AMC D
OC
. #: AMC431_C
November 2002
A
DD MICROTECH CORP.
DESCRIPTION
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AMC431
P
RECISION
A
DJUSTABLE
S
HUNT
V
OLTAGE
R
EFERENCE
FEATURES
The AMC431 is a three-terminal adjustable shunt
voltage regulator with specified thermal stability and
pin-to-pin compatible with the earlier 431 series. The
output voltage can be adjusted to any value between
V
REF
and 36V by using two external resistors. The
AMC431 offers low output impedance for improved
load regulation with a typical output impedance of
200mΩ. Because of the active output circuitry, the
AMC431can replace the zener diodes in applications
such as switching power supplies, OVP crowbar
circuits, references for A/D, D/A converters with
improved turn-on characteristics.
APPLICATIONS
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Initial voltage reference accuracy of
0.5%, 1.0%, and 1.5%
Sink current capability from 1mA to
100mA
Typical output dynamic impedance less
than 200mΩ;
Ω
Adjustable output voltage from V
REF
to 36V
Available in 3L-TO92 and surface mount
SOT89, SOT23 and 8 pin S.O.I.C. packages
Low output noise
Typical equivalent full range temperature
coefficient of 30ppm/°C
Pin assignment identical to earlier TL431
series.
PACKAGE PIN OUT
Voltage Reference
Precision shunt regulator
High current shunt regulator
PWM down converter with
reference
Voltage monitor
CATHODE
ANODE
V
REF
CATHODE
ANODE
ANODE
NC
V
REF
ANODE
ANODE
NC
3-Pin Plastic TO-92
(Top View)
V
REF
ANODE
8-Pin Plastic S.O.I.C.
Surface Mount
(Top View)
CATHODE
ANODE
CATHODE
V
REF
CATHODE
ANODE
V
REF
3-Pin Plastic SOT-89
Surface Mount
(Top View)
(Note 1)
3-Pin Plastic SOT-23
Surface Mount
(Top View)
(Note 2)
3-Pin Plastic SOT-23
Surface Mount
(Top View)
ORDER INFORMATION
T
A
(°C)
Initial
Tolerance
DM
SOIC
8-pin
--
LP
TO-92
3-pin
PK
SOT-89
3-pin
--
DB
SOT-23
3-pin
--
DB
SOT-23
3-pin
--
1.5%
AMC431CLP
AMC431LP
0 to 70
1%
AMC431DM
AMC431PK
AMC431DB
AMC431RDB
0.5%
AMC431BPK
AMC431BDB
AMC431BRDB
--
AMC431BLP
Note: 1. For AMC431DB and AMC431BDB.
2. For AMC431RDB and AMC431BRDB.
3. For surface-mount and TO-92 packages in Tape & Reel, add suffix “T” (e.g., AMC431LPT,
AMC431DBT).
4. For TO-92 in Tape & Box (without reel), add suffix “TB” (e.g., AMC431LPTB).
5. DB package is only available in Tape & Reel.
Copyright
2002, ADD Microtech Corp.
1
www.addmtek.com
AMC D
OC
. #: AMC431_C
November
2002
AMC431
P
RECISION
A
DJUSTABLE
S
HUNT
V
OLTAGE
R
EGULATORS
BLOCK DIAGRAM
TYPICAL APPLICATION
V
O
= 5V
V+
R
b
CATHODE
Note: R
b
should
provide cathode
current
≥
1mA
R1
27.5K
0.1%
R2
27.5K
0.1%
REF
+
-
V
REF
ANODE
5V Precision Regulator
ABSOLUTE MAXIMUM RATINGS
(Note 1)
-0.3V to 37V
Cathode to Anode Voltage (V
KA
)
(Note 2)
-100mA to 150mA
Continuous Cathode Current (I
K
)
-50uA to 10mA
Reference Input Current (I
REF
)
150°C
Maximum junction temperature range, T
J
Storage temperature range
-65
O
C to 150
O
C
Lead temperature (soldiering, 10 seconds)
260°C
Note 1: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.
Currents are positive into, negative out of the specified terminal.
Note 2:
Voltage values are with respect to the anode terminal unless otherwise noted.
POWER DISSIPATION TABLE
Package
θ
JA
Derating factor D
F
(mW/°C)
T
A
≥
25°C
(°C /W )
DM
LP
PK
165
156
71(note)
6.06
6.41
14.1
T
A
≤
25°C
Power rating(mW)
757
801
1763
T
A
=70°C
Power rating(mW)
485
513
1128
T
A
= 85°C
Power rating (mW)
394
417
916
228
DB
285
3.5
438
280
Note :
1. For PK package, Thermal Resistance-Junction to Tab (
θ
JT
) = 35°C /W. T
J
= T
TAB
+ (P
D
× θ
JT
).
P
D
: Power Dissipation.
2.
θ
JA
: Thermal Resistance-Junction to Ambient, D
F
= 1/θ
JA
Junction Temperature Calculation: T
J
= T
A
+ (P
D
× θ
JA
).
The
θ
JA
numbers are guidelines for the thermal performance of the device/PC-board system.
All of the above assume no ambient airflow.
Copyright
2002, ADD Microtech Corp.
2
www.addmtek.com
AMC D
OC
. #: AMC431_C
November
2002
AMC431
P
RECISION
A
DJUSTABLE
S
HUNT
V
OLTAGE
R
EGULATORS
RECOMMENDED OPERATING CONDITIONS
Operating free air temperature range, T
A
Cathode current, I
K
Cathode voltage, V
KA
Min
0
1
0
Max
70
100
36
Units
°C
mA
V
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the operating ambient temperatures with T
A
= 25°C.
Parameter
Reference Input Voltage
Reference Input Voltage
Reference Input Voltage
Reference Drift
Voltage Ratio, Ref to Cathode
(note 4)
Reference Input Current
Symbol
V
REF
V
REF
V
REF
Test Conditions
AMC431
Min Typ Max
Units
I
K
= 10mA, V
KA
= V
REF
, note 1
2.475 2.500 2.525 V
I
K
= 10mA, V
KA
= V
REF
, note 2
2.462 2.500 2.538 V
I
K
= 10mA, V
KA
= V
REF
, note 3
2.487 2.500 2.513 V
4
17
mV
I
K
= 10mA, V
KA
= V
REF
, 0°C
≤
T
A
≤
70°C
I
K
= 10mA, V
KA
= 2.5V to 36V
-1.4 -2.7 mV/V
2
0.4
0.1
0.2
2.3
4
1
1
0.5
µA
mA
µA
Ω
I
K
= 10mA,V
KA
= V
REF
I
K
= 10mA,V
KA
= V
REF
, 0°C
≤
T
A
≤
70°C
Minimum Operating Current
I
MIN
V
KA
= V
REF
V
KA
= 36V, V
REF
= 0V
Off-State Cathode Current
I
OFF
V
KA
= V
REF
, I
K
= 1mA to 100mA,
Dynamic Impedance
|Z
KA
|
f
≤
1kHz
Note 1: For AMC431 only. The output accuracy is 1.0%.
Note 2: For AMC431C only. The output accuracy is 1.5%.
Note 3: For AMC431B only. The output accuracy is 0.5%.
V
REF
Note 4:
Ratio of change in reference input voltage to the change in cathode voltage
V
KA
I
REF
Copyright
2002, ADD Microtech Corp.
3
www.addmtek.com
AMC D
OC
. #: AMC431_C
November
2002
AMC431
P
RECISION
A
DJUSTABLE
S
HUNT
V
OLTAGE
R
EGULATORS
PARAMETER MEASUREMENT INFORMATION
Input
V
KA
Input
V
KA
R1
I
REF
R2
V
RE
Figure 1.
Test Circuit for V
KA
= V
REF
Figure 2.
Test Circuit for V
KA
>
V
REF
Input
V
KA
I
OFF
Figure 3.
Test Circuit for I
OFF
Copyright
2002, ADD Microtech Corp.
4
www.addmtek.com
AMC D
OC
. #: AMC431_C
November
2002
AMC431
P
RECISION
A
DJUSTABLE
S
HUNT
V
OLTAGE
R
EGULATORS
CHARACTERIZATION CURVES
CATHODE CURRENT
vs
CATHODE VOLTAGE
150
125
100
I
KA
– Cathode Current (mA)
I
KA
– Cathode Current (µA)
µ
75
50
25
0
-25
-50
-75
-100
-2
-1
0
1
V
KA
– Cathode Voltage (V)
2
3
-200
-1
V
KA
= V
REF
T
A
= 25°C
°
600
800
CATHODE CURRENT
vs
CATHODE VOLTAGE
V
KA
= V
REF
T
A
= 25°C
°
I
min
400
200
0
0
1
V
KA
– Cathode Voltage (V)
2
3
REFERENCE INPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
V
REF
– Reference Input Voltage (mV)
2600
I
REF
– Reference Input Current (µA)
µ
2580
2560
2540
2520
I
KA
= 100mA
2500
2480
2460
2440
2420
2400
-75
-50
-25
0
25
50
75
100
125
0
T
A
– Free-Air Temperature -
°
C
-75
I
KA
= 10mA
V
KA
= V
REF
5
REFERENCE INPUT CURRENT
vs
FREE-AIR TEMPERATURE
R1 = 10 k
Ω
R2 =
∞
I
KA
= 10mA
4
3
2
1
-50 -25
0
25
50
75
T
A
– Free-Air Temperature -
°
C
100
125
Copyright
2002, ADD Microtech Corp.
5
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