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| SPX3431 Micropower 2.5V Precision Adjustable Shunt Regulator FEATURES * * * * * * Voltage Tolerance ..................................0.5% & 1.0% Wide Operating Current .................... 1mA to 100mA Extended Temperature Range .......................... 105C Low Temperature Coefficient ........................30 ppm/C Offered in SOT-23, TO-92 & SOT 89 Low Output Noise APPLICATIONS * * * * * * * Battery Operating Equipment Adjustable Supplies Switching Power Supplies Error Amplifiers Single Supply Amplifier Monitors / VCR / TV Personal Computers PRODUCT DESCRIPTION The SPX3431 is a 3-terminal Adjustable Shunt Voltage Regulator providing a highly accurate 0.5% bandgap reference. SPX3431 acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX3431 thermal stability, wide operating current (100mA) and temperature range (0C to 105C) makes it suitable for all variety of applications that are looking for a low cost solution with high performance. SPX3431 tolerance of 0.5% is proven to be sufficient to overcome all the other errors in the system to virtually eliminate the need for trimming in the power supply manufactures assembly line and contribute a big Cost Savings. In the standard shunt configuration, the combination of low temperature coefficient (T.C.), sharp turn-on characteristics, low output impedance and programmable output voltage make this precision reference an excellent error amplifier. The SPX3431 is a direct replacement for the SPX431 and TL431 in low voltage, low current applications. SPX3431 is also available in SOT-89 and TO-92. PIN CONNECTIONS SOT-23 Marking & pinout for the 0.5% device ANODE TO-92 (N) 1 2 3 SOT-23 Marking & pinout for the 1% device ANODE SOT-89 Marking & pinout for all devices SPX3431 CATHODE ANODE REF CATHODE REF SPX3432 1 SPX3431 2 3 CATHODE REF CATHODE ANODE REF Top View Top View Top View Top View Rev. 10/25/00 SPX3431 CATHODE (K) REFERENCE (R) + - 2.5V ABSOLUTE MAXIMUM RATINGS Parameter Cathode-Anode Reverse Breakdown Anode-Cathode Forward Current Operating Cathode Current Reference Input Current Continuous Power Dissipation at 25C SOT-23 Junction Temperature Storage Temperature Lead Temperature (Soldering 10 sec.) Symbol VKA IAK IKA IREF PD TJ TSTG TL ANODE (A) Rating 18 1 100 1 300 150 - 65 to 150 300 Units V A mA mA mW C C C 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. RECOMMENDED CONDITIONS Parameter Cathode Voltage Cathode Current Symbol VKA 1K Rating VREF to 18 10 Unit V mA TYPICAL THERMAL RESISTANCES Package SOT-23 SOT-89 TO-92 0JA 575 C/W 575 C/W 575 C/W 0JC 150 C/W 80 C/W 80 C/W Typical Derating 1.7 mW/C 9.1 mW/C 6.3 mW/C Rev. 10/25/00 SPX3431 ELECTRICAL CHARACTERISTICS are guaranteed over full junction temperature range (0C to 105C). Ambient temperature must be derated based on power dissipation and package thermal characteristics. The conditions are: VKA = VREF and IK = 10mA, unless otherwise specified. SPX3431A SPX3431 Parameter Symbol Test Condition Min Typ Max Min Typ Max Unit Circuit Reference Voltage VREF 2.490 2.503 2.515 2.475 2.500 2.525 V 1 TA = 25 C Over Temp. 2.480 2.530 2.450 2.550 V 1 TC 0.07 0.20 0.07 0.02 1 VREF with Temp* mV/C Ratio of Change in VREF -2.7 -1.01 -2.7 -1.01 VREF to 10 V VREF MV/V 2 to Cathode Voltage 10 V 10 18 V -2 -0.4 0.3 -2 -0.4 0.3 VK Reference Input Current IREF 0.7 4 0.7 4 2 A IREF Temp Deviation 0.4 1.2 0.4 1.2 2 IREF A Min IK for Regulation VREF = 0V IK (MIN) 0.4 1 0.4 1 mA 1 VKA = 18V Off State Leakage IK (OFF) 0.04 500 0.04 500 nA 3 Dynamic Output f < 1 kHz IK = ZKA 0.15 0.5 0.15 0.5 1 Impedance 1 to 100mA Calculating Average Temperature Coefficient (TC) ppm % mV 0 0 0 VREF TC in mV/C = VREF (mV) TA VREF VREF at 25C TA VREF VREF at 25C TA 2000 0.2 -5 TC in %/C = ) ) -10 0 15 30 45 60 75 90 105 TC in ppm/C = Temperature (C) 0.019 mV/C 0.001 %/C 7.6 ppm/C ) ) x 100 x 106 Rev. 10/25/00 SPX3431 Test Circuits VIN VKA = VREF VIN VKA VIN VKA IREF IK R1 (VREF) R2 IK IK (OFF) Figure 1a. Test Circuit 1 Figure 1b. Test Circuit 2 Figure 1c. Test Circuit 3 Rev. 10/25/00 SPX3431 ORDERING INFORMATION Ordering No. SPX3431M SPX3431AM SPX3431M1 SPX3431AM1 SPX3431N SPX3431AN Precision 1% 0.5% 1% 0.5% 1% 0.5% Output Accuracy 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V Packages 3 Lead SOT-23 3 Lead SOT-23 3 Lead SOT-89 3 Lead SOT-89 3 Lead TO-92 3 Lead TO-92 Corporation SIGNAL PROCESSING EXCELLENCE Sipex Corporation Headquarters and Main Offices: 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 935-7600 FAX: (408) 934-7500 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others. Rev. 10/25/00 |
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