2003 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1
Features
Programmable Output Voltage to 36 Volts
Low Dynamic Output Impedance 0.20 Typical
Sink Current Capability of 1.0 to 100mA
Equivalent Full-Range Temperature Coefficient of
50ppm/
C Typical
Temperature Compensated for Operation Over Full Rated
Operating Temperature Range
Low Output Noise Voltage
Fast Turn-on Response
Description
The FAN431/FAN431A/FAN431L are three terminal
output adjustable regulators with thermal stability over
operating temperature range. The output voltage can be set
any value between V
REF
(approximately 2.5 volts) and 36
volts with two external resistors. These devices have a
typical dynamic output impedance of 0.2
Active output
circuit provides a sharp turn-on characteristic, making these
devices excellent replacement for Zener Diodes in many
applications.
1. Ref 2. Anode 3. Cathode
1
TO-92
Internal Block Diagram
2.5 Vref
CATHODE
ANODE
REFERENCE
ANODE(A)
REFERENCE (R)
CATHODE (K)
FAN431/FAN431A/FAN431L
Programmable Shunt Regulator
FAN431/FAN431A/FAN431L
2
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified.)
Note:
1. Thermal resistance test board
Size: 76.2mm * 114.3mm * 1.6mm (1S0P)
JEDEC Standard: JESD51-3, JESD51-7
2. Assume no ambient airflow.
3. T
JMAX
= 150
C
, Ratings apply to ambient temperature at 25
C
4. Power dissipation calculation: P
D
= (T
J
- T
A
)/
R
JA
Recommended Operating Conditions
Parameter
Symbol
Value
Unit
Cathode Voltage
V
KA
37
V
Cathode current Range (Continuous)
I
KA
-100 ~ +150
mA
Reference Input Current Range
I
REF
-0.05 ~ +10
mA
Thermal Resistance Junction-Air (Note1,2)
Z Suffix Package
R
JA
132
C/W
Power Dissipation (Note3,4)
Z Suffix Package
P
D
940
mW
Junction Temperature
T
J
150
C
Operating Temperature Range
T
OPR
-25 ~ +85
C
Storage Temperature Range
T
STG
-65 ~ +150
C
Parameter
Symbol
Min.
Typ.
Max.
Unit
Cathode Voltage
V
KA
V
REF
-
36
V
Cathode Current
I
KA
1.0
-
100
mA
FAN431/FAN431A/FAN431L
3
Electrical Characteristics
(T
A
= +25
C, unless otherwise specified)
Note1
T
MIN
= -25
C, T
MAX
= +85
C
Parameter
Symbol
Conditions
FAN431
FAN431A
FAN431L
Unit
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
Reference
Input Voltage
V
REF
V
KA
=V
REF
, I
KA
=10mA
2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508
V
Deviation of
Reference
Input Voltage
Over-
Temperature
V
REF
/
T
V
KA
=V
REF
, I
KA
=10mA
T
MIN
T
A
T
MAX
-
4.5
17
-
4.5
17
-
4.5
17
mV
Ratio of
Change in
Reference
Input Voltage
V
REF
/
V
KA
I
KA
=10mA
V
KA
=10V-
V
REF
-
-1.0
-2.7
-
-1.0
-2.7
-
-1.0
-2.7
mV/V
to the Change
in Cathode
Voltage
V
KA
=36V-
10V
-
-0.5
-2.0
-
-0.5
-2.0
-
-0.5
-2.0
Reference
Input Current
I
REF
I
KA
=10mA,
R
1
=10k
,R
2
=
-
1.5
4
-
1.5
4
-
1.5
4
A
Deviation of
Reference
Input Current
Over Full
Temperature
Range
I
REF
/
T
I
KA
=10mA,
R
1
=10k
,R
2
=
T
A
=Full Range
-
0.4
1.2
-
0.4
1.2
-
0.4
1.2
A
Minimum
Cathode
Current for
Regulation
I
KA(MIN)
V
KA
=V
REF
-
0.45
1.0
-
0.45
1.0
-
0.45
1.0
mA
Off -Stage
Cathode
Current
I
KA(OFF)
V
KA
=36V, V
REF
=0
-
0.05
1.0
-
0.05
1.0
-
0.05
1.0
A
Dynamic
Impedance
Z
KA
V
KA
=V
REF
,
I
KA
=1 to 100mA ,f
1.0kHz
-
0.15
0.5
-
0.15
0.5
-
0.15
0.5
FAN431/FAN431A/FAN431L
4
Test Circuits
Figure 1. Test Circuit for V
KA
=V
REF
Figure 2. Test Circuit for V
KA
V
REF
FAN431
FAN431
FAN431
Figure 3. Test Circuit for l
KA(OFF)
FAN431/FAN431A/FAN431L
5
Typical Performance Characteristics
-2
-1
0
1
2
3
-100
-50
0
50
100
150
V
KA
= V
REF
T
A
= 25
o
C
I
K
,
C
a
t
h
ode
C
u
r
r
ent
(m
A)
V
KA
, Cathode Voltage (V)
-50
-25
0
25
50
75
100
125
0.000
0.025
0.050
0.075
0.100
I
of
f
,
O
ff-St
a
t
e
C
a
t
h
o
d
e
C
u
rre
n
t
(u
A)
T
A
, Ambient Temperature (
o
C)
1k
10k
100k
1M
10M
-10
0
10
20
30
40
50
60
T
A
= 25
o
C
I
KA
= 10mA
Ope
n
Lo
op Volt
a
ge Gain (dB)
Frequency (Hz)
-1
0
1
2
3
-200
0
200
400
600
800
I
KA(MIN)
V
KA
= V
REF
T
A
= 25
o
C
I
KA
,
CA
T
H
O
D
E
CU
RRE
NT
(
u
A
)
V
KA
, CATHODE VOLTAGE (V)
-50
-25
0
25
50
75
100
125
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
I
re
f
,
R
e
fe
re
n
c
e
In
p
u
t C
u
rre
n
t
(
u
A)
T
A
, Ambient Temperature (
o
C)
0
4
8
12
16
20
0
1
2
3
4
5
6
T
A
=25
o
C
OUTPUT
INPUT
V
o
lt
a
ge S
w
ing
(V)
Time (us)
Figure 4. Cathode Current vs. Cathode Voltage
Figure 5. Cathode Current vs. Cathode Voltage
Figure 6. OFF-State Cathode Current vs.
Ambient Temperature
Figure7. Reference Input Current vs.
Ambient Temperature
Figure 8. Small Signal Voltage Amplification vs. Frequency
Figure 9. Pulse Response