TS3431
1.24V programmable shunt voltage reference
Features
Adjustable output voltage: 1.24 to 24V Several precision levels @ 25C 2%, 1%, 0.5% and 0.25% Sink current capability: 0.4 to 100mA Industrial temperature range: -40C to +125C Performance compatible with industry standard TL431 L SOT23-3L (Plastic micropackage)
Applications
Computers Instrumentation Battery chargers Switch mode power supply Battery operated equipment
Reference
SOT23-3 (top view)
1
TS3431
Description
The TS3431 is a programmable shunt voltage reference with guaranteed temperature stability over the entire operating temperature range (-40C to +125C). 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.
Cathode
3
Anode
2
June 2007
Rev 3
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Block diagram
TS3431
1
Block diagram
Figure 1. Block diagram
Cathode
Reference
+ -
VREF
Anode
2
Absolute maximum ratings
Table 1.
Symbol VKA IK IREF Pd Tstg ESD Machine model (MM) Tlead Lead temperature (soldering, 10 seconds) 200 250 V C
Absolute maximum ratings (AMR)
Parameter Cathode to anode voltage Reverse breakdown current Reference current Power dissipation (1)SOT23-3L Storage temperature Human body model (HBM) Value 25 -100 to +150 -0.05 to10 360 -65 to +150 2 Unit V mA mA mW C kV
1. Pd is calculated with Tamb = 25C, Tj = 150C, Rthjc = 110C/W, Rthja = 340C/W.
Table 2.
Symbol IK VK Toper
Operating conditions
Parameter Cathode operating current Cathode operating voltage Operating free air temperature range Value 0.5 to 100 1.24 to 24 -40 to +125 Unit mA V C
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TS3431
Electrical characteristics
3
Table 3.
Symbol
Electrical characteristics
Tamb = 25C (unless otherwise specified)(1)
Parameter Test conditions TS3431 (2%) TS3431A (1%) VK Reference input voltage IK = 10mA TS3431B (0.5%) TS3431C (0.25%) 0C < T < +70C VK Variation of reference input voltage over temperature Temperature coefficient Minimum operating current -40C < T < +125C IK=10mA Ratio of change in reference input voltage to change in cathode to anode VK= 24 to 1.24V voltage -40C < T < +125C Reference input current IK=10mA, R1=10K, R2=+ Reference input current deviation IK=10mA, R1=10K, R2=+ T= 25C -40C < T < +125C 0C < T < +70C -40C < T < +125C T= 25C IOFF Off-state cathode current VK=24V -40C < T < +105C -40C < T < +125C RKA EN Reverse static impedance Wideband noise IK = 1 to 100mA IK = 10mA 1kHz < f < 100kHz 0.2 100 0.5 0.9 35 1.2 0.5 1.5 mV/V 2 0.9 1.5 A 2 1 A 1.5 500 1000 2000 0.4 W nV/ Hz nA -40C < T < +105C -40C < T < +125C TC IKmin -40C < T < +125C T = 25C 0.35 Min. 1.215 1.228 1.24 1.234 1.237 1.246 1.243 10 18 21 100 0.4 mA ppm/C mV Typ. Max. 1.265 1.252 V Unit
-V------------- r e f Vka IREF IREF
1. Limits are 100% production tested at 25C. Behavior at the temperature range limits is guaranteed through correlation and by design.
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Electrical characteristics
TS3431
Figure 2.
1.250
Voltage Reference (V)
Reference voltage vs. temperature
Figure 3.
Test circuit for VK = Vref
Input
1.245
Output Ik
1.240
IK = 10mA VK = VREF
Vka
1.235
Vref
1.230 -40 0 40
Temperature (C)
80
120
Figure 4.
Cathode voltage vs cathode current Figure 5.
Minimum operating current vs temperature
Cathode voltage VK (V)
IKMIN (mA) M inimum operating current
1.5
0.5
T=-40C 1.0
0.4
0.3 VK = VREF 0.2
0.5
T=+25C
T=+125C
0.1
0.0 0.0
0 .1
0.2
Cathode current IK (mA)
0 .3
0.4
0.0 -40
0
40
Temperature (C)
80
120
Figure 6.
Reference input current vs temperature
Figure 7.
Dynamic impedance vs frequency
1.00
Reference current IREF (A) Dynamic impedance ZKA ()
0.5 VK = VREF T=+25C
0.4
0.75
0.3
0.50
0.2
0.25
0.1
0.00 -40
0
40
Temperature (C)
80
120
0.0 10
100
1000
10000
Frequency (Hz)
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TS3431
Electrical characteristics
Figure 8.
Off-state current vs temperature
Figure 9.
Test circuit for off-state current measurement
300
OFF State Current IOFF (nA)
Vka=24V
200
Ioff
100
0 -40
0
40
Temperature (C)
80
120
Figure 10. Ratio of change in reference input Figure 11. Test circuit for VK > VREF voltage to change in VKA voltage vs temperature
2.0
Input
Vka
Ik
(mV/V)
1.5
R1 Iref
1.0
VREF / VK
0.5
VK = 1.24 to 24V IK = 10 mA
R2
Vref
0.0 -40
0
40
Temperature (C)
80
120
Vka = Vref . (1+R1/R2) + Iref . R1
Figure 12. Pulse response at IK=1mA
Figure 13. Test circuit for pulse response at IK = 1mA
5.0 Input Voltage ...
Voltage (V)
T=+25C
2.7K
IK=1mA
4V
Output voltage ...
0
0.0
0
2
4
Time (s)
6
8
Output
Intput
2.5
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Electrical characteristics
TS3431
Figure 14. Pulse response at IK = 10mA
Figure 15. Test circuit for pulse response at IK = 10mA
5.0 Input Voltage ...
Voltage (V)
T=+25C
270
IK=10mA
4V
Output voltage ...
0
0.0
0
2
4
Time (s)
6
8
Figure 16. Phase and gain vs frequency
Figure 17. Equivalent input noise vs frequency
300 VK = VREF IK = 10 mA T = +25C 200
80
Phase ()
40
Noise (nV / Hz)
0 40
Gain (dB)
T = +25C 20
100
0 1000
10000
10 0 0
10 0 00
0 0.1
1
10
100
1000
10000
Frequency (Hz)
Frequency (kHz)
Figure 18. Test circuit for phase and gain measurement
10 F
Intput
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4.3 K
Output
10 F
IK=10mA
6.8 K
Output
Intput
2.5
TS3431
Package information
4
Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com.
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Package information Figure 19. SOT23-3L package mechanical data
Dimensions Ref. Min. A A1 A2 b C D E E1 e e1 L L1 k 0 0.400 0.540 8 0 0.890 0.010 0.880 0.300 0.080 2.800 2.100 1.200 1.300 0.950 1.900 0.600 15.75 21.27 2.900 0.950 Millimeters Typ. Max. 1.120 0.100 1.020 0.500 0.200 3.040 2.64 1.400 Min. 35.05 0.39 34.65 11.81 3.15 110.26 82.70 47.26 51.19 37.41 74.82 114.17 37.41 Mils Typ.
TS3431
Max. 44.12 3.94 40.17 19.69 7.88 119.72 103.96 55.13
23.63
8
7110469/A
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TS3431
Ordering information
5
Ordering information
Table 4.
s
Order codes
Part number Temperature range Package Packaging Marking L280 L281 L282 L283
TS3431ILT TS3431AILT TS3431BILT TS3431CILT
-40C, +125C
SOT23-3L
Tape & reel
6
Revision history
Date 1-Jan-2004 Revision 1 Initial release. Specific content changes as follows: CI version added in Table 4: Order codes. Rthjc information added in Table 1: Absolute maximum ratings (AMR). Test condition added in electrical characteristics Table 3. Removed TO-92 package information and associated order codes. Re-ordered electrical characteristics figures. Changes
1-Dec-2004
2
26-Jun-2007
3
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TS3431
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