TL431 Adjustable precision shunt regulator | TI.com

TL431 (ACTIVE) Adjustable precision shunt regulator

Adjustable precision shunt regulator - TL431
Datasheet
TL431 / TL432 Precision Programmable Reference datasheet (Rev. P)
 

Recommended alternative parts

  • TL431LI  -  This is an upgraded version of the TL431 offering optimized reference current.
  • ATL431LI  -  This is an upgraded version of the ATL431 offering lower Ika compared to the TL431.
  • TLV431  -  Vout (12 V max) and Iz (80 mA max), as well as different pinouts for SOT23-3 & SOT-89 packages, 1.224-V Vref, 2% trim accuracy
  • TLVH431  -  Wider range for Vout (18 V max) and Iz (80 mA max), as well as different pinouts for SOT23-3 & SOT-89 packages

Special note

Read about TL431LI: Designing with the Improved TL431LI

Description

The TL431LI / TL432LI are pin-to-pin alternatives to TL431 / TL432. TL43xLI offers better stability, lower temperature drift (VI(dev)), and lower reference current (Iref) for improved system accuracy.

The TL431 and TL432 devices are three-terminal adjustable shunt regulators, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately
2.5 V) and 36 V, with two external resistors. These devices have a typical output impedance of 0.2 Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. The TL432 device has exactly the same functionality and electrical specifications as the TL431 device, but has different pinouts for the DBV, DBZ, and PK packages.

Both the TL431 and TL432 devices are offered in three grades, with initial tolerances (at 25°C) of 0.5%, 1%, and 2%, for the B, A, and standard grade, respectively. In addition, low output drift versus temperature ensures good stability over the entire temperature range.

The TL43xxC devices are characterized for operation from 0°C to 70°C, the TL43xxI devices are characterized for operation from –40°C to 85°C, and the TL43xxQ devices are characterized for operation from –40°C to 125°C.

Features

  • Reference Voltage Tolerance at 25°C
    • 0.5% (B Grade)
    • 1% (A Grade)
    • 2% (Standard Grade)
  • Adjustable Output Voltage: Vref to 36 V
  • Operation From −40°C to 125°C
  • Typical Temperature Drift (TL43xB)
    • 6 mV (C Temp)
    • 14 mV (I Temp, Q Temp)
  • Low Output Noise
  • 0.2-Ω Typical Output Impedance
  • Sink-Current Capability: 1 mA to 100 mA

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Parametrics

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Part number Order Reference voltage VO (V) VO adj (Min) (V) VO adj (Max) (V) Initial accuracy (Max) (%) Temp coeff (Max) (ppm/ degree C) Rating Operating temperature range (C) Iz for regulation (Min) (uA) Iout/Iz (Max) (mA) Package Group Iref (uA) I I(dev) (uA)
TL431 Order now Adjustable     2.495     2.495     36     0.5
1
2    		 92     Catalog     -40 to 85
-40 to 125
0 to 70    		 400     100     PDIP | 8
SC70 | 6
SOIC | 8
SOT-23 | 3
SOT-23 | 5
SOT-89 | 3
SO | 8
TO-92 | 3
TSSOP | 8    		 4     2.5    
ATL431 Order now Adjustable     2.5     2.5     36     0.5
1    		 92     Catalog     -40 to 125
-40 to 85    		 20     100     SOT-23 | 3     0.15     0.05    
ATL431LI Order now Adjustable     2.5     2.5     36     0.5
1    		 66     Catalog     -40 to 125
-40 to 85    		 80     15     SOT-23 | 3     0.4     0.3    
ATL432LI Order now Adjustable     2.5     2.5     36     0.5
1    		 66     Catalog     -40 to 85
-40 to 125    		 80     15     SOT-23 | 3     0.4     0.3    
TL431LI Order now Adjustable     2.495     2.495     36     0.5
1    		 63     Catalog     -40 to 125
-40 to 85
0 to 70    		 400     15     SOT-23 | 3     0.4     0.3    
TL432LI Order now Adjustable     2.495     2.495     36     0.5
1    		 63     Catalog     -40 to 85
-40 to 125
0 to 70    		 400     15     SOT-23 | 3     0.4     0.3