CM431L
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
GENERAL DESCRIPTION
FEATURES
LOW voltage operation1.24V
Adjustable output voltage V
0
= V
REF
to 20V
Wide operating current range 60
A to 100mA
LOW dynamic output impedance 0.25
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
V
REF
to 20V with two external resistors. The CM431L has a
typical dynamic output impedance of 0.25
. 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
tolerances0.5%, 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
2
3
REF
AN
O
D
E
CAT
H
O
D
E
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
NC
A
NO
D
E
CA
T
H
O
D
E
2
4
RE
F
NC
SOT-89
Top View
1
2
3
RE
F
AN
O
D
E
CA
T
H
ODE
SOP-8
Top View
1
2
3
4
8
7
6
5
CATHODE
NC
NC
NC
REF
NC
ANODE
NC
CM431L
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
BLOCK DIAGRAM
BLOCK DIAGRAM
SYMBOL DIAGRAM
Cathode
Anode
Ref
2006/02/10
Rev. 5
Champion Microelectronic Corporation
Page 2
CM431L
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
2006/02/10
Rev. 5
Champion Microelectronic Corporation
Page 3
ORDERING INFORMATION
PACKAGE TOLERANCE
0.5%
0.7%
1.0%
2.0% T/R
Quantity
SOT-23-3
1
CM431LACM233
CM431LDCM233 CM431LBCM233 CM431LCCM233
TR=3K
SOT-23-3
1
CM431LACM2R3
CM431LDCM2R3 CM431LBCM2R3 CM431LCCM2R3
TR=3K
SOT-23-5
1
CM431LACM235
CM431LDCM235 CM431LBCM235 CM431LCCM235
TR=3K
SOT-89
1
CM431LACM89 CM431LDCM89 CM431LBCM89 CM431LCCM89
TR=1K
TO-92
2
CM431LACN CM431LDCN CM431LBCN CM431LCCN
TA=2K
SOP-8 CM431LACS
CM431LDCS
CM431LBCS
CM431LCCS
SOT-23-3
1
CM431LGACM233* CM431LGDCM233*
CM431LGBCM233*
CM431LGCCM233* TR=3K
SOT-23-3
1
CM431LGACM2R3* CM431LGDCM2R3*
CM431LGBCM2R3* CM431LGCCM2R3* TR=3K
SOT-23-5
1
CM431LGACM235* CM431LGDCM235*
CM431LGBCM235*
CM431LGCCM235* TR=3K
SOT-89
1
CM431LGACM89*
CM431LGDCM89*
CM431LGBCM89*
CM431LGCCM89* TR=1K
TO-92
2
CM431LGACN* CM431LGDCN* CM431LGBCN* CM431LGCCN*
TA=2K
SOP-8 CM431LGACS*
CM431LGDCS* CM431LGBCS* CM431LGCCS*
Notes
1 Add suffix
TRfor Tape & Reel.
2 Add suffix
TAfor Tape Ammo.
3
*Note: Add
suffix "G" for Pb Free Product
CM431L
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
2006/02/10
Rev. 5
Champion Microelectronic Corporation
Page 4
ABSOULTE MAXIMUM RATINGS
Parameter Symbol
Maximum
Units
Cathode Voltage
V
Z
20 V
Continuous Cathode Current
I
Z
100 mA
Reference Current
I
REF
3 mA
Operating Junction Temperature Range
T
J
-40 to +150
Storage Temperature Range
T
STG
-65 to + 150
Thermal Resistance
TO-92
SOT-23-3
SOT-23-5
SOT-89
SOP-8
JA
160
410
256
110
175
/W
Power Dissipation at T
A
=25
TO-92
SOT-23-3
SOT-23-5
SOT-89
SOP-8
P
D
0.78
0.30
0.30
1.00
0.71
W
Lead TemperatureSoldering10 seconds
T
LEAD
250
RECOMMENDED OPERATING CONDITION
Min
Max
Symbol
Cathode Voltage. V
z
V
REF
16 V
Cathode Current. I
z
80 100 mA
Operating Temperature
0
105
CM431L
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
ELECTRICAL CHARACTERISTICS
Unless specified, T
A
= 25
CM431L 0.5%
CM431L 0.7%
Parameter Symbol
Condition
MIN
TYP
MAX
MIN
TYP
MAX UNITS
T
A
=25 1.234 1.240 1.246 1.231
1.240
1.249
Reference
Voltage
V
REF
V
z
=V
REF
,
I
z
=10mA
T
A
=-40 to+85 1.222
1.258 1.222 1.258
V
V
REF
Temp
Deviation
V
DEV
T
A
=-40 to +85, V
z
= V
REF
I
z
=10mA
10 25 10 25 mV
Ratio of Change
in
V
REF
to Change in
Cathode Voltage
V
REF
V
z
I
z
=10mA, V
Z
=16V to V
REF
-1.0 -2.7 -1.0 -2.7
mV/V
Reference Input
Current
I
REF
R1=10k, R2=, I
z
=10mA
0.15
0.5 0.15
0.5
A
I
REF
Temp
Deviation
I
REF
DEV
T
A
=-40 to +85 R1=10 k
R2= , I
z
=10mA
0.1 0.4 0.1 0.4
A
V
Z
=6V
0.5
2.0
0.5
2.0
Off State Cathode
Current
I
z
off
V
REF
=0V
V
Z
=16V
0.5
2.0
0.5
2.0
A
Dynamic Output
Impedance
r
z
f < 1KHz, V
Z
= V
REF
I
z
=100
A to 100 mA
0.25
0.4 0.25
0.4
Minimum
Operating
Current
I
Z
min
V
Z
= V
REF
60 80 60 80
A
2006/02/10
Rev. 5
Champion Microelectronic Corporation
Page 5
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