TLV431BQDBZR Voltage References Shunt Adjustable Precision References

TLV431BQDBZR Voltage References Lo-Vtg Adj Precision Shunt Regulator PMIC Power Management ICs

1 Features

1• 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 Typical

• 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.

2 Applications

• Adjustable Voltage and Current Referencing

• Secondary Side Regulation in Flyback SMPSs

• Zener Replacement

• Voltage Monitoring

• Comparator With Integrated Reference

3 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 (see the Parameter Measurement Information section). 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.

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