TS431
Low voltage adjustable shunt reference
Features
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■
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Low voltage operation: 1.24 to 6V
2%, 1% and 0.5% voltage precision
Wide operating range cathode current: 60µA to
30mA
Low output impedance: 0.2Ω
Typically stable for any capacitive loads
ESD protection:
– Human body model: 2kV
– Machine model: 200V
100ppm/°C temperature coefficient
Z
TO92
(Plastic package)
■
Description
The TS431 is a low-voltage, three-terminal,
programmable shunt voltage reference.
The output voltage can be set to any value
between V
ref
(1.24V) and 6V with two external
resistors.
The TS431 is able to operate at a lower voltage
(1.24V) 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 3.3V switching
power supplies.
L
SOT23-5
(Plastic micropackage)
August 2007
Rev 6
1/12
www.st.com
12
Absolute maximum ratings and operating conditions
TS431
1
Absolute maximum ratings and operating conditions
Table 1.
Symbol
V
KA
I
k
I
ref
P
d
T
stg
Absolute maximum ratings
Parameter
Cathode to anode voltage
Continuous cathode current range
Reference input current range
Power dissipation
(1)
TO92 package
SOT23-5 package
Storage temperature range
Value
10
-20 to +40
-0.05 to +3
625
500
-65 to +150
Unit
V
mA
mA
mW
°C
1. T
junction
=150°C, T
amb
=25°C with
R
THj-a
=200°C/W for TO92 package and
R
THj-a
=250°C/W for SOT23-5L package
Table 2.
Symbol
V
KA
I
k
T
oper
Operating conditions
Parameter
Cathode to anode voltage
Cathode current
Operating free air temperature range
Value
1.24 to 6
0.06 to 30
-40 to +125
Unit
V
mA
°C
2/12
TS431
Electrical characteristics
2
Table 3.
Symbol
V
ref
Electrical characteristics
T
amb
= 25°C (unless otherwise specified)
Parameter
Output voltage
V
KA
= V
ref
@ I
k
= 100μA
Output voltage change
(1) (2)
I
k
= 100μA, V
KA
= V
ref
Test conditions
TS431
TS431A
TS431B
0 < T
amb
< +70°C
-40 < T
amb
< +85°C
-40 < T
amb
< +105°C
-40 < T
amb
< +125°C
1.8
70
70
90
40
0.001
0.2
Min.
1.215
1.228
1.234
Typ.
1.240
Max.
1.265
1.252
1.246
9
16
18
21
2.7
160
160
240
60
0.1
0.4
Unit
V
ΔV
ref
mV
ΔVref
---------------
-
ΔVka
Ratio of change in reference input
I
k
= 10mA
voltage to change in cathode to
V
KA
= 6V to V
ref
anode voltage
Reference input current
Reference input current deviation
over temperature range
Minimum cathode current for
regulation
Off-state cathode current
Static impedance
I
k
= 10mA
I
k
=10mA, R
1
=10kΩ, R
2
=∝
-40 < T
amb
< +85°C
-40 < T
amb
< +125°C
V
KA
= V
ref
V
KA
= 6V, V
ref
= 0
V
KA
= V
ref
, I
k
= 0.1 to 15mA
mV/V
nA
nA
I
ref
ΔI
ref
I
min
I
off
R
KA
μA
μA
Ω
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.
Definition of output voltage change over temperature range
ΔV
ref
is defined as the difference between the maximum and minimum values obtained over
the full temperature range.
ΔV
ref
= V
ref max
- V
ref min
Figure 1.
Output voltage change over temperature range
Vref m ax.
Vref m in .
T1
T2
T e m p e ra tu re
3/12
Electrical characteristics
TS431
Figure 2.
1.252
Reference voltage vs. temperature
Figure 3.
Input
Test circuit for V
KA
= V
ref
Output
Ik
1.248
Reference voltage (V)
Vka = Vref
Ik = 100 µA
1.244
1.24
Vka
1.236
1.232
1.228
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Vref
Figure 4.
15
Cathode voltage vs. cathode
current
Figure 5.
1.5
Cathode voltage vs. cathode
current
10
Ika Cathode current (mA)
Vka Cathode voltage (V)
Vka = Vref
T = 25°C
5
1
0
-5
0.5
+125°C
-40°C
+25°C
+85°C
-10
-15
-1
-0.5
0
0.5
1
1.5
Vka Cathode voltage (V)
0
0
10
20
30
40
50
60
Ika Cathode current (µA)
Figure 6.
100
Reference input current vs.
temperature
Figure 7.
0.4
Static impedance vs. temperature
Iref Reference current (nA)
80
Rka Static Impedance (Ohms)
Ik = 10mA
R1 = 10 KΩ
R2 = +
∞
0.3
60
Vka = Vref
Ik = 100µA to 15mA
0.2
40
0.1
20
0
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
0
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
4/12
TS431
Electrical characteristics
Figure 8.
200
Off-state current vs. temperature
Figure 9.
Test circuit for off-state current
measurement
Vka=6V
Ioff
Input
IOff Off-State current (nA)
150
100
50
0
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Figure 10. Ratio of change in reference input
voltage to change in V
KA
voltage
vs. temperature
Ratio of change in reference input voltage (mV/V)
0
Figure 11. Test circuit for V
KA
> V
ref
Input
Vka
Ik
-1
R1
Iref
Ik = 10mA
Vka = 6V to Vref
-2
R2
Vref
-3
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Vka = Vref . (1+R1/R2) + Iref . R1
Figure 12. Phase and gain vs. frequency
60
150
Figure 13. Test circuit for phase and gain
measurement
Phase
50
100
10µF
Output
Ik=100µA
40
Gain (dB)
50
30
Phase margin # 50°
0
Phase (°)
6.8K
10µF
20
-50
Gain
10
0
1E+3
Input
-100
-150
1E+6
4.3K
Vref
1E+4
1E+5
Frequency (Hz)
5/12
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