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CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
GENERAL DESCRIPTION
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 VBREF and 36V by using two external resistors. The
B
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 VBREF to 36V
B
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.
Available in SOT-23, SOT-89, TO-92, & SOP-8 Low output noise Typical equivalent full range temperature coefficient of 30ppm/P O
PC
APPLICATIONS
Voltage Reference Precision shunt regulator High current shunt regulator PWM down converter with reference Voltage monitor
PIN CONFIGURATION
TO-92 Front View
CATHODE
SOT-23-3 Top View
3
REF
ANODE
CM431XCM233 Pin 1 Pin 2 Pin 3
1 2
CM431XCM2R3 CATHODE REF ANODE
REF CATHODE ANODE
Suffix "X": Grade "A", "B", "C", or "D"
1
2
3
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.1.4
Champion Microelectronic Corporation
Page 1
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
TYPICAL APPLICATION
V+ RBb
B
BLOCK DIAGRAM
VBO = 5V
B
CATHODE
Note: RBb should provide cathode current 1mA
B
R1 27.5K 0.1% R2 27.5K 0.1%
REF
+ -
VBREF
B
5V Precision Regulator
ANODE
ORDERING INFORMATION
PACKAGE 0.5% SOT-23P1
P
TOLERANCE 0.7% CM431DCM233 CM431DCM2R3 CM431DCM89 CM431DCN CM431DCS CM431GDCM233* CM431GDCM2R3* CM431GDCM89* CM431GDCN* CM431GDCS* 1.0% CM431BCM233 CM431BCM2R3 CM431BCM89 CM431BCN CM431BCS CM431GBCM233* CM431GBCM2R3* CM431GBCM89* CM431GBCN* CM431GBCS* TR=3K TR=3K TR=1K TA=2K T/R Quantity TR=3K TR=3K TR=1K TA=2K
CM431ACM233 CM431ACM2R3
P
SOT-23P1 SOT-89P1
P
CM431ACM89 CM431ACN
TO-92P2
P
SOP-8 SOT-23P
1
P
CM431ACS CM431GACM233* CM431GACM2R3*
P
SOT-23P1 SOT-89P1
P
CM431GACM89* CM431GACN*
TO-92P2
P
SOP-8 Notes
CM431GACS*
1 Add suffix TRfor Tape & Reel. 2 Add suffix TAfor Tape Ammo. 3 *Note: Add suffix "G" for Pb Free Product
2006/10/11
Rev.1.4
Champion Microelectronic Corporation
Page 2
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
ABSOLUTE MAXIMUM RATINGS
Cathode to Anode Voltage (VBKA) (Note 2)
B
-0.3V to 37V -100mA to 150mA -50uA to 10mA
B
Continuous Cathode Current (IBK)
B
Reference Input Current (IBREF)
B
Maximum junction temperature range, TBJ Storage temperature range Lead temperature (soldiering, 10 seconds) Note 1: Note 2: Currents are positive into, negative out of the specified terminal. Voltage values are with respect to the anode terminal unless otherwise noted.
150P O -65P
O
PC
PC
to 150PO
PC
260P
O
PC
Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.
POWER DISSIPATION TABLE
Package (
P
BJA
B
O
PC/W
)
Derating factor ( mW/P TBA25P O
B PC
O
PC
)
TBA25P Power rating(mW)
B PC
O
TBA=70P O Power rating(mW)
B PC
TBA= 85P O Power rating (mW)
B PC
SOP-8 TO-92 SOT-89
165 156 71(note)
6.06 6.41 14.1
757 801 1763
485 513 1128
394 417 916 228
SOT-23 285 3.5 438 280 Note : 1. For SOT-89 package, Thermal Resistance-Junction to Tab ( BJT ) =B 35P O TBJ = TBTAB + (PBD x BJT) 2. BJA: Thermal Resistance-Junction to AmbientB Junction Temperature Calculation: TBJ = TBA + (PBD x BJA). The BJA numbers are guidelines for the thermal performance of the device/PC-board system. All of the above assume no ambient airflow.
B B PC/W. B B B B B B B B B B B
RECOMMENDED OPERATING CONDITIONS
Min Operating free air temperature range, TBA
B
Max 105
Units
O
P PC
0 1 0
Cathode current, IBK
B
100 36
mA V
Cathode voltage, VBKA
B
2006/10/11
Rev.1.4
Champion Microelectronic Corporation
Page 3
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the operating ambient temperatures with TBA = 25C.
B
Parameter
Symbol
B
Test Conditions IBK = 10mA, VBKA = VBREF ,0.5%
B B
CM431 Min 2.482 2.478 2.470
O
PC B
Typ 2.495 2.495 2.495 4 -1.4 2
Max 2.507 2.512 2.520 17 -2.7 4 2.3 1 1 0.5
Units V V V mV mV/V A mA A
Reference Input Voltage Reference Drift Voltage Ratio, Ref to Cathode (note 4) Reference Input Current Minimum Operating Current Off-State Cathode Current Dynamic Impedance
VBREF
B
IBK = 10mA, VBKA = VBREF ,0.7%
B B B
IBK = 10mA, VBKA = VBREF ,1.0%
B B B
IBK = 10mA, VBKA = VBREF, 0P
B B B B B
O
PC
TBA 70P
IBK = 10mA, VBKA = 2.5V to 36V IBREF
B
IBK = 10mA,VBKA = VBREF
B B B B B B
IBK = 10mA,VBKA = VBREF, 0P
B
O
PC
TBA 70P
B
O
PC
IBMIN IBOFF
B
VBKA = VBREF
B B B
0.4
B
VBKA = 36V, VBREF = 0V VBKA = VBREF, IBK = 1mA to 100mA,
B B B
0.1 0.2
|ZBKA |
B
f 1kHz
Note 3: These parameters are guaranteed by design Note 4: VBREF
B
VBKA
B
Ratio of change in reference input voltage to the change in cathode voltage
2006/10/11
Rev.1.4
Champion Microelectronic Corporation
Page 4
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
PARAMETER MEASUREMENT INFORMATION
Input
VBKA
B
Input
VBKA
B
R1
IBREF
B
R2 VBRE
EF
B
(1 + R1/R2) + IBREF x R1
B B B
Figure 1. Test Circuit for VBKA = VBREF
B B
Figure 2. Test Circuit for VBKA > VBREF
Input
VBKA
B
IBOFF
B
Figure 3. Test Circuit for IBOFF
2006/10/11
Rev.1.4
Champion Microelectronic Corporation
Page 5
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
TYPICAL CHARACTERISTICS
Cathode Current vs. Cathode Voltage Cathode Current vs. Cathode Voltage
Ref. Input Voltage vs. Free-Air Temperature
Ref. Input Current vs. Free-Air Temperature
Stability Boundray Conditions
100 90 IKA-Cathode Current (mA) 80 70 60 50 40 30 20 10 0 0.001 0.01 0.1 1 C L -Load Capacitance(uF) 10
2006/10/11
Rev.1.4
Champion Microelectronic Corporation
Page 6
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
APPLICATION INFORMATION
VBBATT
B
R*
VBO
B
VBBATT
B
R1 0.1% VBREF
B
CM431 CM431 Input VBth = 2.5V
B
VBO
B
R2 0.1%
VBon 2V VBoff VBBATT
B B B
GND VBO = (1 + R1/R2) x VBREF
B
Note: R should provide 1mA cathode current to the CM431 of minimum VBBATT Figure 4. Shunt Regulator Figure 5. Single -Supply Comparator With Temperature compensated threshold.
VBBATT
B
VBO
B
VBBATT
B
VBO
B
R1
R1 CM431 R2 C
R2
CM431
VBO = (1 + R1/R2) x VBREF
B
Figure 6. High-Current Shunt Regulator
Figure 7. Crowbar Circuit
2006/10/11
Rev.1.4
Champion Microelectronic Corporation
Page 7
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
APPLICATION INFORMATION (continued)
VBO = 5V/1.5A
B
VBBATT
B
VBBATT
B
LM317 Adjust
IBO = VBREF/RBS
B B B
8.2K
243 0.1% CM431 243 0.1% CM431 RBS 0.1%
B
Figure 8.Precision 5V, 1.5A Regulator
Figure 9. Precision Constant Current Sink
VBBATT
B
IN 78L05 OUT VBO
B
VBBATT
B
RBCL 0.1%
B
IBO
B
Common CM431
R1
R1
R2 CM431
IBOUT = (VBREF/RBCL) + IBKA
B B B
VBO = (1 + R1/R2) x VBREF
B
R1 = VBBATT/((IBO/hBFE) + IBKA)
B B B B
Min VBO = VBREF + 5V
B B
Figure 10. Output Control of a Three-Terminal Fixed Regulator
Figure 11. Precision Current Limiter
2006/10/11
Rev.1.4
Champion Microelectronic Corporation
Page 8
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
3-Pin Plastic TO-92 Package Dimension
INCHES MIN A
B K
MILLIMETERS MAX MIN 4.45 4.32 3.18 TYP 4.57 4.57 3.62 0.38 1.27 3.81 MAX 5.21 5.33 4.19 -
TYP
0.175 0.180 0.205 0.170 0.180 0.210
B
A G F
C 0.125 0.142 0.165 F G 0.015 0.050 0.150 -
C
J K
N
0.500 0.580 5 5
12.70 14.73 5 5
M N
3-Pin Plastic TO-92 Carrier Dimensions
P1 P
INCHES MIN C 0.079
Ho
MILLIMETERS MAX MIN 2.00 12.2 12.4 3.8 5.85 4.2 17.0 15.5 5.7 8.5 TYP 12.7 12.7 4.0 6.35 5.0 18.0 16.0 6.0 9.0 MAX 13.2 13.0 4.2 6.85 5.6 19.0 16.5 6.3 9.5
C
TYP -
P
0.480 0.500 0.520
W1
Wo
Po 0.488 0.500 0.512 Do 0.150 0.157 0.165
W
P1 0.230 0.250 0.256 Fo 0.165 0.197 0.220
F1 Do Po Fo
W 0.669 0.709 0.748 Ho 0.610 0.630 0.649 Wo 0.224 0.236 0.248 W1 0.335 0.354 0.374
Note: For TO-92, 2,500 units per ammo
2006/10/11
Rev.1.4
Champion Microelectronic Corporation
Page 9
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
Surface Mount SOT-23
INCHES MIN TYP MAX MILLIMETERS MIN 1.00 0.00 0.70 0.35 0.10 2.70 1.40 TYP 1.10 0.80 0.40 0.15 2.90 1.60 1.90 TYP. 2.60 0.37 1 2.80 5 3.00 9 MAX 1.30 0.10 0.90 0.50 0.25 3.10 1.80
D
C L H
A
0.039 0.043 0.051 0.004
A1 0.000
A2 0.028 0.032 0.035 b 0.014 0.016 0.020
E
C 0.004 0.005 0.010 D 0.106 0.114 0.122
e
M
E e 0.055 0.063 0.071 0.075 TYP.
A2
A A1 b
H 0.102 0.110 0.118 L M 0.015 1 5 9
Surface Mount SOT-23 Carrier Dimensions
A
B M E
MILLIMETERS A B
F
4.0 0.1 2.0 0.05 4.0 0.1 2.5 0.05 1.75 0.1 6.0 0.2
M N
1.5 0.1 1.1 0.1
D
C D
N C
E F
DIRECTION OF FEED
2006/10/11
Rev.1.4
Champion Microelectronic Corporation
Page 10
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
SOT-89 Package Dimension
D D1
1.0
E
H
L
5
C e e1
A
8
L b b1 C D D1 H E e1
b
b1
b
e
8-Pin Plastic S.O.I.C.
PIN 1 ID
2006/10/11
Rev.1.4
Champion Microelectronic Corporation
Page 11
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
IMPORTANT NOTICE
Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. CMC integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of CMC products in such applications is understood to be fully at the risk of the customer. In order to minimize risks associated with the customer's applications, the customer should provide adequate design and operating safeguards.
HsinChu Headquarter
5F, No. 11, Park Avenue II, Science-Based Industrial Park, HsinChu City, Taiwan T E L : +886-3-5679979 F A X : +886-3-5679909
Sales & Marketing
7F-6, No.32, Sec. 1, Chenggong Rd., Nangang District, Taipei City 115, TaiwanT , R.O.C. T E L : +886-2-2788 0558 F A X : +886-2-2788 2985
T T T
2006/10/11
Rev.1.4
Champion Microelectronic Corporation
Page 12

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