SPX431L ® Precision Adjustable Shunt Regulator FEATURES ■ Tight Voltage Tolerance 0.5% at 10mA ■ Wide Operating Current 1mA to 100mA ■ Extended Temperature Range: 0°C to 105°C ■ Low Temperature Coefficient 30 ppm/°C ■ Improved Replacement in Performance for TL431 and AS431 ■ Low Cost Solution APPLICATIONS ■ Battery Operating Equipment ■ Adjustable Supplies ■ Switching Power Supplies ANODE SPX431L 3 Pin SOT-23 1 REF CATHODE Now Available in Lead Free Packaging ■ ■ ■ ■ Error Amplifiers Single Supply Amplifier Monitors / VCRs / TVs Personal Computers DESCRIPTION The SPX431L is a 3-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference. The SPX431L acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX431L’s thermal stability, wide operating current (100mA) and temperature range (0°C to 105°C) makes it suitable for a variety of applications that require a low cost, high performance solution. SPX431L tolerance of 0.5% 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 line and contribute a significant cost savings. The output voltage may be adjusted to any value between VREF and 20V with two external resistors. The SPX431L is available in TO-92, SOIC-8, SOT-89, and SOT-23-3 packages. BLOCK DIAGRAM Cathode (K) Reference (R) + 2.5V Anode (A) Date: 5/25/04 SPX431L Precision Adjustable Shunt Regulator 1 © Copyright 2004 Sipex Corporation5 ABSOLUTE MAXIMUM RATINGS Junction Temperature TJ ........................................................... 150 °C Storage Temperature TSTG .............................................. -65 to 150 °C Lead Temperature (Soldering 10 sec.) TL .................................. 300°C Cathode-Anode Reverse Breakdown VKA ....................................... 20V Anode-Cathode Forward Current, (<10ms) IAK ................................. 1A Operating Cathode Current IKA .................................................. 100mA Reference Input Current IREF ........................................................ 10mA Continuos Power Dissipation at 25°C PD TO-92 ..................................................................... 775mW SOT-23 .................................................................. 200 mW SOIC-8 .................................................................... 750mW SOT-89 ................................................................. 1000mW 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. RECOMMENDED CONDITIONS PARAMETER TYPICAL THERMAL RESISTANCES SYMBOL RATING UNIT Cathode Voltage VKA VREF to 20 V Cathode Current IK 10 mA PACKAGE 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 9.1 mW/°C 8°C/W 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 UNITS 2.490 2.503 2.515 V 0.07 0.20 mV/°C -1.0 -0.4 0.3 0.7 4.0 0.4 1.2 µA 0.4 1.0 mA SPX431LA Reference Voltage ∆VREF withTemp.* Ratio of Change in VREF to Cathode Voltage Reference Input Current VREF 2 TC 2 ∆ VREF ∆VK 3 VREF to 10V 10V to 20V -2.7 -2.0 mV/V IREF 3 IREF Temp Deviation ∆IREF 3 Min IK for Regulation IK(MIN) 2 Off State Leakage IK(OFF) 4 VREF = 0V, VKA = 20V 0.04 1.0 µA ZKA 2 ƒz ≤ 1kHz IK = 1 to 100mA 0.15 0.5 Ω VREF 2 2.495 2.520 V 0.07 0.20 mV/°C -1.0 -0.4 0.3 Dynamic Output Impedance TJ = 0°C to 105°C µA SPX431L Reference Voltage ∆VREF withTemp.* Ratio of Change in VREF to Cathode Voltage Reference Input Current TC 2 ∆ VREF ∆VK 3 IREF 3 ∆IREF 3 Min IK for Regulation IK(MIN) 2 Off State Leakage IK(OFF) ZKA IREF Temp Deviation Dynamic Output Impedance Date: 5/25/04 2.470 VREF to 10V 10V to 20V -2.7 -2.0 mV/V 0.7 4.0 µA TJ = 0°C to 105°C 0.4 1.2 µA 0.4 1.0 mA 4 VREF = 0V, VKA = 20V 0.04 1.0 µA 2 ƒz ≤ 1kHz IK = 1 to 100mA 0.15 0.5 Ω SPX431L Precision Adjustable Shunt Regulator 2 © Copyright 2004 Sipex Corporation5 ELECTRICAL CHARACTERISTICS Electrical characteristics at 25°C IK = 10mA VK = VREF, unless otherwise specified. PARAMETER SYMBOL FIGURE CONDITIONS MIN TYP MAX UNITS 2.445 2.495 2.545 V 0.07 0.20 mV/°C -1.0 -0.4 0.3 0.7 4.0 0.4 1.2 µA 0.4 1.0 mA SPX431LC Reference Voltage VREF 2 ∆VREF withTemp.* TC 2 ∆ VREF ∆VK 3 Ratio of Change in VREF to Cathode Voltage Reference Input Current VREF to 10V 10V to 20V -2.7 -2.0 mV/V IREF 3 IREF Temp Deviation ∆IREF 3 Min IK for Regulation IK(MIN) 2 Off State Leakage IK(OFF) 4 VREF = 0V, VKA = 16V 0.04 1.0 µA 2 ƒz ≤ 1kHz IK = 1 to 100mA 0.15 0.5 Ω Dynamic Output ZKA Impedance Operating Range (TJ) = 0°C to 105°C. * See appropiate test circuit (Figure 2) TJ = 0°C to 105°C µA 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 90 105 Junction Temperature (°C) • TC in ppm/°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. Date: 5/25/04 SPX431L Precision Adjustable Shunt Regulator 3 © Copyright 2004 Sipex Corporation5 TEST CIRCUITS VIN VIN VKA = VREF VIN VKA VKA IK (OFF) IREF R1 IK IK IREF (VREF) R2 Figure 2. Test Circuit for VKA = VREF Figure 3. Test Circuit for VKA > VREF Figure 4. Test Circuit for IKOFF TYPICAL PERFORMANCE CHARACTERISTICS 150 IK Cathode Current (mA) 100 2.53 VKA = VREF 0°C to 105°C 2.52 VREF Reference Voltage (V) 125 75 50 25 0 -25 -50 -1 0 1 2 VKA Cathode Voltage (V) 2.48 2.47 VKA = VREF 0° to 105°C 600 500 400 105°C 300 25°C 200 -0°C -30 0 30 60 90 120 Figure 6. Reference Voltage VS Ambient Tempetature IREF Reference Input Current (µA) IK Cathode Current (µA) 2.49 TA Ambient Temperature (°C) 900 700 2.50 2.45 -60 3 Figure 5. High Current Operating Characteristics 800 2.51 2.46 -75 -100 -2 VKA = VREF IK = 10mA 100 0 3.0 2.5 R1 = 10kΩ R2 = ∞ IK = 10mA 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 0 30 60 90 120 TA Ambient Temperature (°C) Figure 8. Reference Input Current VS Ambient Temperature. Figure 7. Low Current Operating Characteristics. Date: 5/25/04 -30 SPX431L Precision Adjustable Shunt Regulator 4 © Copyright 2004 Sipex Corporation5 TYPICAL PERFORMANCE CHARACTERISTICS 70 0 Noise Voltage nV/Hz 60 -10 ∆VREF (mV) 0°C -20 25°C 75°C -30 125°C IKA = 10mA 50 40 30 20 -40 10 -50 0 3 6 9 12 15 18 21 24 VKA = VREF IK = 10mA TA = 25°C 0 10 27 30 100 VKA Cathode Voltage (V) 0.150 ZKA Dynamic Impedance (Ω) 10K 100K Figure 10. Noise Voltage VS Frequency Figure 9. Reference Voltage Line Regulation VS Cathode Voltage and TAMBIENT 0.125 1K f Frecuency (Hz) REF LEVEL 60.000dB 0.0deg VKA = VREF IK = 1 to 100mA f≤1kHz /DIV 10.000dB 45.000deg MARKER 25 297 698.000 Hz MAG (A/R) -0.025 dB MARKER 25 297 698.000 Hz PHASE (A/R) 93.320 deg 60dB 215° 180° 50dB PHASE 0.100 0.075 40dB 135° 30dB 90° 20dB 45° 0° 10dB 0.050 GAIN 0.025 0.0 -60 0dB -45° -10dB -90° -20dB -135° -30dB -30 0 30 60 90 120 -180° -40dB 10 TA Free Air Temperature 100 1K START 10.000Hz 10K 100K 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 9µF 15kΩ IK 230Ω VOUT VIN 8.25kΩ GND Figure 13. Test Circuit for Gain and Phase Frequency Response Date: 5/25/04 Figure 14. FZ = 100kHz, IK = 10mA, TA = 25°C SPX431L Precision Adjustable Shunt Regulator 5 © Copyright 2004 Sipex Corporation5 TYPICAL PERFORMANCE CHARACTERISTICS 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 TA = 25°C 10 B D 0 100 GND 101 102 103 104 105 106 107 CL Load Capacitance (pF) Figure 16. Stability Boundry Conditions Figure 15. Test Circuit for Pulse Response 100 ZKA Dynamic Impedance (Ω) 150 Ω IK R CL 10kΩ TA = 25°C IK = 1 to 100mA 10 1.0 0.1 0.01 1K 10K 100K 1M 10M F Frecuency (Hz) Figure 18. Dynamic Output Impedance TA = 25°C, IK = 1 to 100mA Figure 17. Test Circuit for Stability IKOFF Cathode Current (nA) 100 VIN R3 VOUT 10 R1 0.1% VKA = 20V VREF = 0V 1 VREF SPX431L 0.1 R2 0.1% 0.01 -50 0 50 100 150 TA Ambient Temperature (°C) Figure 19. Off State Leakage Date: 5/25/04 Figure 20. Shunt Regulator VOUT = (1+R1/R2)VREF SPX431L Precision Adjustable Shunt Regulator 6 © Copyright 2004 Sipex Corporation5 TYPICAL PERFORMANCE CHARACTERISTICS VIN VOUT ISINK R3 R2 R1 0.1% Opto Isolator Q1 R3 sets feedback gain, C1 provides feedback compensation Isolated Feedback SPX431L C1 + C2 R1 0.1% SPX431L 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 VIN VIN VOUT R5 R1 0.1% R4 C1 R1 0.1% R3 R2 0.1% R3 VOUT SPX431L Q1 SPX431L 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 * Resistor values are chosen such that the effect to IREF is negligible. R2 VIN R1 VOUT SPX431L Figure 25. Single Supply Comparator with Temperature Compensated Threshold. VIN threshold = 2.5V. Date: 5/25/04 SPX431L Precision Adjustable Shunt Regulator 7 © Copyright 2004 Sipex Corporation5 PINOUTS 8-Pin SOIC (S) SOT-23-3 (M) TO-92 (N) SOT-89 (M1) 3 CATHODE 1 8 REF ANODE 2 7 ANODE ANODE 3 6 ANODE N/C 4 5 N/C 1 ANODE 1 1 2 REF CATHODE Top View REF 3 3 2 CATHODE REF ANODE CATHODE ANODE Top View Top View 2 Bottom View PACKAGE: 8 PIN NSOIC D e E/2 E1 E SEE VIEW C E1/2 1 b INDEX AREA (D/2 X E1/2) Ø1 A TOP VIEW Gauge Plane L2 Seating Plane Ø1 Ø L L1 VIEW C A2 A SEATING PLANE A1 SIDE VIEW DIMENSIONS Minimum/Maximum (mm) b WITH PLATING 8 Pin NSOIC (JEDEC MS-012, AA - VARIATION) COMMON HEIGHT DIMENSION SYMBOL A A1 A2 b c D E E1 e L L1 L2 Ø Ø1 Date: 5/25/04 MIN NOM MAX 1.75 1.35 0.25 0.10 1.25 1.65 0.31 0.51 0.17 0.25 4.90 BSC 6.00 BSC 3.90 BSC 1.27 BSC 0.40 1.27 1.04 REF 0.25 BSC 0º 8º 5º 15º c BASE METAL CONTACT AREA PACKAGE: 8 PIN NSOIC SPX431L Precision Adjustable Shunt Regulator 8 © Copyright 2004 Sipex Corporation5 PACKAGE: 3 PIN SOT-23 D b B 3 B E1 1 SEE VIEW C E VIEW A-A 2 e Gauge Plane e1 Seating Plane L Ø L1 VIEW C 3 PIN SOT-23 JEDEC TO-236 (AB) Variation Dimensions in (mm) A MIN A 0.89 A1 0.01 A2 NOM MAX - 1.12 - 0.88 0.95 1.02 0.30 - 0.50 c 0.08 - 0.20 2.80 2.90 e 0.95 BSC e1 1.90 BSC E 2.10 1.40 1.30 L 0.40 0.50 SIDE VIEW b c 0.60 0.54 REF L1 Ø C A1 WITH PLATING 2.64 1.20 A 3.04 - E1 Seating Plane 0.10 b D A2 A 0º - BASE METAL SECTION B-B 8º 3 PIN SOT-23 Date: 5/25/04 SPX431L Precision Adjustable Shunt Regulator 9 © Copyright 2004 Sipex Corporation5 PACKAGE: 3 PIN SOT-89 D D1 3 Ø1.0 H E 5º(2x) L 1 2 e e1 C Dimensions in (mm) 3 PIN SOT-89 MIN A b L 1.40 0.36 NOM MAX 1.50 0.42 0.80 - 1.60 8º(2x) 0.48 1.20 b1 0.41 0.47 0.53 C 0.38 0.40 0.43 D 4.40 4.50 4.60 D1 1.40 1.60 1.75 H 3.94 - 4.25 E 2.40 2.50 2.60 e 1.45 1.50 1.55 e1 2.90 3.00 3.10 Ro.15 b b1 b 3 PIN SOT-89 Date: 5/25/04 SPX431L Precision Adjustable Shunt Regulator 10 © Copyright 2004 Sipex Corporation5 PACKAGE: 3 PIN TO-92 L e1 e W D A b S1 3 PIN TO-92 SYMBOL A b E e e1 L R S1 W D a DIMENSIONS IN INCHES MIN NOM .170 .014 .130 .095 .045 .500 .085 .045 .016 .175 4º - MAX R .195 .020 .155 .105 .055 .610 .095 .060 0.022 E .195 6º a(2x) 3 PIN TO-92 Date: 5/25/04 SPX431L Precision Adjustable Shunt Regulator 11 © Copyright 2004 Sipex Corporation5 ORDERING INFORMATION PART NUMBER ACCURACY OUTPUT VOLTAGE PACKAGES SPX431LAM ........................ 0.5% .............. 2.503V ................................ 3-Pin SOT-23 SPX431LAM/TR .................. 0.5% .............. 2.503V ................................ 3-Pin SOT-23 SPX431LAM1 ...................... 0.5% .............. 2.503V ................................ 3-Pin SOT-89 SPX431LAM1/TR ................ 0.5% .............. 2.503V ................................ 3-Pin SOT-89 SPX431LAS ........................ 0.5% .............. 2.503V .................................. 8-Pin nSOIC SPX431LAS/TR ................... 0.5% .............. 2.503V .................................. 8-Pin nSOIC SPX431LAN ........................ 0.5% .............. 2.503V .................................. 3-Pin TO-92 SPX431LAN/TR .................. 0.5% .............. 2.503V .................................. 3-Pin TO-92 SPX431LM .......................... SPX431LM/TR .................... SPX431LM1 ........................ SPX431LM1/TR .................. SPX431LS ........................... SPX431LS/TR ..................... SPX431LN ........................... SPX431LN/TR ..................... 1.0% .............. 2.495V ................................ 3-Pin SOT-23 1.0% .............. 2.495V ................................ 3-Pin SOT-23 1.0% .............. 2.495V ................................ 3-Pin SOT-89 1.0% .............. 2.495V ................................ 3-Pin SOT-89 1.0% .............. 2.495V .................................. 8-Pin nSOIC 1.0% .............. 2.495V .................................. 8-Pin nSOIC 1.0% .............. 2.495V .................................. 3-Pin TO-92 1.0% .............. 2.495V .................................. 3-Pin TO-92 SPX431LCM ........................ SPX431LCM/TR .................. SPX431LCM1 ...................... SPX431LCM1/TR ................ SPX431LCS ........................ SPX431LCS/TR .................. SPX431LCN ........................ SPX431LCN/TR .................. 2.0% .............. 2.495V ................................ 3-Pin SOT-23 2.0% .............. 2.495V ................................ 3-Pin SOT-23 2.0% .............. 2.495V ................................ 3-Pin SOT-89 2.0% .............. 2.495V ................................ 3-Pin SOT-89 2.0% .............. 2.495V .................................. 8-Pin nSOIC 2.0% .............. 2.495V .................................. 8-Pin nSOIC 2.0% .............. 2.495V .................................. 3-Pin TO-92 2.0% .............. 2.495V .................................. 3-Pin TO-92 Available in lead free packaging. To order add “-L” suffix to part number. Example: SPX431LM/TR = standard; SPX431LM-L/TR = lead free /TR = Tape and Reel Pack quantity is 2,000 for TO-92, 2,500 for SOT-89, SOT-23, and SOT-23. Corporation ANALOG EXCELLENCE Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 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. Date: 5/25/04 SPX431L Precision Adjustable Shunt Regulator 12 © Copyright 2004 Sipex Corporation5