AMC DOC. #: AMC431_C
November
2002
Copyright
2002, ADD Microtech Corp.
1
www.addmtek.com
VREF
CATHODE
ANODE
DESCRIPTION
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
VREF and 36V by using two external resistors. The
AMC431 offers low output impedance for improved
load regulation with a typical output impedance of
200m
Ω. 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.
!
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 200m
Ω
Ω
Ω
Ω;
#
Adjustable output voltage from VREF 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.
APPLICATIONS
PACKAGE PIN OUT
3-Pin Plastic TO-92
(Top View)
8-Pin Plastic S.O.I.C.
Surface Mount
(Top View)
!
Voltage Reference
!
Precision shunt regulator
!
High current shunt regulator
!
PWM down converter with
reference
!
Voltage monitor
ORDER INFORMATION
SOIC
TO-92
SOT-89
SOT-23
SOT-23
TA (°C)
Initial
Tolerance DM 8-pin
LP
3-pin
PK
3-pin
DB
3-pin
DB
3-pin
1.5%
--
AMC431CLP
--
--
--
1%
AMC431DM
AMC431LP
AMC431PK
AMC431DB
AMC431RDB
0 to 70
0.5%
--
AMC431BLP
AMC431BPK
AMC431BDB
AMC431BRDB
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.
PRECISION ADJUSTABLE SHUNT
VOLTAGE REFERENCE
AMC431
A
A
A
ADD MICROTECH CORP.
CATHODE
ANODE
VREF
CATHODE
ANODE
VREF
ANODE
NC
ANODE
ANODE
NC
VREF
ANODE
CATHODE
CATHODE
VREF
ANODE
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)