TL431LI Adjustable precision shunt regulator with optimized reference current | TI.com

TL431LI (ACTIVE)

Adjustable precision shunt regulator with optimized reference current

 

Description

The TL431LI device is a three-terminal adjustable shunt regulator, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.495 V) and 36 V, with two external resistors. These devices have a typical output impedance of 0.3 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. This device is a pin-to-pin alternative to the industry standard TL431, with optimized Iref and IIdev performance. The lower Iref and IIdev values enable designers to achieve higher system accuracy and lower leakage current. The TL432LI device has exactly the same functionality and electrical specifications as the TL431LI device, but has a different pinout for the DBZ package.

The TL431LI device is offered in two grades, with initial tolerances (at 25°C) of 0.5% and 1%, for the B and A grade, respectively. In addition, low output drift versus temperature ensures good stability over the entire temperature range.

The TL43xLIxQ 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)
  • Minimum Typical Output Voltage: 2.495 V
  • Adjustable Output Voltage: Vref to 36 V
  • Operation From −40°C to +125°C (Q Temp)
  • Maximum Temperature Drift
    • 10 mV (C Temp)
    • 17 mV (I Temp)
    • 27 mV (Q Temp)
  • 0.3-Ω Typical Output Impedance
  • Sink-Current Capability
    • Imin = 1 mA (max)
    • IKA = 15 mA (max)
  • Reference Input Current IREF: 0.4 µA (max)
  • Deviation of Reference Input Current over Temperature, II(dev): 0.3 µA (max)

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Parametrics Compare all products in Shunt voltage references

 
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)
TL431LI ATL431 ATL431LI ATL432 ATL432LI LM431 LMV431 TL431 TL432 TL432LI
Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable    
2.495     2.5     2.5     2.5     2.5     2.5     1.24     2.495     2.495     2.495    
2.495     2.5     2.5     2.5     2.5     2.5     1.24     2.495     2.495     2.495    
36     36     36     36     36     36     30     36     36     36    
0.5
1    
0.5
1    
0.5
1    
0.5
1    
0.5
1    
0.5
1
2    
1.5     0.5
1
2    
0.5
1
2    
0.5
1    
63     92     92     92     92     97     129
138    
92     92     63    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 125
-40 to 85
0 to 70    
-40 to 125
-40 to 85    
-40 to 125
-40 to 85    
-40 to 125     -40 to 85
-40 to 125    
-40 to 85
0 to 70    
-40 to 85
0 to 70    
-40 to 85
-40 to 125
0 to 70    
-40 to 125
-40 to 85
0 to 70    
-40 to 85
-40 to 125
0 to 70    
400     20     80     20     80     400     80     400     400     400    
15     100     15     100     15     100     15     100     100     15    
SOT-23 | 3     SOT-23 | 3     SOT-23 | 3     SOT-23 | 3     SOT-23 | 3     SOIC | 8
SOT-23 | 3
TO-92 | 3    
SOT-23 | 5
TO-92 | 3    
PDIP | 8
SC70 | 6
SOIC | 8
SOT-23 | 3
SOT-23 | 5
SOT-89 | 3
SO | 8
TO-92 | 3
TSSOP | 8    
SOT-23 | 3
SOT-23 | 5
SOT-89 | 3    
SOT-23 | 3    
0.8     0.15     0.8     0.15     0.8     4     0.5     4     4     0.8    
0.4     0.05     0.4     0.05     0.4     1.2     0.4     2.5     2.5     0.4