TS3431
Datasheet
1.24 V adjustable shunt voltage reference
3
2
1
SOT23-3L
(Plastic micropackage)
Features
•
•
•
•
•
Adjustable output voltage: 1.24 to 24 V
Several precision levels @ 25 °C ± 2%, ± 1%, ± 0.5% and ± 0.25%
Sink current capability: 0.4 to 100 mA
Industrial temperature range: - 40 °C to + 105 °C
Performance compatible with industry standard TL431
Reference
1
TS3431
3
Anode
Applications
•
•
•
•
•
Computers
Instrumentation
Battery chargers
Switch mode power supply
Battery operated equipment
Cathode
2
SOT23-3L
(top view)
Description
The
TS3431
is an adjustable shunt voltage reference with guaranteed temperature
stability over the entire operating temperature range (- 40 °C to + 125 °C). The output
voltage can be set to any value between 1.24 V and 24 V with an external resistor
bridge.
Available in SOT23-3 surface mount package, it can be used in application designs
where space saving is critical.
Maturity status link
TS3431
DS3673
-
Rev 7
-
May 2019
For further information contact your local STMicroelectronics sales office.
www.st.com
TS3431
Diagram
1
Diagram
Figure 1.
Block diagram
Cathode
Reference
+
-
V
REF
Anode
DS3673
-
Rev 7
page 2/18
TS3431
Maximum ratings
2
Maximum ratings
Table 1.
Absolute maximum ratings
Symbol
V
ka
I
K
I
REF
P
d
T
stg
ESD
T
LEAD
Cathode to anode voltage
Reverse breakdown current
Reference input current range
Power dissipation SOT23-3L
(1)
.
Storage temperature
Human body model (HBM)
Machine model (MM)
Lead temperature (soldering, 10 seconds)
Parameter
Value
25
-100 to +150
0.05 to +10
360
-65 to +150
2
200
250
Unit
V
mA
mA
mW
°C
kV
V
°C
1. P
d
is calculated with T
amb
= 25 °C, T
j
= 150 °C, R
thjc
= 110 °C/W, R
thja
= 340 °C/W
Table 2.
Operating conditions
Symbol
I
K
V
K
T
oper
Cathode operating current
Cathode operating voltage
Operating free air temperature range
Parameter
Value
0.5 to 100
1.24 to 24
- 40 to + 105
Unit
mA
V
°C
DS3673
-
Rev 7
page 3/18
TS3431
Electrical characteristics
3
Electrical characteristics
Limits are 100% production tested at 25 °C. Behavior at the temperature range limits is guaranteed through
correlation and by design. T
amb
= 25 °C (unless otherwise specified).
Table 3.
Electrical characteristics
Symbol
Parameter
Test conditions
TS3431 (2%)
V
K
Reference input voltage I
K
= 10 mA, V
KA
= V
ref
TS3431A (1%)
TS3431B (0.5%)
TS3431C (0.25%)
Variation of reference input voltage over temperature,
V
ka
= V
ref
Temperature coefficient
Minimum operating current
0 °C < T < +70 °C
-40 °C < T < +105 °C
-40 °C < T < +125 °C
-40 °C < T < +125 °C
T = 25 °C
-40 °C < T < +125 °C
I
K
= 10 mA
Ratio of change in reference input voltage to change in
cathode to anode voltage
Reference input current
I
K
= 10 mA, R1 = 10 kΩ, R2 = + ∞
Reference input current deviation
I
K
= 10 mA, R1 = 10 kΩ, R2 = + ∞
V
K
= 24 to 1.24 V
-40 °C < T < +125 °C
T = 25 °C
-40 °C < T < +125 °C
0 °C < T < +70 °C
-40 °C < T < +125 °C
T=25 °C
I
OFF
Off-state cathode current V
K
= 24 V
-40°C < T < +105 °C
-40°C < T < +125 °C
R
KA
EN
Reverse static impedance
Wideband noise
I
K
= 1 to 100 mA
I
K
= 10 mA
1 kHz < f < 100 kHz
0.2
100
0.5
0.9
35
1.5
1.2
0.35
Min.
1.215
1.228
1.234
1.237
1.24
Typ. Max.
1.265
1.252
1.246
1.243
10
18
21
100
0.4
0.5
1.5
2
2.0
2.5
1
1.5
500
1000
2000
0.4
Ω
nV/√Hz
nA
µA
ppm/°C
mA
mV
V
Unit
ΔV
K
T
C
I
Kmin
ΔVref
ΔVka
I
REF
mV/V
ΔI
REF
µA
DS3673
-
Rev 7
page 4/18
TS3431
Performance characteristics
3.1
Performance characteristics
Figure 2.
Reference voltage vs. temperature
Figure 3.
Test circuit for V
K
= V
ref
1.250
Voltage Reference (V)
Input
Ik
I
K
= 10mA
V
K
= V
REF
Output
1.245
1.240
Vka
1.235
1.230
-40
0
40
Temperature (°C)
80
120
Vref
Figure 4.
Cathode voltage vs. cathode current
1.5
Cathode voltage V
K
(V)
Figure 5.
Minimum operating current vs. temperature
0.5
I
KMIN
(mA)
Minimum operating current
T=-40°C
1.0
0.4
0.3
V
K
= V
REF
0.2
0.5
T=+25°C
T=+125°C
0.1
0.0
0.0
0.1
0.2
Cathode current I
K
(mA)
0.3
0.4
0.0
-40
0
40
Temperature (°C)
80
120
DS3673
-
Rev 7
page 5/18
