AMC DOC. #: AMC431_C November 2002 AMC431 ADD MICROTECH CORP. PRECISION ADJUSTABLE SHUNT VOLTAGE REFERENCE 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 Ω; 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. APPLICATIONS ! ! ! ! ! PACKAGE PIN OUT Voltage Reference Precision shunt regulator High current shunt regulator PWM down converter with reference Voltage monitor ANODE VREF ANODE ANODE ANODE ANODE NC NC 8-Pin Plastic S.O.I.C. Surface Mount (Top View) 3-Pin Plastic TO-92 (Top View) VREF CATHODE ANODE VREF CATHODE CATHODE CATHODE ANODE ANODE VREF CATHODE VREF (Note 1) 3-Pin Plastic SOT-23 Surface Mount (Top View) 3-Pin Plastic SOT-89 Surface Mount (Top View) (Note 2) 3-Pin Plastic SOT-23 Surface Mount (Top View) ORDER INFORMATION TA (°C) 0 to 70 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 -- -- -- 1% AMC431DM AMC431LP 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. Copyright 2002, ADD Microtech Corp. 1 www.addmtek.com AMC431 AMC DOC. #: AMC431_C November PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS 2002 TYPICAL APPLICATION BLOCK DIAGRAM VO = 5V V+ CATHODE Rb Note: Rb should provide cathode current ≥ 1mA R1 27.5K 0.1% + REF - R2 27.5K 0.1% 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) 150°C Maximum junction temperature range, TJ Storage temperature range -65OC to 150OC Lead temperature (soldiering, 10 seconds) 260°C 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 θJA Derating factor DF(mW/°C) TA ≥ 25°C (°C /W ) TA ≤ 25°C Power rating(mW) TA=70°C Power rating(mW) TA= 85°C Power rating (mW) DM 165 6.06 757 485 394 LP 156 6.41 801 513 417 PK 71(note) 14.1 1763 1128 916 DB 285 3.5 438 280 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 2002, ADD Microtech Corp. 2 228 www.addmtek.com AMC431 AMC DOC. #: AMC431_C November PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS 2002 RECOMMENDED OPERATING CONDITIONS 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 Reference Input Voltage Reference Input Voltage Reference Input Voltage Reference Drift Voltage Ratio, Ref to Cathode (note 4) Symbol VREF VREF VREF Test Conditions AMC431 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 IK = 10mA, VKA = 2.5V to 36V IK = 10mA,VKA = VREF IK = 10mA,VKA = VREF, 0°C ≤ TA ≤ 70°C 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 Reference Input Current Copyright 2002, ADD Microtech Corp. Units IREF 3 -1.4 -2.7 mV/V 2 0.4 2.3 4 1 mA 0.1 1 µA 0.2 0.5 Ω µA www.addmtek.com AMC431 AMC DOC. #: AMC431_C November PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS 2002 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 2002, ADD Microtech Corp. 4 www.addmtek.com AMC431 AMC DOC. #: AMC431_C November PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS 2002 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 µA) IKA – Cathode Current (µ 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 3 5 IREF – Reference Input Current (µ µA) VREF – Reference Input Voltage (mV) 2600 VKA = VREF 2560 2540 2520 IKA = 100mA 2500 2480 2 REFERENCE INPUT CURRENT vs FREE-AIR TEMPERATURE REFERENCE INPUT VOLTAGE vs FREE-AIR TEMPERATURE 2580 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 2002, ADD Microtech Corp. 5 -50 -25 0 25 50 75 TA – Free-Air Temperature - °C 100 125 www.addmtek.com AMC431 AMC DOC. #: AMC431_C November PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS 2002 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 5. Single –Supply Comparator With Temperature compensated threshold. Figure 4. Shunt Regulator VBATT VO VO VBATT R1 R1 AMC431 R2 R2 AMC431 C VO = (1 + R1/R2) × VREF Figure 7. Crowbar Circuit Figure 6. High-Current Shunt Regulator Copyright 2002, ADD Microtech Corp. 6 www.addmtek.com AMC431 AMC DOC. #: AMC431_C November PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS 2002 APPLICATION INFORMATION (continued) VBATT VO = 5V/1.5A AMC317 VBATT 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 RCL 0.1% IN AMC78L05 Common OUT VO VBATT R1 IO 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 2002, ADD Microtech Corp. Figure 11. Precision Current Limiter 7 www.addmtek.com AMC431 AMC DOC. #: AMC431_C November PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS 2002 3-Pin Plastic TO-92 B INCHES K MILLIMETERS M MIN A G F C TYP MAX MIN TYP MAX A 0.175 0.180 0.205 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 F - 0.015 - - 0.38 - G - 0.050 - - 1.27 - - 0.150 - - 3.81 - 0.500 0.580 - 12.70 14.73 - J 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 2002, ADD Microtech 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 www.addmtek.com AMC431 AMC DOC. #: AMC431_C November PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS 2002 8-Pin Plastic S.O.I.C. B P F G D MIN TYP MAX MIN TYP MAX A 0.183 - 0.202 4.65 - 5.13 B 0.144 - 0.163 3.66 - 4.14 C 0.068 - 0.074 1.73 - 1.88 D 0.010 - 0.020 0.25 - 0.51 F - 0.035 0.38 - 0.89 0.015 G L J C SEATING PLAN seating plane MILLIMETERS INCHES A M K J 0.050 BSC 0.007 - 1.27 BSC 0.010 0.19 - 0.25 K 0.005 - 0.010 0.13 - 0.25 L 0.189 - 0.205 4.80 - 5.21 M - - 8º - - 8º P 0.228 - 0.244 5.79 - 6.20 3-Pin Surface Mount SOT-89 INCHES A C D L B K N E M F J G H 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 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° - 8° 0° - 8° - 0.047 0.89 - 1.19 N 0.035 Copyright 2002, ADD Microtech Corp. 9 MILLIMETERS MIN www.addmtek.com AMC431 AMC DOC. #: AMC431_C November PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS 2002 Surface Mount SOT-23 D INCHES C MIN L H E A MIN TYP MAX 0.039 0.043 0.051 1.00 1.10 1.30 0.00 - 0.10 - 0.004 A2 0.028 0.032 0.035 0.70 0.80 0.90 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. b M e A A2 MAX A1 0.000 TYP MILLIMETERS A1 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 2002, ADD Microtech Corp. 10 www.addmtek.com AMC431 AMC DOC. #: AMC431_C November PRECISION ADJUSTABLE SHUNT VOLTAGE REGULATORS 2002 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. Asia Pacific region ADD Microtech Inc. 492 Altamont Drive Milpitas, CA 95035 ADD Microtech Corp 3F, 132, Sec. 4, Chung Hsiao E. Rd., Taipei, Taiwan T E L : (408) 9410420 FA X : (408) 9410864 T E L : 2-27760166 FA X : 2-27764208 Copyright 2002, ADD Microtech Corp. 11 www.addmtek.com