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FEATURES

CATHODE

ANODE

REF

ANODE

JG PACKAGE

(TOP VIEW)

NC − No internal connection

ANODE terminals are connected internally.

DESCRIPTION/ORDERING INFORMATION

REF

ANODE

CATHODE

TL1431-EP

PRECISION PROGRAMMABLE REFERENCE

SLVS529C – APRIL 2004 – REVISED DECEMBER 2006

• Controlled Baseline • Low Reference Current (REF)

– One Assembly/Test Site, One Fabrication • Adjustable Output Voltage . . . V

I(ref)

to 36 V

Site

• Extended Temperature Performance of –55 ° C

to 125 ° C

• Enhanced Diminishing Manufacturing Sources

(DMS) Support

• Enhanced Product-Change Notification

• Qualification Pedigree

(1)

• 0.4% Initial Voltage Tolerance

• 0.2- Ω Typical Output Impedance

• Fast Turnon . . . 500 ns

• Sink Current Capability . . . 1 mA to 100 mA

(1) Component qualification in accordance with JEDEC and

industry standards to ensure reliable operation over an

extended temperature range. This includes, but is not limited

to, Highly Accelerated Stress Test (HAST) or biased 85/85,

temperature cycle, autoclave or unbiased HAST,

electromigration, bond intermetallic life, and mold compound

life. Such qualification testing should not be viewed as

justifying use of this component beyond specified

performance and environmental limits.

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 V

I(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.

ORDERING INFORMATION

PACKAGE

(1)

ORDERABLE PART NUMBER TOP-SIDE MARKING

–40 ° C to 125 ° C SOIC – D Reel of 2500 TL1431QDREP 1431QE

–55 ° C to 125 ° C SOIC – D Reel of 2500 TL1431MDREP 1431ME

(1) Package drawings, standard packing quantities, thermal data, symbolizatin, and PCB design guidelines are available at

www.ti.com/sc/package.

SYMBOL

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.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (21 pages)

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TL1431-EP PRECISION PROGRAMMABLE REFERENCE www.ti.com SLVS529C – APRIL 2004 – REVISED DECEMBER 2006 FEATURES • • • • • • • • • (1) • • Controlled Baseline – One Assembly/Test Site, One Fabrication Site Extended Temperature Performance of –55°C to 125°C Enhanced Diminishing Manufacturing Sources (DMS) Support Enhanced Product-Change Notification Qualification Pedigree (1) 0.4% Initial Voltage Tolerance 0.2-Ω Typical Output Impedance Fast Turnon . . . 500 ns Sink Current Capability . . .
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TL1431-EP PRECISION PROGRAMMABLE REFERENCE www.ti.com SLVS529C – APRIL 2004 – REVISED DECEMBER 2006 FUNCTIONAL BLOCK DIAGRAM CATHODE + − REF Vref ANODE EQUIVALENT SCHEMATIC(1) 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 (1) 2 2, 3, 6, 7 All component values are nominal.
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TL1431-EP PRECISION PROGRAMMABLE REFERENCE www.ti.
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TL1431-EP PRECISION PROGRAMMABLE REFERENCE www.ti.
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TL1431-EP PRECISION PROGRAMMABLE REFERENCE www.ti.com SLVS529C – APRIL 2004 – REVISED DECEMBER 2006 PARAMETER MEASUREMENT INFORMATION VKA Input Input VKA IKA IKA R1 VI(ref) R2 II(ref) VI(ref) 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.
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TL1431-EP PRECISION PROGRAMMABLE REFERENCE www.ti.com SLVS529C – APRIL 2004 – REVISED DECEMBER 2006 TYPICAL CHARACTERISTICS (1) (1) Data at high and low temperatures are applicable only within the recommended operating free-air temperature ranges of the various devices.
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TL1431-EP PRECISION PROGRAMMABLE REFERENCE www.ti.com SLVS529C – APRIL 2004 – REVISED DECEMBER 2006 CATHODE CURRENT vs CATHODE VOLTAGE CATHODE CURRENT vs CATHODE VOLTAGE 150 800 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 − 50 200 0 − 100 − 150 −3 400 −2 −1 0 1 VKA − Cathode Voltage − V 2 − 200 −2 3 −1 0 Figure 6. VKA = 36 V VI(ref) = 0 4 −0.85 VKA = 3 V to 36 V −0.95 0.
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TL1431-EP PRECISION PROGRAMMABLE REFERENCE www.ti.com SLVS529C – APRIL 2004 – REVISED DECEMBER 2006 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 f − Frequency − Hz Figure 10.
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TL1431-EP PRECISION PROGRAMMABLE REFERENCE www.ti.com SLVS529C – APRIL 2004 – REVISED DECEMBER 2006 EQUIVALENT INPUT-NOISE VOLTAGE OVER A 10-s 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 8 6 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.
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TL1431-EP PRECISION PROGRAMMABLE REFERENCE www.ti.com SLVS529C – APRIL 2004 – REVISED DECEMBER 2006 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 230 Ω 9 µF 40 + 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.
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TL1431-EP PRECISION PROGRAMMABLE REFERENCE www.ti.com SLVS529C – APRIL 2004 – REVISED DECEMBER 2006 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.
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TL1431-EP PRECISION PROGRAMMABLE REFERENCE www.ti.com SLVS529C – APRIL 2004 – REVISED DECEMBER 2006 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.
PAGE 13
TL1431-EP PRECISION PROGRAMMABLE REFERENCE www.ti.com SLVS529C – APRIL 2004 – REVISED DECEMBER 2006 V(BATT) V(BATT) R In Out µA7805 2N2222 VO 30 Ω TL1431 0.01 µF 2N2222 Common VO TL1431 4.7 kΩ R2 R1 0.1% R2 0.1% ǒ 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 18. Precision High-Current Series Regulator R Ǔ ǒ VO + 1 ) R1 VI(ref) R2 V(BATT) R1 VO Figure 19.
PAGE 14
TL1431-EP PRECISION PROGRAMMABLE REFERENCE www.ti.com SLVS529C – APRIL 2004 – REVISED DECEMBER 2006 R3 12 V V(BATT) 6.8 kΩ 10 kΩ 5 V +0.5% TL1431 R4 TL1431 − 10 kΩ 0.1% R1B R1A VCC TL1431 + X Not Used 10 kΩ 0.1% TL598 R2A R2B ǒ Ǔ High Limit + ǒ1 ) R1AǓV I(ref) R2A Low Limit + 1 ) R1B V I(ref) R2B Feedback 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. Figure 24. PWM Converter With 0.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 31-May-2014 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
PAGE 17
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TL1431MDREP SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 TL1431QDREP SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TL1431MDREP SOIC D 8 2500 367.0 367.0 35.0 TL1431QDREP SOIC D 8 2500 367.0 367.0 35.
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