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| SPX431 Precision Adjustable Shunt Regulator FEATURES * Trimmed Bandgap to 0.5% * Wide Operating Current..........................1mA to 150mA * Extended Temperature Range....................0C to 105C * Low Temperature Coefficient ............................30 ppm/C * Offered in TO-92, SOIC, SOT-89, SOT-23-5 * Improved Replacement in Performance for TL431 * Low Cost Solution APPLICATIONS * Battery Operating Equipments * Adjustable Supplies * Switching Power Supplies * Error Amplifiers * Single Supply Amplifier * Monitors / VCR / TV * Personal Computers PRODUCT DESCRIPTION The SPX431 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate 0.5% bandgap reference. SPX431 acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX431 thermal stability, wide operating current (150mA) and temperature range (0C to 105C) makes it suitable for all variety of application that are looking for a low cost solution with high performance. SPX431 tolerance of 0.5% is proven to be sufficient to overcome all of the other errors in the system to virtually eliminate the need for trimming in the power supply manufactures assembly line and contribute a significant cost savings. The output voltage may be adjusted to any value between VREF and 36 volts with two external resistors. The SPX431 is operating an extended temperature range of 0C to 105C. The SPX431 is available in TO-92, SO-8, SOT-89, and SOT-23-5 packages. PIN CONFIGURATIONS 8-Pin Surface Mount (S) SOT-23-5 (M5) REF ANODE 4 SOT-89 (M1) TO-92 (N) 1 2 3 CATHODE ANODE ANODE N/C 1 2 3 4 8 7 REF ANODE ANODE N/C 5 SPX431 1 N/C 2 N/C 3 CATHODE 1 SPX431 2 3 CATHODE REF CATHODE SPX431 6 5 REF ANODE ANODE Top View Top View Top View Bottom View Rev. 10/30/00 SPX431 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 25 C TO-92 SOT-23 8L SOIC SOT-89 Junction Temperature Storage Temperature Lead Temperature (Soldering 10 sec.) SYMBOL VKA IAK IKA IREF PD ANODE (A) RATING 37 1 150 10 775 200 750 1000 150 - 65 to 150 300 UNITS V A mA mA mW mW mW mW C C C TJ TSTG TL Stresses greater than those listed under ABSULUTE 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 IK RATING VREF to 20 10 UNIT V mA TYPICAL THERMAL RESISTANCES PACKAGE TO-92 SOT-23 SOIC SOT-89 0JA 160 C/W 575 C/W 175 C/W 110 C/W 0JC 80 C/W 150 C/W 45 C/W 8 C/W TYPICAL DERATING 6.3 mW/C 1.7 mW/C 5.7 mW/C 9.1 mW/C Rev. 10/30/00 SPX431 ELECTRICAL CHARACTERISTICS at 25C IK @ 10mA VK = VREF, unless otherwise specified. Parameter Reference Voltage VREF with Temp. Ratio of Change in VREF to Cathode Voltage Reference Input Current IREF Temp Deviation Min IK for Regulation Off State Leakage Dynamic Output Impedance TC = Test Circuit Symbol VREF TC VREF VK IREF IREF IK(MIN) IK(OFF) ZKA Test Conditions TA = 25C Over Temp. VREF to 10V 10V to 36V Over Temp. VREF = 0V, VKA = 36V Test Circuit 1 1 1 2 2 2 1 3 1 Min 2.490 2.469 -2.7 -2 SPX431 Typ 2.503 0.07 -1.0 -0.4 0.7 0.4 0.4 0.04 0.15 Unit Max 2.515 2.536 0.20 0.3 4 1.2 1 250 0.5 V V mV/C mV/V A A mA nA Calculating Average Temperature Coefficient (TC) ppm % mV 0 0 0 VREF (mV) T A VREF VREF at 25C T A VREF VREF at 25C T A TC in mV/C = TC in %/C = -10 5000 0.5 -20 -55 -25 0 25 50 75 100 125 TC in ppm/C = Temperature (C) 0.06 mV/C 0.002 %/C 24 ppm/C TEST CIRCUITS VIN VKA = VREF VIN VKA VIN VKA IREF IK R1 (VREF) R2 IK IREF Figure 1a. Test Circuit 1 Figure 1b. Test Circuit 2 Figure 1c. Test Circuit 3 Rev. 10/30/00 ) ) VREF ) ) x 100 x 10 6 IK (OFF) SPX431 TYPICAL PERFORMANCE CURVES Low Current Operating Characteristics 900 800 700 600 VKA = VREF Temperature Range: -0C to 125 C 150 125 100 75 50 25 0 -25 -50 0 -100 -200 -1.0 0 1.0 2.0 3.0 -75 -100 -2 -1 0 1 2 3 High Current Operating Characteristics VKA= V REF Temperature Range: - 0C to 105 C IK - Cathode Current (A) 500 400 300 200 100 105 C 25 C -0 C IK - Cathode Current (mA) VKA - Cathode Voltage (V) VKA - Cathode Voltage (V) Figure 2 Off State Leakage 100 2.53 Figure 3 Reference Voltage vs. Ambient Temperature V KA= V REF IK = 10 mA VKA = 36V VREF = 0V IZ off - Off State Cathode Current (nA) 10 2.52 VREF - Reference Voltage (V) 2.51 2.50 1 VREF = 2.500 V at 25 C 2.49 2.48 0.1 2.47 2.46 0.01 -60 -30 0 30 60 90 120 2.45 -60 -30 0 30 60 90 120 TA - Ambient Temperature ( C) Figure 4 TA - Ambient Temperature ( C) Figure 5 Rev. 10/30/00 SPX431 TYPICAL PERFORMANCE CURVES Reference Input Current 3.0 0 Reference Voltage Line Regulation R1 = 10 k R2 = IK = 10 mA -10 2.5 IREF - Reference Input Current ( A) 2.0 VKA - Cathode Voltage (V) 0 C -20 25 C 75 C -30 1.5 1.0 105 C -40 0.5 0 -60 -30 0 30 60 90 120 -50 0 3 6 9 12 15 18 21 24 27 30 TA - Ambient Temperature ( C) Figure 6 VKA - Cathode Voltage (V) Figure 7 Low Frequency Dynamic Output Impedance 0.150 VKA = VREF IKA = 1 to 100 mA f < 1 kHz Noise Voltage 70 60 0.125 50 40 ZKA - Dynamic Impedance ( ) V KA = V REF IK = 10 mA TA = 25C 10 100 1k 10 k 100 k Noise Voltage nV/Hz 0.100 0.075 30 0.050 20 0.025 10 0.0 -60 -30 0 30 60 90 120 0 f - Frequency (Hz) TA - Free Air Temperature Figure 8 Figure 9 Rev. 10/30/00 SPX431 TYPICAL PERFORMANCE CURVES Dynamic Output Impedance 100 TA = 25 C IK = 1 to 100 mA ZKA - Dynamic Impedance 10 1.0 0.1 0.01 1k 10 k 100 k 1M 10 M f - Frequency (Hz) Figure 10 Small Signal Voltage Gain vs. Frequency 70 Temperature Range: -0C to 105 C 60 AV - Small Signal Voltage Gain (dB) IK = 10 mA 50 OUT 40 15 k 9 F 30 IK 230 20 8.25 k GND 10 0 1k 10 k 100 k 1M 10 M f - Frequency (Hz) Figure 11 Rev. 10/30/00 SPX431 TYPICAL PERFORMANCE CURVES Pulse Response 6 5 INPUT INPUT MONITOR Input and Output Voltages (V) 220 OUT 4 3 OUTPUT 2 50 fP = 100 kHz 1 GND 0 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 t - Time ( s) Figure 12 Stability Boundary Conditions 100 90 A: B: C: D: V KA = V REF V KA = 5V at I K = 10 mA V KA = 10V at I K = 10 mA V KA = 15V at I K = 10 mA 80 70 C 150 IK IK - Cathode Current (mA) 60 50 40 STABILITY REGION 30 CL 20 A B D 10 k 10 TA = 25 C 0 100 101 102 103 104 105 106 107 C L - Load Capacitance (pF) Figure 13 Rev. 10/30/00 SPX431 ORDERING INFORMATION Ordering No. SPX431M5 SPX431M1 SPX431S SPX431N Precision 0.5% 0.5% 0.5% 0.5% Output Accuracy 2.5V 2.5V 2.5V 2.5V Packages 5 Lead SOT-23 5 Lead SOT-89 8 Lead SOIC 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. 10/30/00 |
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