1/9
s
LOW VOLTAGE OPERATION : 1.24 TO 6V
s
2%, 1% AND 0.5% VOLTAGE PRECISION
s
WIDE OPERATING RANGE CATHODE
CURRENT : 60
A TO 30mA
s
LOW OUTPUT IMPEDANCE : 0.2
s
TYPICALLY STABLE FOR ANY CAPACI-
TIVE LOADS
s
ESD PROTECTION :
2kV (Human Body Model)
200V (Machine Model)
s
100ppm/C TEMPERATURE COEFFICIENT
DESCRIPTION
The TS431 is a low voltage three terminals pro-
grammable shunt Voltage Reference. The output
voltage can be set to any value between Vref
(1.24V) and 6V with two external resistors. The
TS431 is able to operate at a lower voltage
(1.24V) and lower cathode current than the wide-
spread TL431 and TL1431 shunt voltage refer-
ence.
When driving an optocoupler, the TS431 is partic-
ularly interesting to regulate 3.3V switching power
supplies.
ORDER CODE
Z = TO92 Plastic package - also available in Bulk (Z), Tape & Reel (ZT)
and Ammo Pack (AP)
LT = Tiny Package (SOT23-5) - only available in Tape & Reel (LT)
PIN CONNECTIONS (top view)
Part
Number
Temperature
Range
Package
SOT-23
Marking
Z
L
TS431I
-40C, +125C
L272
TS431AI
L271
TS431BI
L270
Z
TO92
(Plastic Package)
L
SOT23-5
(Plastic Micropackage)
TO92
(Top view)
SOT23-5
(Top view)
TS431
LOW VOLTAGE ADJUSTABLE SHUNT REFERENCE
April 2002
TS431
2/9
ABSOLUTE MAXIMUM RATINGS
OPERATING CONDITIONS
ELECTRICAL CHARACTERISTICS
T
amb
= 25C (unless otherwise specified)
Symbol
Parameter
Value
Unit
V
KA
Cathode to Anode Voltage
10
V
I
k
Continuous Cathode Current Range
-20 to +40
mA
I
ref
Reference Input Current Range
-0.05 to +3
mA
P
d
Power Dissipation
1)
TO92
package
SOT23-5 package
625
500
mW
T
std
Storage Temperature Range
-65 to +150
C
1. T
junction
=150C, T
amb
=25C with R
THj-a
=200C/W for TO92 package and R
THj-a
=250C/W for SOT23-5L package
Symbol
Parameter
Value
Unit
V
KA
Cathode to Anode Voltage
1.24 to 6
V
I
k
Cathode Current
0.06 to 30
mA
T
oper
Operating Free Air Temperature Range
-40 to +125
C
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Vref
Output Voltage
V
KA
= V
ref
@ I
k
= 100
A
TS431
TS431A
TS431B
1.215
1.228
1.234
1.240
1.265
1.252
1.246
V
V
ref
Output Voltage Change
1)
2)
I
k
= 100
A, V
KA
= V
re
f
1.
Limits are 100% production tested at 25C. Limits over temperature are guaranteed through correlation and by design.
2.
V
ref
is defined as the difference between the maximum and minimum values obtained over the full temperature range.
V
ref
= V
ref max.
- V
ref min.
0 < T
amb
< +70C
-40 < T
amb
< +85C
-40 < T
amb
< +105C
-40 < T
amb
< +125C
9
16
18
21
mV
Ratio of Change in Reference Input
Voltage to Change in Cathode to Anode
Voltage
I
K
= 10mA
V
KA
= 6V to V
ref
1.8
2.7
mV/V
I
ref
Reference Input Current
I
K
= 10mA
70
160
nA
I
ref
Reference Input Current Deviation
Over Temperature Range
I
K
=10mA R
1
=10k
R
2
=
-40 < T
amb
< +85C
-40 < T
amb
< +125C
70
90
160
240
nA
I
min
Minimum Cathode Current for Regulation V
KA
= V
ref
40
60
A
I
off
Off-State Cathode Current
V
KA
= 6V
,
V
ref
= 0
0.001
0.1
A
R
KA
Static Impedance
V
KA
= V
ref
,
I
K
= 0.1 to 15mA
0.2
0.4
V ref
Vka
----------------
T1
T2
Te mp e ratu re
Vref min.
Vref max.
TS431
3/9
Reference voltage vs temperature
Cathode voltage vs cathode current
Reference input current vs temperature
Test circuit for Vka = Vref
Cathode voltage vs cathode current
Static impedance vs temperature
-40
-20
0
20
40
60
80
100
120
Temperature (C)
1.228
1.232
1.236
1.24
1.244
1.248
1.252
R
e
f
e
renc
e v
o
lt
age (V)
Vka = Vref
Ik = 100 A
-1
-0.5
0
0.5
1
1.5
Vka Cathode voltage (V)
-15
-10
-5
0
5
10
15
I
k
a C
a
t
hode
c
u
rren
t
(m
A)
Vka = Vref
T = 25C
-40
-20
0
20
40
60
80
100
120
Temperature (C)
0
20
40
60
80
100
I
r
ef
R
e
f
e
renc
e
c
u
rren
t
(nA)
Ik = 10mA
R1 = 10 K
R2 = +
Input
Vka
Vref
Ik
Output
0
10
20
30
40
50
60
Ika Cathode current (A)
0
0.5
1
1.5
Vk
a
C
a
t
h
ode v
o
lt
age (V)
-40C
+25C
+85C
+125C
-40
-20
0
20
40
60
80
100
120
Temperature (C)
0
0.1
0.2
0.3
0.4
R
k
a
St
at
ic
I
m
peda
nc
e (Ohm
s
)
Vka = Vref
Ik = 100A to 15mA
TS431
4/9
Off-State current vs temperature
Ratio of change in reference input voltage to
change in Vka voltage vs temperature
Phase and Gain vs frequency
Test circuit for Off-State current measurement
Test circuit for Vka > Vref
Test circuit for phase and gain measurement
-40
-20
0
20
40
60
80
100
120
Temperature (C)
0
50
100
150
200
IO
ff
O
f
f-
S
t
a
t
e
c
u
r
r
e
n
t
(
n
A
)
-40
-20
0
20
40
60
80
100
120
Temperature (C)
-3
-2
-1
0
R
a
t
i
o of
c
han
ge
in
ref
e
renc
e
in
put
v
o
lt
age (m
V
/
V)
Ik = 10mA
Vka = 6V to Vref
1E+3
1E+4
1E+5
1E+6
Frequency (Hz)
0
10
20
30
40
50
60
Gai
n
(
d
B)
-150
-100
-50
0
50
100
150
P
has
e
(
)
P
has
e
m
a
rgi
n
# 50
Gain
Phase
Input
Vka=6V
Ioff
Input
Ik
Vka = Vref . (1+R1/R2) + Iref . R1
Vka
R1
R2
Iref
Vref
Input
Vref
Ik=100A
Output
10F
10F
6.8K
4.3K
TS431
5/9
Pulse response at Ik=100A
Pulse response at Ik = 1mA
Equivalent input noise vs frequency
Test circuit for pulse response at Ik = 100A
Test circuit for pulse response at Ik = 1mA
0
1
2
3
4
5
6
7
8
9
10
Time (s)
0
1
2
3
i
n
pu
t
a
n
d
o
u
t
p
ut
v
o
l
t
ag
e
(
V
)
Input voltage
Output voltage
0
1
2
3
4
5
6
7
Time (s)
0
1
2
3
i
n
p
u
t
an
d o
u
t
p
ut
v
o
l
t
ag
e (
V
)
Input voltage
Output voltage
0.1
1
10
100
1000
Frequency (KHz)
0
50
100
150
200
250
Eq
uiv
a
le
nt
input
no
is
e (n
v
/
V
H
z
)
Vka = Vref
Ik = 100 A
T=25C
Ik=100A
O
u
tput
50
18K
Pulse
Generator
f=100KHz
Intpu
t
Ik=1mA
O
utput
50
1.8K
Pulse
Generator
f=100KHz
Intput
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