Page 1
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
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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
Page 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
Page 4
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
Page 5
TS2431 Electrical characteristics
Figure 1. Reference voltage vs. temperature Figure 2. Cathode voltage vs. cathode
current
2.52
2.51
2.50
Voltage reference (V)
2.49
2.48
-40-200 20406080100
Temperatur e (°C)
Ik =10 mA
Vka = Vref
Figure 3. Reference input current vs.
Figure 4. Test circuit for Vka = Vref
3
2
1
0
Vka Cathod e voltage (V)
-1
-0.10 -0.05 0.00 0.05 0.10
Ika Cathode current (A)
Vka = Vref
T=25°C
temperature
1.00
0.75
Ik=10mA
R1=10K
R2=+∞
Ω
Input
Ik
Output
0.50
Reference input current (µA)
0.25
0.00
-40-200 20406080100
Temperatur e (°C)
Figure 5. Cathode voltage vs. cathode
current
3
T=-40°C
2
1
Vka Cathode voltage (V)
T=+105°C
0
0 100 200 300 400
T=+25°C
Vka = Vref
Ik Cathode current (µA)
Vka
Vref
Figure 6. Dynamic impedance vs. frequency
5
4
3
2
Zka Dynamic impedance (Ohms )
1
0
10 100 1000 10000 100000 1000000
Vka=Vref
Ik=1mA
T=25°C
Frequency (Hz)
Doc ID 7961 Rev 3 5/11
Page 6
Electrical characteristics TS2431
Figure 7. Off-state current vs. temperature Figure 8. Ratio of change in reference input
voltage to change in Vka voltage vs.
temperature
0.3
0.2
Off-state current (µA)
0.1
0.0
-40-20 0 20406080100
Temperatur e (°C)
0.4
0.3
0.2
ΔVref / ΔVka (mV/V)
0.1
0.0
-40-20 0 20406080100
Temperatur e (°C)
ΔVka=24 to 2.5V
Ik=10mA
T=25°C
Figure 9. Phase and gain vs. frequency Figure 10. Test circuit for off-state current
measurement
Vka=24V
Ioff
Figure 11. Test circuit for Vka > Vref Figure 12. Test circuit for phase and gain
measurement
Input
R1
R2
Iref
Vref
Vka = Vref . (1+R1/R2) + Iref . R1
Ik
Vka
6/11 Doc ID 7961 Rev 3
Page 7
TS2431 Electrical characteristics
Figure 13. Pulse response at Ik = 0 to 1 mA Figure 14. Pulse response at Ik = 1 to 0 mA
6
4
Voltage (V)
2
0
0.0 0.5 1.0 1.5 2.0
Input voltage
Output vol tage
Time (µs)
Ik= 0 to 1mA
T=25°C
6
Input voltage
4
Ik= 1mA to 0
T=25°C
Voltage (V)
2
0
0.00.51.01.52.0
Output voltage
Time (µs)
Figure 15. Stability boundary conditions Figure 16. Test circuit for pulse response at
Ik = 1 mA
100
80
60
Vka=3 V
40
Cathode curr ent (mA)
20
Vka=2.5 V
0
1E-10 1E-9 1E-8 1E-7 1E-6 1E-5
Instable
area
Capacitive load (F)
Stable
area
Vka=5 V
Pulse
Generator
F=100kHz
0 to 5V
Intput
2.5 K
Ω
Ik=1mA
Output
Figure 17. Equivalent input noise vs.
frequency
300
250
200
150
100
Noise (nV / √ Hz)
50
0
0.1 1 10 100 1000
Vka=Vref
Ik=1mA
T=25°C
Frequency (KHz)
Figure 18. Block diagram
Doc ID 7961 Rev 3 7/11
Page 8
Package mechanical data TS2431
3 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at:
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
www.st.com
.
8/11 Doc ID 7961 Rev 3
Page 9
TS2431 Package mechanical data
3.1 SOT23-3L package information
Figure 19. SOT23-3L package mechanical drawing
Table 5. SOT23-3L package mechanical data
Dimensions
Millimeters Inches
Ref.
Min. Typ. Max. Min. Typ. Max.
A 0.89 1.12 0.035 0.044
A1 0.01 0.10 0.0004 0.004
A2 0.88 0.95 1.02 0.035 0.037 0.040
b 0.30 0.50 0.012 0.020
c 0.08 0.20 0.003 0.008
D 2.80 2.90 3.04 0.110 0.114 0.120
E 2.10 2.64 0.083 0.104
E1 1.20 1.30 1.40 0.047 0.051 0.055
e 0.95 0.037
e1 1.90 0.075
L 0.40 0.50 0.60 0.016 0.020 0.024
L1 0.54 0.021
k0d 8d
Doc ID 7961 Rev 3 9/11
Page 10
Revision history TS2431
4 Revision history
Table 6. Document revision history
Date Revision Changes
01-Feb-2002 1 Initial release.
Updated document format.
10-Sep-2009 2
Modified footnote 1 under
on page 3
Added HBM and MM notes under
.
Table 2: Absolute maximum ratings
Ta bl e 2
.
11-May-2012 3 Removed: automotive grade order codes
Table 1 on page 1
.
10/11 Doc ID 7961 Rev 3
Page 11
TS2431
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Doc ID 7961 Rev 3 11/11
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