STMICROELECTRONICS TL1431AIDT

TL1431
Programmable voltage reference
Features
■
Adjustable output voltage: VREF to 36 V
■
Sink current capability: 1 to 100 mA
■
Typical output impedance: 0.22 Ω
■
0.4% and 0.25% voltage precision
Description
The TL1431 is a programmable shunt voltage
reference with guaranteed temperature stability
over the entire operating temperature range.
Z
TO92
(Plastic package)
The output voltage may be set to any value
between 2.5 V and 36 V with two external
resistors.
The TL1431 operates with a wide current range
from 1 to 100 mA with a typical dynamic
impedance of 0.2 Ω.
March 2008
D
SO-8
(Batwing plastic micropackage)
Rev 4
1/16
www.st.com
16
Schematic diagrams
1
TL1431
Schematic diagrams
Figure 1.
TO92 pin connections (top view)
Cathode Anode Reference
1
Figure 2.
2
3
SO-8 pin connections (top view)
8
7
6
5
1 - Cathode
2 - Anode
3 - Anode
4 - N.C.
5 - N.C.
6 - Anode
7 - Anode
8 - Reference
1
Figure 3.
2
3
TL1431 block diagram
Cathode
Vref
+
Vref
Anode
2/16
4
TL1431
2
Absolute maximum ratings and operating conditions
Absolute maximum ratings and operating conditions
Table 1.
Absolute maximum ratings
Symbol
VKA
Parameter
Cathode to anode voltage
Value
Unit
37
V
Ik
Continuous cathode current range
-100 to +150
mA
Iref
Reference input current range
-0.05 to +10
mA
Tj
Junction temperature
+150
°C
625
960
mW
(1)
Pd
Power dissipation
TO92
SO-8 batwing
Tstg
Storage temperature range
-65 to +150
°C
HBM: human body model (2)
2000
200
1500
V
ESD
MM: machine model
(3)
CDM: charged device model
(4)
1. Calculated with Tj=+150°C and Tamb=+25°C with relative Rthja depending on the package.
2. Human body model: A 100 pF capacitor is charged to the specified voltage, then discharged through a
1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.
3. Machine model: A 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of
connected pin combinations while the other pins are floating.
4. Charged device model: all pins and the package are charged together to the specified voltage and then
discharged directly to the ground through only one pin. This is done for all pins.
Table 2.
Operating conditions
Symbol
VKA
Ik
Parameter
Value
Unit
Cathode to anode voltage
Vref to 36
V
Cathode current
1 to 100
mA
-20 to +70
-40 to +105
°C
130
200
°C/W
Toper
Operating free-air temperature range
TL1431C/AC
TL1431I/AI
Rthja
Thermal resistance junction to ambient
SO-8 batwing
TO92
3/16
Electrical characteristics
TL1431
3
Electrical characteristics
Table 3.
Tamb = 25°C (unless otherwise specified)
TL1431C
Symbol
TL1431AC
Parameter
Unit
Min.
Typ.
Max.
Min.
Typ.
Max.
Vref
Reference input voltage - see Figure 4
VKA = Vref , Ik = 10 mA
ΔVref
Reference input voltage deviation over
temperature range (1) - see Figure 4
VKA = Vref, Ik = 10 mA, Tmin ≤ Tamb ≤ Tmax
3
20
3
20
mV
Temperature coefficient of reference input
voltage(2)
VKA = Vref, Ik = 10 mA, Tmin ≤Tamb ≤ Tmax
±13
±90
±13
±90
ppm/°C
ΔVref
---------------ΔT
ΔVref
---------------ΔVka
Ratio of change in reference input voltage to
change in cathode to anode voltage - see
Figure 5
Ik = 10mA - ΔVKA = 36V to 3V
2.490 2.500 2.510 2.493 2.500 2.507
-2
-1.1
-2
-1.1
V
mV/V
Reference input current
Ik = 10mA, R1 = 10kΩ, R2 = ∞
Tmin ≤ Tamb ≤ Tmax
1.5
2.5
3
1.5
2.5
3
µA
ΔIref
Reference input current deviation over
temperature range
Ik = 10mA, R1 = 10kΩ, R2 =∞, Tmin ≤ Tamb ≤ Tmax
0.2
1.2
0.2
1.2
µA
Imin
Minimum cathode current for regulation - Figure 4
VKA = Vref
0.5
1
0.5
0.6
mA
Ioff
Off-state cathode current - see Figure 6
180
500
180
500
nA
0.2
0.5
0.2
0.5
Ω
Iref
(3)
⏐ ZKA⏐
Dynamic impedance
VKA = Vref , ΔIk = 1 to100mA, f ≤ 1kHz
1. See Reference input voltage deviation over temperature range in Section 4: Parameter definitions on page 9.
2. See Temperature coefficient of reference input voltage in Section 4: Parameter definitions on page 9.
3. See Dynamic impedance in Section 4: Parameter definitions on page 9.
4/16
TL1431
Table 4.
Electrical characteristics
Tamb = 25°C (unless otherwise specified)
TL1431I
Symbol
TL1431AI
Parameter
Unit
Min.
Typ.
Max.
Min.
Typ.
Vref
Reference input voltage - see Figure 4
VKA = Vref , Ik = 10 mA
ΔVref
Reference input voltage deviation over
temperature range (1) - see Figure 4
VKA = Vref, Ik = 10 mA, Tmin ≤ Tamb ≤ Tmax
7
30
7
Temperature coefficient of reference input
voltage(2)
VKA = Vref, Ik = 10 mA, Tmin ≤ Tamb ≤ Tmax
±22
±100
±22
ΔVref
---------------ΔT
ΔVref
---------------ΔVka
Ratio of change in reference input voltage to
change in cathode to anode voltage - see
Figure 5
Ik = 10mA - ΔVKA = 36V to 3V
Max.
2.490 2.500 2.510 2.493 2.500 2.507
-2
-1.1
-2
30
V
mV
±100 ppm/°C
-1.1
mV/V
Reference input current
Ik = 10mA, R1 = 10kΩ, R2 = ∞
Tmin ≤ Tamb ≤ Tmax
1.5
2.5
3
1.5
2.5
3
µA
ΔIref
Reference input current deviation over
temperature range
Ik = 10mA, R1 = 10kΩ, R2 =∞, Tmin ≤ Tamb ≤ Tmax
0.5
1
0.8
1.2
µA
Imin
Minimum cathode current for regulation - see
Figure 4
VKA = Vref
0.5
1
0.5
0.7
mA
Ioff
Off-state cathode current - see Figure 6
180
500
180
500
nA
Dynamic impedance (3)
VKA = Vref , ΔIk= 1 to100mA, f ≤ 1kHz
0.2
0.5
0.2
0.5
Ω
Iref
⏐ ZKA⏐
1. See Reference input voltage deviation over temperature range in Section 4: Parameter definitions on page 9.
2.
See Temperature coefficient of reference input voltage in Section 4: Parameter definitions on page 9.
3. See Dynamic impedance in Section 4: Parameter definitions on page 9.
5/16
Electrical characteristics
Figure 4.
TL1431
Test circuit for VKA = VREF
Figure 5.
Test circuit for VKA = VREF
Input
Input
R
Output
R
IK
Output
R1
IK=10mA
VKA
IREF
R2
VKA
VREF
VREF
R1
VKA = VREF ( 1 + -------- ) + R1 x IREF
R2
Figure 6.
Test circuit for IOFF
Figure 7.
Test circuit for phase margin and
voltage gain
VKA=36V
10μF
10μF
Figure 8.
Test circuit for response time
Figure 9.
Output
8.25kΩ
Input
IK=10mA
15kΩ
IOFF
VREF
Reference voltage vs. temperature
1 mA
0 mA
Output
IK=1mA
Reference voltage (V)
2.500
2.498
2.496
2.494
2.492
IK=10 mA
VKA=VREF=2.5 V
See figure 1
2.490
2.488
2.486
-40
-20
0
20
40
60
Temperature (°C)
6/16
80
100
120
TL1431
Electrical characteristics
Figure 10. Reference voltage vs. cathode
current
Figure 11. Reference voltage vs. cathode
current
3.0
Reference voltage (V)
Reference voltage (V)
3
2
VKA=VREF
See figure 1
1
0
2.5
2.0
VKA=VREF
See figure 1
1.5
1.0
0.5
-1
-40
-20
0
20
40
60
80
0.0
0.0
100
0.2
0.4
Cathode current (mA)
0.6
Figure 12. Reference current vs. temperature
0.10
VKA = 36V
See figure 3
0.08
IOFF (µA)
IREF (µA)
1.5
1.0
IK=10 mA
VKA=VREF
See figure 1
0.5
-20
0
20
40
60
80
0.06
0.04
0.02
100
0.00
-40
120
-20
0
Temperature (°C)
40
60
80
100
120
Figure 15. Drift of RKA vs. temperature
0.00
0.0
IK=10 mA
VKA=VREF
See figure 2
-0.5
IK=10 mA
VKA=VREF= 2.5V
see figure 1
-0.01
Δ RKA (Ω )
ΔVREF / ΔVKA (mV / V)
20
Temperature(°C)
Figure 14. Ratio of change in VREF to change
in VKA vs. temperature
-1.0
-1.5
-2.0
-40
1.0
Figure 13. Off-state cathode current vs.
temperature
2.0
0.0
-40
0.8
Cathode current (mA)
-0.02
-0.03
-20
0
20
40
60
Temperature (°C)
80
100
120
-0.04
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
7/16
Electrical characteristics
TL1431
Figure 16. Maximum operating current vs.
temperature
Figure 17. Gain and phase vs. frequency
0.52
60
200
IK=10 mA
See figure 4
Gain
0.50
40
150
100
Gain (dB)
IK=IMIN
VKA=VREF
See figure 1
0.46
50
Phase
20
0
0
-50
0.44
-100
-20
0.42
-150
0.40
-40
-40
-20
0
20
40
60
80
100
120
1
10
100
Frequency (kHz)
Temperature (°C)
Figure 18. Stability behavior with capacitive
loads
-200
10000
1000
Figure 19. Maximum power dissipation
100
100
TAMB= +25°C
80
VKA=5V
60
Stable
Area
Cathode current (mA)
Cathode current (mA)
VKA=VREF
Stable
Area
Instable
Area
VKA=12V
40
VKA=24V
0
1E-10
1E-8
1E-7
1E-6
1E-5
Figure 20. Pulse response for IK = 1 mA
6
Voltage (V)
Current step: 1 mA
4
TAMB=+25°C
See figure 6
Output voltage
2
0
1
2
3
Time (µs)
8/16
TO92
40
0
1E-9
Capacitive Load (F)
0
60
20
20
4
5
SO8
Batwing
80
Safe
Area
10
20
Cathode voltage (V)
30
Phase (°)
IMIN (mA)
0.48
TL1431
4
Parameter definitions
Parameter definitions
Reference input voltage deviation over temperature range
ΔVref is defined as the difference between the maximum and minimum values obtained over
the full temperature range.
ΔVref = Vref max. - Vref min.
Figure 21. Reference input voltage deviation over temperature range
V ref max.
V ref min.
Temperature
T2
T1
Temperature coefficient of reference input voltage
The temperature coefficient is defined as the slopes (positive and negative) of the voltage
versus temperature limits within which the reference is guaranteed.
Figure 22. Temperature coefficient of reference input voltage
-n p
pm
Max
2.5V
min
/°C
C
m/°
p
+n p
Temperature
25°C
Dynamic impedance
ΔV
KA
The dynamic impedance is defined as | ZKA| = --------------Δ IK
9/16
Package information
5
TL1431
Package information
In order to meet environmental requirements, ST 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 ST trademark.
ECOPACK specifications are available at: www.st.com.
10/16
TL1431
5.1
Package information
SO-8 batwing package information
Figure 23. SO-8 batwing package mechanical drawing
Table 5.
SO-8 batwing package mechanical data
Dimensions
Ref.
Millimeters
Min.
Typ.
A
Inches
Max.
Min.
Typ.
1.75
0.069
A1
0.10
A2
1.25
b
0.28
0.48
0.011
0.019
c
0.17
0.23
0.007
0.010
D
4.80
4.90
5.00
0.189
0.193
0.197
E
5.80
6.00
6.20
0.228
0.236
0.244
E1
3.80
3.90
4.00
0.150
0.154
0.157
e
0.25
Max.
0.004
0.010
0.049
1.27
0.050
h
0.25
0.50
0.010
0.020
L
0.40
1.27
0.016
0.050
k
1°
8°
1°
8°
ccc
0.10
0.004
11/16
Package information
5.2
TL1431
TO92 (ammopack and tape and reel) package information
Figure 24. TO-92 ammopack and tape and reel package mechanical drawing
A1
P
T
P
A
H
W2
W0
W
W1
H0
I1
H
L1
H1
d
D0
F1 F2
P2
P0
Table 6.
TO-92 ammopack and tape and reel package mechanical data
Millimeters
Inches
Dim.
Min
Typ.
Min.
Typ.
Max.
AL
5.0
0.197
A
5.0
0.197
T
4.0
0.157
d
0.45
0.018
I1
2.5
P
11.7
12.7
13.7
0.461
0.500
0.539
PO
12.4
12.7
13
0.488
0.500
0.512
P2
5.95
6.35
6.75
0.234
0.250
0.266
F1/F2
2.4
2.5
2.8
0.094
0.098
0.110
Δh
-1
0
1
-0.039
0
0.039
ΔP
-1
0
1
-0.039
0
0.039
W
17.5
18.0
19.0
0.689
0.709
0.748
W0
5.7
6
6.3
0.224
0.236
0.248
W1
8.5
9
9.75
0.335
0.354
0.384
0.098
W2
0.5
0.020
H
20
0.787
H0
15.5
16
H1
DO
L1
12/16
Max.
16.5
0.610
0.630
25
3.8
4.0
4.2
11
0.650
0.984
0.150
0.157
0.165
0.433
TL1431
5.3
Package information
TO92 (bulk) package information
Figure 25. TO-92 bulk package mechanical drawing
Table 7.
TO-92 bulk package mechanical data
Millimeters
Inches
Dim.
Min
L
Typ.
Max.
Min.
1.27
Typ.
Max.
0.05
B
3.2
3.7
4.2
0.126
0.1457
0.1654
O1
4.45
5.00
5.2
0.1752
0.1969
0.2047
C
4.58
5.03
5.33
0.1803
0.198
0.2098
K
12.7
O2
0.407
0.0197
0.02
a
0.35
0.5
0.5
0.508
0.016
0.0138
13/16
Ordering information
6
TL1431
Ordering information
Table 8.
Order codes
Order code
Temperature
range
Package
Packing
SO-8
Tube or
tape and reel
TL1431CD
TL1431CDT
1431C
TL1431ACD
TL1431ACDT
TL1431CZ
TL1431CZT
TL1431CZ-AP
1431AC
-20°C, +70°C
TL1431C
TO92
TL1431ACZ
TL1431ACZT
TL1431ACZ-AP
1431I
SO-8
TL1431AID
TL1431AIDT
Tube or
tape and reel
1431AI
TL1431I
-40°C, + 105°C
TO92
TL1431AIZ
TL1431AIZT
TL1431AIZ-AP
TL1431IYD(1)
TL1431IYDT(1)
Bulk or
Tape or
Ammopack
TL1431AC
TL1431ID
TL1431IDT
TL1431IZ
TL1431ZT
TL1431IZ-AP
Marking
Bulk or
Tape or
Ammopack
TL1431AI
SO-8
(Automotive grade)
Tube or
tape and reel
1431IY
1. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening
according to AEC Q001 and Q 002 or equivalent are on-going.
14/16
TL1431
7
Revision history
Revision history
Table 9.
Document revision history
Date
Revision
01-Mar-2002
1
Initial release.
01-Nov-2005
2
PPAP references inserted in the datasheet seeTable 8: Order codes
on page 14.
3
Minimum value for temperature range updated in Table 2: Operating
conditions.
Δ
Vref--------------Minimum values added and maximum values deleted for Δ Vka
parameter in Table 4 in Section 3: Electrical characteristics.
Package information for TO92 tape and reel updated, see Section 5:
Package information.
Format update.
4
Corrected SO-8 package mechanical data.
Corrected footnote for automotive grade order codes in order code
table.
Corrected packing information for TO92 devices in order code table.
25-Apr-2007
11-Mar-2008
Changes
15/16
TL1431
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16/16