CM431
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
2003/03/24
Preliminary
Rev.1.1
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 36V
!
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 CM431 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 36V by using two external resistors. The
CM431 offers low output impedance for improved load regulation
with a typical output impedance of 200m
. Because of the
active output circuitry, the CM431 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
AN
O
D
E
CA
TH
O
D
E
SOT-23-3
Top View
1
3
2
SOT-23-5
Top View
1
5
3
NC
A
N
O
D
E
CA
THO
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
CM431XCM233
CM431XCM2R3
Pin 1
REF
CATHODE
Pin 2
CATHODE
REF
Pin 3
ANODE
ANODE
Suffix "X": Grade "A", "B", "C", or "D"
CM431
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
2003/03/24
Preliminary
Rev.1.1
Champion Microelectronic Corporation
Page 2
TYPICAL APPLICATION
BLOCK DIAGRAM
5V Precision Regulator
+
-
ORDERING INFORMATION
PACKAGE TOLERANCE
0.5%
0.7%
1.0%
T/R
Quantity
SOT-23
1
CM431ACM233
CM431DCM233
CM431BCM233 TR=3K
SOT-23
1
CM431ACM2R3
CM431DCM2R3
CM431BCM2R3 TR=3K
SOT-89
1
CM431ACM89
CM431DCM89
CM431BCM89 TR=1K
TO-92
2
CM431ACN
CM431DCN
CM431BCN TA=2K
SOP-8 CM431ACS
CM431DCS
CM431BCS
Notes
1
Add suffix
TR
for Tape & Reel.
2
Add suffix
TA
for Tape Ammo.
CATHODE
ANODE
REF
V
REF
R2
27.5K
0.1%
R1
27.5K
0.1%
R
b
V+
V
O
= 5V
Note: R
b
should
provide cathode
current
1mA
CM431
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
2003/03/24
Preliminary
Rev.1.1
Champion Microelectronic Corporation
Page 3
ABSOLUTE MAXIMUM RATINGS
Cathode to Anode Voltage (V
KA
) (Note 2)
-0.3V to 37V
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)
SOP-8
165 6.06
757 485 394
TO-92
156 6.41
801 513 417
SOT-89 71(note)
14.1
1763
1128
916
SOT-23
285 3.5
438 280 228
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 36 V
CM431
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
2003/03/24
Preliminary
Rev.1.1
Champion Microelectronic Corporation
Page 4
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the operating ambient temperatures with T
A
= 25
C.
CM431
Parameter Symbol Test
Conditions
Min Typ Max
Units
I
K
= 10mA, V
KA
= V
REF
,0.5%
2.482 2.495 2.507 V
I
K
= 10mA, V
KA
= V
REF
,0.7%
2.478 2.495 2.512 V
Reference Input Voltage
V
REF
I
K
= 10mA, V
KA
= V
REF
,1.0%
2.470 2.495 2.520 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 36V
-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
= 36V, 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
CM431
L
OW
V
OLTAGE
A
DJUSTABLE
S
HUNT
R
EGULATOR
2003/03/24
Preliminary
Rev.1.1
Champion Microelectronic Corporation
Page 5
PARAMETER MEASUREMENT INFORMATION
Figure 1. Test Circuit for V
KA
= V
REF
Figure 2. Test Circuit for V
KA
>
V
REF
Figure 3. Test Circuit for I
OFF
(1 + R1/R2) + I
REF
x R1
Input V
KA
V
RE
Input V
KA
I
OFF
Input V
KA
I
REF
R1
R2
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