SPX1431_07

SPX1431 Precision Adjustable Shunt Regulator FEATURES ■ Trimmed Bandgap Reference to 0.4% CATHODE 1 8 REF ■ Wide Operating Current 1mA to 150mA SPX1431 7 ANODE ANODE 2 ■ Extended Temperature Range: 8 Pin nSOIC -55°C to 125°C ANODE 3 6 ANODE ■ Low Temperature Coefficient 30 ppm/°C N/C 4 5 N/C Available in Lead Free Packaging ■ Offered in TO-92, SOIC, SOT-89, SOT-23-5 ■ Improved Replacement in Performance for Now Available in Lead Free Packaging LT1431 ■ Low Cost Solution APPLICATIONS ■ Error Amplifiers ■ Battery Operating Equipment ■ Single Supply Amplifier ■ Adjustable Supplies ■ Monitors / VCRs / TVs ■ Switching Power Supplies ■ 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) Mar3-07 SPX43 Precision Adjustable Shunt Regulator © 2007 Sipex Corporation  ABSOLUTE MAXIMUM RATINGS Cathode-Anode Reverse Breakdown VKA ....................................... 37V Anode-Cathode Forward Current, (25°C. ELECTRICAL CHARACTERISTICS Electrical characteristics at 25°C IK= 10mA V K= V REF, unless otherwise specified. PARAMETER SPX1431 Reference Voltage VREFwithTemp.* Ratio of Change in VREF to Cathode Voltage Reference Input Current IREFTemp Deviation Min IKfor Regulation Off State Leakage Dynamic Output Impedance VREF TC VREF VK IREF IREF I K(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 SYMBOL FIGURE CONDITIONS MIN TYP MAX UNITS Operating Range (TJ ) = - 55°C to 125°C. * See appropiate test circuit (Figure 2) Mar3-07 SPX43 Precision Adjustable Shunt Regulator © 2007 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. VREFVS Temperature. TEST CIRCUITS VIN VKA= VREF VIN VKA VIN VKA IREF IK R1 (VREF) R2 IK (OFF) IREF IK Figure 2. Test Circuit for VKA= V REF Figure 3. Test Circuit for VKA> V REF Figure 4. Test Circuit for IKOFF Mar3-07 SPX43 Precision Adjustable Shunt Regulator © 2007 Sipex Corporation 3 TYPICAL PERFORMANCE CHARACTERISTICS 150 125 100 IK Cathode Current (mA) VKA= V REF 0°C to 105°C 2.53 2.52 VREF Reference Voltage (V) VKA= V REF IK= 10mA 75 50 25 0 -25 -50 -75 -100 -2 -1 0 1 2 VKA Cathode Voltage (V) 3 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 900 700 IK Cathode Current (µA) VKA= V REF 0°to 105 °C IREF Reference Input Current (µA) 800 600 500 400 300 200 100 0 -100 -200 -1.0 3.0 2.5 2.0 1.5 1.0 0.5 0 -60 R1 = 10k 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 70 60 50 40 30 20 10 0 10 VKA= V REF IK= 10mA TA= 25 °C 100 1K 10K 100K 0 -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 VKACathode Voltage (V) Noise Voltage nV Hz f Frequency (Hz) Figure 9. Reference Voltage Line Regulation VS Cathode Voltage and TAMBIENT Mar3-07 Figure 10. Noise Voltage VS Frequency SPX43 Precision Adjustable Shunt Regulator © 2007 Sipex Corporation 4 TYPICAL PERFORMANCE CHARACTERISTICS 0.150 ZKA Dynamic Impedance ( ) VKA= V REF IK= 1 to 100mA f 1kHz 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 0.125 0.100 0.075 0.050 0.025 0.0 -60 PHASE GAIN -30 0 30 60 90 120 TAFree Air Temperature 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, T A= 25 °C VOUT 15k IK 230 VIN 9µ F VOUT VIN 8.25k GND Figure 13. Test Circuit for Gain and Phase Frequency Response Figure 14. Frequency = 100kHz, IK = 10mA, TA= 25 °C VIN 250 IK Cathode Current (mA) 100 90 A: VKA= V REF B: VKA= 5V at IK=10mA C: VKA=10V at IK=10mA D: VKA=15V at IK=10mA C VOUT IK fp = 100kHz 50 80 70 60 50 40 STABLE 30 20 10 TA = 25°C B A STABLE GND Figure 15. Test Circuit for Pulse Response Mar3-07 0 100 D 101 102 103 104 105 106 107 CL Load Capacitance (pF) Figure 16. Stability Boundary Conditions © 2007 Sipex Corporation SPX43 Precision Adjustable Shunt Regulator  TYPICAL PERFORMANCE CHARACTERISTICS 150 IK 100 TA = 25 °C IK = 1mA to 100mA ZKA - Dynamic R 10 CL 1.0 10k 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 VOUT R3 Q1 Isolated Feedback Opto Isolator R1 0.1% R3 sets feedback gain, C1 provides feedback compensation SPX1431 R1 0.1% C2 + SPX1431 C1 R2 0.1% VOUTRTN Figure 21. Constant Current, Sink, ISINK= V REF/R1 Mar3-07 Figure 22. Reference Amplifier for Isolated Feedback in Off-Line DC-DC Converters © 2007 Sipex Corporation SPX43 Precision Adjustable Shunt Regulator  TYPICAL PERFORMANCE CHARACTERISTICS 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)V REF Figure 24. High Current Shunt Regulator VOUT= (1+R1/R2)V REF VCC R2 * Resistor values are chosen such that the effect to IREFis negligible . VOUT VIN R1 SPX1431 Figure 25. Single Supply Comparator with Temperature Compensated Threshold. VINthreshold = 2.5V PACKAGE PINOUTS 8-Pin Surface Mount (S) SOT-23-5 (M5) REF CATHODE ANODE ANODE N/C 1 2 3 4 8 7 6 5 REF ANODE ANODE N/C 5 1 N/C 2 ANODE 4 3 1 REF 2 3 CATHODE REF CATHODE 1 2 3 SOT-89 (M1) TO-92 (N) N/C CATHODE ANODE ANODE Top View Top View Mar3-07 Top View Bottom View SPX43 Precision Adjustable Shunt Regulator © 2007 Sipex Corporation 7 Package: 8 Pin nSOic Mar3-07 SPX43 Precision Adjustable Shunt Regulator © 2007 Sipex Corporation  Package: 5 Pin SOT-23 Mar3-07 SPX43 Precision Adjustable Shunt Regulator © 2007 Sipex Corporation  Package: 3 Pin SOT-89 Mar3-07 SPX43 Precision Adjustable Shunt Regulator © 2007 Sipex Corporation 0 Package: 3 Pin TO-92 Mar3-07 SPX43 Precision Adjustable Shunt Regulator © 2007 Sipex Corporation  ORDeRing inFORMaTiOn Part number SPX43M SPX43M/TR SPX43M-L SPX43M-L/TR SPX43M SPX43M/TR SPX43M-L SPX43M-L/TR SPX43N SPX43N/TR SPX43N-L SPX43N-L/TR SPX43S SPX43S/TR SPX43S-L SPX43S-L/TR Package RoHS Status code SOT--3 SOT--3 SOT--3 SOT--3 SOT-23- SOT-23- SOT-23- SOT-23- TO-2 TO-2 TO-2 TO-2 NSOIC NSOIC NSOIC NSOIC ▪ ▪ Active Active Active Active EOL EOL EOL EOL EOL OBS EOL EOL EOL EOL EOL EOL Pack Quantity Bulk 200 Tape & Reel Bulk 200 Tape & Reel Bulk 200 Tape & Reel Bulk 200 Tape & Reel Bulk 2000 Tape & Reel Bulk 2000 Tape & Reel Bulk 200 Tape & Reel Bulk 200 Tape & Reel ▪ ▪ ▪ ▪ ▪ ▪ Solved by Sipex corporation TM Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 03 TEL: (40) 34-700 FAX: (40) 3-700 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 herein; neither does it convey any license under its patent rights nor the rights of others. Mar3-07 SPX43 Precision Adjustable Shunt Regulator © 2007 Sipex Corporation 2