AMC431 PRECISION ADJUSTABLE SHUNT VOLTAGE REFERENCE www.addmtek.com DESCRIPTION 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 200mΩ. 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. 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 200mΩ; 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. APPLICATIONS PACKAGE PIN OUT Voltage Reference Precision shunt regulator High current shunt regulator PWM down converter with reference Voltage monitor CATHODE CATHODE ANODE ANODE VREF VREF 3-Pin Plastic TO-92 (Top View) 3-Pin Plastic SOT-23 Surface Mount (Top View) (Note 1) VREF CATHODE ANODE ANODE CATHODE VREF 3-Pin Plastic SOT-89 Surface Mount (Top View) Initial TA (°C) Tolerance 0 to 70 1.5% 1.5% 1% 1% 0.5% 0.5% LP TO-92 3-pin AMC431CLP 3-Pin Plastic SOT-23 Surface Mount (Note 2) (Top View) ORDER INFORMATION SOT-89 SOT-23 PK DB 3-pin 3-pin DB SOT-23 3-pin -- -- AMC431CLPF(Lead Free) -- -- --- AMC431LP AMC431PK AMC431DB AMC431RDB AMC431LPF(Lead Free) AMC431PKF(Lead Free) AMC431DBF(Lead Free) AMC431RDBF(Lead Free) AMC431BLP AMC431BPK AMC431BDB AMC431BRDB 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 © 2006 ADDtek Corp. 1 DD021_G -- JUNE 2006 AMC431 TYPICAL APPLICATION BLOCK DIAGRAM VO = 5V CATHODE V+ Rb REF R1 27.5K 0.1% Note: Rb should provide cathode current ≥ 1mA + - R2 27.5K 0.1% 5V Precision Regulator VREF ANODE 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 150°C -65OC to 150OC 260°C 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. POWER DISSIPATION TABLE TA=70°C Derating factor TA ≤ 25°C Power rating(mW) Power rating(mW) DF(mW/°C) TA ≥ 25°C 6.41 801 513 Package θJA (°C /W ) LP 156 LPF 156 6.41 801 513 417 PK 71(note) 14.1 1763 1128 916 PKF 71(note) 14.1 1763 1128 916 DB 285 3.5 438 280 228 DBF 285 3.5 438 280 228 TA= 85°C Power rating (mW) 417 Note :1.For PK package, Thermal Resistance-Junction to Tab ( θJT ) = 35°C /W. TJ = TTAB + (PD × θJT). PD: Power Dissipation. 2.θJA: Thermal Resistance-Junction to Ambient, DF = 1/θJA Junction Temperature Calculation: TJ = TA + (PD × θJA). The θJA numbers are guidelines for the thermal performance of the device/PC-board system. All of the above assume no ambient airflow. Copyright © 2006 ADDtek Corp. 2 DD021_G -- JUNE 2006 AMC431 RECOMMENDED OPERATING CONDITIONS Parameter Operating free air temperature range, TA Cathode current, IK Cathode voltage, VKA Min Max Units 0 1 0 70 100 36 °C mA V ELECTRICAL CHARACTERISTICS Unless otherwise specified, these specifications apply over the operating ambient temperatures with TA = 25°C. Parameter Symbol Reference Input Voltage Reference Input Voltage Reference Input Voltage Reference Drift Voltage Ratio, Ref to Cathode (note 4) VREF VREF VREF Reference Input Current IREF Minimum Operating Current Off-State Cathode Current IMIN IOFF Dynamic Impedance |ZKA | 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%. Note 4: VREF Test Conditions AMC431 Units 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, 0°C ≤ TA ≤ 70°C mV/ IK = 10mA, VKA = 2.5V to 36V -1.4 -2.7 V IK = 10mA,VKA = VREF 2.3 µA 2 4 IK = 10mA,VKA = VREF, 0°C ≤ TA ≤ 70°C VKA = VREF 0.4 1 mA VKA = 36V, VREF = 0V 0.1 1 µA VKA = VREF, IK = 1mA to 100mA, 0.2 0.5 Ω f ≤ 1kHz Ratio of change in reference input voltage to the change in cathode voltage VKA Copyright © 2006 ADDtek Corp. 3 DD021_G -- JUNE 2006 AMC431 PARAMETER MEASUREMENT INFORMATION Input VKA Input VKA R1 IREF R2 VRE Figure 2. Test Circuit for VKA > VREF Figure 1. Test Circuit for VKA = VREF Input VKA IOFF Figure 3. Test Circuit for IOFF Copyright © 2006 ADDtek Corp. 4 DD021_G -- JUNE 2006 AMC431 CHARACTERIZATION CURVES CATHODE CURRENT vs CATHODE VOLTAGE CATHODE CURRENT vs CATHODE VOLTAGE 150 125 800 VKA = VREF TA = 25°C VKA = VREF TA = 25°C 600 75 IKA – Cathode Current (µA) IKA – Cathode Current (mA) 100 50 25 0 -25 -50 Imin 400 200 0 -75 -100 -2 -200 -1 0 1 VKA – Cathode Voltage (V) 2 3 -1 2600 2580 3 5 VKA = VREF 2560 2540 2520 IKA = 100mA 2500 2480 2 REFERENCE INPUT CURRENT vs FREE-AIR TEMPERATURE IREF – Reference Input Current (µA) VREF – Reference Input Voltage (mV) REFERENCE INPUT VOLTAGE vs FREE-AIR EMPERATURE 0 1 VKA – Cathode Voltage (V) IKA = 10mA 2460 2440 4 R1 = 10 k Ω R2 = ∞ IKA = 10mA 3 2 1 2420 2400 -75 0 -50 -25 0 25 50 75 100 125 -75 TA – Free-Air Temperature - °C Copyright © 2006 ADDtek Corp. 5 -50 -25 0 25 50 75 TA – Free-Air Temperature - °C DD021_G -- 100 125 JUNE 2006 AMC431 APPLICATION INFORMATION VBATT R* VO R1 0.1% VBATT AMC431 VO AMC431 VREF Von ≈ 2V Voff ≈ VBATT Input R2 0.1% Vth = 2.5V GND VO = (1 + R1/R2) × VREF Note: R should provide 1mA cathode current to the AMC431 of minimum VBATT Figure 4. Shunt Regulator VBATT Figure 5. Single –Supply Comparator With Temperature compensated threshold. VO VBATT VO R1 R1 AMC431 R2 C R2 AMC431 VO = (1 + R1/R2) × VREF Figure 7. Crowbar Circuit Figure 6. High-Current Shunt Regulator Copyright © 2006 ADDtek Corp. 6 DD021_G -- JUNE 2006 AMC431 APPLICATION INFORMATION (continued) VBATT VBATT VO = 5V/1.5A AMC317 IO = VREF/RS Adjust 8.2KΩ 243Ω 0.1% AMC431 AMC431 RS 0.1% 243Ω 0.1% Figure 8.Precision 5V, 1.5A Regulator VBATT Figure 9. Precision Constant Current Sink AMC78L05 Common OUT VBATT VO R1 IO RCL 0.1% IN R1 AMC431 R2 AMC431 IOUT = (VREF/RCL) + IKA R1 = VBATT/((IO/hFE) + IKA) VO = (1 + R1/R2) × VREF Min VO = VREF + 5V Figure 10. Output Control of a Three-Terminal Fixed Regulator Copyright © 2006 ADDtek Corp. Figure 11. Precision Current Limiter 7 DD021_G -- JUNE 2006 AMC431 PACKAGE 3-Pin Plastic TO-92 B INCHES K MILLIMETERS M MIN A G MAX MIN TYP MAX A 0.175 0.180 0.205 TYP 4.45 4.57 5.21 B 0.170 0.180 0.210 4.32 4.57 5.33 C 0.125 0.142 0.165 3.18 3.62 4.19 - 0.38 - F F C - 0.015 - G - 0.050 - - 1.27 - J - 0.150 - - 3.81 - 0.500 0.580 - 12.70 14.73 - N K M - 5º - - 5º - N - 5º - - 5º - 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 P P1 INCHES MIN C C 0.079 P Ho W1 Wo W F1 Do Copyright © 2006 ADDtek Corp. Po Fo 8 MILLIMETERS TYP MAX MIN TYP MAX - - 2.00 - - 0.480 0.500 0.520 12.2 12.7 13.2 Po 0.488 0.500 0.512 12.4 12.7 13.0 Do 0.150 0.157 0.165 3.8 4.0 4.2 P1 0.230 0.250 0.256 5.85 6.35 6.85 Fo 0.165 0.197 0.220 4.2 5.0 5.6 W 0.669 0.709 0.748 17.0 18.0 19.0 Ho 0.610 0.630 0.649 15.5 16.0 16.5 Wo 0.224 0.236 0.248 5.7 6.0 6.3 W1 0.335 0.354 0.374 8.5 9.0 9.5 DD021_G -- JUNE 2006 AMC431 3-Pin Surface Mount SOT-89 INCHES A C D L B K E N M F MIN TYP MAX MIN TYP MAX A 0.173 - 0.181 4.39 - 4.59 B 0.090 - 0.102 2.28 - 2.59 C 0.055 - 0.063 1.39 - 1.60 D 0.015 - 0.017 0.38 - 0.43 E 0.084 - 0.090 2.13 - 2.28 F 0.016 - 0.019 0.33 - 0.48 G 0.059 BSC 1.49 BSC H 0.118 BSC 2.99 BSC J J G H MILLIMETERS 0.018 - 0.022 0.45 - 0.55 K 0.155 - 0.167 3.94 - 4.24 L 0.067 - 0.072 1.70 - 1.82 M 0° N 0.035 - 8° 0° - 8° - 0.047 0.89 - 1.19 MAX MIN TYP MAX Surface Mount SOT-23 D C INCHES MIN L A 1.00 1.10 1.30 0.004 0.00 - 0.10 A2 0.028 0.032 0.035 0.70 0.80 0.90 b M e A A2 A1 MILLIMETERS 0.039 0.043 0.051 A1 0.000 H H E TYP - 0.014 0.016 0.020 0.35 0.40 0.50 C 0.004 0.005 0.010 0.10 0.15 0.25 D 0.106 0.114 0.122 2.70 2.90 3.10 E 0.055 0.063 0.071 1.40 1.60 1.80 e 0.075 TYP. 1.90 TYP. H 0.102 0.110 0.118 2.60 2.80 3.00 L 0.015 - - 0.37 - - M 1° 5° 9° 1° 5° 9° b Copyright © 2006 ADDtek Corp. 9 DD021_G -- JUNE 2006 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 © 2006 ADDtek Corp. 10 DD021_G -- JUNE 2006