SPX2431LM

® SPX2431L Precision Adjustable Shunt Regulator FEATURES ■ Trimmed Bandgap to 0.5% and 1.0% ■ Wide Operating Current 160µA to 100mA ■ Extended Temperature Range: 0°C to 105°C ■ Low Temperature Coefficient 30 ppm/°C ■ Offered in TO-92, SOIC, SOT-23-3 ■ Replacement for TL431 and AS2431L ■ Low Cost Solution DESCRIPTION APPLICATIONS ■ Battery Operating Equipment ■ Adjustable Supplies ■ Switching Power Supplies ■ Error Amplifiers ■ Single Supply Amplifier ■ Monitors / VCRs / TVs ■ Personal Computers The SPX2431L is a 3-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference (0.5%) and extremely low operating current (100µA). The SPX2431L acts as an open-loop error amplifier with a 2.5V temperature compensated reference. The SPX2431L's thermal stability, wide operating current (100mA) and temperature range (0°C to 150°C) makes it suitable for a variety of applications. SPX2431LA 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 manufacturer's assembly lines and contributes a significant cost savings. In the standard shunt configuration, the combination of a low temperature coefficient, sharp turn on characteristics, low output impedance, and programmable output voltage makes this precision reference an excellent error amplifier. The SPX2431L is available in TO-92, SOIC-8, and SOT-23-3 package. BLOCK DIAGRAM Cathode (K) Reference (R) + 2.5V Anode (A) Rev. 08/13/02 SPX2431L Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 1 ABSOLUTE MAXIMUM RATINGS Cathode-Anode Reverse Breakdown VKA ....................................... 20V Anode-Cathode Forward Current, (25°. ELECTRICAL CHARACTERISTICS Electrical characteristics at 25°C IK = 10mA VK = VREF, unless otherwise specified. PARAMETER SYMBOL FIGURE CONDITIONS MIN TYP SPX2431LA 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 ∆ VK IREF ∆IREF IK(MIN) IK(OFF) ZKA 2 2 2 3 3 3 2 4 2 VREF = 0V, VKA = 20V ƒz ≤ 1kHz IK = 0.16 to 100mA 0.04 0.15 TJ = 0°C to 105°C VREF to 10V 10V to 20V -2.7 -2.0 TJ = 0°C to 150°C 2.490 2.469 2.503 0.07 -1.01 -0.4 0.7 0.4 2.515 2.536 0.20 0.3 4.0 1.2 160 500 0.5 0.04 0.15 -2.7 -2.0 2.470 2.449 MAX MIN TYP SPX2431 2.495 0.07 -1.01 -0.4 0.7 0.4 2.520 2.541 0.20 0.3 4.0 1.2 160 500 0.5 µA µA µA nA Ω V V mV/°C mV/V MAX UNITS Operating Range (TJ ) = -40°C to 125°C. * See appropiate test circuit (Figure 2) Rev. 08/13/02 SPX2431L 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 SPX2431L 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 270 VKA = VREF 0° to 105°C 210 IK Cathode Current (µA) 180 150 120 90 60 30 0 -30 -60 -1.0 IREF Reference Input Current (µA) 240 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 -10 0°C ∆VREF (mV) Noise Voltage nV/Hz 50 40 30 20 10 0 10 VKA = VREF IK = 10mA TA = 25°C 100 1K 10K 100K -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) f Frequency (Hz) Figure 9. Reference Voltage Line Regulation VS Cathode Voltage and TAMBIENT Rev. 08/13/02 Figure 10. Noise Voltage VS Frequency SPX2431L Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 4 TYPICAL PERFORMANCE CHARACTERISTICS (continued) 0.150 REF LEVEL 60.000dB 0.0deg 60dB 50dB PHASE /DIV 10.000dB 45.000deg MARKER 3 039 MAG (A/R) MARKER 3 039 PHASE (A/R) 642.400Hz 0.057dB 6642.400Hz 81.770deg 215° 180° 135° 90° 45° 0° -45° GAIN -90° -135° -180° -215° ZKA Dynamic Impedance (Ω) 0.125 0.100 0.075 0.050 VKA = VREF IK = 160µ to 100mA f≤1kHz 40dB 30dB 20dB 10dB 0dB 0.025 0.0 -60 -30 0 30 60 90 TA Free Air Temperature 120 -10dB -20dB -30dB -40dB 10 100 1K 10K 100K 1M 10M START 10.000Hz STOP 50 000 000.000Hz 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 9µ F 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 SPX2431L Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 5 TYPICAL PERFORMANCE CHARACTERISTICS (continued) 100 150 Ω IK R TA = 25 °C IK = 160µ 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 = 160µA to 100mA 100 VIN R3 VOUT IKOFF Cathode Current (nA) 10 VKA = 20V VREF = 0V 1 R1 0.1% VREF SPX2431L 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 SPX2431L C1 R1 0.1% C2 + SPX2431L 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 SPX2431L Precision Adjustable Shunt Regulator 6 TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN R5 R4 VIN VOUT R1 0.1% R3 C1 SPX2431L R1 0.1% R2 0.1% R3 VOUT R2 0.1% SPX2431L 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 SPX2431L Figure 25. Single Supply Comparator with Temperature Compensated Threshold. VIN threshold = 2.5V Rev. 08/13/02 SPX2431L Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 7 PACKAGES 8-Pin Surface Mount (S) CATHODE ANODE ANODE N/C 1 2 3 4 8 7 6 5 REF 3 SOT-23-3 (M) ANODE TO-92 (N) 1 2 3 ANODE ANODE N/C 1 2 REF CATHODE REF ANODE CATHODE 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 SPX2431L Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 8 PACKAGE: SOT23-3 (M) ANODE 3 1 2 REF CATHODE Top View 0.015 - 0.018 (0.381 - 0.457) 0.047 - 0.055 (1.194 - 1.397) 0.083 - 0.098 (2.108 - 2.489) 0.035 - 0.040 (0.889 - 1.016) 0.020 - 0.024 (0.508 - 0.610) 0.070 - 0.080 (1.778 - 2.032) 0.110 - 0.120 (2.794 - 3.048) 0.003 - 0.005 (0.076 - 0.127) 0.001 - 0.004 (0.025 - 0.102) 0.030 - 0.041 (0.762 - 1.041) 0.018 - 0.024 (0.457 - 0.610) Rev. 08/13/02 SPX2431L Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 9 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 SPX2431L Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 10 ORDERING INFORMATION PART NUMBER SPX2431LAM ...................... SPX2431LAS ...................... SPX2431LAN ...................... ACC OUTPUT VOLTAGE PACKAGES 0.5% .............. 2.503V ................................ 3-Pin SOT-23 0.5% .............. 2.503V .................................... 8-Pin SOIC 0.5% .............. 2.503V .................................. 3-Pin TO-92 SPX2431LM ........................ 1.0% .............. 2.495V ................................ 3-Pin SOT-23 SPX2431LS ......................... 1.0% .............. 2.495V .................................... 8-Pin SOIC SPX2431LN ......................... 1.0% .............. 2.495V .................................. 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 SPX2431L Precision Adjustable Shunt Regulator © Copyright 2002 Sipex Corporation 11