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AMC DOC. #: AMC431_C November 2002
ADD MICROTECH CORP.
DESCRIPTION
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AMC431
PRECISION ADJUSTABLE SHUNT VOLTAGE REFERENCE
FEATURES
The AMC431 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 AMC431 offers low output impedance for improved load regulation with a typical output impedance of 200m. Because of the active output circuitry, the AMC431can 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.
APPLICATIONS
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Initial voltage reference accuracy of 0.5%, 1.0%, and 1.5% Sink current capability from 1mA to 100mA Typical output dynamic impedance less than 200m; Adjustable output voltage from VREF to 36V Available in 3L-TO92 and surface mount SOT89, SOT23 and 8 pin S.O.I.C. packages Low output noise Typical equivalent full range temperature coefficient of 30ppm/C Pin assignment identical to earlier TL431 series.
PACKAGE PIN OUT
Voltage Reference Precision shunt regulator High current shunt regulator PWM down converter with reference Voltage monitor
CATHODE ANODE VREF
CATHODE ANODE ANODE NC
VREF ANODE ANODE NC
3-Pin Plastic TO-92 (Top View)
VREF ANODE
8-Pin Plastic S.O.I.C. Surface Mount (Top View)
CATHODE ANODE CATHODE VREF
CATHODE ANODE VREF
3-Pin Plastic SOT-89 Surface Mount (Top View)
(Note 1) 3-Pin Plastic SOT-23 Surface Mount (Top View)
(Note 2) 3-Pin Plastic SOT-23 Surface Mount (Top View)
ORDER INFORMATION TA (C)
Initial Tolerance
DM
SOIC 8-pin --
LP
TO-92 3-pin
PK
SOT-89 3-pin --
DB
SOT-23 3-pin --
DB
SOT-23 3-pin --
1.5%
AMC431CLP AMC431LP
0 to 70
1%
AMC431DM
AMC431PK
AMC431DB
AMC431RDB
0.5% AMC431BPK AMC431BDB AMC431BRDB -AMC431BLP Note: 1. For AMC431DB and AMC431BDB. 2. For AMC431RDB and AMC431BRDB. 3. For surface-mount and TO-92 packages in Tape & Reel, add suffix "T" (e.g., AMC431LPT, AMC431DBT). 4. For TO-92 in Tape & Box (without reel), add suffix "TB" (e.g., AMC431LPTB). 5. DB package is only available in Tape & Reel.
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AMC DOC. #: AMC431_C November 2002
AMC431
PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS
BLOCK DIAGRAM
TYPICAL APPLICATION VO = 5V
V+ Rb
CATHODE
Note: Rb should provide cathode current 1mA
R1 27.5K 0.1% R2 27.5K 0.1%
REF
+ VREF ANODE
5V Precision Regulator
ABSOLUTE MAXIMUM RATINGS (Note 1) -0.3V to 37V Cathode to Anode Voltage (VKA) (Note 2) -100mA to 150mA Continuous Cathode Current (IK) -50uA to 10mA Reference Input Current (IREF) 150C Maximum junction temperature range, TJ Storage temperature range -65OC to 150OC Lead temperature (soldiering, 10 seconds) 260C 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 Derating factor DF(mW/C) TA 25C (C /W ) DM LP PK 165 156 71(note) 6.06 6.41 14.1
TA 25C Power rating(mW) 757 801 1763
TA=70C Power rating(mW) 485 513 1128
TA= 85C Power rating (mW) 394 417 916 228
DB 285 3.5 438 280 Note : 1. For PK package, Thermal Resistance-Junction to Tab ( JT ) = 35C /W. TJ = TTAB + (PD x JT). PD: Power Dissipation. 2. JA: Thermal Resistance-Junction to Ambient, DF = 1/JA 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.
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AMC DOC. #: AMC431_C November 2002
AMC431
PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS
RECOMMENDED OPERATING CONDITIONS Operating free air temperature range, TA Cathode current, IK Cathode voltage, VKA
Min 0 1 0
Max 70 100 36
Units C mA V
ELECTRICAL CHARACTERISTICS Unless otherwise specified, these specifications apply over the operating ambient temperatures with TA = 25C. Parameter Reference Input Voltage Reference Input Voltage Reference Input Voltage Reference Drift Voltage Ratio, Ref to Cathode (note 4) Reference Input Current Symbol VREF VREF VREF Test Conditions
AMC431
Min Typ Max
Units
IK = 10mA, VKA = VREF, note 1 2.475 2.500 2.525 V IK = 10mA, VKA = VREF, note 2 2.462 2.500 2.538 V IK = 10mA, VKA = VREF, note 3 2.487 2.500 2.513 V 4 17 mV IK = 10mA, VKA = VREF, 0C TA 70C IK = 10mA, VKA = 2.5V to 36V -1.4 -2.7 mV/V 2 0.4 0.1 0.2 2.3 4 1 1 0.5 A mA A
IK = 10mA,VKA = VREF IK = 10mA,VKA = VREF, 0C TA 70C Minimum Operating Current IMIN VKA = VREF VKA = 36V, VREF = 0V Off-State Cathode Current IOFF VKA = VREF, IK = 1mA to 100mA, Dynamic Impedance |ZKA | f 1kHz Note 1: For AMC431 only. The output accuracy is 1.0%. Note 2: For AMC431C only. The output accuracy is 1.5%. Note 3: For AMC431B only. The output accuracy is 0.5%. VREF Note 4: Ratio of change in reference input voltage to the change in cathode voltage VKA IREF
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AMC DOC. #: AMC431_C November 2002
AMC431
PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS
PARAMETER MEASUREMENT INFORMATION
Input
VKA
Input
VKA
R1
IREF
R2 VRE
Figure 1. Test Circuit for VKA = VREF
Figure 2. Test Circuit for VKA > VREF
Input
VKA IOFF
Figure 3. Test Circuit for IOFF
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AMC DOC. #: AMC431_C November 2002
AMC431
PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS
CHARACTERIZATION CURVES
CATHODE CURRENT vs CATHODE VOLTAGE 150 125 100 IKA - Cathode Current (mA) IKA - Cathode Current (A) 75 50 25 0 -25 -50 -75 -100 -2 -1 0 1 VKA - Cathode Voltage (V) 2 3 -200 -1 VKA = VREF TA = 25C 600 800
CATHODE CURRENT vs CATHODE VOLTAGE
VKA = VREF TA = 25C Imin 400
200
0
0 1 VKA - Cathode Voltage (V)
2
3
REFERENCE INPUT VOLTAGE vs FREE-AIR TEMPERATURE VREF - Reference Input Voltage (mV) 2600 IREF - Reference Input Current (A) 2580 2560 2540 2520 IKA = 100mA 2500 2480 2460 2440 2420 2400 -75 -50 -25 0 25 50 75 100 125 0 TA - Free-Air Temperature - C -75 IKA = 10mA VKA = VREF 5
REFERENCE INPUT CURRENT vs FREE-AIR TEMPERATURE R1 = 10 k R2 = IKA = 10mA
4
3
2
1
-50 -25 0 25 50 75 TA - Free-Air Temperature - C
100
125
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AMC DOC. #: AMC431_C November 2002
AMC431
PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS
APPLICATION INFORMATION
VBATT
R*
VO R1 0.1% VREF R2 0.1% Input
VBATT
AMC431 AMC431 VO Von 2V Voff VBATT Vth = 2.5V GND
VO = (1 + R1/R2) x VREF
Note: R should provide 1mA cathode current to the AMC431 of minimum VBATT Figure 4. Shunt Regulator Figure 5. Single -Supply Comparator With Temperature compensated threshold.
VBATT
VO
VBATT R1 AMC431 R2 C
VO
R1
R2
AMC431
VO = (1 + R1/R2) x VREF
Figure 6. High-Current Shunt Regulator Figure 7. Crowbar Circuit
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AMC DOC. #: AMC431_C November 2002
AMC431
PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS
APPLICATION INFORMATION (continued)
VBATT 8.2K
AMC317 Adjust
VO = 5V/1.5A
VBATT
IO = VREF/RS
243 0.1% AMC431 243 0.1% AMC431 RS 0.1%
Figure 8.Precision 5V, 1.5A Regulator
Figure 9. Precision Constant Current Sink
VBATT
IN AMC78L05 OUT VO VBATT
RCL 0.1%
IO
Common AMC431
R1
R1
R2 AMC431
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)
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AMC DOC. #: AMC431_C November 2002
AMC431
PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS
3-Pin Plastic TO-92
INCHES
M
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 -
MIN
A G F
TYP
A B
0.175 0.180 0.205 0.170 0.180 0.210
C 0.125 0.142 0.165 F
C
-
0.015 0.050 0.150
-
G J
N
K M N
0.500 0.580 5 5
12.70 14.73 5 5
Note: For TO-92 in taping, refer to TO-92 package and taping dimension data for lead dimensions.
3-Pin Plastic TO-92 Package and Taping Dimensions
P1 P
INCHES MIN
C
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
TYP -
C 0.079 P
0.480 0.500 0.520
Ho Wo
Po 0.488 0.500 0.512 Do 0.150 0.157 0.165 P1 0.230 0.250 0.256
W
W1
Fo 0.165 0.197 0.220 W 0.669 0.709 0.748 Ho 0.610 0.630 0.649
F1 Do Po Fo
Wo 0.224 0.236 0.248 W1 0.335 0.354 0.374
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AMC DOC. #: AMC431_C November 2002
AMC431
PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS
8-Pin Plastic S.O.I.C.
INCHES MIN A B B F P 0.183 0.144 TYP MAX 0.202 0.163 0.074 0.020 0.035 MILLIMETERS MIN 4.65 3.66 1.73 0.25 0.38 TYP 1.27 BSC 0.19 0.13 4.80 5.79 0.25 0.25 5.21 8 6.20 MAX 5.13 4.14 1.88 0.51 0.89
A
C 0.068 D 0.010 F 0.015
D
G L C
G J K M J L M P
0.050 BSC 0.007 0.005 0.189 0.228 0.010 0.010 0.205 8 0.244
SEATING PLAN seating plane
K
3-Pin Surface Mount SOT-89
INCHES MILLIMETERS MAX 0.181 0.102 0.063 0.017 0.090 0.019 MIN 4.39 2.28 1.39 0.38 2.13 0.33 TYP 1.49 BSC 2.99 BSC 0.45 3.94 1.70 0 0.89 0.55 4.24 1.82 8 1.19 MAX 4.59 2.59 1.60 0.43 2.28 0.48
A L
C D
MIN A B 0.173 0.090
TYP -
C 0.055 D 0.015
K N F J G H
B
E
E F
0.084 0.016
M
G H J K L M
0.059 BSC 0.118 BSC 0.018 0.155 0.067 0 0.022 0.167 0.072 8 0.047
N 0.035
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AMC DOC. #: AMC431_C November 2002
AMC431
PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS
Surface Mount SOT-23
D C
MIN INCHES 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
L H
A
0.039 0.043 0.051 0.004
A1 0.000
E
A2 0.028 0.032 0.035 b 0.014 0.016 0.020
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.
H 0.102 0.110 0.118
A2
A A1 b
L M
0.015 1
5
9
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AMC DOC. #: AMC431_C November 2002
AMC431
PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS
IMPORTANT NOTICE
ADD Microtech (ADDM) 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. ADDM 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 ADDM 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. ADDM assumes to no liability to customer product design or application support. ADDM warrants the performance of its products to the specifications applicable at the time of sale.
U.S.
ADD Microtech Inc. 492 Altamont Drive Milpitas, CA 95035 T E L : (408) 9410420 FA X : (408) 9410864
Asia Pacific region
ADD Microtech Corp 3F, 132, Sec. 4, Chung Hsiao E. Rd., Taipei, Taiwan T E L : 2-27760166 FA X : 2-27764208
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