TI TLV431AIDBVR

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 turnon characteristic, making them excellent replacements for low-voltage Zener diodes in many applications, including on-board regulation and adjustable power supplies.

• Low-Voltage Operation, VREF = 1.24 V
• Adjustable Output Voltage, V0 = 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 Typical
• 0.25-Ω Typical Output Impedance
• Ultra-Small SC-70 Package Offers 40% Smaller Footprint Than SOT-23-3

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