CM431A
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
2004/08/27 Champion Microelectronic Corporation
Page 1
GENERAL DESCRIPTION
FEATURES
Initial voltage reference accuracy of 1.0%.
Sink current capability from 1mA to 100mA
Typical output dynamic impedance less than 200m
;
Adjustable output voltage from V
REF
to 18V
Available in SOT-23, SOT-89, TO-92, & SOP-8
Low output noise
Typical equivalent full range temperature coefficient of
30ppm/
O
C
APPLICATIONS
The CM431A 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 V
REF
and 18V by using two external resistors.
The CM431A offers low output impedance for improved load
regulation with a typical output impedance of 200m
. Because
of the active output circuitry, the CM431A 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.
Voltage Reference
Precision shunt regulator
High current shunt regulator
PWM down converter with reference
Voltage monitor
PIN CONFIGURATION
TO-92
Front View
1
2
3
RE
F
ANODE
CAT
H
O
D
E
SOT-23-3
Top View
1
3
2
SOT-23-5
Top View
1
5
3
NC
AN
O
D
E
CATH
O
D
E
2
4
RE
F
NC
SOT-89
Top View
1
2
3
REF
ANO
D
E
CATHO
D
E
SOP-8
Top View
1
2
3
4
8
7
6
5
CATHODE
NC
NC
NC
REF
NC
ANODE
NC
CM431AXCM233 CM431AXCM2R3
Pin 1
REF
CATHODE
Pin 2
CATHODE
REF
Pin 3
ANODE
ANODE
Suffix "X": Grade "A", "B", "C", "D", or "E"
CM431A
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
2004/08/27 Champion Microelectronic Corporation
Page 2
TYPICAL APPLICATION
BLOCK DIAGRAM
5V Precision Regulator
+
-
V
O
= 5V
V+
CATHODE
R
b
R1
27.5K
0.1%
REF
Note: R
b
should
provide cathode
current
1mA
R2
27.5K
0.1%
V
REF
ANODE
CM431A
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
2004/08/27 Champion Microelectronic Corporation
Page 3
ORDERING INFORMATION
PACKAGE TOLERANCE
0.5% 1.0% 1.5% T/R
Quantity
SOT-23-3
1
CM431AACM233 CM431ABCM233 CM431AECM233
TR=3K
SOT-23-3
1
CM431AACM2R3 CM431ABCM2R3 CM431AECM2R3
TR=3K
SOT-23-5
1
CM431AACM235 CM431ABCM235 CM431AECM235
TR=3K
SOT-89
1
CM431AACM89 CM431ABCM89 CM431AECM89
TR=1K
TO-92
2
CM431AACN CM431ABCN CM431AECN
TA=2K
SOP-8
CM431AACS CM431ABCS CM431AECS
SOT-23-3
1
CM431AGACM233* CM431AGBCM233* CM431AGECM233*
TR=3K
SOT-23-3
1
CM431AGACM2R3* CM431AGBCM2R3* CM431AGECM2R3*
TR=3K
SOT-23-5
1
CM431AGACM235* CM431AGBCM235* CM431AGECM235*
TR=3K
SOT-89
1
CM431AGACM89* CM431AGBCM89* CM431AGECM89*
TR=1K
TO-92
2
CM431AGACN* CM431AGBCN* CM431AGECN*
TA=2K
SOP-8
CM431AGACS* CM431AGBCS* CM431AGECS*
Notes
1
Add suffix
TR
for Tape & Reel.
2
Add suffix
TA
for Tape Ammo.
3
*Note: Add
suffix "G" for Pb Free Product
CM431A
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
2004/08/27 Champion Microelectronic Corporation
Page 4
ABSOLUTE MAXIMUM RATINGS
Cathode to Anode Voltage (V
KA
) (Note 2)
-0.3V to 18V
Continuous Cathode Current (I
K
)
-100mA to 150mA
Reference Input Current (I
REF
)
-50uA to 10mA
Maximum junction temperature range, T
J
150
O
C
Storage temperature range
-65
O
C to 150
O
C
Lead temperature (soldiering, 10 seconds)
260
O
C
Note 1: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.
Currents are positive into, negative out of the specified terminal.
Note 2: Voltage values are with respect to the anode terminal unless otherwise noted.
POWER DISSIPATION TABLE
Package
JA
(
O
C/W )
Derating factor ( mW/
O
C )
T
A
25
O
C
T
A
25
O
C
Power rating(mW)
T
A
=70
O
C
Power rating(mW)
T
A
= 85
O
C
Power rating (mW)
T
A
= 105
O
C
Power rating (mW)
SOP-8 165
6.06
757
485
394
272
TO-92 156
6.41
801
513
417
288
SOT-89 71(note)
14.1
1763
1128
916
635
SOT-23 285
3.5
438
280
228
158
Note :
1. For SOT-89 package, Thermal Resistance-Junction to Tab (
JT
) =
35
O
C/W. T
J
= T
TAB
+ (P
D
x
JT
)
2.
JA
:
Thermal Resistance-Junction to Ambient
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
JA
).
The
JA
numbers are guidelines for the thermal performance of the device/PC-board system.
All of the above assume no ambient airflow.
RECOMMENDED OPERATING CONDITIONS
Min
Max
Units
Operating free air temperature range, T
A
0 105
O
C
Cathode current, I
K
1 100
mA
Cathode voltage, V
KA
0 16 V
CM431A
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
2004/08/27 Champion Microelectronic Corporation
Page 5
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the operating ambient temperatures with T
A
= 25
C.
CM431A
Parameter Symbol Test
Conditions
Min
Typ Max
Units
I
K
= 10mA, V
KA
= V
REF
,0.5%
2.488
2.5
2.512
V
I
K
= 10mA, V
KA
= V
REF
,1.0%
2.475 2.5 2.525 V
Reference Input Voltage
V
REF
I
K
= 10mA, V
KA
= V
REF
,1.5%
2.463 2.5 2.537 V
Reference Drift
I
K
= 10mA, V
KA
= V
REF
, 0
O
C
T
A
70
O
C 4 17
mV
Voltage Ratio, Ref to Cathode
(note 4)
I
K
= 10mA, V
KA
= 2.5V to 18V
-1.4
-2.7
mV/V
I
K
= 10mA,V
KA
= V
REF
2 4
Reference Input Current
I
REF
I
K
= 10mA,V
KA
= V
REF
, 0
O
C
T
A
70
O
C
2.3
A
Minimum Operating Current
I
MIN
V
KA
= V
REF
0.4 1
mA
Off-State Cathode Current
I
OFF
V
KA
= 18V, V
REF
= 0V
0.1
1
A
Dynamic Impedance
|Z
KA
|
V
KA
= V
REF
, I
K
= 1mA to 100mA,
f
1kHz
0.2
0.5
Note 3: These parameters are guaranteed by design
V
REF
Note 4:
V
KA
Ratio of change in reference input voltage to the change in cathode voltage
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