TL432LI Adjustable precision shunt regulator with optimized reference current | TI.com

TL432LI (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

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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)
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    
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 Samples not available 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    
ATL432 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    
ATL432LI Samples not available 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    
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    
TL431LI Samples not available 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    
TL432 Order now