ST TS2431 User Manual

Programmable shunt voltage reference

Features

■ Adjustable output voltage: 2.5 to 24 V

■ Precision selection at 25 °C: ± 2%, ± 1% and

±0.5%

■ Sink current capability: 1 to 100 mA

■ Industrial temperature range: - 40 to +105 °C

■ Performances compatible with industry-

standard TL431

TS2431

Datasheet − production data

SOT23-3L

(plastic micropackage)

Pin connections (top view)

Applications

■ Computers

■ Instrumentation

■ Battery chargers

■ Switch mode power supplies

■ Battery-operated equipment

Description

The TS2431 is a programmable shunt voltage
reference with guaranteed temperature stability
over the entire temperature range of operation

- 40 to + 105 °C. The output voltage may be set to
any value between 2.5 and 24 V with an external
resistor bridge. Available in a SOT23-3L surface
mount package, the device can be implemented
in applications where space-saving is of utmost
importance.

Cathode

Reference

1

Anode

3

TS2431

2

Table 1. Device summary

Order codes Temperature range Package Packing Precision Marking

TS2431ILT

TS2431AILT 1% L286

TS2431BILT 0.5% L287

May 2012 Doc ID 7961 Rev 3 1/11

This is information on a product in full production.

-40 to +105°C SOT23-3L Tape and reel

2% L285

www.st.com

11

Contents TS2431

Contents

1 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3

2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1 SOT23-3L package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2/11 Doc ID 7961 Rev 3

TS2431 Absolute maximum ratings and operating conditions

1 Absolute maximum ratings and operating conditions

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

Vka Cathode to anode voltage 25 V

I

K

I

REF

P

T

std

ESD

T

LEAD

1. Pd has been calculated with Tamb = 25°C, Tjunction = 150°C, Rthjc = 110°C/W and Rthja = 340°C/W for
the SOT23-3 package.

2. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a

1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.

3. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of
connected pin combinations while the other pins are floating.

Table 3. Operating conditions

Reverse breakdown current -100 to +150 mA

Reference input current range -0.05 to +10 mA

Power dissipation

d

(1)

SOT23-3L

360 mW

Storage temperature -65 to +150 °C

(3)

(2)

2kV

200 V

Human body model (HBM)

Machine model (MM)

Lead temperature (soldering, 10 seconds) 260 °C

Symbol Parameter Value Unit

V

KA

I

K

T

oper

1. Maximum power dissipation must be strictly observed to avoid damaging the component.

Cathode to anode voltage V

Cathode operating current

(1)

to 24 V

REF

1 to 100 mA

Operating free air temperature range - 40 to + 105 °C

Doc ID 7961 Rev 3 3/11

Electrical characteristics TS2431

2 Electrical characteristics

Table 4. Electrical characteristics (Tamb = 25 °C unless otherwise specified)

Symbol Parameter Test condition Min. Typ. Max. Unit

V

= V

K

, IK = 10 mA 2.5

REF

TS2431 (2%) 2.45 2.55

V

Reference input voltage

REF

TS2431A (1%) 2.475 2.525

TS2431B (0.5%) 2.488 2.512

0 °C < T < +70 °C 10 20

-40 °C < T < +105 °C 20 35

-40 °C < T < +105 °C 50 100 ppm/°C

|ΔV

Reference input voltage deviation over

|

temperature

T

REF

C

= V

V

K

, IK = 10 mA

REF

Temperature coefficient

(1) (2)

(2)

T = 25 °C 0.3 0.8

I

KMIN

ΔVref

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

ΔVk

I

|ΔI

I

|Z

Minimum operating current

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

Reference input current

REF

REF

OFF

KA

= 10 mA, R1 = 10 kΩ, R2 = +

I

K

Reference input current deviation

|

= 10 mA, R1 = 10 kΩ, R2 = +

I

K

Off-state cathode current VK = 24 V, V

| Reverse dynamic impedance

(3)

∞

(3)

∞

-40 °C < T < +105 °C 1

= 10 mA

I

K

Vka = 24 to 2.5 V

0.3 2 mV/V

T = 25 °C 0.5 2.5

-40 °C < T < +105 °C 3

-40 °C < T < +105 °C 0.4 1.2 µA

= GND 10 500 nA

REF

V

= V

K

REF

ΔIK = 1 to 50 mA,

0.5 0.75 W

f < 10 kHz

= 10 mA

I

E

N

Wide band noise

K

10 Hz < f < 10 kHz

300 nV/√Hz

V

mV-40 °C < T < +85 °C 17 30

mA

µA

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

|ΔV

2.

3. Refer to

| is defined as the difference between the maximum and minimum values of V

REF

range.

Figure 4: Test circuit for Vka = Vref on page 5

.

obtained over the full temperature

REF

4/11 Doc ID 7961 Rev 3