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 APPLICATIONS ■ Battery Operating Equipment ■ Adjustable Supplies ■ Switching Power Supplies ■ Error Amplifiers ■ Single Supply Amplifier ■ Monitors / VCRs / TVs ■ Personal Computers DESCRIPTION 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 1 © Copyright 2002 Sipex Corporation ABSOLUTE MAXIMUM RATINGS RECOMMENDED CONDITIONS Cathode-Anode Reverse Breakdown VKA ....................................... 37V Anode-Cathode Forward Current, (<10ms) IAK ................................. 1A Operating Cathode Current IKA .................................................. 150mA Reference Input Current IREF ........................................................ 10mA Continuous Power Dissipation at 25°C PD TO-92 ..................................................................... 775mW SOT-23 .................................................................. 200 mW SOIC-8 .................................................................... 750mW SOT-89 ................................................................. 1000mW PARAMETER SYMBOL RATING Cathode Voltage VKA VREF to 36 UNIT V Cathode Current IK 10 mA TYPICAL THERMAL RESISTANCES Junction Temperature TJ ........................................................... 150 °C Storage Temperature TSTG .............................................. -65 to 150 °C Lead Temperature (Soldering 10 sec.) TL .................................. 300°C PACKAGE NOTE: 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. 0JA 0JC TYPICAL DERATING TO-92 160°C/W 80°C/W 6.3 mW/°C SOT-23 575°C/W 150°C/W 1.7 mW/°C SOIC-8 175°C/W 45°C/W 5.7 mW/°C SOT-89 110°C/W 9.1mW/C° 8°C/W Typical deratings of the thermal resistances are given for ambient temperature >25°C. ELECTRICAL CHARACTERISTICS Electrical characteristics at 25°C IK = 10mA VK = VREF, unless otherwise specified. PARAMETER SYMBOL FIGURE CONDITIONS MIN TYP MAX UNITS 2.490 2.465 2.500 2.510 2.535 V V 0.07 0.20 mV/°C SPX1431 Reference Voltage ∆VREF withTemp.* VREF 2 2 TC 2 Ratio of Change in VREF to Cathode Voltage ∆ VREF ∆VK 3 Reference Input Current IREF 3 IREF Temp Deviation ∆IREF 3 Min IK for Regulation IK(MIN) 2 Off State Leakage IK(OFF) 4 ZKA 2 Dynamic Output Impedance TJ = 0°C to 105°C Vk = 3V to 36V TJ = 0°C to 105°C -2.0 -1.1 mV/V 0.7 1.9 µA 0.4 1.2 µA 0.4 1 mA VREF = 0V, VKA = 36V 0.04 250 nA ƒz ≤ 1kHz IK = 1 to 150mA 0.15 0.5 Ω Operating Range (TJ ) = - 55°C to 125°C. * See appropiate test circuit (Figure 2) Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator 2 © Copyright 2002 Sipex Corporation CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC) ppm 0 % mV 0 0 • TC in mV/°C = ∆VREF ∆VREF (mV) ∆ TA ∆T -10 5000 • TC in %/°C = 0.5 0 15 30 45 60 75 90 • TC in ppm/°C = 105 Junction Temperature (°C) ( ∆VREF ∆VREF at 25°C ) x 100 ) x 106 ∆ TA ( ∆VREF ∆VREF at 25°C ∆ TA 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 IK (VREF) R2 Figure 2. Test Circuit for VKA = VREF Rev. 08/13/02 Figure 3. Test Circuit for VKA > VREF SPX1431 Precision Adjustable Shunt Regulator 3 Figure 4. Test Circuit for IKOFF © Copyright 2002 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS 150 2.53 125 VKA = VREF 0°C to 105°C VKA = VREF IK = 10mA 2.52 VREF Reference Voltage (V) IK Cathode Current (mA) 100 75 50 25 0 -25 -50 2.51 2.50 2.49 2.48 2.47 2.46 -75 -100 -2 -1 0 1 2 VKA Cathode Voltage (V) 2.45 -60 3 -30 0 30 60 90 120 TA Ambient Temperature (°C) Figure 6. Reference Voltage VS Ambient Tempetature Figure 5. High Current Operating Characteristics 800 VKA = VREF 0° to 105°C 700 IK Cathode Current (µA) IREF Reference Input Current (µA) 900 600 500 400 105°C 300 25°C 200 -0°C 100 0 3.0 R1 = 10kΩ R2 = ∞ IK = 10mA 2.5 2.0 1.5 1.0 0.5 -100 -200 -1.0 0 1.0 2.0 VKA Cathode Voltage (V) 0 -60 3.0 60 90 120 70 Noise Voltage nV√Hz -10 0°C ∆VREF (mV) 30 Figure 8. Reference Input Current VS Ambient Temperature 0 -20 25°C 75°C -30 125°C IKA = 10mA 60 50 40 30 20 -40 10 3 6 9 12 15 18 21 24 VKA = VREF IK = 10mA TA = 25°C 0 10 27 30 VKA Cathode Voltage (V) 100 1K 10K 100K f Frequency (Hz) Figure 10. Noise Voltage VS Frequency Figure 9. Reference Voltage Line Regulation VS Cathode Voltage and TAMBIENT Rev. 08/13/02 0 TA Ambient Temperature (°C) Figure 7. Low Current Operating Characteristics -50 0 -30 SPX1431 Precision Adjustable Shunt Regulator 4 © Copyright 2002 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS (continued) ZKA Dynamic Impedance (Ω) 0.150 0.125 /DIV 10.000dB 45.000deg REF LEVEL 60.000dB 0.0deg VKA = VREF IK = 1 to 100mA f≤1kHz MARKER 19 422 MAG (A/R) MARKER 19 422 PHASE (A/R) 611.000Hz -0.125dB 611.000Hz 46.717deg PHASE 0.100 0.075 0.050 0.025 GAIN 0.0 -60 -30 0 30 60 90 120 10 TA Free Air Temperature 100 1K 10K 100K START 10.000Hz 1M 10M STOP 50 000 000.000Hz Figure 12. Small Signal Gain and Phase VS Frequency; IK = 10mA, TA = 25°C Figure 11. Low Frequency Dynamic Output Impedance VS TAMBIENT VOUT VIN 230Ω 9µF 15kΩ IK VOUT VIN 8.25kΩ GND Figure 13. Test Circuit for Gain and Phase Frequency Response Figure 14. Frequency = 100kHz, IK = 10mA, TA = 25°C 100 VIN 90 250Ω 80 IK Cathode Current (mA) VOUT IK fp = 100kHz 50Ω A: VKA = VREF B: VKA= 5V at IK=10mA C: VKA=10V at IK=10mA D: VKA=15V at IK=10mA 70 C 60 50 40 STABLE STABLE A 30 20 10 TA = 25°C B D 0 100 GND 102 103 104 105 106 107 CL Load Capacitance (pF) Figure 16. Stability Boundary Conditions Figure 15. Test Circuit for Pulse Response Rev. 08/13/02 101 SPX1431 Precision Adjustable Shunt Regulator 5 © Copyright 2002 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS (continued) 100 150 Ω TA = 25 °C IK =1mA to 100mA IK ZKA - Dynamic 10 R CL 10kΩ 1.0 0.1 0.01 1K 10K 100K 1M 10M f - Frequency (Hz) Figure 18. Dynamic Output Impedance TA = 25°C, IK = 1 to 100mA Figure 17. Test Circuit for Stability IKOFF Cathode Current (nA) 100 R3 VIN VOUT 10 R1 0.1% VKA = 36V VREF = 0V 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 VOUT ISINK R3 R2 R1 0.1% Opto Isolator Q1 R3 sets feedback gain, C1 provides feedback compensation Isolated Feedback SPX1431 C1 C2 R1 0.1% + SPX1431 R2 0.1% VOUTRTN Figure 22. Reference Amplifier for Isolated Feedback in Off-Line DC-DC Converters Figure 21. Constant Current, Sink, ISINK = VREF/R1 Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator 6 © Copyright 2002 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN VIN VOUT R5 R1 0.1% R4 C1 R1 0.1% R3 R2 0.1% R3 VOUT SPX1431 Q1 SPX1431 R2 0.1% Figure 24. High Current Shunt Regulator VOUT = (1+R1/R2)VREF Figure 23. Precision High Current Series Regulator VOUT = (1+R1/R2)VREF VCC R2 VIN R1 * Resistor values are chosen such that the effect to IREF is negligible. VOUT SPX1431 Figure 25. Single Supply Comparator with Temperature Compensated Threshold. VIN threshold = 2.5V Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator 7 © Copyright 2002 Sipex Corporation PACKAGES SOT-23-5 (M5) 8-Pin Surface Mount (S) REF CATHODE 1 8 ANODE 2 7 ANODE ANODE 3 6 ANODE N/C 4 5 N/C REF ANODE 5 4 1 N/C 2 N/C SOT-89 (M1) TO-92 (N) 1 1 3 CATHODE REF 2 3 3 CATHODE ANODE REF CATHODE ANODE Top View Top View 2 Bottom View Top 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) 45 ° 0.37 (0.015) BSC 0.77 (0.030) 0.64 (0.025) 7 °(4 PLCS) 3 ° -6° 0.56 (0.022) 0.49 (0.019) 0.45 (0.018) 0.35 (0.014) Rev. 08/13/02 0.20 (0.008) 0.10 (0.004) SPX1431 Precision Adjustable Shunt Regulator 8 0.22 (0.009) 0.19 (0.007) 7 °(4 PLCS) © Copyright 2002 Sipex Corporation PACKAGE: 5 Lead SOT23 b C L e E e1 D C L a C L 0.20 DATUM 'A' A A2 C E1 A L 2 A1 A .10 MIN MAX A 0.90 1.45 A1 0.00 0.15 A2 0.90 1.30 b 0.25 0.50 C 0.09 0.20 D 2.80 3.10 E 2.60 3.00 E1 1.50 1.75 L 0.35 0.55 SYMBOL e 0.95ref e1 1.90ref a Rev. 08/13/02 0 O 10 O SPX1431 Precision Adjustable Shunt Regulator 9 © Copyright 2002 Sipex Corporation PACKAGE: 3 Lead SOT-89 C A C N P 2 1 3 K B F D G -T- STYLE 1 STYLE 3 PIN 1. BASE 2. COLLECTOR 3. EMITTER PIN 1. GATE 2. ANODE 3. CATHODE STYLE 2 STYLE 4 PIN 1. ANODE 2. CATHODE 3. NO CONNECTION PIN 1. DRAIN 2. GATE 3. SOURCE Rev. 08/13/02 DIM A B C D E F G J K L N P 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 SPX1431 Precision Adjustable Shunt Regulator 10 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 © Copyright 2002 Sipex Corporation PACKAGE: TO-92 0.090 (2.286) Radius typ. 2 1 3 0.145 (3.683) 0.135 (3.429) 0.055 (1.397) 0.045 (1.143) 10° typ. BOTTOM VIEW 0.085 (2.159) Diameter 0.185 (4.699) 0.045 (1.143) 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) 0.0155 (0.3937) 0.0145 (0.3683) 0.055 (1.397) 0.045 (1.143) 0.105 (2.667) 0.095 (2.413) Rev. 08/13/02 SPX1431 Precision Adjustable Shunt Regulator 11 © Copyright 2002 Sipex Corporation 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: [email protected] 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 12 © Copyright 2002 Sipex Corporation