ratio of change in reference input

voltage to change in V

voltage

Input

Figure 11. Test circuit for V

Ioff

> V

Vka=6V

ref

vs. temperature

Input

Vka

-1

Iref

-2

-3

Ratio of change in reference input voltage (mV/V)

-40-20 0 20406080100120

Temperature (°C)

Ik = 10mA

Vka = 6V to Vref

Vref

Vka = Vref . (1+R1/R2) + Iref . R1

Figure 12. Phase and gain vs. frequency Figure 13. Test circuit for phase and gain

measurement

Gain (dB)

Gain

1E+3 1E+4 1E+5 1E+6

Phase

Phase margin # 50°

Frequency (Hz)

150

100

-50

-100

-150

Phase (°)

Input

10µF

6.8K

4.3K

10µF

Ik=100µA

Vref

Output

Doc ID 5558 Rev 7 5/13

Electrical characteristics TS431

250

Figure 14. Pulse response at Ik = 100 µA Figure 15. Test circuit for pulse response at

= 100 µA

Input voltage

18KΩ

Ik=100µA

Output voltage

input and output voltage (V)

012345678910

Time (µs)

Pulse Generator f=100KHz

50Ω

Intput

Figure 16. Pulse response at Ik = 1mA Figure 17. Test circuit for pulse response at

= 1 mA

Input voltage

1.8KΩ Ik=1mA

Output

Output voltage

input and output voltage (V)

01234567

Time (µs)

Figure 18. Equivalent input noise vs. frequency

200

150

Vka = Vref

100

Equivalent input noise (nv/VHz)

0.1 1 10 100 1000

Ik = 100 µA T=25°C

Frequency (KHz)

Pulse

Generator

f=100KHz

50Ω

Intput

Output

6/13 Doc ID 5558 Rev 7

TS431 Package information

3 Package information

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK specifications, grade definitions and product status are available at: www.st.com. ECOPACK

packages, depending on their level of environmental compliance. ECOPACK®

is an ST trademark.

Doc ID 5558 Rev 7 7/13

Package information TS431

Table 4. SOT23-5 package mechanical data

Dimensions

Ref.

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

A 0.90 1.45 0.035 0.057

A1 0.00 0.15 0.00 0.006

A2 0.90 1.30 0.035 0.051

b 0.35 0.50 0.014 0.02

C 0.09 0.20 0.003 0.008

D 2.80 3.00 0.110 0.118

H 2.60 3.00 0.102 0.118

E 1.50 1.75 0.059 0.069

e 0.95 0.037

e1 1.9 0.075

L 0.35 0.55 0.014 0.022

Millimeters Inches

8/13 Doc ID 5558 Rev 7

TS431 Package information

Figure 19. TO92 (tape ammopack and tape and reel) package data

Millimeters Inches

Dim.

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

AL 5.0 0.197

A 5.0 0.197

T 4.0 0.157

d 0.45 0.018

I1 2.5 0.098

P 11.7 12.7 13.7 0.461 0.500 0.539

PO 12.4 12.7 13 0.488 0.500 0.512

P2 5.95 6.35 6.75 0.234 0.250 0.266

F1/F2 2.4 2.5 2.8 0.094 0.098 0.110

Δh -1 0 1 -0.039 0 0.039

ΔP -1 0 1 -0.039 0 0.039

W 17.5 18.0 19.0 0.689 0.709 0.748

W0 5.7 6 6.3 0.224 0.236 0.248

W1 8.5 9 9.75 0.335 0.354 0.384

W2 0.5 0.020

H200.787

H0 15.5 16 16.5 0.610 0.630 0.650

H1 25 0.984

DO 3.8 4.0 4.2 0.150 0.157 0.165

L1 11 0.433

Doc ID 5558 Rev 7 9/13

Package information TS431

Figure 20. TO92 (bulk) package mechanical data

Millimeters Inches

Dim.

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

L 1.27 0.05

B 3.2 3.7 4.2 0.126 0.1457 0.1654

O1 4.45 5.00 5.2 0.1752 0.1969 0.2047

C 4.58 5.03 5.33 0.1803 0.198 0.2098

K12.7 0.5

O2 0.407 0.5 0.508 0.016 0.0197 0.02

a 0.35 0.0138

10/13 Doc ID 5558 Rev 7

TS431 Ordering information

4 Ordering information

Table 5. Order codes

Order codes Temperature range Packages Packing Marking

TS431ILT

TS431AILT L271

SOT23-5

L272

TS431BILT L270

TS431IYLT

TS431AIYLT

TS431BIYLT

(1)

-40°C, + 125°C

SOT23-5

(automotive grade level)

TS431IZ/IZT/IZ-AP

TS431AIZ/AIZT/AIZ-AP TS431AI

TO92

TS431BIZ/BIZT/BIZ-AP TS431BI

1. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001 & Q 002 or equivalent are on-going.

Tape and reel

Bulk (Z),

Tape and reel (ZT) or

Ammo pack (AP)

L274

L276

L273

TS431I

Doc ID 5558 Rev 7 11/13

Revision history TS431

5 Revision history

Table 6. Document revision history

Date Revision Changes

1-Sep-2003 1 Initial release.

1-Oct-2005 2

2-Jan-2006 3 TS431AIYLT PPAP reference inserted. See the order codes table.

22-Sep-2006 4

25-Apr-2007 5

30-Aug-2007 6

27-Aug-2010 7 Modified note for package SOT23-5 on page 1.

PPAP references inserted in the datasheet. See the order codes table. Minor changes to formatting and grammar.

Included footnote on automotive grade qualification to order codes table. Updated package information (changed mils to inches).

Resized graphics on cover page. Moved definition of output voltage change from Ta bl e 3 footnote to separate section

below table. Corrected errors in SOT23-5 package mechanical data. Removed erroneous drawing for TO92 tape & reel package.

Updated drawing for TO92 bulk package. Modified footnote related to automotive grade qualification in Table 5: Order codes,

and re-ordered order codes.

12/13 Doc ID 5558 Rev 7

TS431

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Doc ID 5558 Rev 7 13/13

ST TS431 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Absolute maximum ratings and operating conditions

Table 1. Absolute maximum ratings

Table 2. Operating conditions

2 Electrical characteristics

2.1 Definition of output voltage change over temperature range

Figure 1. Output voltage change over temperature range

Figure 7. Static impedance vs. temperature

Figure 12. Phase and gain vs. frequency Figure 13. Test circuit for phase and gain

Figure 14. Pulse response at Ik = 100 µA Figure 15. Test circuit for pulse response at

Figure 16. Pulse response at Ik = 1mA Figure 17. Test circuit for pulse response at

Figure 18. Equivalent input noise vs. frequency

3 Package information

Table 4. SOT23-5 package mechanical data

Figure 19. TO92 (tape ammopack and tape and reel) package data

Figure 20. TO92 (bulk) package mechanical data

4 Ordering information

Table 5. Order codes

5 Revision history

Table 6. Document revision history