TLV431B

低电压可调节精密并联稳压器

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.

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Low-Voltage Operation, VREF = 1.24 V

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Adjustable Output Voltage, VO = VREF to 6 V

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Reference Voltage Tolerances at 25°C

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0.5% for

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1% for TLV431A

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1.5% for TLV431

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Typical Temperature Drift

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4 mV 0°C to 70°C

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6 mV –40°C to 85°C

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11 mV –40°C to 125°C

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Low Operational Cathode Current, 80 µA Typ

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0.25-Ω Typical Output Impedance

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Ultra-Small SC-70 Package Offers 40% Smaller Footprint Than SOT-23-3

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See TLVH431 and TLVH432 for:

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Wider VKA 1.24 V to 18 V and IK 80 mA

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Additional SOT-89 Package

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Multiple Pinouts for SOT-23-3 and SOT-89 Packages

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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.