SPX1431S

® SPX1431 Precision Adjustable Shunt Regulator FEATURES ■ Trimmed Bandgap Reference to 0.4% ■ Wide Operating Current 1mA to 150mA ■ Extended Temperature Range: -55°C to 125°C ■ Low Temperature Coefficient 30 ppm/°C ■ Offered in TO-92, SOIC, SOT-89, SOT-23-5 ■ Improved Replacement in Performance for LT1431 ■ Low Cost Solution DESCRIPTION APPLICATIONS ■ Battery Operating Equipment ■ Adjustable Supplies ■ Switching Power Supplies ■ Error Amplifiers ■ Single Supply Amplifier ■ Monitors / VCRs / TVs ■ Personal Computers The SPX1431 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference. The SPX1431 acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX1431's thermal stability, wide operating current (150mA) and temperature range (-55°C to 125°C) makes it suitable for a variety of applications that require a low cost, high performance solution. SPX1431 tolerance of 0.4% 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 manufacturer's assembly lines and contributes a significant cost savings. The output voltage may be adjusted to any value between VREF and 36 volts with two external resistors. The SPX1431 is available in TO-92, SOIC-8, SOT-89, and SOT-23-5 packages. BLOCK DIAGRAM Cathode (K) Reference (R) + 2.5V Anode (A) Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 1 ABSOLUTE MAXIMUM RATINGS Cathode-Anode Reverse Breakdown VKA ....................................... 37V Anode-Cathode Forward Current, (25°C. ELECTRICAL CHARACTERISTICS Electrical characteristics at 25°C IK = 10mA VK = VREF, unless otherwise specified. PARAMETER SPX1431 Reference Voltage ∆VREF withTemp.* Ratio of Change in VREF to Cathode Voltage Reference Input Current IREF Temp Deviation Min IK for Regulation Off State Leakage Dynamic Output Impedance VREF TC ∆ VREF ∆V K IREF ∆IREF IK(MIN) IK(OFF) ZKA 2 2 2 3 3 3 2 4 2 VREF = 0V, VKA = 36V ƒz ≤ 1kHz IK = 1 to 150mA TJ = 0°C to 105°C Vk = 3V to 36V -2.0 TJ = 0°C to 105°C 2.490 2.465 2.500 0.07 -1.1 0.7 0.4 0.4 0.04 0.15 1.9 1.2 1 250 0.5 2.510 2.535 0.20 V V mV/°C mV/V µA µA mA nA Ω SYMBOL FIGURE CONDITIONS MIN TYP MAX UNITS Operating Range (TJ ) = - 55°C to 125°C. * See appropiate test circuit (Figure 2) Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 2 CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC) ppm 0 % 0 mV 0 ∆VREF • TC in mV/°C = ∆T ∆VREF (mV) ∆ TA -10 5000 0.5 • TC in %/°C = ( ( ∆VREF ∆VREF at 25°C ∆ TA ∆VREF ∆VREF at 25°C ∆ TA ) ) x 100 x 106 0 15 30 45 60 75 90 105 • TC in ppm/°C = Junction Temperature (°C) 0.07 mV/°C 0.003 %/°C 27 ppm/°C Figure 1. VREF VS Temperature. TEST CIRCUITS VIN VKA = VREF VIN VKA VIN VKA IK (OFF) IREF IK R1 IREF (VREF) R2 IK Figure 2. Test Circuit for VKA = VREF Figure 3. Test Circuit for VKA > VREF Figure 4. Test Circuit for IKOFF Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 3 TYPICAL PERFORMANCE CHARACTERISTICS 150 125 100 IK Cathode Current (mA) VKA = VREF 0°C to 105°C 2.53 2.52 VKA = VREF IK = 10mA VREF Reference Voltage (V) 3 75 50 25 0 -25 -50 -75 -100 -2 -1 0 1 2 VKA Cathode Voltage (V) 2.51 2.50 2.49 2.48 2.47 2.46 2.45 -60 -30 0 30 60 90 120 TA Ambient Temperature (°C) Figure 5. High Current Operating Characteristics Figure 6. Reference Voltage VS Ambient Tempetature 900 VKA = VREF 0° to 105°C 700 IK Cathode Current (µA) 600 500 400 300 200 100 0 -100 -200 -1.0 IREF Reference Input Current (µA) 800 3.0 2.5 2.0 1.5 1.0 0.5 0 -60 R1 = 10kΩ R2 = ∞ IK = 10mA 105°C 25°C -0°C 1.0 2.0 VKA Cathode Voltage (V) 0 3.0 -30 0 30 60 90 120 TA Ambient Temperature (°C) Figure 7. Low Current Operating Characteristics Figure 8. Reference Input Current VS Ambient Temperature 0 70 60 50 40 30 20 10 0 10 VKA = VREF IK = 10mA TA = 25°C 100 1K 10K 100K -10 0°C ∆VREF (mV) -20 25°C 75°C -30 IKA = 10mA -40 125°C -50 0 3 6 9 12 15 18 21 24 27 30 VKA Cathode Voltage (V) Noise Voltage nV√Hz f Frequency (Hz) Figure 9. Reference Voltage Line Regulation VS Cathode Voltage and TAMBIENT Rev. 08/13/02 Figure 10. Noise Voltage VS Frequency SPX1431 Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 4 TYPICAL PERFORMANCE CHARACTERISTICS (continued) 0.150 REF LEVEL 60.000dB 0.0deg /DIV 10.000dB 45.000deg MARKER 19 422 MAG (A/R) MARKER 19 422 PHASE (A/R) 611.000Hz -0.125dB 611.000Hz 46.717deg ZKA Dynamic Impedance (Ω) 0.125 0.100 0.075 0.050 0.025 0.0 -60 VKA = VREF IK = 1 to 100mA f≤1kHz PHASE GAIN -30 0 30 60 90 120 10 100 1K 10K 100K 1M 10M START 10.000Hz STOP 50 000 000.000Hz TA Free Air Temperature Figure 11. Low Frequency Dynamic Output Impedance VS TAMBIENT Figure 12. Small Signal Gain and Phase VS Frequency; IK = 10mA, TA = 25°C VOUT 230Ω 9µF 15kΩ IK VOUT VIN VIN 8.25kΩ GND Figure 13. Test Circuit for Gain and Phase Frequency Response Figure 14. Frequency = 100kHz, IK = 10mA, TA = 25°C VIN 250Ω IK Cathode Current (mA) 100 90 A: VKA = VREF B: VKA= 5V at IK=10mA C: VKA=10V at IK=10mA D: VKA=15V at IK=10mA C VOUT IK fp = 100kHz 50Ω 80 70 60 50 40 STABLE A STABLE 30 20 10 0 100 TA = 25°C B D GND Figure 15. Test Circuit for Pulse Response 101 102 103 104 105 106 107 CL Load Capacitance (pF) Figure 16. Stability Boundary Conditions Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 5 TYPICAL PERFORMANCE CHARACTERISTICS (continued) 150 Ω IK R 100 TA = 25 °C IK = 1mA to 100mA 10 ZKA - Dynamic CL 1.0 10kΩ 0.1 0.01 1K 10K 100K 1M 10M f - Frequency (Hz) Figure 17. Test Circuit for Stability Figure 18. Dynamic Output Impedance TA = 25°C, IK = 1 to 100mA 100 VIN R3 VOUT IKOFF Cathode Current (nA) 10 VKA = 36V VREF = 0V 1 R1 0.1% VREF SPX1431 0.1 R2 0.1% 0.01 -50 0 50 100 150 TA Ambient Temperature (°C) Figure 19. Off State Leakage Figure 20. Shunt Regulator VOUT = (1+R1/R2)VREF VIN ISINK R2 Q1 VOUT R3 Opto Isolator R1 0.1% Isolated Feedback R3 sets feedback gain, C1 provides feedback compensation SPX1431 C1 R1 0.1% C2 + SPX1431 R2 0.1% VOUTRTN Figure 21. Constant Current, Sink, ISINK = VREF/R1 Figure 22. Reference Amplifier for Isolated Feedback in Off-Line DC-DC Converters © Copyright 2002 Sipex Corporation Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator 6 TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN R5 R4 VIN VOUT R1 0.1% R3 C1 SPX1431 R1 0.1% R2 0.1% R3 VOUT R2 0.1% SPX1431 Q1 Figure 23. Precision High Current Series Regulator VOUT = (1+R1/R2)VREF Figure 24. High Current Shunt Regulator VOUT = (1+R1/R2)VREF VCC R2 * Resistor values are chosen such that the effect to IREF is negligible. VOUT VIN R1 SPX1431 Figure 25. Single Supply Comparator with Temperature Compensated Threshold. VIN threshold = 2.5V Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 7 PACKAGES 8-Pin Surface Mount (S) SOT-23-5 (M5) REF 1 2 3 4 8 7 6 5 REF ANODE ANODE N/C 5 1 N/C 2 N/C ANODE 4 3 1 REF 2 3 CATHODE ANODE 1 2 3 SOT-89 (M1) TO-92 (N) CATHODE ANODE ANODE N/C CATHODE REF ANODE CATHODE Top View Top View Top View Bottom View PACKAGE: 8 PIN PLASTIC SMALL OUTLINE (SOIC) (NARROW) 4.0 (0.158) 3.8 (0.150) 5.2 (0.205) 4.6 (0.181) 6.2 (0.244) 5.8 (0.228) Pin 1 1.27 (0.50) BSC 1.75 (0.069) 1.35 (0.053) 0.78 (0.031) 0.61 (0.024) 5.0 (0.197) 4.8 (0.188) 0.37 (0.015) BSC 0.77 (0.030) 0.64 (0.025) 7 ° (4 PLCS) 45 ° 3 ° -6 ° 0.56 (0.022) 0.49 (0.019) 0.45 (0.018) 0.35 (0.014) 0.20 (0.008) 0.10 (0.004) 0.22 (0.009) 0.19 (0.007) 7 ° (4 PLCS) Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 8 PACKAGE: 5 Lead SOT23 b C L e E e1 D C L A A2 A C L a 0.20 DATUM 'A' C A1 A .10 E1 L 2 SYMBOL A A1 A2 b C D E E1 L e e1 a MIN 0.90 0.00 0.90 0.25 0.09 2.80 2.60 1.50 0.35 0.95ref 1.90ref 0 O MAX 1.45 0.15 1.30 0.50 0.20 3.10 3.00 1.75 0.55 10 O Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 9 PACKAGE: 3 Lead SOT-89 C A C N P 1 2 3 K B F G -TD STYLE 1 PIN 1. BASE 2. COLLECTOR 3. EMITTER STYLE 3 PIN 1. GATE 2. ANODE 3. CATHODE DIM A B C D E F G J K L N P STYLE 2 PIN 1. ANODE 2. CATHODE 3. NO CONNECTION STYLE 4 PIN 1. DRAIN 2. GATE 3. SOURCE MILLIMETERS MIN MAX 4.40 4.60 2.29 2.60 140 160 0.36 0.48 1.62 1.80 0.44 0.53 150 BSC 0.35 0.44 0.80 1.04 300 BSC 2.04 2.28 3.94 4.25 INCHES MIN MAX 0.174 0.181 0.091 0.102 0.056 0.062 0.015 0.018 0.064 0.070 0.018 0.020 0.059 BSC 0.014 0.017 0.032 0.040 0.118 BSC 0.081 0.089 0.156 0.167 Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 10 PACKAGE: 0.090 (2.286) Radius typ. 2 13 TO-92 0.145 (3.683) 0.135 (3.429) 0.055 (1.397) 0.045 (1.143) 10° typ. BOTTOM VIEW 0.185 (4.699) 0.045 (1.143) 0.085 (2.159) Diameter 5° typ. 0.185 (4.699) 0.175 (4.445) 0.090 (2.286) typ. 5° typ. Seating Plane 0.025 (0.635) Max Uncontrolled Lead Diameter 0.500 (12.70) Min. 0.016 (0.406) 0.014 (0.356) 0.055 (1.397) 0.045 (1.143) 0.105 (2.667) 0.095 (2.413) 0.0155 (0.3937) 0.0145 (0.3683) Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 11 ORDERING INFORMATION PART NUMBER ACCURACY OUTPUT VOLTAGE PACKAGES SPX1431M5 ......................... 0.4% ..................... 2.5V ............................ 5-Pin SOT-23 SPX1431M1 ......................... 0.4% ..................... 2.5V ............................ 3-Pin SOT-89 SPX1431S ............................ 0.4% ..................... 2.5V ................................ 8-Pin SOIC SPX1431N ............................ 0.4% ..................... 2.5V .............................. 3-Pin TO-92 Corporation SIGNAL PROCESSING EXCELLENCE Sipex Corporation Headquarters and Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 12