TS3431
1.24V Programmable Shunt Voltage Reference
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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
L
SOT23-3L
(Plastic Micropackage)
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.
Available in SOT23-3 surface mount package, it
can be designed in applications where space
saving is a critical issue.
Z
TO-92
(Plastic Package)
Pin Connections (top view)
TO-92
(top view)
Applications
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Computers
Instrumentation
Battery chargers
Switch mode power supply
Battery operated equipments
SOT23-3
(top view)
Reference
1
TS3431
3
Anode
Cathode
2
Order Codes
Part Number
TS3431ILT/AILT/BILT/CILT
TS3431IZ/AIZ/BIZ/CIZ
TS3431IZT/AIZT/BIZT/CIZT
TS3431IZ-AP/AIZ-AP/BIZ-AP/CIZ-AP
-40, +125°C
TO-92
Temperature Range
Package
SOT23-3L
Packaging
Tape & Reel
Bulk
Tape & Reel
Ammo pack
Marking
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
V
KA
I
K
I
REF
P
D
T
std
ESD
Tlead
Cathode to Anode Voltage
Reverse Breakdown Current
Reference Current
Power Dissipation
1
Storage Temperature
Human Body Model (HBM)
Machine Model (MM)
Lead Temperature (soldering, 10 seconds)
SOT23-3
TO92
Parameter
Value
25
-100 to +150
-0.05 to10
360
625
-65 to +150
2
200
250
Rthjc = 66°C/W, Rthja = 200°C/W for the TO92 package
Rthjc = 110°C/W, Rthja = 340°C/W for the SOT23-3L package
Unit
V
mA
mA
mW
°C
kV
V
°C
1) Pd has been calculated with T
amb
= 25°C and T
j
= 150°C and
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 +125
Unit
mA
V
°C
2/11
Electrical Characteristics
TS3431
2 Electrical Characteristics
Table 3. Tamb = 25°C (unless otherwise specified)
Symbol
Parameter
Reference input voltage I
K
=
10
mA
V
K
Test Condition
TS3431 (2%)
TS3431A (1%)
TS3431B (0.5%)
TS3431C (0.25%)
Variation of reference input voltage over 0°C < T < +70°C
temperature
-40°C < T < +105°C
-40°C < T < +125°C
T
C
I
KMIN
Temperature coefficient
Minimum Operating Current
-40°C < T < +125°C
T = 25°C
-40°C < T < +125°C
Ratio of change in reference input volt- I
K
=10mA
age to change in cathode to anode volt- V
K
= 24 to 1.24V
age
-40°C < T < +125°C
Reference input current
I
K
=10mA, R1=10K
Ω,
R2=+
∞
Reference input current deviation
I
K
=10mA, R1=10K
Ω,
R2=+
Off-state cathode current V
K
=24V
I
OFF
R
KA
E
N
Reverse Static Impedance
Wideband Noise
T=25°C
-40°C < T < +125°C
0°C < T < +70°C
-40°C < T < +125°C
T=25°C
-40°C < T < +105°C
-40°C < T < +125°C
I
K
= 1 to 100mA
I
K
=
10
mA
1kHz < f < 100kHz
0.2
100
0.5
0.9
35
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
0.9
1.5
2
1
1.5
500
1000
2000
0.4
nA
µA
µA
ppm/°C
mA
mV
V
Unit
∆
V
K
∆Vref
---------------
-
∆Vka
I
REF
mV/V
∆
I
REF
Ω
nV/
√
Hz
Note:
Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation and by design.
3/11
TS3431
Figure 1. Reference voltage vs. temperature
Electrical Characteristics
Figure 4. Test circuit for V
K
= Vref
1.250
Voltage Reference (V)
Input
1.245
Output
Ik
1.240
I
K
= 10mA
V
K
= V
REF
Vka
1.235
Vref
1.230
-40
0
40
80
120
Temperature (°C)
Figure 2. Cathode voltage vs cathode current
Figure 5. Minimum operating current vs
temperature
I
KMIN
(mA)
Minimum operating current
0.5
1.5
Cathode voltage V
K
(V)
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
0.3
0.4
0.0
-40
0
40
80
120
Cathode current I
K
(mA)
Temperature (°C)
Figure 3. Reference input current vs
temperature
1.00
Figure 6. Dynamic impedance vs frequency
0.5
Reference current I
REF
(µA)
Dynamic impedance Z
KA
(
Ω
)
0.75
0.4
V
K
= V
REF
T=+25°C
0.3
0.50
0.2
0.25
0.1
0.00
-40
0
40
80
120
0.0
10
100
1000
10000
Temperature (°C)
Frequency (Hz)
4/11
Electrical Characteristics
Figure 7. Off-State current vs temperature
TS3431
Figure 10. Test circuit for off-state current
measurement
300
OFF State Current I
OFF
(nA)
Vka=24V
200
Ioff
100
0
-40
0
40
80
120
Temperature (°C)
Figure 8. Ratio of change in reference input
voltage to change in Vka voltage vs
temperature
2.0
Figure 11. Test circuit for V
K
> V
REF
Input
(mV/V)
1.5
Vka
Ik
R1
Iref
∆
V
REF
/
∆
V
K
1.0
0.5
∆
V
K
= 1.24 to 24V
I
K
= 10 mA
R2
Vref
0.0
-40
0
40
80
120
Temperature (°C)
Vka = Vref . (1+R1/R2) + Iref . R1
Figure 9. Phase and gain vs frequency
Figure 12. Test circuit for phase and gain
measurement
80
10 µF
Phase (°)
40
Gain (dB)
T = +25°C
Intput
0
1000
10000
100000
1000000
Frequency (Hz)
4.3 K
Ω
20
Output
5/11
0
40
10 µF
I
K
=10mA
6.8 K
Ω
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