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
18V 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 18V
Wide operating current range 60μA to 120mA
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
CATHODE REF
CATHODE
ANODE
REF
ANODE
2
3
4
NC
NC
1
2
3
1
2
3
2006/10/11
Rev. 7
Champion Microelectronic Corporation
Page 1
CM431L
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
BLOCK DIAGRAM
BLOCK DIAGRAM
SYMBOL DIAGRAM
C a th o d e
Ref
Anode
ORDERING INFORMATION
PACKAGE
0.5%
SOT-23-3
（
1
）
SOT-23-3
（
1
）
SOT-23-5
（
1
）
SOT-89
（
1
）
TOLERANCE
0.7%
CM431LDCM233
CM431LDCM2R3
CM431LDCM235
CM431LDCM89
CM431LDCN
CM431LDCS
1.0%
CM431LBCM233
CM431LBCM2R3
CM431LBCM235
CM431LBCM89
CM431LBCN
CM431LBCS
CM431LGBCM233*
CM431LGBCM2R3*
CM431LGBCM235*
CM431LGBCM89*
CM431LGBCN*
CM431LGBCS*
2.0%
CM431LCCM233
CM431LCCM2R3
CM431LCCM235
CM431LCCM89
CM431LCCN
CM431LCCS
CM431LGCCM233*
CM431LGCCM2R3*
CM431LGCCM235*
CM431LGCCM89*
CM431LGCCN*
CM431LGCCS*
TR=3K
TR=3K
TR=3K
TR=1K
TA=2K
T/R Quantity
TR=3K
TR=3K
TR=3K
TR=1K
TA=2K
CM431LACM233
CM431LACM2R3
CM431LACM235
CM431LACM89
CM431LACN
CM431LACS
TO-92
（
2
）
SOP-8
SOT-23-3
（
1
）
CM431LGACM233* CM431LGDCM233*
SOT-23-3
（
1
）
CM431LGACM2R3* CM431LGDCM2R3*
SOT-23-5
（
1
）
SOT-89
（
1
）
TO-92
（
2
）
SOP-8
Notes：
（1）
Add suffix
″TR″for
Tape & Reel.
（2）
Add suffix
″TA″for
Tape Ammo.
（3）
CM431LGACM235* CM431LGDCM235*
CM431LGACM89*
CM431LGACN*
CM431LGACS*
CM431LGDCM89*
CM431LGDCN*
CM431LGDCS*
*Note:
Add
suffix “G” for Pb Free Product
Champion Microelectronic Corporation
Page 2
2006/10/11
Rev. 7
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 Free Temperature（Soldering）10 seconds
Lead Temperature（Soldering）10 seconds
T
LEAD
T
LEAD
P
D
0.78
0.30
0.30
1.00
0.71
260
250
℃
℃
W
Symbol
V
Z
I
Z
I
REF
T
J
T
STG
θ
JA
160
410
256
110
175
Maximum
18
120
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
℃
2006/10/11
Rev. 7
Champion Microelectronic Corporation
Page 3
CM431L
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
ELECTRICAL CHARACTERISTICS
Unless specified, T
A
= 25℃
Parameter
Reference
Voltage
V
REF
Temp
Deviation
Ratio of Change
in
V
REF
to Change in
Cathode Voltage
Reference Input
Current
I
REF
Temp
Deviation
Off State Cathode
Current
Dynamic Output
Impedance
Minimum
Operating
Current
CM431L 0.5%
CM431L 0.7%
Symbol
Condition
MIN
TYP
MAX MIN TYP MAX UNITS
V
REF
V
z
=V
REF
,
T
A
=25℃
1.234 1.240 1.246 1.231 1.240 1.249
V
I
z
=10mA
1.258 1.222
1.258
T
A
=-40 to+85℃ 1.222
V
DEV
T
A
=-40 to +85℃, V
z
= V
REF
I
z
=10mA
10
25
10
25
mV
ΔV
REF
I
z
=10mA,
ΔV
Z
=16V to V
REF
-1.0
ΔV
z
I
REF
R1=10kΩ, R2=∞, I
z
=10mA
0.15
I
REF
（
DEV
）
T
A
=-40 to +85℃ R1=10 kΩ
R2=
∞,
I
z
=10mA
I
z
（
off
）
r
z
V
REF
=0V
V
Z
=6V
V
Z
=16V
f < 1KHz, V
Z
= V
REF
I
z
=100μA to 100 mA
0.5
0.15
0.5
-2.7
-1.0
-2.7
mV/V
μA
0.1
0.5
0.5
0.25
60
0.4
2.0
2.0
0.4
80
0.1
0.5
0.5
0.25
60
0.4
2.0
2.0
0.4
80
μA
μA
Ω
μA
I
Z
（
min
）
V
Z
= V
REF
2006/10/11
Rev. 7
Champion Microelectronic Corporation
Page 4
CM431L
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
ELECTRICAL CHARACTERISTICS (CONTINUED)
Parameter
Reference
Voltage
V
REF
Temp
Deviation
Ratio of Change
in V
REF
to Change
in Cathode
Voltage
Reference Input
Current
I
REF
Temp
Deviation
Off State Cathode
Current
Dynamic Output
Impedance
Minimum
Operating
Current
Symbol
Condition
V
REF
V
z
=V
REF
,
T
A
=25℃
I
z
=10mA
T
A
=-40 to+85℃ 1.215
V
DEV
T
A
=-40 to +85℃, V
z
= V
REF
I
z
=10mA
Unless specified, T
A
= 25℃
CM431L 1%
CM431L 2%
MIN
TYP MAX MIN TYP MAX
1.228 1.240 1.252 1.215 1.240 1.265
1.265 1.200
10
25
10
1.280
35
UNITS
V
mV
ΔV
REF
I
z
=10mA,
ΔV
Z
=16V to V
REF
-1.0
ΔV
z
I
REF
R1=10kΩ, R2=∞, I
z
=10mA
0.15
I
REF
（
DEV
）
T
A
=-40 to +85℃ R1=10 kΩ
R2=
∞,
I
z
=10mA
I
z
（
off
）
r
z
V
REF
=0V
V
Z
=6V
V
Z
=16V
f < 1KHz, V
Z
= V
REF
I
z
=100μA to 100 mA
0.5
0.15
0.5
-2.7
-1.0
-2.7
mV/V
μA
0.1
0.5
0.5
0.25
60
0.4
2.0
2.0
0.4
80
0.1
0.5
0.5
0.25
60
0.4
2.0
2.0
0.4
60
μA
μA
Ω
μA
I
Z
（
min
）
V
Z
= V
REF
2006/10/11
Rev. 7
Champion Microelectronic Corporation
Page 5
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