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AMC431
www.addmtek.com DESCRIPTION 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.
PRECISION ADJUSTABLE SHUNT VOLTAGE REFERENCE
FEATURES 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. Low output noise Typical equivalent full range temperature coefficient of 30ppm/C Pin assignment identical to earlier TL431 series. PACKAGE PIN OUT
CATHODE ANODE ANODE VREF VREF CATHODE
APPLICATIONS Voltage Reference Precision shunt regulator High current shunt regulator PWM down converter with reference Voltage monitor
3-Pin Plastic TO-92 (Top View)
CATHODE ANODE VREF
3-Pin Plastic SOT-23 Surface Mount (Top View) (Note 1)
VREF ANODE CATHODE
3-Pin Plastic SOT-89 Surface Mount (Top View)
3-Pin Plastic SOT-23 Surface Mount (Note 2) (Top View)
Initial TA (C) Tolerance
LP
TO-92 3-pin
ORDER INFORMATION SOT-89 SOT-23 PK DB 3-pin 3-pin
-AMC431PK AMC431PKF(Lead Free) AMC431BPK --AMC431DB AMC431DBF(Lead Free) AMC431BDB ---
DB
SOT-23 3-pin
0 to 70
AMC431BLPF(Lead Free) AMC431BPKF(Lead Free) AMC431BDBF(Lead Free) AMC431BRDBF(Lead Free) Note: 1. For AMC431RDB and AMC431BRDB. 2. For AMC431DB and AMC431BDB. 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. 6. The letter "F" is marked for Lead Free process. Copyright (c) 2006 ADDtek Corp. 1 DD021_G -JUNE 2006
1.5% 1.5% 1% 1% 0.5% 0.5%
AMC431CLP AMC431LP AMC431LPF(Lead Free) AMC431BLP
AMC431CLPF(Lead Free) --
AMC431RDB AMC431RDBF(Lead Free) AMC431BRDB
AMC431
TYPICAL APPLICATION VO = 5V CATHODE V+ Rb R1 27.5K 0.1% REF BLOCK DIAGRAM
+ VREF ANODE
Note: Rb should provide cathode current 1mA
R2 27.5K 0.1% 5V Precision 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:
(Note 1) -0.3V to 37V -100mA to 150mA -50uA to 10mA 150C -65OC to 150OC 260C
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. Voltage values are with respect to the anode terminal unless otherwise noted.
Package LP LPF PK PKF DB DBF
JA (C /W ) 156 156 71(note) 71(note) 285 285
POWER DISSIPATION TABLE TA=70C Derating factor TA 25C Power rating(mW) Power rating(mW) DF(mW/C) TA 25C 6.41 801 513 6.41 14.1 14.1 3.5 3.5 801 1763 1763 438 438 513 1128 1128 280 280
TA= 85C Power rating (mW) 417 417 916 916 228 228
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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AMC431
RECOMMENDED OPERATING CONDITIONS Parameter Operating free air temperature range, TA Cathode current, IK Cathode voltage, VKA 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 Minimum Operating Current Off-State Cathode Current Dynamic Impedance
Note 1: Note 2: Note 3: Note 4:
Min 0 1 0
Max 70 100 36
Units C mA V
Symbol VREF VREF VREF
IREF IMIN IOFF |ZKA |
Min Typ Max 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 mV/ IK = 10mA, VKA = 2.5V to 36V -1.4 -2.7 V IK = 10mA,VKA = VREF 2.3 A 2 4 IK = 10mA,VKA = VREF, 0C TA 70C VKA = VREF 0.4 1 mA VKA = 36V, VREF = 0V 0.1 1 A VKA = VREF, IK = 1mA to 100mA, 0.2 0.5 f 1kHz
Test Conditions
AMC431
Units
For AMC431 only. The output accuracy is 1.0%. For AMC431C only. The output accuracy is 1.5%. For AMC431B only. The output accuracy is 0.5%. VREF VKA Ratio of change in reference input voltage to the change in cathode voltage
Copyright (c) 2006 ADDtek Corp.
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AMC431
PARAMETER MEASUREMENT INFORMATION
Input
VKA
Input
VKA
R1
IREF
VRE
R2
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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AMC431
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 0 1 VKA - Cathode Voltage (V) -1 2 3 -200 -1 0 1 VKA - Cathode Voltage (V) 2 3 VKA = VREF TA = 25C 600 Imin 400 800 VKA = VREF TA = 25C CATHODE CURRENT vs CATHODE VOLTAGE
200
0
REFERENCE INPUT VOLTAGE vs FREE-AIR EMPERATURE 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 IKA = 10mA VKA = VREF
REFERENCE INPUT CURRENT vs FREE-AIR TEMPERATURE 5 R1 = 10 k R2 = IKA = 10mA
4
3
2
1
0 TA - Free-Air Temperature - C -75 -50 -25 0 25 50 75 TA - Free-Air Temperature - C 100 125
Copyright (c) 2006 ADDtek Corp.
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AMC431
APPLICATION INFORMATION VBATT R* VO R1 0.1% VREF R2 0.1% Input Vth = 2.5V GND VO = (1 + R1/R2) x VREF
Note: R should provide 1mA cathode current to the AMC431 of minimum VBATT
VBATT
AMC431 AMC431 VO Von 2V Voff 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
Copyright (c) 2006 ADDtek Corp.
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AMC431
APPLICATION INFORMATION (continued) VO = 5V/1.5A VBATT IO = VREF/RS
VBATT 8.2K
AMC317 Adjust
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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AMC431
PACKAGE
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 Note: For TO-92 in taping, refer to TO-92 package and taping dimension data for lead dimensions.
0.500 0.580 5 5
12.70 14.73 5 5
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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AMC431
3-Pin Surface Mount SOT-89
INCHES MIN TYP MAX 0.181 0.102 0.063 0.017 0.090 0.019 MILLIMETERS 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
A B
0.173 0.090
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
Surface Mount SOT-23
D C L
A 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
0.039 0.043 0.051 0.004
E
H H
A1 0.000
A2 0.028 0.032 0.035 b 0.014 0.016 0.020
C 0.004 0.005 0.010
e
M
D 0.106 0.114 0.122 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
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AMC431
IMPORTANT NOTICE
ADDtek 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. ADDtek 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 ADDtek 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. ADDtek assumes to no liability to customer product design or application support. ADDtek warrants the performance of its products to the specifications applicable at the time of sale.
ADDtek Corp. 9F, No. 20, Sec. 3, Bade Rd., Taipei, Taiwan, 105 TEL: 2-25700299 FAX: 2-25700196
Copyright (c) 2006 ADDtek Corp.
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