TL431 / TL431A / TL431B ® TM Precision programmable References P RODUCTION D ATA S HEET INITIAL VOLTAGE REFERENCE ACCURACY OF 0.4% (TL431B) SINK CURRENT CAPABILITY 1mA to 100mA TYPICAL OUTPUT DYNAMIC IMPEDANCE LESS THAN 200mΩ; TYPICAL OUTPUT IMPEDANCE OF THE TL431B LESS THAN 100mΩ ADJUSTABLE OUTPUT VOLTAGE FROM 2.5V TO 36V AVAILABLE IN SURFACE-MOUNT PACKAGES LOW OUTPUT NOISE TYPICAL EQUIVALENT FULL RANGE TEMPERATURE COEFFICIENT OF 30ppm/°C DIRECT PIN-TO-PIN REPLACEMENT FOR INDUSTRY STANDARD TL431 AND TL1431 SI GN S regulation. The typical output impedance of these devices is 200mΩ. These devices find application in the feedback path of switching power supplies, OVP crowbar circuits, reference for A/D, D/A, and as zener diodes with improved turn-on characteristics. FO O R DU NE C W T DE The TL431/TL431A/TL431B series precision adjustable three terminal shunt voltage regulators are pin-to-pin compatible with the industry standard TL431. The output voltage of this reference is programmable by using two external resistors from 2.5V to 36V. These devices offer low output impedance for improved load PR IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com WWW . Microsemi .C OM KEY FEATURES DESCRIPTION PRODUCT HIGHLIGHT Precision Programmable References EC S OM OL ME ET ND E ED VIN VOUT R1 TL431/A & TL431B -40 to 85 2% 1% 0.4% 2% 1% 0.4% ⎛ ⎝ VO = ⎜ 1+ R1 ⎞ ⎟ •VREF R2 ⎠ PACKAGE ORDER INFO DM Plastic SOIC 8-Pin LP Plastic TO-92 3-Pin PK Plastic TO-89 3 - Pin RoHS Compliant / Pb-free Transition DC: 0440 RoHS Compliant / Pb-free Transition DC: 0509 RoHS Compliant / Pb-free Transition DC: 0518 TL431CDM TL431ACDM TL431BCDM TL431IDM TL431AIDM TL431BIDM TL431CLP TL431ACLP TL431BCLP TL431ILP TL431AILP TL431BILP TL431CPK TL431ACPK TL431BCPK TL431IPK TL431AIPK TL461BIPK TL431X 0 to 70 Initial Tolerance NO TA (°C) T O R B R2 Note: All surface mount packages are available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LTL431AIDM-TR). The TO-92 (LP) package is available in ammo-pack. Copyright © 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 TL431 / TL431A / TL431B ® TM Precision programmable References P RODUCTION D ATA S HEET PACKAGE PIN OUT DM Plastic SOIC 8-Pin THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA PK Plastic TO-89 3-Pin THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA LP EC S OM OL ME ET ND E ED Plastic TO-92 3-Pin THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA (Top View) Cathode 1 8 Ref N.C. 2 7 Anode Anode 3 6 Anode N.C. 4 5 N.C. DM PACKAGE (Top View) 165°C/W PR THERMAL DATA 1. Ref LP PACKAGE FO O R DU NE C W T DE Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal. Note 2. Voltage values are with respect to the anode terminal unless otherwise noted. 3. Cathode 2. Anode WWW . Microsemi .C OM Cathode to Anode Voltage (VKA)(Note 2) ....................................................... -0.3 to 37V Reference Input Current (IREF).................................................................. -50µA to 10mA Continuous Cathode Current (IK) .......................................................... -100mA to 150mA Operating Junction Temperature................................................................................ 150°C Storage Temperature Range.........................................................................-65°C to 150°C Package Peak Temp. for Solder Reflow (40 seconds maximum exposure) ... 260°C (+0 -5) SI GN S ABSOLUTE MAXIMUM RATINGS 3 Cathode 2 Anode 1 Ref 71°C/W 156°C/W PK PACKAGE (Top View) RoHS / Pb-free 100% Matte Tin Lead Finish Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. BLOCK DIAGRAM NO PACKAGE DATA T Ref (R) O R B Cathode (K) VREF Anode (A) Copyright © 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 TL431 / TL431A / TL431B ® TM Precision programmable References P RODUCTION D ATA S HEET ΔVREF ΔVKA IREF IMIN IOFF I ZKA I Dynamic Impedance TL431B IK = 10mA, VKA = VREF, TA = 25°C IK = 10mA, VKA = VREF, TA = 25°C IK = 10mA, VKA = VREF, TA = 25°C IK = 10mA, VKA = VREF IK = 10mA, VKA = VREF IK = 10mA, VKA = VREF IK = 10mA, VKA = VREF IK = 10mA, VKA = VREF IK = 10mA, VKA = VREF Min 2440 2470 2490 2495 2495 2500 4 5 4 5 4 5 2550 2520 2510 17 30 17 30 15 20 IK = 10mA, VKA = 2.5V to 36V -1.4 -2.7 IK = 10mA, VKA = 2.5V to 36V -1.1 -2.0 2 4 1.5 0.4 0.1 0.1 0.18 1.9 1 1 1 2 0.5 0.2 0.5 0.1 0.2 VKA = VREF, TA = 25°C VKA = VREF, TA = 25°C VKA = VREF to 36V VKA = VREF to 36V, TA= 25°C VKA = VREF to 36V, TA= 25°C VKA = VREF to 36V, TA= Operating Range VKA = 36V, VREF = 0V, TA= 25°C VKA = VREF, IK = 1mA to 100mA, f < 1kHz, TA = 25°C VKA = VREF, IK = 1mA to 100mA, f < 1kHz, TA = 25°C EC S OM OL ME ET ND E ED TL431 VREF TL431/A/B Typ Max SI GN S TL431 TL431A TL431B TL431C TL431I TL431AC Reference Drift TL431AI TL431BC TL431BI TL431, Voltage Ratio, Ref to TL431A Cathode (Note 4) TL431B TL431, Reference Input TL431A Current TL431B Minimum Operating Current TL431 TL431A Off-State Cathode Current TL431B Reference Input Voltage Test Conditions FO O R DU NE C W T DE Symbol PR Parameter Units mV mV WWW . Microsemi .C OM ELECTRICAL CHARACTERISTICS Unless otherwise specified, these specifications apply over the operating ambient temperature for the TL431C/TL431AC/TL431BC with 0°C < TA < 70°C, and TL431I/TL431AI/TL431BI with -40°C < TA < 85°C mV/V µA mA µA Ω Note 3: These parameters are guaranteed by design. Note 4: ΔVREF Ratio of change in reference input voltage to the change in cathode voltage. Copyright © 1999 Rev. 1.4, 2006-09-26 ELECTRICALS NO T O R B ΔVKA Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 TL431 / TL431A / TL431B ® TM Precision programmable References P RODUCTION D ATA S HEET GRAPH / CURVE INDEX FIGURE INDEX SI GN S Parameter Measurement Information Figure # 8. Test Circuit For VKA = VREF 9. Test Circuit For VKA > VREF 10. Test Circuit for IOFF FO O R DU NE C W T DE Typical Characteristics Figure # 11. Equivalent Input Noise Voltage Over a 10-Second Period 12. Small-Signal Voltage Amplification vs. Frequency 13. Reference Impedance vs. Frequency 14. Pulse Response 15. Stability Boundary Conditions WWW . Microsemi .C OM Characteristic Curves Figure # 1. Reference Input Voltage vs. Free-Air Temperature 2. Reference INput Current vs. Free-Air Temperature 3. Cathode Current vs. Cathode Voltage 4. Cathode Current vs. Cathode Voltage 5. Off-State Cathode Current vs. Free-Air Temperature 6. Ratio of Delta Reference Voltage to Delta Cathode Voltage vs. Free-Air Temperature 7. Equivalent Input Noise Voltage vs. Frequency Copyright © 1999 Rev. 1.4, 2006-09-26 CHARTS NO T O R B EC S OM OL ME ET ND E ED PR Application Information Figure # 16. Shunt Regulator 17. Single-Supply Comparator with TemperatureCompensated Threshold 18. High Current Shunt Regulator 19. Crowbar Circuit 20. Voltage Monitor 21. Precision Constant-Current Sink Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 TL431 / TL431A / TL431B ® TM Precision programmable References P RODUCTION D ATA S HEET CHARACTERISTIC CURVES 2.60 TL431/A 2.54 2.52 TL431B 2.50 2.48 VREF= 2495mV TL431/A 2.46 2.44 VREF= 2440mV TL431/A 2.4 -50 -25 0 25 50 75 100 3 TL431/A 2 TL431B 1 PR 2.42 4 (TA ) Ambient Temperature - (°C) Figure 1 – Reference Voltage vs. Free-Air Temperature 125 SI GN S VREF= 2550mV 2.56 IK = 10mA R1 = IK = 10mA FO O R DU NE C W T DE (VREF) Reference Input Voltage - (V) (IREF) Reference Input Current - (µA) VREF= V KA IK = 10mA 2.58 WWW . Microsemi .C OM 5 0 -50 -25 0 25 50 75 100 125 (TA ) Ambient Temperature - (°C) 150 VKA = V REF TA = 25 °C 100 75 O R B 50 25 0 TL431/A -25 TL431B -50 800 VKA = V REF TA = 25 °C 600 IMIN 400 200 0 T (IK) Cathode Current - (µA) 125 (IK) Cathode Current - (µA) EC S OM OL ME ET ND E ED Figure 2 – Reference Current vs. Free-Air Temperature -100 -1 0 1 -200 23 -1 (VKA ) Cathode Voltage - (V) Figure 3 – Cathode Current vs. Cathode Voltage Copyright © 1999 Rev. 1.4, 2006-09-26 0 1 CHARTS -2 NO -75 23 (VKA ) Cathode Voltage - (V) Figure 4 – Cathode Current vs. Cathode Voltage Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 TL431 / TL431A / TL431B ® TM Precision programmable References P RODUCTION D ATA S HEET CHARACTERISTIC CURVES TL431/A & TL431B VKA = 3V to 36V -0.95 1 SI GN S 1.5 -1.05 FO O R DU NE C W T DE VKA - (mV/V) 2 VREF / (IOFF) Off-State Cathode Current - (µA) VKA = 36V VREF= 0 WWW . Microsemi .C OM -0.85 2.5 -1.15 -1.25 -1.35 0.5 -25 0 25 50 75 100 PR -1.45 0 -50 125 -50 -25 0 25 50 75 100 125 (TA ) Ambient Temperature - (°C) Figure 6 – Ratio of Delta Reference Voltage to Delta Cathode Voltage vs. Free-Air Temperature Figure 5 – Off-State Cathode Current vs Free-Air Temperature EC S OM OL ME ET ND E ED (TA ) Ambient Temperature - (°C) 260 IO = 10mA TA = 25 °C 220 O R B 200 180 160 140 T 120 100 100 1k 10k 100k CHARTS 10 NO (VN) Noise Voltage - (nV/ Hz) 240 (f) Frequency - (Hz) Figure 7 – Equivalent Input Noise Voltage vs. Frequency Copyright © 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 TL431 / TL431A / TL431B ® TM Precision programmable References P RODUCTION D ATA S HEET PARAMETER MEASUREMENT INFORMATION VKA Input IK R1 FO O R DU NE C W T DE IREF R2 VREF Figure 8 – Test Circuit for VKA = VREF PR EC S OM OL ME ET ND E ED IOFF VREF Figure 9 – Test Circuit for VKA > VREF VKA Input SI GN S IK WWW . Microsemi .C OM VKA Input NO APPLICATIONS T O R B Figure 10 – Test Circuit for IOFF Copyright © 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 TL431 / TL431A / TL431B ® TM Precision programmable References P RODUCTION D ATA S HEET TYPICAL CHARACTERISTICS WWW . Microsemi .C OM f = 0.1 to 10Hz IK = 10mA TA = 25 °C 4 3 1 0 -1 -2 -3 -4 -5 -6 2 4 10 68 EC S OM OL ME ET ND E ED 0 FO O R DU NE C W T DE 2 PR (VN) Input Noise Voltage - (µV) 5 SI GN S 6 (t) Time - (s) Figure 11 – Equivalent Input Noise Voltage over a 10 – Second Period 19.1V 500µF 910 O R B 1k 2000 µF TL431/A & TL431B (DUT) VCC VCC 1µF TLE2027 A V = 10V/mV 820 T 1µF 160K NO 2.2µF 16k APPLICATIONS 16 TLE2027 16k 33k A V = 2V/V 1M CRO 33k 0.1µF VEE VEE Test Circuit for 0.1Hz to 10Hz Equivalent Input Noise Voltage Copyright © 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 TL431 / TL431A / TL431B ® TM Precision programmable References P RODUCTION D ATA S HEET TYPICAL CHARACTERISTICS 50 IK 15k 9µF 30 20 230 FO O R DU NE C W T DE 40 8.25k 10 0 -10 10k 1k 1M 100k 10M (f) Fre quency - (Hz) EC S OM OL ME ET ND E ED Figure 12 – Reference Impedance vs. Frequency 100 IK = 1mA to 100mA TA = 25 °C O R B 10 1 GND Test Circuit for Voltage Amplification Output 1k IK 50 0.1 10k 100k GND 1M 10M CHARTS 1k NO T (IzKAI) Reference Impedance SI GN S Output PR (AY) Voltage Amplification - (dB) IK = 10mA TA = 25 °C 60 WWW . Microsemi .C OM 70 Test Circuit for Reference Impedance (f) Frequency - (Hz) Figure 13 – Reference Impedance vs. Frequency Copyright © 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9 TL431 / TL431A / TL431B ® TM Precision programmable References P RODUCTION D ATA S HEET TYPICAL CHARACTERISTICS 5 220 3 Pulse Generator f = 100kHz 1 0 3 2 1 0 13 05 2 4 6 (t) Time - (µs) A V KA = V REF B V KA = 5V C V KA = 10V D V KA = 15V 90 80 B* O R B 10 T 40 30 150 CL R2 C* 20 50 NO 0.1 150 IK 1 10 CL CHARTS 0.01 VBATT Test Circuit for Curve A D* 0 0.001 IK R1=10k Stable Stable A* GND Test Circuit for Pulse Response IK = 10mA TA = 25 °C 70 60 EC S OM OL ME ET ND E ED Figure 14 – Pulse Response 100 50 PR (VKA) Output Voltage - (V) FO O R DU NE C W T DE 2 (IK) Cathode Current - mA Ou tput SI GN S VIN - (V) 4 VBATT (CL) Load Capacitance - (µF) Figure 15 – Stability Boundary Conditions *The areas under the curves represent conditions that may cause the device to oscillate. For curves B, C, and D, R2 and V+ were adjusted to establish the initial VKA and IK conditions with CL = 0. VBATT and CL were then adjusted to determine the ranges of stability. Test Circuit for Curve B, C, D Copyright © 1999 Rev. 1.4, 2006-09-26 WWW . Microsemi .C OM 6 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 10 TL431 / TL431A / TL431B ® TM Precision programmable References P RODUCTION D ATA S HEET APPLICATION INFORMATION R (see Note) VBATT VO IK TL431/A & TL431B TL431/A & TL431B VREF R2 0.1% Input R1 ⎞ ⎟ • VREF R2 ⎠ Figure 16 – Shunt Regulator Note: R should provide > 1mA cathode current to the TL431/A & TL1431 at minimum VBATT VO EC S OM OL ME ET ND E ED R1 TL431/A & TL431B R2 ⎛ ⎝ VO = ⎜ 1 + R1 ⎞ ⎟ • VREF R2 ⎠ Figure 18 – High Current Shunt Regulator VO VON 2V VOFF VBATT GND Figure 17 – Single-Supply Comparator with TemperatureCompensated Threshold PR VBATT FO O R DU NE C W T DE ⎛ ⎝ VBATT VO R1 TL431/A & TL431B C (see Note) R2 Figure 19 – Crowbar Circuit Note: Refer to the stability boundary conditions in Figure 15 to determine allowable values for C. R3 (see Note) R1A TL431/A & TL431B O R B 12V R4 (Note) VBATT IO TL431/A & TL431B R2B NO RS 0.1% ⎛ R1B ⎞ Low Limit = ⎜ 1 + ⎟ • VREF ⎝ R2B ⎠ ⎛ ⎝ High Limit = ⎜ 1 + APPLICATIONS T R2A SI GN S R1 0.1% VO = ⎜ 1 + WWW . Microsemi .C OM VBATT R1B ⎞ ⎟ • VREF R2B ⎠ LED on when Low Limit < VBATT < High Limit Figure 20 – Voltage Monitor Figure 21 – Precision Contact – Current Sink Note: R3 and R4 are selected to provide the desired LED intensity and > 1mA cathode current to the TL431/A & TL431B at the available V+ Copyright © 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 11