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CM431A
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
GENERAL DESCRIPTION
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 VREF 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
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 18V Available in SOT-23, SOT-89, TO-92, & SOP-8 Low output noise Typical equivalent full range temperature coefficient of 30ppm/ OC
APPLICATIONS
PIN CONFIGURATION
TO-92 Front View
CATHODE
SOT-23-3 Top View
3
REF
ANODE
CM431AXCM233 CM431AXCM2R3 Pin 1 Pin 2 Pin 3
1 2
REF CATHODE ANODE
CATHODE REF ANODE
Suffix "X": Grade "A", "B", "C", "D", or "E"
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
2004/08/27
Champion Microelectronic Corporation
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CM431A
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
+ -
2004/08/27
Champion Microelectronic Corporation
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CM431A
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
ORDERING INFORMATION
PACKAGE 0.5% SOT-23-31 SOT-23-31 SOT-23-51 SOT-891 TO-922 SOP-8 SOT-23-31 SOT-23-31 SOT-23-51 SOT-891 TO-922 SOP-8 Notes 1 Add suffix TRfor Tape & Reel. 2 Add suffix TAfor Tape Ammo. 3 CM431AACM233 CM431AACM2R3 CM431AACM235 CM431AACM89 CM431AACN CM431AACS CM431AGACM233* CM431AGACM2R3* CM431AGACM235* CM431AGACM89* CM431AGACN* CM431AGACS* 1.0% CM431ABCM233 CM431ABCM2R3 CM431ABCM235 CM431ABCM89 CM431ABCN CM431ABCS CM431AGBCM233* CM431AGBCM2R3* CM431AGBCM235* CM431AGBCM89* CM431AGBCN* CM431AGBCS* TOLERANCE 1.5% CM431AECM233 CM431AECM2R3 CM431AECM235 CM431AECM89 CM431AECN CM431AECS CM431AGECM233* CM431AGECM2R3* CM431AGECM235* CM431AGECM89* CM431AGECN* CM431AGECS* TR=3K TR=3K TR=3K TR=1K TA=2K T/R Quantity TR=3K TR=3K TR=3K TR=1K TA=2K
*Note: Add suffix "G" for Pb Free Product
2004/08/27
Champion Microelectronic Corporation
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CM431A
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 18V -100mA to 150mA -50uA to 10mA 150 OC -65OC to 150OC 260 OC
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/OC ) O TA25 C 6.06 6.41 14.1
TA25 OC Power rating(mW) 757 801 1763
TA=70 OC Power rating(mW) 485 513 1128
TA= 85 OC Power rating (mW) 394 417 916
TA= 105 OC Power rating (mW) 272 288 635 158
165 156 71(note)
SOT-23 285 3.5 438 280 228 Note : 1. For SOT-89 package, Thermal Resistance-Junction to Tab ( JT ) = 35 OC/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 16 Units
O
C
mA V
2004/08/27
Champion Microelectronic Corporation
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CM431A
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%
CM431A Min 2.488 2.475 2.463 Typ 2.5 2.5 2.5 4 -1.4 2 0.4 0.1 0.2 Max 2.512 2.525 2.537 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 ,1.0% IK = 10mA, VKA = VREF ,1.5% IK = 10mA, VKA = VREF, 0OC TA 70 OC IK = 10mA, VKA = 2.5V to 18V
IREF IMIN IOFF |ZKA |
IK = 10mA,VKA = VREF IK = 10mA,VKA = VREF, 0OC TA 70 OC VKA = VREF VKA = 18V, VREF = 0V VKA = VREF, IK = 1mA to 100mA, f 1kHz
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
2004/08/27
Champion Microelectronic Corporation
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CM431A
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
2004/08/27
Champion Microelectronic Corporation
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CM431A
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
2004/08/27
Champion Microelectronic Corporation
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CM431A
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
APPLICATION INFORMATION
VBATT R*
VO R1 0.1% VREF R2 0.1% Input
VBATT
CM431A CM431A VO Von 2V Voff VBATT Vth = 2.5V GND
VO = (1 + R1/R2) x VREF
Note: R should provide 1mA cathode current to the CM431A of minimum VBATT Figure 4. Shunt Regulator Figure 5. Single -Supply Comparator With Temperature compensated threshold.
VBATT
VO
VBATT R1 CM431A R2 C
VO
R1
R2
CM431A
VO = (1 + R1/R2) x VREF
Figure 6. High-Current Shunt Regulator Figure 7. Crowbar Circuit
2004/08/27
Champion Microelectronic Corporation
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CM431A
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
APPLICATION INFORMATION (continued)
VO = 5V/1.5A VBATT
VBATT 8.2K
LM317 Adjust
IO = VREF/RS
243 0.1% CM431A 243 0.1% CM431A 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 CM431A
R1
R1
R2 CM431A
IOUT = (VREF/RCL) + IKA VO = (1 + R1/R2) x VREF Min VO = VREF + 5V
Figure 10. Output Control of a Three-Terminal Fixed Regulator Figure 11. Precision Current Limiter
R1 = VBATT/((IO/hFE) + IKA)
2004/08/27
Champion Microelectronic Corporation
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CM431A
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
PACKAGE DIMENSION
TO-92
A A1 b D D1
A
E L e
1
A1 E L
b
D
e
SOT-23-3
D
3
b1 c1
With Plating
A
c
A1 A2
E1
b
Base Metal
Section B-B
E
b b1 c c1 D E
1
e e1
2
E1
b
L L1 e e1
1
1 2
A2
A
2
A1
See Section B-B
2004/08/27
Champion Microelectronic Corporation
L L1
1
D1
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CM431A
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
PACKAGE DIMENSION (CONTINUED)
SOT-23-5
D
5 4
b1 c1
With Plating
A
c
A1 A2
E1
b
Base Metal
Section B-B
E
b b1 c c1 D E
1
2
3
e e1
E1
b
L L1 e e1
1
1 2
A2
A
2
A1
See Section B-B
SOT-89
D D1
1.0
E
H
L L1
L
5
C e e1
A
8
L b b1 C D D1 H E e1
b
b1
b
e
2004/08/27
Champion Microelectronic Corporation
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CM431A
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
PACKAGE DIMENSION (CONTINUED)
8-PIN SOP (S08)
PIN 1 ID
2004/08/27
Champion Microelectronic Corporation
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CM431A
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
NUMBERING SCHEME
Ordering Number: CM431AXYZ (note1) Ordering Number: CM431AGXYZ (note2)
note1: X : Suffix for Reference Voltage Tolerance (note 3) Y : Suffix for Temperature Range (note 4) Z : Suffix for Package Type (note 5) note2: G : Suffix for Pb Free Product X : Suffix for Reference Voltage Tolerance (note 3) Y : Suffix for Temperature Range (note 4) Z : Suffix for Package Type (note 5) note 3: see the Reference Voltage Tolerance Suffix Table note 4: Y= C: 0~+105 note 5: Z is single alphabet with or without digits M233 : SOT-23-3 (TR only) M2R3: SOT-23-3 (TR only) but pin assignment is different with M233 M235 : SOT-23-5 (TR only) M89:SOT-89(TR only) N:TO-92(TA only) S:SOP-8(TR only)
Reference Voltage Tolerance Suffix Table
Tolerance 0.5% 1% 1.5%
Suffix A B E
2004/08/27
Champion Microelectronic Corporation
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CM431A
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
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
2004/08/27
Champion Microelectronic Corporation
Page 14

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