• 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.

• Adjustable Voltage and Current Referencing
• Secondary Side Regulation in Flyback SMPSs
• Zener Replacement
• Voltage Monitoring
• Comparator with Integrated Reference

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 (see Figure 20). 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.