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| (R) SPX4041 Precision 1.24V Shunt Voltage Reference FEATURES N/C 1 8 CATHODE Voltage Tolerance........................1% and 2% SPX4041 N/C 2 7 N/C Wide Operating Curren..........100A to 15mA 8 Pin nSOIC Low Temperature Coefficient.........50ppm/C N/C 3 6 N/C Fixed Reverse Breakdown Voltage.......1.24V 5 N/C ANODE 4 No Output Capacitance Required Two Terminal "Zener" Operation Now Available in Lead Free Packaging Improved Replacement for TL431 APPLICATIONS Constant Current Source Digital Voltmeter Power Management Precision Regulators Battery Powered Equipment Instrumentation Automotive Electronics Data Acquisition Systems DESCRIPTION The SPX4041 is a 2-terminal, temperature compensated, band-gap voltage reference which provides a fixed 1.24V output for input currents between 160A and 15mA. The bandgap voltage (1.24V) is independently laser trimmed from the output voltage to achieve a very low temperature coefficient, then the output voltage is trimmed to 1.24V. This trimming technique and the low temperature coefficient (A grade: 50 ppm/C) thin film resistor process gives a very stable device over the full temperature range. The SPX4041 is available in the sub miniature 3 pin SOT-23, 3 pin TO-92 or 8 pin NSOIC packages. The operating temperature is -40C to 85C. The SPX4041 advanced design eliminates the need for an external stabilized capacitor while insuring stability with any capacitive load, making it easy to use. TYPICAL APPLICATIONS CIRCUIT Cathode (K) + 1.24V Anode (A) Figure 1: Block Diagram Date: 11/29/04 SPX4041 Precision 1.24V Shunt Voltage Reference (c) Copyright 2004 Sipex Corporation 1 ABSOLUTE MAXIMUM RATINGS Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Reverse Current (IKA)) ...................................... 20mA Forward Current (IAK) ....................................... 10mA Operating Temperature Range (TA) ...... -40 to +85C Junction Temperature (TJ) .............................. 150C Storage Temperature (TSTG) ................ - 65 to 150C Lead Temperature (Soldering 10 sec.), TL ......... 300C ELECTRICAL CHARACTERISTICS PARAMETER Reverse Breakdown Voltage Reverse Breakdown Tolerance Dynamic Output Impedance Noise Voltage Temperature Coefficient Turn-on Setting Temperature Range (TA) Operating Current Range Thermal Resistance TO-92 JA TO-92 JC SOIC-8 JA SOIC-8 JC SOT-23 JA SOT-23 JC IIN = 1000A, TA = 25C, unless otherwise specified. SPX4041A CONDITIONS IR=500A IR=500A -40CTA85C 0.60 0.1kHzf10Hz Note 1 0.1% of VOUT -40 0.5 160 80 175 45 575 150 30 85 5.0 15.0 -40 0.5 15 100 MIN. TYP. 1.24 12 29 2.00 MAX MIN. SPX4041 TYP. 1.24 25 49 0.60 15 100 30 85 5.0 15.0 160 80 175 45 575 150 2.00 MAX. UNIT V mV VPP ppm/c s C mA C/W Note 1. Three-point measurement guarantees the error band over the specified temperature range. *CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC) ppm 0 % 0 mV 0 VKA TC in mV/C = T VKA (mV) TA -5 5000 0.5 TC in % /C = ( VKA VKA at 25C TA ) x 100 0 15 30 45 60 75 90 105 TC in ppm/C = ( VKA VKA at 25C TA ) x 106 Junction Temperature (C) 0.033 mV/C 0.0027 %/C 27 ppm/C Figure 2. VREF vs. Temperature Date: 11/29/04 SPX4041 Precision 1.24V Shunt Voltage Reference (c) Copyright 2004 Sipex Corporation 2 TYPICAL PERFORMANCE CHARACTERISTICS 15.0 Temperature Range: 0C to 105C 12.5 VIN VKA IK - Cathode Current (mA) 10.0 7.5 5.0 2.5 IK 0 -2.5 -5.0 -7.5 -10.0 -2 -1 0 1 1.24 2 3 VKA - Cathode Voltage (V) Figure 3. Test Circuit for VKA=VREF Figure 4. High Current Operating Characteristics 900 IK = 10mA 1.26 800 700 600 = VKA = VREF Temperature Range: 0C to 105C 1.25 VREF - Reference Voltage (V) IK - Cathode Current (A) 500 400 105 C 300 25 C 200 -0 C 100 0 1.24 1.23 1.22 1.21 1.20 -100 -200 1.24 -1.0 -0.5 0 0.25 0.5 0.75 1.0 1.25 1.5 -60 -30 0 30 60 90 TA - Ambient Temperature (C) VKA - Cathode Voltage (V) Figure 5. Reference Voltage vs. Ambient Temperature 70 Figure 6. Low Current Operating Characteristics 0.150 IKA = 160A to 15mA f 1kHz 60 0.125 50 ZKA Dynamic Impedance () IK = 10mA TA = 25C 0.100 40 Noise Voltage nV/Hz 0.075 30 0.050 20 0.025 10 0.0 -60 -30 0 30 60 90 120 100 1k 10 k 100 k 0 10 f - Frequency (Hz) TA - Free Air Temperature Figure 7. Noise Voltage vs Frequency Date: 11/29/04 Figure 8. Low Frequency Dynamic Ouput Impedance vs TA SPX4041 Precision 1.24V Shunt Voltage Reference (c) Copyright 2004 Sipex Corporation 3 TYPICAL PERFORMANCE CHARACTERISTICS VIN 180 VOUT IK fp = 100kHz 50 GND Figure 9. Frequency=100kHz, IK=10mA, TA=25C Figure 10. Test Circuit for Pulse Response APPLICATION INFORMATION This device is designed for stable operation and has no need of an external capacitor. The reference remains stable if a bypass capacitor is used. SOT-23 The SPX4041 in the SOT-23 package has a parasitic Schottky diode between pin 3 and pin 1. Pin 1 of SOT-23 must float or be connected to pin 3. Conventional Shunt Regulator In a conventional shunt regulator application (see Figure 11), an external series resister (RS) is connected between the supply voltage and the SPX4041. RS determines the current that flows through the load (IL) and the reference (IQ). Since load current and supply voltage may vary, RS should be small enough to supply at least the minimum acceptable IQ to the reference even when the supply voltage is at its minimum and the load current is at its maximum value. When the supply voltage is at its maximum and IL is at its minimum, RS should be large enough so that the current flowing through the SPX4041 is less than 15mA. RS is determined by the supply voltage (VS), the load and operating current (IL and IQ), reference's reverse breakdown voltage (VR). RS = (VS - VR)/(IL+IQ) VS VIN RS IQ + I L 3k VOUT SPX4041 VR IL VOUT IQ SPX4041 Figure 11. SPX4041 Fixed Shunt Regulator Date: 11/29/04 Figure 12 1.24V Reference Circuit (c) Copyright 2004 Sipex Corporation SPX4041 Precision 1.24V Shunt Voltage Reference 4 V IN = 12V to 20V 86.7 k 500 k LO = Battery Low 1M 7 3+ 2 LM4250 12V + 6 8 22 M 3.5 M 150 pF 500 k 150 pF SPX4041 SPX4041 - 4 500 k Figure 13. Low Battery Detector Figure 14. Micropower 10V Reference PACKAGE PINOUTS 8-Pin SOIC (S) N/C N/C N/C 1 2 3 4 8 7 6 5 + N/C N/C N/C SOT-23-3 (M) 1 1 TO-92 (N) + 2 3 +2 -3 Bottom View Top View - Top View Date: 11/29/04 SPX4041 Precision 1.24V Shunt Voltage Reference (c) Copyright 2004 Sipex Corporation 5 PACKAGE: 8 PIN NSOIC D e O E/2 E1/2 E1 L2 E Seating Plane O1 L1 1 L Gauge Plane O b VIEW C INDEX AREA (D/2 X E1/2) TOP VIEW A A1 Seating Plane A2 SIDE VIEW 8 Pin NSOIC JEDEC MO-012 (AA) Variation MIN NOM MAX SYMBOL A 1.35 1.75 A1 0.1 0.25 A2 1.25 1.65 b 0.31 0.51 c 0.17 0.24 4.90 BSC D 6.00 BSC E 3.90 BSC E1 1.27 BSC e L 0.4 1.27 1.04 REF L1 0.25 BSC L2 o 0 8 o1 5 15 Note: Dimensions in (mm) B B SEE VIEW C b c BASE METAL SECTION B-B WITH PLATING Date: 11/29/04 SPX4041 Precision 1.24V Shunt Voltage Reference (c) Copyright 2004 Sipex Corporation 6 PACKAGE: 3 PIN SOT-23 D b 3 B B E1 E SEE VIEW C VIEW A-A 1 e 2 e1 L L1 Gauge Plane Seating Plane O VIEW C A A A2 Seating Plane 3 Pin SOT-23 SYMBOL A A1 A2 b c D e e1 E E1 L L1 o JEDEC TO-236 (AB) Variation MIN NOM MAX 0.89 1.12 0.01 0.1 0.88 0.95 1.02 0.3 0.5 0.08 0.2 2.8 2.9 3.04 0.95 BSC 1.90 BSC 0.95 2.64 1.2 1.3 1.4 0.4 0.5 0.6 0.54 REF 0 8 A C A1 SIDE VIEW b WITH PLATING c Note: Dimensions in (mm) BASE METAL SECTION B-B Date: 11/29/04 SPX4041 Precision 1.24V Shunt Voltage Reference (c) Copyright 2004 Sipex Corporation 7 PACKAGE: 3 PIN TO-92 L e e1 W D A b S1 SYMBOL A b E e e1 L R S1 W D a 3 Pin TO-92 MIN NOM 0.17 0.014 0.13 0.95 0.045 0.5 0.085 0.045 0.016 0.175 4 - MAX 0.195 0.02 0.155 0.105 0.055 0.61 0.095 0.06 0.022 0.195 6 R E Note: Dimensions in (inches) a(2x) Date: 11/29/04 SPX4041 Precision 1.24V Shunt Voltage Reference (c) Copyright 2004 Sipex Corporation 8 ORDERING INFORMATION Part Number SPX4041AM SPX4041AM/TR SPX4041AS SPX4041AS/TR SPX4041AN SPX4041AN/TR SPX4041M SPX4041M/TR SPX4041S SPX4041S/TR SPX4041N SPX4041N/TR Accuracy 1.0% 1.0% 1.0% 1.0% 1.0% 1.0% 2.0% 2.0% 2.0% 2.0% 2.0% 2.0% Output Voltage 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V 1.24V Package Type 3-Pin SOT-23 3-Pin SOT-23 8-Pin NSOIC 8-Pin NSOIC 3-Pin TO-92 3-Pin TO-92 3-Pin SOT-23 3-Pin SOT-23 8-Pin NSOIC 8-Pin NSOIC 3-Pin TO-92 3-Pin TO-92 Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX4041S/TR = standard; SPX4041S-L/TR = lead free /TR = Tape and Reel Pack quantity is 2,000 for TO-92, 2,500 for NSOIC and SOT-23. CLICK HERE TO ORDER SAMPLES (R) ANALOG EXCELLENCE Sipex Corporation Headquarters and Sales Office: 233 Hillview Dr Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Date: 11/29/04 SPX4041 Precision 1.24V Shunt Voltage Reference (c) Copyright 2004 Sipex Corporation 9 |
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