CM431L
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
GENERAL DESCRIPTION
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
（V
REF
）to
20V with two external resistors. The CM431L has a
typical dynamic output impedance of 0.25Ω. 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.
FEATURES
!
!
!
!
!
LOW voltage operation（1.24V）
Adjustable output voltage V
0
= V
REF
to 20V
Wide operating current range 60µA to 100mA
LOW dynamic output impedance 0.25Ω typ.
Trimmed bandgap design
±
0.5%
APPLICATIONS
!
!
!
!
!
!
Linear Regulators
Adjustable Supplies
Switching Power Supplies
Battery Operated Computers
Instrumentation
Computer Disk Drivers
PIN CONFIGURATION
TO-92
Front View
CATHODE
SOT-23-3
Top View
3
REF
ANODE
Pin 1
Pin 2
Pin 3
CM431LXCM233
REF
CATHODE
ANODE
CM431LXCM2R3
CATHODE
REF
ANODE
Suffix “X”: Grade “A”, “B”, “C”, or “D”
1
1
2
3
2
SOT-23-5
Top View
5
4
SOT-89
Top View
1
SOP-8
Top View
C OE
ATH D
N
C
N
C
N
C
R
EF
N
C
AN D
OE
N
C
8
7
6
5
CATHO DE REF
CATHODE
ANO DE
REF
ANO DE
2
3
4
NC
NC
1
2
3
1
2
3
2002/05/14
Rev. 3
Champion Microelectronic Corporation
Page 1
CM431L
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
ABSOULTE MAXIMUM RATINGS
Parameter
Cathode Voltage
Continuous Cathode Current
Reference Current
Operating Junction Temperature Range
Storage Temperature Range
Thermal Resistance
TO-92
SOT-23-3
SOT-23-5
SOT-89
SOP-8
Power Dissipation at T
A
=25℃
TO-92
SOT-23-3
SOT-23-5
SOT-89
SOP-8
Lead Temperature（Soldering）10 seconds
T
LEAD
P
D
0.78
0.30
0.30
1.00
0.71
250
℃
W
Symbol
V
Z
I
Z
I
REF
T
J
T
STG
θ
JA
160
410
256
110
175
Maximum
20
100
3
-40 to +150
-65 to + 150
Units
V
mA
mA
℃
℃
℃/W
RECOMMENDED OPERATING CONDITION
Min
Cathode Voltage. V
z
Cathode Current. I
z
Operating Temperature
V
REF
80
0
Max
16
100
105
Symbol
V
mA
℃
2002/05/14
Rev. 3
Champion Microelectronic Corporation
Page 3
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