The AMS431 is a three-terminal adjustable shunt regulator with guaranteed temperature stability over the entire range of
operation. The output voltage can be set to any value between 2.5V (VREF) and 36V by adding two external resistors. Due to
the sharp turn-on characteristics this device is an excellent replacement for zener diodes in many applications.
AMS431 is available in TO-92, SO-8, SOT-89 and SOT-23 packages.
ORDERING INFORMATION:
TOL.
±0.25%
±0.5%
±1.0%
TO-92
AMS431AN
AMS431BN
AMS431CN
PACKAGE TYPE
8 LEAD SOIC
AMS431AS
AMS431BS
AMS431CS
SOT-89
AMS431AL
AMS431BL
AMS431CL
3 LEAD SOT-23
AMS431AM
AMS431BM
AMS431CM
OPERATING
TEMP. RANGE
-40 to +85° C
-40 to +85° C
-40 to +85° C
PIN CONNECTIONS
TO-92
Plastic Package (N)
8L SOIC
SO Package (S)
SOT-89
(L)
3L SOT-23
(M)
ANODE
1
2
3
CATHODE
ANODE
ANODE
1
2
3
4
8
7
6
5
REF
ANODE
ANODE
N/C
REF
ANODE
CATHODE
N/C
1
REF
2
3
REF
CATHODE
ANODE CATHODE
Bottom View
Top View
Top View
Top View
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Cathode Voltage (V
Z
)
Continuous Cathode Current (I
Z
)
Reference Input Current (I
REF
)
Junction Temperature (T
J
)
Storage temperature
Lead Temperature (Soldering, 10sec.)
37V
-10mA to +150mA
10mA
-40°C to +125°C
-65°C to +150°C
265°C
Internal Power Dissipation (P
D
)
TO-92 Package
SO-8 Package
SOT-89 Package
SOT-23 Package
Thermal Resistance (ϕ
JA
)
TO-92 Package
SO-8 Package
SOT-89 Package
SOT-23 Package
0.78W
0.71W
0.91W
0.28W
160°C/W
175°C/W
110°C/W
410°C/W
Note 1 :
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics
.
The
guaranteed specifications apply only for the test conditions listed.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
Z
=10 mA and T
A
= +25°C unless otherwise specified.
Parameter
Reference Voltage
Deviation of Reference
Input Voltage over
Temperature
Ratio of Change in
Reference Voltage to
Cathode Voltage
Reference Input Current
Reference Input Current
Deviation over
Temperature
Off State Cathode
Current
Dynamic Output
Impedance
Minimum Operating
Current
V
Z
= V
REF
(circuit 1)
T
A
= +25°C to +85°C
T
A
= -40°C to +25°C
V
Z
from V
REF
to 10V
V
Z
from V
REF
to 36V
R1 =10kΩ, R2 =
∞Ω
(test circuit 2)
R1 =10kΩ, R2 =
∞Ω
T
A
= Full Range
(test circuit 2)
V
Z
= 36V, V
REF
= 0V
( test circuit 3)
f < 1KHz, V
Z
= V
REF
I
Z
=100µA to 100mA
(test circuit 1)
V
Z
= V
REF
(test circuit 1)
100
250
100
250
100
250
µA
Conditions
Min
2.489
AMS431A
Typ
Max
2.495
8.0
8.0
-0.5
-1.0
0.5
2.501
15
15
-2.7
-2.0
4.0
Min
2.483
AMS431B
Typ
2.495
8.0
8.0
-0.5
-1.0
0.5
Max
2.507
15
15
-2.7
-2.0
4.0
AMS431C
Min
Typ
Max
2.470
2.495
8.0
8.0
-0.5
-1.0
0.5
2.520
15
15
-2.7
-2.0
4.0
Units
V
mV
mV
mV/V
mV/V
µA
0.4
1.2
0.4
1.2
0.4
1.2
µA
µA
Ω
0.04
0.25
0.5
0.5
0.04
0.25
0.5
0.5
0.04
0.25
0.5
0.5
RECOMMENDED OPERATING CONDITIONS:
Min
V
REF
0.25mA
Max
36 V
120mA
Cathode Voltage, (V
Z
)
Cathode Current, (I
Z
)
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
TEST CIRCUITS
V
IN
V
Z
= V
REF
V
IN
V
Z
V
IN
V
Z
I
REF
I
Z
V
REF
R1
I
REF
I
Z
I
Z
OFF
R2
V
REF
Figure 1.
Test Circuit for V
Z
=V
REF
Figure 2.
Test Circuit for V
REF
vs I
Z
.
Test circuit for I
REF
.
Figure 3.
Test Circuit for Off-State Current
TYPICAL APPLICATIONS
Single Supply Comparator with
Temperature Compensated Threshold
V
O
R1
V
REF
R2
IN
V
TH
≈
2.5V
V+
Shunt Regulator
V+
OUT
V
ON
≈
2V
V
OFF
= V+
V
O
≈
(1+R1/R2)V
REF
GND
Series Regulator
V+
V+
Higher Current Shunt Regulator
V
O
30Ω
R1
0.01µF
R1
V
O
R2
R1
V
O
≈
(1+R1/R2)V
REF
V
O
≈
(1+R1/R2)V
REF
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
TYPICAL APPLICATIONS
(Continued)
Over Voltage/Under Voltage
Protection Circuit
V+
R1B
OUT ON
WHEN
LOW
<
V+
<
HIGH
LIMIT
LIMIT
Voltage Monitor
V+
R1B
R1A
R1A
R2A
R2B
R2A
R2B
LOW LIMIT
≈
V
REF
( 1+R1B/R2B)+V
BE
LOW LIMIT
≈
V
REF
( 1+R1A/R2A)
LOW LIMIT
≈
V
REF
( 1+R1B/R2B)+V
BE
LOW LIMIT
≈
V
REF
( 1+R1A/R2A)
LED ON WHEN
LOW LIMIT < V
+
< HIGH LIMIT
Delay Timer
V+
Current Limiter or Current Source
I
O
V+
R
CL
R
OFF
ON
C
DELAY = R*C*ln*V+/(V+)-V
REF
I
O
=V
REF
/R
CL
Constant Current Sink
V+
I
O
R
S
I
O
= V
REF
/R
S
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
TYPICAL PERFORMANCE CHARACTERISTICS
Input Current vs V
Τ
Α
= 25°C
V
Z
= V
REF
Z
Thermal Information
1000
REFERENCE VOLTAGE (V)
SOT-89
Input Current vs V
Z
150
INPUTT CURRENT (mA)
Τ
Α
= 25°C
V
Z
= V
REF
INPUTT CURRENT (µA)
500
400
300
200
100
0
0
1.0
2.0
CATHODE VOLTAGE (V)
3.0
I
Z
MIN
100
500
TO-92
SO-8
50
SOT-23
100
0
25
70 85
125
TEMPERATURE (° C)
0
1.0
2.0
CATHODE VOLTAGE (V)
3.0
PACKAGE DIMENSIONS
inches (millimeters) unless otherwise noted.
3L TO-92 PLASTIC PACKAGE (N)
0.060±0.005
(1.524±0.127)
DIA
0.180±0.005
(4.572±0.127)
0.060±0.010
(1.524±0.254)
0.140±0.010
(3.556±0.127)
0.180±0.005
(4.572±0.127)
0.90
(2.286)
NOM
5° NOM
0.500
(12.70)
MIN
10°
NOM
0.050
(1.270)
MAX
UNCONTROLLED
LEAD DIMENSIONS
0.050±0.005
(1.270±0.127)
0.016±0.003
(0.406±0.076)
0.015±0.002
(0.381±0.051)
N (TO-92 ) AMS DRW# 042391
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
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