ST TS3431 User Manual

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1.24V Programmable Shunt Voltage Reference

■ Adjustable output voltage: 1.24 to 24V

■ Several precision @ 25°C

±2%, ±1%, ±0.5% and ±0.25%

■ Sink current capability: 0.4 to 100mA

■ Industrial temperature range: -40 to +125°C

■ Performances compatible with industry

standard TL431

Description

The TS3431 is a programmable shunt voltage
reference with guaranteed temperature stability
over the entire temperature range of operation
(-40 to +125°C). The output voltage may be set to
any value between 1.24V and 24V with an
external resistor bridge.

TS3431

L

SOT23-3L

(Plastic Micropackage)

Z

TO-92

(Plastic Package)

Pin Connections (top view)

Available in SOT23-3 surface mount package, it
can be designed in applications where space
saving is a critical issue.

TO-92

(top view)

Applications

■ Computers

■ Instrumentation

■ Battery chargers

■ Switch mode power supply

■ Battery operated equipments

Refe rence

Catho de

SOT23-3

(top view)

1

3

TS3431

2

Order Codes

Part Number Temperature Range Package Packaging Marking

TS3431ILT/AILT/BILT/CILT

TS3431IZ/AIZ/BIZ/CIZ
TS3431IZT/AIZT/BIZT/CIZT Tape & Reel
TS3431IZ-AP/AIZ-AP/BIZ-AP/CIZ-AP Ammo pack

-40, +125°C

SOT23-3L Tape & Reel

Bulk

TO-92

Anode

L280-L281
L282-L283

December 2004 Revision 2 1/11

TS3431 Absolute Maximum Ratings

1 Absolute Maximum Ratings

Table 1. Key parameters and their absolute maximum ratings

Symbol Parameter Value Unit

V

I

T

ESD

Tlead Lead Temperature (soldering, 10 seconds) 250 °C

1) Pd has been calculated with T

Table 2. Operating Conditions

Symbol Parameter Value Unit

T

Cathode to Anode Voltage

KA

I

Reverse Breakdown Current

K

Reference Current

REF

Power Dissipation

P

D

Storage Temperature

std

1

SOT23-3
TO92

25 V

-100 to +150 mA

-0.05 to10 mA

360
625

-65 to +150 °C

Human Body Model (HBM) 2 kV
Machine Model (MM) 200 V

= 25°C and Tj = 150°C and Rthjc = 66°C/W, Rthja = 200°C/W for the TO92 package

amb

I

Cathode Operating Current

K

V

Cathode Operating Voltage

K

Operating Free Air Temperature Range

oper

Rthjc = 110°C/W, Rthja = 340°C/W for the SOT23-3L package

0.5 to 100 mA

1.24 to 24 V

-40 to +125 °C

mW

2/11

Electrical Characteristics TS3431

2 Electrical Characteristics

Table 3. Tamb = 25°C (unless otherwise specified)

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

K

∆V

K

T

C

I

KMIN

∆Vref

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

∆Vka

I

REF

∆I

REF

I

OFF

R

KA

E

N

Reference input voltage IK = 10mA TS3431 (2%) 1.215

TS3431A (1%) 1.228 1.252

TS3431B (0.5%) 1.234 1.246

1.24

TS3431C (0.25%) 1.237 1.243

Variation of reference input voltage over

0°C < T < +70°C 10

temperature

-40°C < T < +125°C 21

Temperature coefficient -40°C < T < +125°C

Minimum Operating Current T = 25°C 0.35 0.4

-40°C < T < +125°C 0.5

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

Reference input current
I

=10mA, R1=10KΩ, R2=+

K

∞

Reference input current deviation
I

=10mA, R1=10KΩ, R2=+

K

I

=10mA

K

= 24 to 1.24V

V

K

-40°C < T < +125°C 2

T=25°C 0.9 1.5

-40°C < T < +125°C 2

0°C < T < +70°C 0.5 1

-40°C < T < +125°C 0.9 1.5

Off-state cathode current VK=24V T=25°C 35 500

-40°C < T < +125°C 2000

Reverse Static Impedance IK = 1 to 100mA

Wideband Noise IK = 10mA

1kHz < f < 100kHz

100 nV/

1.265

100 ppm/°C

1.2 1.5

0.2 0.4

V

mV-40°C < T < +105°C 18

mA

mV/V

µA

µA

nA-40°C < T < +105°C 1000

Ω

√Hz

Note: Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation and by design.

3/11

TS3431 Electrical Characteristics

Figure 1. Reference voltage vs. temperature

1.250

1.245

1.240

Voltage Refe rence (V)

1.235

1.230

-40 0 40 80 120

Temperature (° C)

IK = 10mA
V

= V

K

REF

Figure 2. Cathode voltage vs cathode current

1.5

(V)

K

Cathode voltage V

1.0

0.5

T=-4 0°C

T=+25°C

T=+125°C

Figure 4. Test circuit for VK = Vref

Input

Ik

Vref

Output

Vka

Figure 5. Minimum operating current vs

temperature

0.5

(mA)

0.4

KMIN

0.3

VK = V

0.2

0.1

REF

0.0

0.0 0.1 0.2 0.3 0.4

Cathode current IK (mA)

Figure 3. Reference input current vs

temperature

1.00

(µA)

0.75

REF

0.50

0.25

Reference current I

0.00

-40 0 40 80 120

Temperature ( °C)

Minimu m operating current I

0.0

-40 0 40 80 120

Temper ature ( °C)

Figure 6. Dynamic impedance vs frequency

0.5

)

Ω

(

KA

0.4

0.3

0.2

Dynamic imp edance Z

0.1

0.0
10 100 1000 10000

Frequen cy (Hz)

VK = V
T=+25°C

REF

4/11

Electrical Characteristics TS3431

Figure 7. Off-State current vs temperature

300

(nA)

OFF

200

100

OFF State Current I

0

-40 0 40 80 120

Temperat ure (° C)

Figure 8. Ratio of change in reference input

voltage to change in Vka voltage vs
temperature

2.0

1.5

Figure 10. Test circuit for off-state current

measurement

Vka=24V

Ioff

Figure 11. Test circuit for V

Input

K

> V

Ik

REF

Vka

(mV/V)

K

1.0

V

∆

/

REF

V

∆

0.5

0.0

-40 0 40 80 120

Temperature (°C)

∆V

= 1.24 to 24V

K

I

= 10 mA

K

Figure 9. Phase and gain vs frequency

80

40

Phase (° )

0

40

T = +25°C

20

Gain (dB)

0

1000 1000 0 100000 1000 000

Frequency (Hz)

R1

R2

Iref

Vref

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

Figure 12. Test circuit for phase and gain

measurement

10 µF

6.8 K Ω

10 µF

Intput

4.3 K Ω

=10mA

K

I

Output

5/11

TS3431 Electrical Characteristics

Figure 13. Pulse response at Ik=1mA

5.0

Input Voltage

. . .

2.5

Voltage (V)

0.0
02468

Output voltage

. . .

Time ( µs)

T=+25°C

Figure 14. Pulse response at Ik = 10mA

5.0

2.5

Voltage (V)

Input Voltage

. . .

Output vol tage

. . .

T=+2 5°C

Figure 16. Test circuit for pulse response at Ik

= 1mA

2.7K Ω

IK=1mA

4V

0

Intput

Output

Figure 17. Test circuit for pulse response at Ik

= 10mA

270 Ω

IK=10mA

4V

0

Intput

Output

0.0
02468

Time (µs)

Figure 15. Block diagram

Cathode

Referen ce

6/11

+

-

VREF

Anode

Figure 18. Equivalent input noise vs

frequency

300

VK = V
IK = 10 mA
T = +25° C

Hz)

200

√

Noise (nV /

100

0

0.1 1 10 100 1000 10000

Frequency ( kHz)

REF

Package Mechanical Data TS3431

3 Package Mechanical Data

3.1 3 Pins - Plastic Package TO-92 (tape & reel)

A1

P

P

A

d

T

H

H

H1

L1

D0

F1

P2

I1

F2

P0

H0

W2

W0

W1

W

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

∆h -1 0 1 -0.039 0 0.039
∆P -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

7/11

TS3431 Package Mechanical Data

3.2 3 Pins - Plastic Package TO-92 (tape ammo pack)

A1

P

P

A

d

T

H

H

H1

L1

D0

F1

P2

I1

F2

P0

H0

W2

W0

W1

W

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

∆h -1 0 1 -0.039 0 0.039
∆P -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

H 20 0.787
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

8/11

Package Mechanical Data TS3431

3.3 3 Pins - Plastic Package TO-92 (bulk)

TO-92 MECHANICA DATA

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

A 4.32 4.95 170.1 194.9

b 0.36 0.51 14.2 20.1

D 4.45 4.95 175.2 194.9

E 3.30 3.94 129.9 155.1

e 2.41 2.67 94.9 105.1

e1 1.14 1.40 44.9 55.1

L 12.7 15.49 500.0 609.8

R 2.16 2.41 85.0 94.9

S1 0.92 1.52 36.2 59.8

W 0.41 0.56 16.1 22.0

mm. mils

0102782/C

9/11

TS3431 Package Mechanical Data

3.4 SOT23-3L Package

SOT23-3L MECHANICAL DATA

DIM.

mm. mils

MIN. TYP MAX. MIN. TYP. MAX.

A 0.890 1.120 35.05 44.12

A1 0.010 0.100 0.39 3.94

A2 0.880 0.950 1.020 34.65 37.41 40.17

b 0.300 0.500 11.81 19.69

C 0.080 0.200 3.15 7.88

D 2.800 2.900 3.040 110.26 114.17 119.72

E 2.100 2.64 82.70 103.96

E1 1.200 1.300 1.400 47.26 51.19 55.13

e 0.950 37.41

e1 1.900 74.82

L 0.400 0.600 15.75 23.63

L1 0.540 21.27

k8°8°

D

e

GAUGE
PLANE

0.25

L

L1

10/11

E

SEATING
PLANE

C

E1

b

e1

A2

A

c

C

0.10

7110469/A

A1

Revision History TS3431

4 Revision History

Date Revision Description of Changes

01 Jan. 2004 1 First Release

Specific content changes as follows:

• CI version added in Table: Order Codes on page 1

01 Dec. 2004 2

• Rthjc information added in Table1: Key parameters and their absolute

maximum ratings on page 2

• Test condition added in Table3: Tamb = 25°C (unless otherwise

specified) on page 3

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

The ST logo is a registered trademark of STMicro electronics

All other names are the property of their respective owners

© 2004 STMicroelectronics - All rights reserved

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11/11