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TL431−Q1

ADJUSTABLE PRECISION SHUNT REGULATOR

SGLS302D − MARCH 2005 − REVISED MARCH 2013

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D Qualified for Automotive Applications

D Operation From −40°C to 125°C

D Reference Voltage Tolerance at 25°C

− 1%...A Grade

− 0.5% ...B Grade

D Typical Temperature Drift

− 14 mV (Q Temp)

D Low Output Noise

D 0.2-Ω Typical Output Impedance

D Sink-Current Capability = 1 mA to 100 mA

D Adjustable Output Voltage = V

ref

to 36 V

description

The TL431 is a three-terminal adjustable shunt

regulator with specified thermal stability over

applicable automotive temperature ranges. The output voltage can be set to any value between V

ref

(approximately 2.5 V) and 36 V, with two external resistors (see Figure 17). This device has a typical output

impedance of 0.2 Ω. Active output circuitry provides a sharp turn-on characteristic, making this device an

excellent replacement for Zener diodes in many applications, such as onboard regulation, adjustable power

supplies, and switching power supplies.

Ordering Information

{

PACKAGE

†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

SOT-23-5 (DBV) Reel of 3000 TL431AQDBVRQ1 TACQ

−40°C to 125°C

SOT-23-5 (DBV) Reel of 3000 TL431QDBVRQ1 T3QU

40 C to 125 C

SOT-23-3 (DBZ) Reel of 3000 TL431AQDBZRQ1 TAQU

†

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

CATHODEANODE

functional block diagram

CATHODE

REF

ANODE

ref

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.

PowerFLEX is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

NC − No internal connection

DBV (SOT-23-5) PACKAGE

(TOP VIEW)

†

CATHODE

ANODE

REF

†

Pin 2 is connected internally to ANODE

(die substrate) and should be floating or

connected to ANODE.

TL431−Q1

DBZ (SOT-23-3) PACKAGE

(TOP VIEW)

CATHODE

REF

ANODE

Summary of content (26 pages)

PAGE 1
TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 D Qualified for Automotive Applications D Operation From −40°C to 125°C D Reference Voltage Tolerance at 25°C D D D D D DBV (SOT-23-5) PACKAGE (TOP VIEW) − 1% . . . A Grade − 0.5% . . . B Grade Typical Temperature Drift − 14 mV (Q Temp) Low Output Noise 0.
PAGE 2
TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 equivalent schematic{ CATHODE 800 Ω 800 Ω 20 pF REF 150 Ω 3.28 kΩ 2.4 kΩ 4 kΩ 10 kΩ 20 pF 7.2 kΩ 1 kΩ 800 Ω ANODE † All component values are nominal. absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡ Cathode voltage, VKA (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 electrical characteristics over recommended operating conditions, TA = 25°C (unless otherwise noted) PARAMETER TEST CIRCUIT TEST CONDITIONS TL431Q UNIT MIN TYP MAX 2440 2495 2550 mV 14 34 mV −1.4 −2.
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TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 electrical characteristics over recommended operating conditions, TA = 25°C (unless otherwise noted) TEST CIRCUIT PARAMETER TEST CONDITIONS TL431BQ UNIT MIN TYP MAX 2483 2495 2507 mV 14 34 mV −1.4 −2.
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TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 PARAMETER MEASUREMENT INFORMATION Input VKA IKA Vref Figure 2. Test Circuit for VKA = Vref Input VKA IKA R1 Iref R2 Vref ǒ Ǔ V KA + V ref 1 ) R1 ) I ref R2 R1 Figure 3. Test Circuit for VKA > Vref Input VKA Ioff Figure 4.
PAGE 6
TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 TYPICAL CHARACTERISTICS Table 1.
PAGE 7
TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 TYPICAL CHARACTERISTICS{ V ref − Reference Voltage − mV 5 VKA = Vref IKA = 10 mA Vref = 2550 mV‡ 2560 I ref − Reference Current − μ A 2600 2580 REFERENCE CURRENT vs FREE-AIR TEMPERATURE REFERENCE VOLTAGE vs FREE-AIR TEMPERATURE 2540 2520 Vref = 2495 2500 mV‡ 2480 2460 Vref = 2440 mV‡ 2440 4 R1 = 10 kΩ R2 = ∞ IKA = 10 mA 3 2 1 2420 2400 −75 −50 −25 0 25 50 100 75 0 −75 125 −50 Data is for
PAGE 8
TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 TYPICAL CHARACTERISTICS{ RATIO OF DELTA REFERENCE VOLTAGE TO DELTA CATHODE VOLTAGE vs FREE-AIR TEMPERATURE OFF-STATE CATHODE CURRENT vs FREE-AIR TEMPERATURE − 0.85 VKA = 36 V Vref = 0 VKA = 3 V to 36 V − 0.95 2 ΔV ref / ΔV KA − mV/V I off − Off-State Cathode Current − μ A 2.5 1.5 1 0.5 0 −75 −1.05 −1.15 −1.25 −1.35 −50 −25 0 25 50 75 100 −1.
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TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 TYPICAL CHARACTERISTICS EQUIVALENT INPUT NOISE VOLTAGE OVER A 10-S PERIOD V n − Equivalent Input Noise Voltage − μV 6 5 4 3 2 1 0 −1 −2 −3 f = 0.1 to 10 Hz IKA = 10 mA TA = 25°C −4 −5 −6 0 1 2 3 4 5 6 7 8 9 10 t − Time − s 19.1 V 1 kΩ 500 μF 910 Ω 2000 μF VCC TL431 (DUT) 820 Ω + − 16 Ω 160 kΩ VCC 1 μF TLE2027 AV = 10 V/mV + 16 kΩ 16 kΩ 1 μF 0.
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TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 TYPICAL CHARACTERISTICS A V − Small-Signal Voltage Amplification − dB 60 SMALL-SIGNAL VOLTAGE AMPLIFICATION vs FREQUENCY IKA = 10 mA TA = 25°C IKA = 10 mA TA = 25°C 50 Output 15 kΩ IKA 232 Ω 40 9 μF + 30 − 8.
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TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 TYPICAL CHARACTERISTICS PULSE RESPONSE 6 TA = 25°C Input Input and Output Voltage − V 5 220 Ω 4 3 Pulse Generator f = 100 kHz Output 50 Ω GND 2 TEST CIRCUIT FOR PULSE RESPONSE 1 0 −1 Output 0 1 2 3 4 5 6 7 t − Time − μs Figure 15 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 11
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TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 TYPICAL CHARACTERISTICS STABILITY BOUNDARY CONDITIONS† FOR ALL TL431 AND TL431A DEVICES (EXCEPT FOR SOT23-3, SC-70, AND Q-TEMP DEVICES) 100 90 I KA− Cathode Current − mA 80 A VKA = Vref B VKA = 5 V C VKA = 10 V D VKA = 15 Vf 150 Ω IKA + TA = 25°C CL VBATT − B 70 Stable 60 C Stable 50 TEST CIRCUIT FOR CURVE A A 40 IKA 30 R1 = 10 kΩ D 20 150 Ω CL + 10 R2 0 0.001 VBATT − 0.01 0.
PAGE 13
TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 APPLICATION INFORMATION VI(BATT) R (see Note A) VO R1 0.1% Vref TL431 V O ǒ Ǔ + 1 ) R1 V ref R2 R2 0.1% RETURN NOTE A: R should provide cathode current ≥1 mA to the TL431 at minimum VI(BATT). Figure 17. Shunt Regulator VI(BATT) TL431 Input VIT ≈ 2.5 V VO Von ≈2 V Voff ≈VI(BATT) GND Figure 18. Single-Supply Comparator With Temperature-Compensated Threshold VI(BATT) R (see Note A) 2N222 2N222 30 Ω 0.
PAGE 14
TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 APPLICATION INFORMATION VI(BATT) IN OUT uA7805 Common VO R1 TL431 V O ǒ Ǔ + 1 ) R1 V ref R2 Minimum V O + V ref ) 5 V R2 Figure 20. Output Control of a Three-Terminal Fixed Regulator VI(BATT) VO R1 V O ǒ Ǔ + 1 ) R1 V ref R2 TL431 R2 Figure 21.
PAGE 15
TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 APPLICATION INFORMATION IN VI(BATT) LM317 8.2 kΩ OUT Adjust VO ≈5 V, 1.5 A 243 Ω 0.1% TL431 243 Ω 0.1% Figure 23. Precision 5-V 1.5-A Regulator VI(BATT) VO ≈5 V Rb (see Note A) 27.4 kΩ 0.1% TL431 27.4 kΩ 0.1% NOTE A: Rb should provide cathode current ≥1 mA to the TL431. Figure 24. Efficient 5-V Precision Regulator 12 V VCC 6.8 kΩ 5V 10 kΩ 10 kΩ 0.1% TL431 10 kΩ 0.
PAGE 16
TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 APPLICATION INFORMATION R3 (see Note A) VI(BATT) R4 (see Note A) R1B R1A ǒ ǒ TL431 R2A Ǔ Ǔ Low Limit + 1 ) R1B V ref R2B High Limit + 1 ) R1A V ref R2A LED on When Low Limit < VI(BATT) < High Limit R2B NOTE A: R3 and R4 are selected to provide the desired LED intensity and cathode current ≥1 mA to the TL431 at the available VI(BATT). Figure 26.
PAGE 17
TL431−Q1 ADJUSTABLE PRECISION SHUNT REGULATOR SGLS302D − MARCH 2005 − REVISED MARCH 2013 APPLICATION INFORMATION VI(BATT) IO I TL431 O + V ref RS RS 0.1% Figure 29.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Mar-2013 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) TL431AQDBVRQ1 SOT-23 DBV 5 3000 179.0 8.4 TL431AQDBZRQ1 SOT-23 DBZ 3 3000 179.0 TL431BQDBZRQ1 SOT-23 DBZ 3 3000 179.0 3.2 3.2 1.4 4.0 8.0 Q3 8.4 3.15 2.95 1.22 4.0 8.0 Q3 8.4 3.15 2.95 1.22 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TL431AQDBVRQ1 SOT-23 DBV 5 3000 203.0 203.0 35.0 TL431AQDBZRQ1 SOT-23 DBZ 3 3000 203.0 203.0 35.0 TL431BQDBZRQ1 SOT-23 DBZ 3 3000 203.0 203.0 35.
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