TL1431QDRG4Q1

         SLVS534B − JUNE 2004 − REVISED APRIL 2008 D D D D D D D D PACKAGE (TOP VIEW) Qualified for Automotive Applications 0.4% Initial Voltage Tolerance 0.2-Ω Typical Output Impedance Fast Turnon . . . 500 ns Sink Current Capability . . . 1 mA to 100 mA Low Reference Current (REF) CATHODE ANODE ANODE NC Adjustable Output Voltage . . . VI(ref) to 36 V 1 8 2 7 3 6 4 5 REF ANODE ANODE NC NC − No internal connection ANODE terminals are connected internally. description/ordering information The TL1431 is a precision programmable reference with specified thermal stability over the automotive temperature range. The output voltage can be set to any value between VI(ref) (approximately 2.5 V) and 36 V with two external resistors (see Figure 16). This device has a typical output impedance of 0.2 Ω. Active output circuitry provides a very sharp turnon characteristic, making the device an excellent replacement for Zener diodes and other types of references in applications such as onboard regulation, adjustable power supplies, and switching power supplies. The TL1431Q is characterized for operation over the full automotive temperature range of −40°C to 125°C. ORDERING INFORMATION { TA ORDERABLE PART NUMBER PACKAGE‡ TOP-SIDE MARKING −40°C to 125°C SOIC (D) Reel of 2500 TL1431QDRQ1 1431Q1 † For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at http://www.ti.com. ‡ Package drawings, thermal data, and symbolization are available at http://www.ti.com/packaging. symbol REF ANODE CATHODE Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright  2008, Texas Instruments Incorporated  
 
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         SLVS534B − JUNE 2004 − REVISED APRIL 2008 functional block diagram CATHODE + − REF Vref ANODE equivalent schematic† CATHODE 1 800 Ω REF 800 Ω 8 20 pF 150 Ω 3.28 kΩ 4 kΩ 10 kΩ 2.4 kΩ 7.2 kΩ 20 pF 1 kΩ 800 Ω ANODE 2, 3, 6, 7 † All component values are nominal. 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 
         SLVS534B − JUNE 2004 − REVISED APRIL 2008 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Cathode voltage, VKA (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 V Continuous cathode current range, IKA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −100 mA to 150 mA Reference input current range, II(ref) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −50 µA to 10 mA Package thermal impedance, θJA (see Notes 2 and 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W Operating virtual junction temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. All voltage values are with respect to ANODE, unless otherwise noted. 2. Temperature and/or supply voltages must be limited to ensure that the maximum dissipation rating is not exceeded. 3. The package thermal impedance is calculated in accordance with JESD 51-7. DISSIPATION RATING TABLE PACKAGE TA ≤ 25°C POWER RATING DERATING FACTOR ABOVE TA = 25°C D 1102 mW 10.3 mW/°C TA = 70°C POWER RATING 638.5 mW TA = 85°C POWER RATING TA = 125°C POWER RATING 484 mW 72.1 mW recommended operating conditions VKA IKA Cathode voltage TA Operating free-air temperature Cathode current POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 MIN MAX VI(ref) 1 36 UNIT V 100 mA −40 125 °C 3 
         SLVS534B − JUNE 2004 − REVISED APRIL 2008 electrical characteristics at specified free-air temperature, IKA = 10 mA (unless otherwise noted) PARAMETER TA† TEST CONDITIONS TEST CIRCUIT 25°C TYP MAX 2490 2500 2510 UNIT VI(ref) Reference input voltage VKA = VI(ref) Full range VI(dev) Deviation of reference input voltage over full temperature range‡ VKA = VI(ref) Full range Figure 1 17 55 mV Ratio of change in reference input voltage to the change in cathode voltage ∆VKA = 3 V to 36 V Full range Figure 2 −1.1 −2 mV/V 2.5 Reference input current R1 = 10 kΩ, R2 = ∞ 1.5 II(ref) II(dev) Deviation of reference input current over full temperature range‡ R1 = 10 kΩ, R2 = ∞ Imin Minimum cathode current for regulation VKA = VI(ref) Ioff Off-state cathode current VKA = 36 V, |zKA| Output impedance§ VKA = VI(ref), f ≤ 1 kHz, IKA = 1 mA to 100 mA DVI(ref) DVKA Figure 1 MIN 2470 25°C Full range mV 2530 Figure 2 µA A 4 Full range Figure 2 0.5 2 µA 25°C Figure 1 0.45 1 mA 0.18 0.5 25°C VI(ref) = 0 Full range 25°C Figure 3 µA A 2 Figure 1 0.2 Ω 0.4 † Full range is −40°C to 125°C for Q-suffix devices. ‡ The deviation parameters VI(dev) and II(dev) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. The average full-range temperature coefficient of the reference input voltage a V is defined as: Ťa Ťǒ Ǔ V I(ref) ppm + °C ǒ V V I(dev) I(ref) ° Ǔ I(ref) 10 6 at 25 C Max VI(ref) DTA VI(dev) where: ∆TA is the rated operating temperature range of the device. Min VI(ref) ∆TA aV I(ref) is positive or negative, depending on whether minimum VI(ref) or maximum VI(ref), respectively, occurs at the lower temperature. § The output impedance is defined as: Ťz Ť + KA DVKA DI KA When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by: |z′| + DV, DI R1 which is approximately equal to Ťz KAŤ 1 ) . R2 ǒ 4 Ǔ POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 
         SLVS534B − JUNE 2004 − REVISED APRIL 2008 PARAMETER MEASUREMENT INFORMATION VKA Input Input VKA IKA IKA R1 VI(ref) II(ref) VI(ref) R2 Figure 1. Test Circuit for V(KA) = Vref ǒ Ǔ VKA + VI(ref) 1 ) R1 ) II(ref) R2 R1 Figure 2. Test Circuit for V(KA) > Vref Input VKA Ioff Figure 3. Test Circuit for Ioff TYPICAL CHARACTERISTICS Table of Graphs FIGURE Reference voltage vs Free-air temperature 4 Reference current vs Free-air temperature 5 Cathode current vs Cathode voltage 6, 7 Off-state cathode current vs Free-air temperature 8 Ratio of delta reference voltage to delta cathode voltage vs Free-air temperature 9 Equivalent input-noise voltage vs Frequency 10 Equivalent input-noise voltage over a 10-second period 11 Small-signal voltage amplification vs Frequency 12 Reference impedance vs Frequency 13 Pulse response 14 Stability boundary conditions 15 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 
         SLVS534B − JUNE 2004 − REVISED APRIL 2008 TYPICAL CHARACTERISTICS† REFERENCE VOLTAGE vs FREE-AIR TEMPERATURE REFERENCE CURRENT vs FREE-AIR TEMPERATURE 2.5 2.52 I I(ref) − Reference Current − µ A VI(ref) − Reference Voltage − V VI(ref) = VKA IKA = 10 mA 2.51 2.5 2.49 2.48 − 50 0 − 25 25 50 75 100 2 1.5 1 0.5 0 − 50 125 IKA = 10 mA R1 = 10 kΩ R2 = ∞ − 25 TA − Free-Air Temperature − °C 0 25 50 75 100 TA − Free-Air Temperature − °C Figure 4 Figure 5 CATHODE CURRENT vs CATHODE VOLTAGE CATHODE CURRENT vs CATHODE VOLTAGE 800 150 VKA = VI(ref) TA = 25°C VKA = VI(ref) TA = 25°C 600 I KA − Cathode Current − µ A I KA − Cathode Current − mA 100 50 0 − 50 400 200 0 − 100 − 150 −3 125 −2 0 1 −1 VKA − Cathode Voltage − V 2 3 − 200 −2 −1 0 1 2 3 4 VKA − Cathode Voltage − V Figure 6 Figure 7 † Data at high and low temperatures are applicable only within the recommended operating free-air temperature ranges of the various devices. 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 
         SLVS534B − JUNE 2004 − REVISED APRIL 2008 TYPICAL CHARACTERISTICS† RATIO OF DELTA REFERENCE VOLTAGE TO DELTA CATHODE VOLTAGE vs FREE-AIR TEMPERATURE OFF-STATE CATHODE CURRENT vs FREE-AIR TEMPERATURE 0.35 −0.85 VKA = 3 V to 36 V VKA = 36 V VI(ref) = 0 −0.95 0.3 ∆V I(ref) /∆V KA − mV/V IKA(off) − Off-State Cathode Current − mA 0.4 0.25 0.2 0.15 −1.05 −1.15 −1.25 0.1 −1.35 0.05 0 −50 − 25 0 25 50 75 100 −1.45 −50 125 − 25 TA − Free-Air Temperature − °C 0 25 50 75 100 125 TA − Free-Air Temperature − °C Figure 8 Figure 9 EQUIVALENT INPUT-NOISE VOLTAGE vs FREQUENCY 260 Hz IO = 10 mA TA = 25°C Vn − Equivalent Input-Noise Voltage − nV/ 240 220 200 180 160 140 120 100 10 100 1k 10 k 100 k f − Frequency − Hz Figure 10 † Data at high and low temperatures are applicable only within the recommended operating free-air temperature ranges of the various devices. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 7 
         SLVS534B − JUNE 2004 − REVISED APRIL 2008 TYPICAL CHARACTERISTICS EQUIVALENT INPUT-NOISE VOLTAGE OVER A 10-SECOND PERIOD 6 Vn − Equivalent Input-Noise Voltage − µV 5 4 3 2 1 0 −1 −2 −3 −4 f = 0.1 to 10 Hz IKA = 10 mA TA = 25°C −5 −6 0 2 4 6 8 10 t − Time − s 19.1 V 1 kΩ 910 Ω 2000 µF VCC VCC 500 µF TL1431 (DUT) + TLE2027 AV = 10 V/mV − 16 Ω 820 Ω 16 Ω 1 µF + 16 Ω − 1 µF 160 kΩ TLE2027 2.2 µF 33 kΩ AV = 2 V/V 0.1 µF 33 kΩ VEE VEE TEST CIRCUIT FOR 0.1-Hz TO 10-Hz EQUIVALENT INPUT-NOISE VOLTAGE Figure 11 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 CRO 1 MΩ 
         SLVS534B − JUNE 2004 − REVISED APRIL 2008 TYPICAL CHARACTERISTICS SMALL-SIGNAL VOLTAGE AMPLIFICATION vs FREQUENCY AV − Small-Signal Voltage Amplification − dB 60 IKA = 10 mA TA = 25°C Output I(K) 50 15 kΩ 40 230 Ω 9 µF + 30 8.25 kΩ − 20 GND 10 TEST CIRCUIT FOR VOLTAGE AMPLIFICATION 0 1k 10 k 100 k 1M 10 M f − Frequency − Hz Figure 12 REFERENCE IMPEDANCE vs FREQUENCY 100 |zka Ω |z KA| − Reference Impedance − O IKA = 1 mA to 100 mA TA = 25°C 1 kΩ Output I(K) 10 50 Ω − + 1 GND TEST CIRCUIT FOR REFERENCE IMPEDANCE 0.1 1k 10 k 100 k 1M 10 M f − Frequency − Hz Figure 13 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 9 
         SLVS534B − JUNE 2004 − REVISED APRIL 2008 TYPICAL CHARACTERISTICS PULSE RESPONSE 6 TA = 25°C 220 Ω VI Input Output Input and Output Voltages − V 5 4 Pulse Generator f = 100 kHz 3 Output 50 Ω 2 GND 1 TEST CIRCUIT FOR PULSE RESPONSE 0 0 1 5 2 3 4 t − Time − µs 6 7 Figure 14 150 Ω STABILITY BOUNDARY CONDITIONS† 100 I KA − Cathode Current − mA 90 80 A-VKA = VI(ref) B-VKA = 5 V C-VKA = 10 V D-VKA = 15 V IKA VI + IKA = 10 mA TA = 25°C CL VBATT − 70 Stable 60 Stable B C TEST CIRCUIT FOR CURVE A 50 40 A R1 = 10 kΩ 30 D IKA 150 Ω 20 CL 10 VI + 0 0.001 0.01 0.1 1 10 CL − Load Capacitance − µF † The areas under the curves represent conditions that may cause the device to oscillate. For curves B, C, and D, R2 and V+ are adjusted to establish the initial VKA and IKA conditions, with CL = 0. VBATT and CL then are adjusted to determine the ranges of stability. − TEST CIRCUIT FOR CURVES B, C, AND D Figure 15 10 POST OFFICE BOX 655303 VBATT R2 • DALLAS, TEXAS 75265 
         SLVS534B − JUNE 2004 − REVISED APRIL 2008 APPLICATION INFORMATION Table of Application Circuits APPLICATION FIGURE Shunt regulator 16 Single-supply comparator with temperature-compensated threshold 17 Precision high-current series regulator 18 Output control of a three-terminal fixed regulator 19 Higher-current shunt regulator 20 Crowbar 21 Precision 5-V, 1.5-A, 0.5% regulator 22 5-V precision regulator 23 PWM converter with 0.5% reference 24 Voltage monitor 25 Delay timer 26 Precision current limiter 27 Precision constant-current sink 28 R V(BATT) V(BATT) VO R1 0.1% VI(ref) VO Von ≈2 V Voff ≈V(BATT) TL1431 R2 0.1% Input ǒ TL1431 VIT = 2.5 V Ǔ VO + 1 ) R1 VI(ref) R2 GND NOTE A: R should provide cathode current ≥1 mA to the TL1431 at minimum V(BATT). Figure 16. Shunt Regulator POST OFFICE BOX 655303 Figure 17. Single-Supply Comparator With Temperature-Compensated Threshold • DALLAS, TEXAS 75265 11 
         SLVS534B − JUNE 2004 − REVISED APRIL 2008 APPLICATION INFORMATION V(BATT) V(BATT) R In Out µA7805 2N2222 VO 30 Ω 2N2222 TL1431 0.01 µF Common R1 TL1431 R2 4.7 kΩ VO R1 0.1% R2 0.1% ǒ Ǔ ǒ VO + 1 ) R1 VI(ref) R2 Ǔ V + 1 ) R1 V I(ref) R2 Min V = VI(ref) + 5 V NOTE A: R should provide cathode current ≥1 mA to the TL1431 at minimum V(BATT). Figure 19. Output Control of a Three-Terminal Fixed Regulator Figure 18. Precision High-Current Series Regulator V(BATT) V(BATT) R VO VO R1 TL1431 R1 C R2 R2 ǒ TL1431 ǒ Ǔ VO + 1 ) R1 VI(ref) R2 NOTE A: Refer to the stability boundary conditions in Figure 15 to determine allowable values for C. Figure 20. Higher-Current Shunt Regulator 12 POST OFFICE BOX 655303 Ǔ Vtrip + 1 ) R1 VI(ref) R2 Figure 21. Crowbar • DALLAS, TEXAS 75265 
         SLVS534B − JUNE 2004 − REVISED APRIL 2008 APPLICATION INFORMATION V(BATT) In V(BATT) VO = 5 V Rb Out VO = 5 V, 1.5 A, 0.5% LM317 27.4 kΩ 0.1% 8.2 kΩ Adjust TL1431 TL1431 243 Ω 0.1% 27.4 kΩ 0.1% 243 Ω 0.1% NOTE A: Rb should provide cathode current ≥1 mA to the TL1431. Figure 22. Precision 5-V, 1.5-A, 0.5% Regulator Figure 23. 5-V Precision Regulator 12 V 6.8 kΩ 5 V +0.5% TL1431 VCC 10 kΩ − 10 kΩ 0.1% + X Not Used 10 kΩ 0.1% TL598 Feedback Figure 24. PWM Converter With 0.5% Reference POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 13 
         SLVS534B − JUNE 2004 − REVISED APRIL 2008 APPLICATION INFORMATION R3 V(BATT) R1B R1A TL1431 680 Ω R4 12 V R2A 2 kΩ R TL1431 TL1431 R2B ǒ Ǔ High Limit + ǒ1 ) R1AǓV I(ref) R2A Low Limit + 1 ) R1B V I(ref) R2B On C Off LED on When Low Limit < V(BATT) < High Limit NOTE A: Select R3 and R4 to provide the desired LED intensity and cathode current ≥1 mA to the TL1431. Delay + R RCL 0.1% I 12 V I (12 V) * V I(ref) Figure 26. Delay Timer Figure 25. Voltage Monitor V(BATT) C IO V(BATT) IO R1 TL1431 TL1431 V IO + V R1 + RS 0.1% I(ref) ) IKA R CL (BATT) ǒ Ǔ I O h FE )I V IO + KA Figure 27. Precision Current Limiter 14 POST OFFICE BOX 655303 I(ref) RS Figure 28. Precision Constant-Current Sink • DALLAS, TEXAS 75265 PACKAGE OPTION ADDENDUM www.ti.com 10-Dec-2020 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) (4/5) (6) TL1431QDRG4Q1 ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 1431Q1 TL1431QDRQ1 ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 1431Q1 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of