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 APPLICATIONS ■ Battery Operating Equipment ■ Adjustable Supplies ■ Switching Power Supplies ■ Error Amplifiers ■ Single Supply Amplifier ■ Monitors / VCRs / TVs ■ Personal Computers DESCRIPTION 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 1 © Copyright 2002 Sipex Corporation ABSOLUTE MAXIMUM RATINGS RECOMMENDED CONDITIONS Cathode-Anode Reverse Breakdown VKA ....................................... 20V Anode-Cathode Forward Current, (<10ms) IAK ................................. 1A Operating Cathode Current IKA .................................................. 100mA Reference Input Current IREF ....................................................... 1.0mA Continuos Power Dissipation at 25°C PD TO-92 ..................................................................... 775mW SOT-23 .................................................................. 200 mW SOIC-8 .................................................................... 750mW PARAMETER Junction Temperature TJ ........................................................... 150 °C Storage Temperature TSTG .............................................. -65 to 150 °C Lead Temperature (Soldering 10 sec.) TL .................................. 300°C SYMBOL RATING Cathode Voltage VKA VREF to 20 UNIT V Cathode Current IK 10 mA TYPICAL THERMAL RESISTANCES 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 Typical deratings of the thermal resistances are given for ambient temperature >25°. ELECTRICAL CHARACTERISTICS Electrical characteristics at 25°C IK = 10mA VK = VREF, unless otherwise specified. PARAMETER SYMBOL FIGURE CONDITIONS MIN TYP MAX MIN SPX2431LA Reference Voltage ∆VREF withTemp.* Ratio of Change in VREF to Cathode Voltage VREF TC 2 2 2.490 2.469 2.503 2.515 2.536 0.07 0.20 -2.7 -2.0 -1.01 -0.4 2 ∆ 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) ZKA Dynamic Output Impedance TJ = 0°C to 150°C VREF to 10V 10V to 20V TYP MAX UNITS SPX2431 0.3 2.470 2.449 2.495 2.520 2.541 V V 0.07 0.20 mV/°C -2.7 -2.0 -1.01 -0.4 0.3 mV/V 0.7 4.0 0.7 4.0 µA TJ = 0°C to 105°C 0.4 1.2 0.4 1.2 µA 160 µA 4 VREF = 0V, VKA = 20V 0.04 500 0.04 500 nA 2 ƒz ≤ 1kHz IK = 0.16 to 100mA 0.15 0.5 0.15 0.5 Ω 160 Operating Range (TJ ) = -40°C to 125°C. * See appropiate test circuit (Figure 2) Rev. 08/13/02 SPX2431L 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 SPX2431L 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 240 VKA = VREF 0° to 105°C 210 IK Cathode Current (µA) IREF Reference Input Current (µA) 270 180 150 120 105°C 90 25°C 60 -0°C 30 0 3.0 R1 = 10kΩ R2 = ∞ IK = 10mA 2.5 2.0 1.5 1.0 0.5 -30 -60 -1.0 0 1.0 2.0 VKA Cathode Voltage (V) 0 -60 3.0 -30 0 30 60 90 120 TA Ambient Temperature (°C) Figure 8. Reference Input Current VS Ambient Temperature Figure 7. Low Current Operating Characteristics 70 0 Noise Voltage nV/Hz 60 -10 ∆VREF (mV) 0°C -20 25°C 75°C -30 125°C IKA = 10mA 40 30 20 -40 -50 0 50 10 3 6 9 12 15 18 21 24 VKA = VREF IK = 10mA TA = 25°C 0 10 27 30 VKA Cathode Voltage (V) 1K 10K 100K f Frequency (Hz) Figure 10. Noise Voltage VS Frequency Figure 9. Reference Voltage Line Regulation VS Cathode Voltage and TAMBIENT Rev. 08/13/02 100 SPX2431L 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 = 160µ to 100mA f≤1kHz MARKER 3 039 MAG (A/R) MARKER 3 039 PHASE (A/R) 642.400Hz 0.057dB 6642.400Hz 81.770deg 60dB 215° 180° 50dB PHASE 0.100 0.075 40dB 135° 30dB 90° 20dB 45° 10dB 0° 0.050 -45° 0dB GAIN 0.025 0.0 -60 -30 0 30 60 90 TA Free Air Temperature 120 -10dB -90° -20dB -135° -30dB -180° -40dB 10 100 1K 10K 100K START 10.000Hz 1M 10M -215° 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 SPX2431L Precision Adjustable Shunt Regulator 5 © Copyright 2002 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS (continued) 100 TA = 25 °C IK =160µ to 100mA 150 Ω 10 ZKA - Dynamic IK 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 = 160µA to 100mA Figure 17. Test Circuit for Stability IKOFF Cathode Current (nA) 100 R3 VIN VOUT 10 R1 0.1% VKA = 20V VREF = 0V 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 VOUT ISINK R3 R2 R1 0.1% Opto Isolator Q1 R3 sets feedback gain, C1 provides feedback compensation Isolated Feedback SPX2431L C1 C2 R1 0.1% + SPX2431L 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 SPX2431L 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 SPX2431L Q1 SPX2431L 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 SPX2431L Figure 25. Single Supply Comparator with Temperature Compensated Threshold. VIN threshold = 2.5V Rev. 08/13/02 SPX2431L Precision Adjustable Shunt Regulator 7 © Copyright 2002 Sipex Corporation PACKAGES SOT-23-3 (M) 8-Pin Surface Mount (S) TO-92 (N) ANODE CATHODE 1 8 REF ANODE 2 7 ANODE ANODE 3 6 ANODE N/C 4 5 N/C 1 3 1 2 REF CATHODE 3 REF CATHODE ANODE Bottom View Top View Top View 2 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) 0.22 (0.009) 0.19 (0.007) SPX2431L Precision Adjustable Shunt Regulator 8 7 °(4 PLCS) © Copyright 2002 Sipex Corporation PACKAGE: SOT23-3 (M) ANODE 3 1 REF 2 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) 0.001 - 0.004 (0.025 - 0.102) Rev. 08/13/02 0.003 - 0.005 (0.076 - 0.127) 0.030 - 0.041 (0.762 - 1.041) SPX2431L Precision Adjustable Shunt Regulator 9 0.018 - 0.024 (0.457 - 0.610) © 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 0.185 (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) 0.0155 (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 SPX2431L Precision Adjustable Shunt Regulator 10 © Copyright 2002 Sipex Corporation 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: [email protected] 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 11 © Copyright 2002 Sipex Corporation