ST TS3431 User Manual
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1.24V Programmable Shunt Voltage Reference
■ 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
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.
TS3431
L
SOT23-3L
(Plastic Micropackage)
Z
TO-92
(Plastic Package)
Pin Connections (top view)
Available in SOT23-3 surface mount package, it
can be designed in applications where space
saving is a critical issue.
TO-92
(top view)
Applications
■ Computers
■ Instrumentation
■ Battery chargers
■ Switch mode power supply
■ Battery operated equipments
Refe rence
Catho de
SOT23-3
(top view)
1
3
TS3431
2
Order Codes
Part Number Temperature Range Package Packaging Marking
TS3431ILT/AILT/BILT/CILT
TS3431IZ/AIZ/BIZ/CIZ
TS3431IZT/AIZT/BIZT/CIZT Tape & Reel
TS3431IZ-AP/AIZ-AP/BIZ-AP/CIZ-AP Ammo pack
-40, +125°C
SOT23-3L Tape & Reel
Bulk
TO-92
Anode
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 Parameter Value Unit
V
I
T
ESD
Tlead Lead Temperature (soldering, 10 seconds) 250 °C
1) Pd has been calculated with T
Table 2. Operating Conditions
Symbol Parameter Value Unit
T
Cathode to Anode Voltage
KA
I
Reverse Breakdown Current
K
Reference Current
REF
Power Dissipation
P
D
Storage Temperature
std
1
SOT23-3
TO92
25 V
-100 to +150 mA
-0.05 to10 mA
360
625
-65 to +150 °C
Human Body Model (HBM) 2 kV
Machine Model (MM) 200 V
= 25°C and Tj = 150°C and Rthjc = 66°C/W, Rthja = 200°C/W for the TO92 package
amb
I
Cathode Operating Current
K
V
Cathode Operating Voltage
K
Operating Free Air Temperature Range
oper
Rthjc = 110°C/W, Rthja = 340°C/W for the SOT23-3L package
0.5 to 100 mA
1.24 to 24 V
-40 to +125 °C
mW
2/11
Electrical Characteristics TS3431
2 Electrical Characteristics
Table 3. Tamb = 25°C (unless otherwise specified)
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
K
∆V
K
T
C
I
KMIN
∆Vref
----------------
∆Vka
I
REF
∆I
REF
I
OFF
R
KA
E
N
Reference input voltage IK = 10mA TS3431 (2%) 1.215
TS3431A (1%) 1.228 1.252
TS3431B (0.5%) 1.234 1.246
1.24
TS3431C (0.25%) 1.237 1.243
Variation of reference input voltage over
0°C < T < +70°C 10
temperature
-40°C < T < +125°C 21
Temperature coefficient -40°C < T < +125°C
Minimum Operating Current T = 25°C 0.35 0.4
-40°C < T < +125°C 0.5
Ratio of change in reference input voltage to change in cathode to anode voltage
Reference input current
I
=10mA, R1=10KΩ, R2=+
K
∞
Reference input current deviation
I
=10mA, R1=10KΩ, R2=+
K
I
=10mA
K
= 24 to 1.24V
V
K
-40°C < T < +125°C 2
T=25°C 0.9 1.5
-40°C < T < +125°C 2
0°C < T < +70°C 0.5 1
-40°C < T < +125°C 0.9 1.5
Off-state cathode current VK=24V T=25°C 35 500
-40°C < T < +125°C 2000
Reverse Static Impedance IK = 1 to 100mA
Wideband Noise IK = 10mA
1kHz < f < 100kHz
100 nV/
1.265
100 ppm/°C
1.2 1.5
0.2 0.4
V
mV-40°C < T < +105°C 18
mA
mV/V
µA
µA
nA-40°C < T < +105°C 1000
Ω
√Hz
Note: Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation and by design.
3/11
TS3431 Electrical Characteristics
Figure 1. Reference voltage vs. temperature
1.250
1.245
1.240
Voltage Refe rence (V)
1.235
1.230
-40 0 40 80 120
Temperature (° C)
IK = 10mA
V
= V
K
REF
Figure 2. Cathode voltage vs cathode current
1.5
(V)
K
Cathode voltage V
1.0
0.5
T=-4 0°C
T=+25°C
T=+125°C
Figure 4. Test circuit for VK = Vref
Input
Ik
Vref
Output
Vka
Figure 5. Minimum operating current vs
temperature
0.5
(mA)
0.4
KMIN
0.3
VK = V
0.2
0.1
REF
0.0
0.0 0.1 0.2 0.3 0.4
Cathode current IK (mA)
Figure 3. Reference input current vs
temperature
1.00
(µA)
0.75
REF
0.50
0.25
Reference current I
0.00
-40 0 40 80 120
Temperature ( °C)
Minimu m operating current I
0.0
-40 0 40 80 120
Temper ature ( °C)
Figure 6. Dynamic impedance vs frequency
0.5
)
Ω
(
KA
0.4
0.3
0.2
Dynamic imp edance Z
0.1
0.0
10 100 1000 10000
Frequen cy (Hz)
VK = V
T=+25°C
REF
4/11
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