Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
Advanced
AMS431
Monolithic
PRECISION ADJUSTABLE SHUNT REGULATOR
Systems
FEATURES
APPLICATIONS
Trimmed 0.25% Reference
Battery Powered Systems
Wide Operating Current Range 250
A to 150mA
Switching Power Supplies
Low Dynamic Output Impedance
Adjustable Power Supplies
Low Output Noise
Linear Regulators
Nominal Temperature Range to 85
C
Error Amplifiers
Temperature-Compensated: 60ppm/
C
Notebook/Personal Computer
Internal Amplifier with 150mA Capability
Monitors/ VCR/ TV
Pagers
GENERAL DESCRIPTION
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.
PACKAGE TYPE
OPERATING
TO-92
8 LEAD SOIC
SOT-89
3 LEAD SOT-23
TEMP. RANGE
0.25%
AMS431AN
AMS431AS
AMS431AL
AMS431AM
-40 to +85
C
0.5%
AMS431BN
AMS431BS
AMS431BL
AMS431BM
-40 to +85
C
1.0%
AMS431CN
AMS431CS
AMS431CL
AMS431CM
-40 to +85
C
PIN CONNECTIONS
TO-92
8L SOIC
SOT-89
3L SOT-23
Plastic Package (N)
SO Package (S)
(L)
(M)
1
2
3
REF
ANODE
CATHODE
2
8
3
4
7
6
5
ANODE
N/C
N/C
ANODE
ANODE
ANODE
1
REF
CATHODE
1
2
3
CATHODE
ANODE
REF
CATHODE
REF
ANODE
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
)
37V
Internal Power Dissipation (P
D
)
Continuous Cathode Current (I
Z
)
-10mA to +150mA
TO-92 Package
0.78W
Reference Input Current (I
REF
)
10mA
SO-8 Package
0.71W
Junction Temperature (T
J
)
-40
C to +125
C
SOT-89 Package
0.91W
SOT-23 Package
0.28W
Storage temperature
-65
C to +150
C
Thermal Resistance (
JA
)
Lead Temperature (Soldering, 10sec.)
265
C
TO-92 Package
160
C/W
SO-8 Package
175
C/W
SOT-89 Package
110
C/W
SOT-23 Package
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
= +25C unless otherwise specified.
Parameter
Conditions
AMS431A
Min Typ Max
AMS431B
Min Typ Max
AMS431C
Min Typ Max
Units
Reference Voltage
2.489
2.495
2.501
2.483
2.495
2.507
2.470
2.495
2.520
V
Deviation of Reference
Input Voltage over
Temperature
V
Z
= V
REF
(circuit 1)
T
A
= +25
C to +85
C
T
A
= -40
C to +25
C
8.0
8.0
15
15
8.0
8.0
15
15
8.0
8.0
15
15
mV
mV
Ratio of Change in
V
Z
from V
REF
to 10V
-0.5
-2.7
-0.5
-2.7
-0.5
-2.7
mV/V
Reference Voltage to
Cathode Voltage
V
Z
from V
REF
to 36V
-1.0
-2.0
-1.0
-2.0
-1.0
-2.0
mV/V
Reference Input Current
R1 =10k
, R2 =
(test circuit 2)
0.5
4.0
0.5
4.0
0.5
4.0
A
Reference Input Current
Deviation over
Temperature
R1 =10k
, R2 =
T
A
= Full Range
(test circuit 2)
0.4
1.2
0.4
1.2
0.4
1.2
A
Off State Cathode
Current
V
Z
= 36V, V
REF
= 0V
( test circuit 3)
0.04
0.5
0.04
0.5
0.04
0.5
A
Dynamic Output
Impedance
f < 1KHz, V
Z
= V
REF
I
Z
=100
A to 100mA
(test circuit 1)
0.25
0.5
0.25
0.5
0.25
0.5
Minimum Operating
Current
V
Z
= V
REF
(test circuit 1)
100
250
100
250
100
250
A
RECOMMENDED OPERATING CONDITIONS:
Min
Max
Cathode Voltage, (V
Z
)
V
REF
36 V
Cathode Current, (I
Z
)
0.25mA
120mA
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
TEST CIRCUITS
V
IN
I
REF
I
Z
V
Z
= V
REF
V
REF
V
IN
V
Z
I
Z
V
REF
I
REF
R1
R2
V
IN
V
Z
I
Z
OFF
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
Shunt Regulator
Single Supply Comparator with
Temperature Compensated Threshold
V+
V
REF
R2
R1
V
O
V
O
(1+R1/R2)V
REF
V
ON
2V
V
OFF
= V+
V+
OUT
GND
IN
V
TH
2.5V
Series Regulator
Higher Current Shunt Regulator
V+
R2
R1
V
O
0.01
F
30
V
O
(1+R1/R2)V
REF
R1
R1
V
O
V+
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
Voltage Monitor
R1A
R2A
R1B
R2B
OUT ON
WHEN
LOW
<
V+
<
HIGH
LIMIT LIMIT
V+
LOW LIMIT
V
REF
( 1+R1B/R2B)+V
BE
LOW LIMIT
V
REF
( 1+R1A/R2A)
R1A
R2A
V+
R2B
R1B
LOW LIMIT
V
REF
( 1+R1B/R2B)+V
BE
LED ON WHEN
LOW LIMIT
V
REF
( 1+R1A/R2A) LOW LIMIT < V
+
< HIGH LIMIT
Delay Timer
Current Limiter or Current Source
C
R
ON
OFF
V+
DELAY = R*C*
l
n
*V+/(V+)-V
REF
V+
R
CL
I
O
I
O
=V
REF
/R
CL
Constant Current Sink
V+
R
S
I
O
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
0
100
200
300
400
500
0
1.0
2.0
3.0
Input Current vs V
Z
CATHODE VOLTAGE (V)
INPUTT CURRENT (
A)
= 25
C
V
Z
= V
REF
25
70
85
1000
500
125
REFERENCE VOLTAGE (V)
Thermal Information
TEMPERATURE ( C)
100
0
50
100
150
0
1.0
2.0
3.0
Input Current vs V
Z
CATHODE VOLTAGE (V)
INPUTT CURRENT (
mA)
= 25
C
V
Z
= V
REF
SOT-89
SOT-23
SO-8
TO-92
I
Z
MIN
PACKAGE DIMENSIONS
inches (millimeters) unless otherwise noted.
3L TO-92 PLASTIC PACKAGE (N)
0.1400.010
(3.5560.127)
0.0600.010
(1.5240.254)
0.0150.002
(0.3810.051)
0.0160.003
(0.4060.076)
0.0500.005
(1.2700.127)
0.0600.005
(1.5240.127)
DIA
0.1800.005
(4.5720.127)
0.1800.005
(4.5720.127)
0.050
(1.270)
MAX
0.500
(12.70)
MIN
UNCONTROLLED
LEAD DIMENSIONS
10
NOM
5 NOM
N (TO-92 ) AMS DRW# 042391
0.90
(2.286)
NOM
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
PACKAGE DIMENSIONS
inches (millimeters) unless otherwise noted (Continued).
8 LEAD SOIC PLASTIC PACKAGE (S)
SOT-89 PLASTIC PACKAGE (L)
0-8 TYP
0.010-0.020
(0.254-0.508)
S (SO-8 ) AMS DRW# 042293
x 45
0.016-0.050
(0.406-1.270)
0.008-0.010
(0.203-0.254)
0.004-0.010
(0.101-0.254)
0.014-0.019
(0.355-0.483)
0.053-0.069
(1.346-1.752)
0.050
(1.270)
TYP
0.150-0.157**
(3.810-3.988)
0.228-0.244
(5.791-6.197)
0.189-0.197*
(4.801-5.004)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
2
3
4
8
7
6
5
0.090-0.102
(2.29-2.60)
0.173-0.181
(4.40-4.60)
0.064-0.072
(1.62-1.83)
0.155-0.167
(3.94-4.25)
0.059
(1.50)
BSC
0.035-0.047
(0.89-1.20)
L (SOT-89 ) AMS DRW# 042392
0.118
(3.00)
BSC
0.014-0.019
(0.36-0.48)
0.017-0.022
(0.44-0.56)
0.084-0.090
(2.13-2.29)
0.055-0.063
(1.40-1.60)
0.014-0.017
(0.35-0.44)
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
PACKAGE DIMENSIONS
inches (millimeters) unless otherwise noted (Continued).
3 LEAD SOT-23 PLASTIC PACKAGE (M)
0.047-0.055
(1.194-1.397)
0.015-0.017
(0.381-0.432)
0.110-0.120
(2.794-3.048)
0.083-0.098
(2.108-2.489)
0.035-0.040
(0.889-1.016)
0.070-0.080
(1.778-2.032)
0.018-0.024
(0.457-0.610)
10
NOM
0.0034-0.0050
(0.086-0.127)
(SOT-23 ) AMS DRW# 051991
0.035-0.041
(0.089-1.041)
0.0005-0.0040
(0.013-0.102)
0.018-0.024
(0.457-0.610)
10
NOM
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