CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
GENERAL DESCRIPTION
FEATURES
LOW voltage operation（1.24V）
Adjustable output voltage V0 = VREF to 20V
Wide operating current range 60
μA to 100mA
LOW dynamic output impedance 0.25
Ω typ.
Trimmed bandgap design
± 0.5%
APPLICATIONS
The CM431L is a low voltage three terminal adjustable shunt
regulator with thermal stability guaranteed over temperature.
The output voltage can be adjusted to any value from 1.24V
（
VREF）to 20V with two external resistors. The CM431L has a
typical dynamic output impedance of 0.25
Ω. Active output
circuitry provides a very sharp turn on characteristic, making
the CM431L an excellent replacement for zener diodes.
The CM431L shunt regulator is available in four voltage
tolerances（0.5%, 0.7%, 1.0% and 2.0%）and four package
options (SOT-23-3, SOT-23-5, SOT-89, TO-92, and SOP-8).
Four voltage tolerances allow the designer the opportunity to
select the proper cost/tolerance for their application.
Linear Regulators
Adjustable Supplies
Switching Power Supplies
Battery Operated Computers
Instrumentation
Computer Disk Drivers
PIN CONFIGURATION
TO-92
Front View
1
23
SOT-23-3
Top View
1
3
2
CM431LXCM233 CM431LXCM2R3
Pin 1
REF
CATHODE
Pin 2
CATHODE
REF
Pin 3
ANODE
ANODE
Suffix “X”: Grade “A”, “B”, “C”, or “D”
2006/02/10 Rev. 5
Champion Microelectronic Corporation
Page 1
SOT-23-5
Top View
1
5
3
2
4
SOT-89
Top View
1
23
SOP-8
Top View
1
2
3
4
8
7
6
5
CATHODE
NC
NC
NC
REF
NC
ANODE
NC
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