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SC431
Adjustable Shunt Regulator
POWER MANAGEMENT
Description
Features
The SC431 is a three terminal adjustable shunt
regulator with thermal stability guaranteed over
temperature. The output voltage can be adjusted to any
value from 2.5V (V
REF
) to 30V with two external
resistors. The SC431 has a typical dynamic output
impedance of 0.25
Wide operating current range 130µA to 150mA
Low dynamic output impedance 0.25
typ.
Trimmed bandgap design +
0.5%
Alternate for TL1431, TL431, LM431 & AS431
Industrial temperature range
Available in SOT-23-3 and SO-8 packages.
Also available in Lead-free, fully WEEE and RoHS
compliant.
. Active output circuitry provides a
very sharp turn on characteristic, making the SC431 an
excellent replacement for zener diodes.
The SC431 shunt regulator is available with four
voltage tolerances (0.5%, 1.0% and 2.0% over T
A
= -40
°
C
to +85
°
C and 0.5% over T
A
= -40
°
C to +125
°
C) and two
package options (SOT-23-3 and SO-8). This
allows the designer the opportunity to select the
optimum combination of cost and performance for their
application.
Applications
Linear Regulators
Adjustable Supplies
Switching Power Supplies
Battery Operated Computers
Instrumentation
Computer Disk Drives
Typical Application Circuit
(1)(2)
Notes:
1) Set V
OUT
according to the following equation:
R
V
=
V
1
+
+
I
R
OUT
REF
REF
R
2
2) Choose the value for R as follows:
•
The maximum limit for R should be such that the
cathode current, I
Z
, is greater than the minimum
operating current (130µA) at V
IN(MIN)
.
•
The minimum limit for R should be such that I
Z
does
not exceed 150mA under all load conditions, and the
instantaneous turn-on value for I
Z
does not exceed
200mA. Both of the following conditions must be met:
V
IN
(max)
R
(to limit instantaneous turn-on I
Z
)
min
200
mA
V
V
IN
(max)
OUT
R
(to limit I
Z
under normal
min
I
150
mA
+
OUT
(min)
operating conditions)
Revision: April 23, 2008
1
www.semtech.com
SC431
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not implied.
P
a
r
m
t
r
S
y
m
o
l
M
x
i
m
U
n
i
C
a
t
d
e
V
l
g
e
V
Z
3
1
V
C
o
n
n
u
C
a
t
d
e
C
u
n
I
Z
1
5
0
m
R
f
r
n
I
u
C
u
n
I
1
0
m
R
F
P
o
w
r
D
i
s
p
a
t
o
n
a
t
T
=
2
5
°
A
S
O
3
-
P
D
0
.
7
W
S
O
0
.
8
T
r
l
R
s
s
n
S
O
3
-
3
3
6
°
/
J
S
O
1
6
3
O
e
r
t
n
A
m
i
e
n
T
m
e
r
t
R
n
e
S
C
4
3
1
C
x
,
S
C
4
3
1
C
x
,
S
C
4
3
1
C
x
T
A
-
0
t
+
5
°
S
C
4
3
1
C
x
-
0
t
+
2
5
O
e
r
t
n
J
o
n
T
m
e
r
t
R
n
e
T
J
-
0
t
+
5
0
°
S
t
r
g
e
T
m
e
r
t
R
n
e
T
-
5
t
+
5
0
°
S
T
L
e
a
d
T
m
e
r
t
(
o
l
e
r
n
)
1
0
s
c
n
s
T
3
0
0
°
L
E
A
D
E
S
D
R
t
n
(
n
B
o
d
y
M
d
e
l
V
2
k
E
S
D
Electrical Characteristics
Unless specified:T
A
= 25°C. Values in
bold
apply over full operating ambient temperature range.
S
C
4
3
1
C
x
-
,
S
C
4
3
1
C
x
-
S
C
4
3
1
C
x
Q
P
a
r
m
t
r
S
y
m
o
l
C
o
n
d
i
n
M
T
p
M
x
M
T
p
M
x
U
n
i
R
f
r
n
V
l
g
e
V
V
Z
=
V
,
I
=
1
0
m
(
)
2
.
8
2
2
.
9
5
2
.
0
7
2
.
7
0
2
.
9
5
2
.
2
0
V
R
F
R
F
Z
V
T
m
D
e
v
a
t
o
n
V
V
Z
=
V
,I
Z
=
1
0
m
(
)
8
1
7
8
2
5
m
R
F
D
E
V
R
F
R
t
o
o
f
C
h
n
e
i
n
I
Z
=
1
0
m
,
V
Z
=
1
0
V
t
V
-
.
-
.
-
.
-
.
m
/
V
R
F
REF
V
V
t
C
h
n
e
i
n
V
I
Z
=
1
0
m
,
V
Z
=
0
V
t
1
0
V
-
.
-
.
-
.
-
.
Z
R
F
Z
R
f
r
n
I
u
I
R
=
1
0
k
,
R
=
,
0
.
4
0
.
4
µ
R
F
C
u
n
I
Z
=
1
0
m
(
)
I
T
m
e
r
t
I
R
=
1
0
k
,
R
=
,
0
.
1
.
0
.
1
.
µ
R
F
R
F
(
E
V
)
D
e
v
a
t
o
n
I
Z
=
0
m
(
)
O
t
t
C
a
t
d
e
I
V
=
0
V
V
=
0
V
0
.
4
0
.
0
0
.
4
0
.
0
µ
(
)
Z
(
F
)
R
F
Z
C
u
n
D
y
m
c
O
u
r
Z
f
<
1
k
V
=
V
0
.
5
0
.
0
0
.
5
0
.
0
Z
R
F
I
e
d
a
n
I
Z
=
1
3
0
µ
t
1
0
0
m
(
)
M
n
m
O
e
r
t
n
I
V
Z
=
V
(
)
1
3
0
1
3
0
µ
Z
(
R
F
C
u
n
2008 Semtech Corp.
2
www.semtech.com
SC431
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified:T
A
= 25°C. Values in
bold
apply over full operating ambient temperature range.
S
C
4
3
1
C
x
-
P
a
r
m
t
r
S
y
m
o
l
C
o
n
d
i
n
M
T
p
M
x
U
n
i
R
f
r
n
V
l
g
e
V
V
Z
=
V
,
I
=
1
0
m
2
.
4
5
2
.
9
5
2
.
4
5
V
(
)
R
F
R
F
Z
V
T
m
D
e
v
a
t
o
n
V
V
Z
=
V
,I
Z
=
1
0
m
1
5
3
0
m
(
)
R
F
D
E
V
R
F
R
t
o
o
f
C
h
n
e
i
n
V
t
V
I
Z
=
1
0
m
,
V
Z
=
1
0
V
t
V
-
.
-
.
m
/
REF
V
R
F
R
F
Z
C
h
n
e
i
n
V
I
Z
=
1
0
m
,
V
Z
=
0
V
t
1
0
V
-
.
-
.
Z
R
f
r
n
I
u
C
u
n
I
R
=
1
0
k
,
R
=
,
I
=
1
0
m
(
)
0
.
4
µ
R
F
Z
I
T
m
e
r
t
D
e
v
a
t
o
n
I
R
=
1
0
k
,
R
=
,I
Z
=
0
m
0
.
1
.
µ
(
)
R
F
R
F
(
E
V
)
O
t
t
C
a
t
d
e
C
u
n
I
V
=
0
V
V
=
0
V
0
.
4
0
.
0
µ
(
)
Z
(
F
)
R
F
Z
D
y
m
c
O
u
I
e
d
a
n
r
Z
f
<
1
k
V
=
V
,
I
=
1
3
0
µ
t
1
0
0
m
0
.
5
0
.
0
(
)
Z
R
F
Z
M
n
m
O
e
r
t
n
C
u
n
I
V
Z
=
V
(
)
1
3
0
µ
Z
(
R
F
Notes:
(1) See Test Circuit 1 below.
(2) See Test Circuit 2 below.
(3) See Test Circuit 3 below.
Test Circuits
Test Circuit 1
V
Z
= V
REF
Test Circuit 2
V
Z
> V
REF
Test Circuit 3
Off-State
Recommended Operating Conditions
M
M
x
S
y
m
o
l
C
a
t
d
e
V
l
g
e
,
V
V
3
0
V
Z
R
F
C
a
t
d
e
C
u
n
I
0
.
3
0
1
5
0
m
Z
2008 Semtech Corp.
3
www.semtech.com
SC431
POWER MANAGEMENT
Pin Configurations
SOT-23-3 (Top View)
SO-8 (Top View)
Block Diagram
Symbol
Ordering Information
T
l
r
n
c
e
0
.
%
0
.
%
1
.
%
2
.
%
A
i
n
t
T
m
e
r
t
r
R
a
n
g
e
-
0
°
t
+
5
°
-
0
°
t
+
2
5
°
-
0
°
t
+
5
°
-
0
°
t
+
5
°
S
O
3
-
S
C
4
3
1
C
S
K
-
T
S
C
4
3
1
C
S
K
Q
S
C
4
3
1
C
S
K
-
.
S
C
4
3
1
C
S
K
-
.
(
)
S
O
3
-
S
C
4
3
1
C
S
K
-
T
S
C
4
3
1
C
S
K
Q
S
C
4
3
1
C
S
K
-
T
S
C
4
3
1
C
S
K
-
T
(
)
)
S
O
(
)
S
C
4
3
1
C
S
-
T
S
C
4
3
1
C
S
Q
S
C
4
3
1
C
S
-
.
S
C
4
3
1
C
S
-
.
S
O
(
)
)
S
C
4
3
1
C
S
-
T
S
C
4
3
1
C
S
Q
S
C
4
3
1
C
S
-
.
S
C
4
3
1
C
S
-
.
Notes:
(1) Only available in tape and reel packaging. A reel contains 3000 devices.
(2) Only available in tape and reel packaging. A reel contains 2500 devices.
(3) “T” at end of part number indicates “lead free”. This product is fully WEEE and RoHS compliant.
2008 Semtech Corp.
4
www.semtech.com
SC431
POWER MANAGEMENT
Marking Information
SOT-23-3 (Top View)
SO-8 (Top View)
SC
431CS
yyww
4 3 1
4 3 1
SO-8 (Bottom View)
xxxxx
yyww = Datecode (Example: 0008)
xxxxx = Semtech Lot # (Example: 00101)
2008 Semtech Corp.
5
www.semtech.com
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