June 2007 Rev 3 1/10
10
TS3431
1.24V programmable shunt voltage reference
Features
■Adjustable output voltage: 1.24 to 24V
■Several precision levels @ 25°C
±2%, ±1%, ±0.5% and ±0.25%
■Sink current capability: 0.4 to 100mA
■Industrial temperature range: -40°C t o +125°C
■Performance compatible with ind ustry
standard TL431
Applications
■Computers
■Instrumentation
■Battery chargers
■Switch mode power supply
■Battery operated equipment
Description
The TS3431 is a programmable shunt voltage
reference with guaranteed temperature stability
over the entire operat ing temperature range
(-40°C to +125°C). The output voltage can 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 used in application designs where space
saving is critical.
L
SOT23-3L
(Plastic micropackage)
SOT23-3
(top view)
3
1
2
Cathode
Reference
Anode
TS3431
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Block diagram TS3431
2/10
1 Block diagram
Figure 1. Block diagram
2 Absolute maximum ratings
VREF
Anode
Cathode
Reference +
-
Table 1. Absolute maxim um ratings (AMR)
Symbol Parameter Value Unit
VKA Cathode to anode voltage 25 V
IKReverse breakdo w n cu rre nt -100 to +150 mA
IREF Ref e rence current -0.05 to10 mA
PdPower dissipation (1)SOT23-3L
1. Pd is calculated with Tamb = 25°C, Tj = 150°C, Rthjc = 110°C/W, R thja = 340°C/W.
360 mW
Tstg Storage temperature -65 to +150 °C
ESD Human body model (HBM) 2 kV
Machine model (MM) 200 V
Tlead Lead temperature (soldering, 10 seconds) 250 °C
Table 2. Operating conditions
Symbol Parameter Value Unit
IKCathode operating current 0.5 to 100 mA
VKCathode operating voltage 1.24 to 24 V
Toper Operating free air temperature range -40 to +125 °C
TS3431 Electrical character is tics
3/10
3 Electrical characteristics
Table 3. Tamb = 25°C (unless otherw ise specified)(1)
Symbol Parameter Test conditions Min. Typ. Max. Unit
VKRef erence input voltage IK = 10mA
TS3431 (2%) 1.215
1.24
1.265
V
TS3431A (1%) 1.228 1.252
TS3431B (0.5%) 1.234 1.246
TS3431C (0.25%) 1.237 1.243
ΔVKVariation of reference input voltage
over temperature
0°C < T < +70°C 10
mV-40°C < T < +105°C 18
-40°C < T < +125°C 21
TCTemperature coefficient -40°C < T < +125°C 100 ppm/°C
IKmin Minimum operating current T = 25°C 0.35 0.4 mA
-40°C < T < +125°C 0.5
Ratio of change in reference input
voltage to change in cathode to anode
voltage
IK=10mA
VK= 24 to 1.24V 1.2 1.5 mV/V
-40°C < T < +125°C 2
IREF Reference input current
IK=10mA, R1=10KΩ, R2=+ T= 25°C 0.9 1.5 µA
-40°C < T < +125°C 2
ΔIREF Reference input current deviation
IK=10mA, R1=10KΩ, R2=+ 0°C < T < +70°C 0.5 1 µA
-40°C < T < +125°C 0.9 1.5
IOFF Off-state cathode current VK=24V
T= 25°C 35 500
nA-40°C < T < +105°C 1000
-40°C < T < +125°C 2000
RKA Reverse static impedance IK = 1 to 100mA 0.2 0.4 W
ENWideband noise IK = 10mA
1kHz < f < 100kHz 100 nV/√ Hz
1. Limits are 100% production tested at 25°C. Behavior at the temperature range limits is guaranteed through correlation and
by design.
ΔVref
ΔVka
----------------
∞
Electrical characteristics TS3431
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Figure 2. Refere nce voltage vs. temperature Figure 3. Test circuit for VK = Vref
-40 0 40 80 120
1.230
1.235
1.240
1.245
1.250
IK = 10mA
VK = VREF
Voltage Reference (V)
Temperature (°C)
Input
Vka
Vref
Ik
Output
Figure 4. Cathode voltage vs cathode current Figure 5. Minimum operating current vs
temperature
0.0 0.1 0.2 0.3 0.4
0.0
0.5
1.0
1.5
T=+125°C
T=+25°C
T=-40°C
Cathode voltage VK (V)
Cathode current IK (mA)
-40 0 40 80 120
0.0
0.1
0.2
0.3
0.4
0.5
VK = VREF
Minimum operating current IKMIN (mA)
Temperature (°C)
Figure 6. Reference input current vs
temperature Figur e 7. Dynamic impedan ce vs frequency
-40 0 40 80 120
0.00
0.25
0.50
0.75
1.00
Reference current IREF (µA)
Temperature (°C)
10 100 1000 10000
0.0
0.1
0.2
0.3
0.4
0.5
VK = VREF
T=+25°C
Dynamic impedance ZKA (Ω)
Frequency (Hz)
TS3431 Electrical character is tics
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Figure 8. Off-state current vs temperature Figure 9. Test circuit for off-state current
measurement
-40 0 40 80 120
0
100
200
300
OFF State Current IOFF (nA)
Temperature (°C)
Vka=24V
Iof
f
Figure 10. Ratio of change in reference input
voltage to change in VKA voltage vs
temperature
Figure 11. Test circuit for VK > VREF
-40 0 40 80 120
0.0
0.5
1.0
1.5
2.0
ΔVK = 1.24 to 24V
IK = 10 mA
ΔVREF / ΔVK (mV/V)
Temperature (°C)
Input
Ik
Vka = Vref . (1+R1/R2) + Iref . R1
Vka
R1
R2
Iref
Vref
Figure 12. Pulse response at IK=1mA Figure 13. Test circuit for pulse response at
IK=1mA
02468
0.0
2.5
5.0
. . .
. . .
T=+25°C
Output voltage
Input Voltage
Voltage (V)
Time (µs)
IK=1mA
Output
2.7K Ω
Intput
0
4V
Electrical characteristics TS3431
6/10
Figure 14. Pulse response at IK = 10mA Figure 15. Test circuit for pulse response at
IK= 10mA
02468
0.0
2.5
5.0 T=+25°C
Output voltage
Input Voltage
. . .
. . .
Voltage (V)
Time (µs)
IK=10mA
Output
270 Ω
Intput
0
4V
Figure 16. Phase and gain vs frequency Figure 17. Equivalent input nois e vs
frequency
Figure 18. Test circuit for phase and gain
measurement
1000 10000 100000 1000000
0
20
40
0
40
80
T = +25°C
Gain (dB)
Freque ncy (Hz)
Phase (°)
0.1 1 10 100 1000 10000
0
100
200
300
VK = VREF
IK = 10 mA
T = +25°C
Noise (nV / √ Hz)
Frequency (kHz)
IK=10mA
Output
4.3 K Ω
Intput
6.8 K Ω
10 µF
10 µF
TS3431 Package information
7/10
4 Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in
ECOPACK® packages. These packages have a lead-free second level int erconnect. The
category of second level inte rconnect is marke d on the pa ckage and on the inner box label,
in compliance with JEDEC Standard JESD97. The maximum ratings rela ted to soldering
conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics
tradem ark. ECOPACK spe cif ications are available at: www.st.com.
Package information TS3431
8/10
Figure 19. SOT23-3L pac k age mechanical data
Ref.
Dimensions
Millimeters Mils
Min. Typ. Max. Min. Typ. Max.
A 0.890 1.120 35.05 44.12
A1 0.010 0.100 0.39 3.94
A2 0.880 0.950 1.020 34.65 37.41 40.17
b 0.300 0.500 11.81 19.69
C 0.080 0.200 3.15 7.88
D 2.800 2.900 3.040 110.26 114.17 119.72
E 2.100 2.64 82.70 103.96
E1 1.200 1.300 1.400 47.26 51.19 55.13
e 0.950 37.41
e1 1.900 74.82
L 0.400 0.600 15.75 23.63
L1 0.540 21.27
k0°8°0°8°
7110469/A
TS3431 Ordering information
9/10
5 Ordering information
s
6 Revision history
Table 4. Order codes
Part number Temperature
range Package Packaging Marking
TS3431ILT
TS3431AILT
TS3431BILT
TS3431CILT
-40°C, +125°C SOT23-3L Tape & reel
L280
L281
L282
L283
Date Revision Changes
1-Jan-2004 1 Initial release.
1-Dec-2004 2
Specific content changes as follows:
– CI version added in Table 4: Order codes.
–R
thjc information added in Table 1: Absolute maximum ratings
(AMR).
– Test condition added in electrical characteristics Table 3.
26-Jun-2007 3 Removed TO-92 package information and associated order code s.
Re-ordered electrical characteristics figures.
TS3431
10/10
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