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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 VREF 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
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 VREF to 36V Available in SOT-23, SOT-89, TO-92, & SOP-8 Low output noise Typical equivalent full range temperature coefficient of 30ppm/ C
O
APPLICATIONS
PIN CONFIGURATION
TO-92 Front View SOT-23-3 Top View
3
CATHODE
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
CATHO D E REF
CATHODE
ANO DE
REF
ANODE
2 3 4
NC
NC
1
2
3
1
2
3
2003/03/24 Preliminary Rev.1.1
Champion Microelectronic Corporation
Page 1
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
TYPICAL APPLICATION
V+ Rb R1 27.5K 0.1% R2 27.5K 0.1% VREF ANODE 5V Precision Regulator VO = 5V CATHODE
BLOCK DIAGRAM
REF
Note: Rb should provide cathode current 1mA
+ -
ORDERING INFORMATION
PACKAGE 0.5% SOT-23 SOT-23 SOT-89 TO-92
1
TOLERANCE 0.7% CM431DCM233 CM431DCM2R3 CM431DCM89 CM431DCN CM431DCS 1.0% CM431BCM233 CM431BCM2R3 CM431BCM89 CM431BCN CM431BCS T/R Quantity TR=3K TR=3K TR=1K TA=2K
CM431ACM233 CM431ACM2R3 CM431ACM89 CM431ACN CM431ACS
1
1
2
SOP-8 Notes
1 Add suffix TRfor Tape & Reel. 2 Add suffix TAfor Tape Ammo.
2003/03/24 Preliminary Rev.1.1
Champion Microelectronic Corporation
Page 2
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
ABSOLUTE MAXIMUM RATINGS
Cathode to Anode Voltage (VKA) (Note 2) Continuous Cathode Current (IK) Reference Input Current (IREF) Maximum junction temperature range, TJ 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. -0.3V to 37V -100mA to 150mA -50uA to 10mA 150 C -65 C to 150 C 260 OC
O O O
Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.
POWER DISSIPATION TABLE
Package SOP-8 TO-92 SOT-89 JA ( C/W )
O
Derating factor ( mW/ C ) O TA25 C 6.06 6.41 14.1
O
TA25 C Power rating(mW) 757 801 1763
O
TA=70 C Power rating(mW) 485 513 1128
O
TA= 85 C Power rating (mW) 394 417 916 228
O
165 156 71(note)
SOT-23 285 3.5 438 280 Note : O 1. For SOT-89 package, Thermal Resistance-Junction to Tab ( JT ) = 35 C/W. TJ = TTAB + (PD x JT) 2. JA: Thermal Resistance-Junction to Ambient Junction Temperature Calculation: TJ = TA + (PD 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 Operating free air temperature range, TA Cathode current, IK Cathode voltage, VKA 0 1 0 Max 105 100 36 Units
O
C
mA V
2003/03/24 Preliminary Rev.1.1
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 TA = 25C.
Parameter
Symbol
Test Conditions IK = 10mA, VKA = VREF ,0.5%
CM431 Min 2.482 2.478 2.470
O
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
VREF
IK = 10mA, VKA = VREF ,0.7% IK = 10mA, VKA = VREF ,1.0% IK = 10mA, VKA = VREF, 0 C TA 70 C
O
IK = 10mA, VKA = 2.5V to 36V IREF IMIN IOFF |ZKA | IK = 10mA,VKA = VREF IK = 10mA,VKA = VREF, 0 C TA 70 C
O O
VKA = VREF VKA = 36V, VREF = 0V VKA = VREF, IK = 1mA to 100mA, f 1kHz
0.4 0.1 0.2
Note 3: These parameters are guaranteed by design Note 4: VREF VKA Ratio of change in reference input voltage to the change in cathode voltage
2003/03/24 Preliminary Rev.1.1
Champion Microelectronic Corporation
Page 4
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
PARAMETER MEASUREMENT INFORMATION
Input
VKA
Input
VKA
R1
IREF
R2 VRE
(1 + R1/R2) + IREF x R1
Figure 1. Test Circuit for VKA = VREF Figure 2. Test Circuit for VKA > VREF
Input
VKA IOFF
Figure 3. Test Circuit for IOFF
2003/03/24 Preliminary Rev.1.1
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
2003/03/24 Preliminary Rev.1.1
Champion Microelectronic Corporation
Page 6
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
APPLICATION INFORMATION
VBATT R*
VO R1 0.1% VREF R2 0.1% Input
VBATT
CM431 CM431 VO Von 2V Voff VBATT Vth = 2.5V GND
VO = (1 + R1/R2) x VREF
Note: R should provide 1mA cathode current to the CM431 of minimum VBATT Figure 4. Shunt Regulator Figure 5. Single -Supply Comparator With Temperature compensated threshold.
VBATT
VO
VBATT R1 CM431 R2 C
VO
R1
R2
CM431
VO = (1 + R1/R2) x VREF
Figure 6. High-Current Shunt Regulator Figure 7. Crowbar Circuit
2003/03/24 Preliminary Rev.1.1
Champion Microelectronic Corporation
Page 7
CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
APPLICATION INFORMATION (continued)
VO = 5V/1.5A VBATT
VBATT 8.2K
LM317 Adjust
IO = VREF/RS
243 0.1% CM431 243 0.1% CM431 RS 0.1%
Figure 8.Precision 5V, 1.5A Regulator
Figure 9. Precision Constant Current Sink
VBATT
IN 78L05 OUT VO VBATT
RCL 0.1%
IO
Common CM431
R1
R1
R2 CM431
IOUT = (VREF/RCL) + IKA VO = (1 + R1/R2) x VREF Min VO = VREF + 5V
Figure 11. Precision Current Limiter
R1 = VBATT/((IO/hFE) + IKA)
Figure 10. Output Control of a Three-Terminal Fixed Regulator
2003/03/24 Preliminary Rev.1.1
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 Po 0.488 0.500 0.512 Do 0.150 0.157 0.165
W
W1
Wo
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
2003/03/24 Preliminary Rev.1.1
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
2003/03/24 Preliminary Rev.1.1
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
2003/03/24 Preliminary Rev.1.1
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 FA X : +886-3-5679909
Sales & Marketing
11F, No. 306-3, Sec. 1, Ta Tung Rd., Hsichih, Taipei Hsien 221 Taiwan, R.O.C. T E L : +886-2-86921591 F A X : +886-2-86921596
2003/03/24 Preliminary Rev.1.1
Champion Microelectronic Corporation
Page 12

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