CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
GENERAL DESCRIPTION
FEATURES
The CM431 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
CM431 offers low output impedance for improved load regulation
with a typical output impedance of 200mΩ. Because of the
active output circuitry, the CM431 can 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 1.0%.
Sink current capability from 1mA to 100mA
Typical output dynamic impedance less than 200mΩ;
Adjustable output voltage from VREF to 36V
Available in SOT-23, SOT-89, TO-92, & SOP-8
Low output noise
Typical equivalent full range temperature coefficient of
30ppm/OC
APPLICATIONS
Voltage Reference
Precision shunt regulator
High current shunt regulator
PWM down converter with reference
Voltage monitor
PIN CONFIGURATION
TO-92
SOT-23-3
Front View
Top View
3
CM431XCM233
REF
CM431XCM2R3
CATHODE
REF
Pin 1
Pin 2
Pin 3
CATHODE
ANODE
ANODE
Suffix “X”: Grade “A”, “B”, “C”, or “D”
2
1
2
3
1
SOT-23-5
Top View
SOT-89
SOP-8
Top View
Top View
5
4
1
2
3
4
REF
8
7
6
5
CATHODE
NC
ANODE
NC
NC
NC
NC
2
3
1
1
2
3
2006/10/11 Rev.1.4
Champion Microelectronic Corporation
Page 1
CHAMP [ CHAMPION MICROELECTRONIC CORP. ]
