TSC TS431ACS

TS431/431A/431B
Adjustable Precision Shunt Regulator
Sink Current Capability up to 100mA
General Description
The TS431/431A/431B integrated circuits are three-terminal programmable shunt regulator diodes. These monolithic IC
voltage references operate as a low temperature coefficient zener which is programmable from Vref to 36 volts with two
external resistors. These devices exhibit a wide operating current range of 1.0 to 100mA with a typical dynamic
impedance of 0.22Ω. The characteristics of these references make them excellent replacements for zener diodes in many
applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.5volt reference makes it convenient to
obtain a stable reference from 5.0volt logic supplies, and since The TS431/431A/431B operates as a shunt regulator, it
can be used as either a positive or negative stage reference.
This series is offered in 3-pin TO-92, SOT-89, SOT-23 and SOP-8 package.
Features
—
Standard Application
Precision Reference Voltage
TS431
2.495V±2%
TS431A 2.495V±1%
TS431B 2.495V±0.5%
o
—
Equivalent Full Range Temp. Coefficient: 50ppm/ C
—
Programmable Output Voltage up to 36V
—
Fast Turn-On Response
—
Sink Current Capability of 1.0 to 100 mA
—
Low Dynamic Output Impedance: 0.22Ω
—
Low Output Noise
Ordering Information
Block Diagram
Part No.
Operating Temp.
(Ambient)
TS431xCT
TS431xCY
Package
TO-92
-20 ~ +85 oC
TS431xCX
SOT-89
SOT-23
TS431xCS
Note: Where x denotes voltage tolerance.
Blank: ±2%
A: ±1%
B: ±0.5%
SOP-8
Pin Assignment
Pin No.
TS431/A/BCT
TS431/A/BCY
TS431/A/BCX
TS431/A/BCS
1
1
1
8
2
2
3
2,3,6,7
3
3
2
1
4,5
TS431/A/B
1-8
Pin
Description
Reference
Anode
Cathode
Non connect
2003/12 rev. B
Absolute Maximum Rating
Cathode Voltage (Note 1)
Continuous Cathode Current Range
Reference Input Current Range
Power Dissipation (Note 2, 3)
Vka
37
V
Ik
-100 ~ +150
mA
Iref
-0.05 ~ +10
mA
TO-92
0.625
SOT-89 / SOP-8
Pd
0.5
SOT-23
W
0.3
Operating Junction Temperature Range
+125
o
C
-65 ~ +150
o
C
Tj
Storage Temperature Range
TSTG
Note 1: Voltage values are with respect to the anode terminal unless otherwise noted.
o
Note 2: Tj Max = 150 C
o
Note 3: Rating apply to ambient temperature at 25 C
Recommend Operating Condition
Cathode Voltage Range
Cathode Current Range (for regulation)
Vka
Ref ~ 36
V
Ik
1 ~ 100
mA
Electrical Characteristics
o
(Ta=25 C, unless otherwise specified.)
Parameter
Reference
TS431
voltage
TS431A
Symbo
Test Conditions
voltage, over temp. (Note 4)
Reference Input current
Vka =Vref, Ik=10mA (Figure 1)
∆Vref
Iref
∆Vref /
change in cathode Voltage
∆Vka
current, over temp.
Minimum operating cathode
current
Off-state Cathode Current
Dynamic Output Impedance
TS431/A/B
2.475
Ta = full range
Max
Unit
2.550
2.495
2.487
Radio of change in Vref to
Deviation of reference input
Typ
2.450
Vref
TS431B
Deviation of reference input
Min
2.525
V
2.513
--
3
17
mV
--
0.7
4.0
uA
Ika=10mA, Vka = 10V to Vref,
--
-1.4
-2.7
Vka = 36V to 10V (Figure 2)
--
- 1.0
- 2.0
--
0.4
1.2
uA
--
0.4
0.6
mA
--
--
1.0
uA
--
0.22
0.5
Ω
Vka =Vref, Ik=10mA (Figure 1)
R1=10KΩ, R2= ∞ , Ika=10mA
(Figure 2)
mV/V
Ta= full range
Iref(DEV)
R1=10KΩ, R2= ∞ , Ika=10mA
(Figure 2)
Ika(min)
Vka=Vref (Figure 1)
Ioff
Vref=0V (Figure 3)
|Zka|
Vka=36V
f<1KHz, Vka=Vref
Ika=1mA to 100mA (Figure 1)
2-8
2003/12 rev. B
Electrical Characteristics (continued) (Ta=25 oC, unless otherwise specified.)
Note 4. Deviation of reference input voltage, VDEV, is defined as the maximum deviation of the reference over the full
temperature range.
The average temperature coefficient of the reference input voltage αVref is defined as:
| αVref | = [ VDEV / Vref(25 oC) ] * 106 / T2 – T1…………………….. (PPM/ oC)
Where: T2-T1 = full temperature change.
αVref can be positive or negative depending on whether the slope is positive or negative.
Example: Maximum Vref=2.496V at 30oC, minimum Vref=2.492V at 0oC, Vref=2.495V at 25oC, ∆T=70 oC
| αVref | = [ 4mV / 2495mV ] * 106 / 70oC ≈ 23ppm/oC
Note 5. The dynamic output impedance, Rz, is defined as:
| Zka | = ∆Vka / ∆Ika
When the device is programmed with two external resistors R1and R2 (see Figure 2). The dynamic output
impedance of the overall circuit, is defined as :
| Zka | = ∆v / ∆i | ≈ Zka | * ( 1 + R1 / R2)
Test Circuits
TS431/A/B
3-8
2003/12 rev. B
Application Examples
TS431/A/B
4-8
2003/12 rev. B
Application Examples
TS431/A/B
5-8
2003/12 rev. B
Typical Performance Characteristics
TS431/A/B
6-8
2003/12 rev. B
TO-92 Mechanical Drawing
A
DIM
B
A
B
C
D
E
E
C
H
F
TO-92 DIMENSION
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX
4.30
4.30
4.70
4.70
0.169
0.169
0.185
0.185
14.30(typ)
0.43
2.19
0.49
2.81
0.563(typ)
0.017
0.086
0.019
0.111
F
3.30
3.70
0.130
0.146
G
H
2.42
0.37
2.66
0.43
0.095
0.015
0.105
0.017
G
D
SOT-89 Mechanical Drawing
A
SOT-89 DIMENSION
I
B
DIM
C
H
G
E
D
J
F
TS431/A/B
7-8
MILLIMETERS
MIN
MAX
INCHES
MIN
MAX
A
4.40
4.60
0.173
0.181
B
C
1.50
2.30
1.7
2.60
0.059
0.090
0.070
0.102
D
0.40
0.52
0.016
0.020
E
F
1.50
3.00
1.50
3.00
0.059
0.118
0.059
0.118
G
0.89
1.20
0.035
0.047
H
I
4.05
1.4
4.25
1.6
0.159
0.055
0.167
0.068
J
0.35
0.44
0.014
0.017
2003/12 rev. B
SOT-23 Mechanical Drawing
A
B
F
SOT-23 DIMENSION
DIM
E
G
D
MILLIMETERS
MIN
MAX
INCHES
MIN
MAX
A
2.88
2.91
0.113
0.115
B
C
0.39
1.78
0.42
2.03
0.015
0.070
0.017
0.080
D
0.51
0.61
0.020
0.024
E
F
1.59
1.04
1.66
1.08
0.063
0.041
0.065
0.043
G
0.07
0.09
0.003
0.004
C
SOP-8 Mechanical Drawing
A
DIM
9
16
B
1
P
8
MIN
MAX
MIN
MAX
A
B
4.80
3.80
5.00
4.00
0.189
0.150
0.196
0.157
C
1.35
1.75
0.054
0.068
D
F
0.35
0.40
0.49
1.25
0.014
0.016
0.019
0.049
G
G
K
M
R
C
D
TS431/A/B
M
F
K
8-8
SOP-8 DIMENSION
MILLIMETERS
INCHES
1.27 (typ)
0.10
0o
0.25
7o
0.05 (typ)
0.004
0o
0.009
7o
P
5.80
6.20
0.229
0.244
R
0.25
0.50
0.010
0.019
2003/12 rev. B