Low-Voltage Adjustable Precision Shunt Regulator - TLV431

TLV431 (ACTIVE)

Low-Voltage Adjustable Precision Shunt Regulator

Recommended alternative parts

  • TL431  -  Wider range for Vout (36V max) and Iz (80mA max), as well as different pinouts for SOT23-3 & SOT-89 packages, Vref=2.495, 2% trim accuracy.
  • TL431A  -  Wider range for Vout (36V max) and Iz (80mA max), as well as different pinouts for SOT23-3 & SOT-89 packages, Vref=2.495, 0.5% trim accuracy.
  • TLVH431  -  Wider range for Vout (18V max) and Iz (80mA max), as well as different pinouts for SOT23-3 & SOT-89 packages.
  • TLVH432  -  Wider range for Vout (18V max) and Iz (80mA max), as well as different pinouts for SOT23-3 & SOT-89 packages.
  • LM4040A25  -  Similar functionality with lower operating current.

Description

The TLV431 device is a low-voltage 3-terminal adjustable voltage reference with specified thermal stability over applicable industrial and commercial temperature ranges. Output voltage can be set to any value between VREF (1.24 V) and 6 V with two external resistors. These devices operate from a lower voltage (1.24 V) than the widely used TL431 and TL1431 shunt-regulator references.

When used with an optocoupler, the TLV431 device is an ideal voltage reference in isolated feedback circuits for 3-V to 3.3-V switching-mode power supplies. These devices have a typical output impedance of 0.25 Ω. Active output circuitry provides a very sharp turn-on characteristic, making them excellent replacements for low-voltage Zener diodes in many applications, including on-board regulation and adjustable power supplies.

Features

  • Low-Voltage Operation, VREF = 1.24 V
  • Adjustable Output Voltage, VO = VREF to 6 V
  • Reference Voltage Tolerances at 25°C
    • 0.5% for TLV431B
    • 1% for TLV431A
    • 1.5% for TLV431
  • Typical Temperature Drift
    • 4 mV (0°C to 70°C)
    • 6 mV (–40°C to 85°C)
    • 11 mV (–40°C to 125°C)
  • Low Operational Cathode Current, 80 µA Typ
  • 0.25-Ω Typical Output Impedance
  • Ultra-Small SC-70 Package Offers 40% Smaller Footprint Than SOT-23-3
  • See TLVH431 and TLVH432 for:
    • Wider VKA (1.24 V to 18 V) and IK (80 mA)
    • Additional SOT-89 Package
    • Multiple Pinouts for SOT-23-3 and SOT-89 Packages
  • On Products Compliant to MIL-PRF-38535,
    All Parameters Are Tested Unless Otherwise Noted. On All Other Products, Production Processing Does Not Necessarily Include Testing of All Parameters.

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Parametrics Compare all products in Shunt Voltage Reference

 
Reference Voltage
VO Adj (Min) (V)
VO Adj (Max) (V)
Initial Accuracy (Max) (%)
Rating
Operating Temperature Range (C)
Min Iz for Regulation (uA)
Iout/Iz (Max) (mA)
Approx. Price (US$)
TLV431 TLV431A TLV431A-Q1 TLV431B TLV431B-Q1
Adjustable     Adjustable     Adjustable     Adjustable     Adjustable    
1.24     1.24     1.24     1.24     1.24    
6     6     6     6     6    
1.5     1     1     0.5     0.5    
Catalog     Catalog     Automotive     Military     Automotive    
-40 to 125
-40 to 85
0 to 70    
-40 to 125
-40 to 85
0 to 70    
-40 to 125     -40 to 85
-40 to 125
0 to 70    
-40 to 125    
55     55     55     55     55    
15     15     15     15     15    
0.15 | 1ku     0.21 | 1ku     0.37 | 1ku       0.43 | 1ku    
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