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.
  • LM317  -  1.5A adjustable positive voltage regulator
  • TLV1117  -  Single output LDO, 800mA internal current limit thermal overload protection
  • UA7805  -  1.5A Fixed 5V positive voltage regulator

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 0.25Ω. 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) (%)
Min Iz for Regulation (uA)
Iout/Iz (Max) (mA)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
TLV431 TLV431A TLV431B
Adjustable     Adjustable     Adjustable    
1.24     1.24     1.24    
6     6     6    
1.5     1     0.5    
55     55     55    
15     15     15    
Catalog     Catalog     Military    
-40 to 125
-40 to 85
0 to 70    
-40 to 125
-40 to 85
0 to 70    
-40 to 125
-40 to 85
0 to 70    
3SOT-23
3SOT-89
3TO-92
5SOT-23    
3SOT-23
3SOT-89
3TO-92
5SOT-23
8SOIC    
3SOT-23
3TO-92
3SOT-89
5SOT-23
6SC70    
0.23 | 1ku     0.32 | 1ku      

Companion parts

Part # Name Product Family Comments
TL431   Adjustable Precision Shunt Regulator   VOLTAGE REFERENCE - SHUNT VOLTAGE REFERENCE    It offers a 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   Adjustable Precision Shunt Regulator   VOLTAGE REFERENCE - SHUNT VOLTAGE REFERENCE    It offers a 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   Low-Voltage Adjustable Precision Shunt Regulator   VOLTAGE REFERENCE - SHUNT VOLTAGE REFERENCE    It offers a wider range for Vout (18V max) and Iz (80mA max), as well as different pinouts for SOT23-3 & SOT-89 packages  
TLVH432   Low-Voltage Adjustable Precision Shunt Regulator   VOLTAGE REFERENCE - SHUNT VOLTAGE REFERENCE    It offers a wider range for Vout (18V max) and Iz (80mA max), as well as different pinouts for SOT23-3 & SOT-89 packages.  
LM317   3/4 Pin 1.5A Adjustable Positive Voltage Regulator   LINEAR REGULATOR (LDO) - SINGLE CHANNEL LDO    1.5A adjustable positive voltage regulator  
TLV1117   Single Output LDO, 800mA, Fixed and Adj., Internal Current limit, Thermal Overload Protection   LINEAR REGULATOR (LDO) - SINGLE CHANNEL LDO    Single output LDO, 800mA internal current limit thermal overload protection  
UA7805   3 Pin 1.5A Fixed 5V Positive Voltage Regulator   LINEAR REGULATOR (LDO) - SINGLE CHANNEL LDO    1.5A Fixed 5V positive voltage regulator  
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