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1. Description
The TLV431BIDBZT 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.
2. Feature
1. Low voltage operation, VREF = 1.24 V
2. Adjustable output voltage, VO = VREF to 6 V
3. Reference voltage tolerance at 25°C
– 0.5% for TLV431B
– TLV431A is 1%
– 1.5% for TLV431
4. Typical temperature drift
– 4 mV (0°C to 70°C)
– 6 mV (–40°C to 85°C)
– 11 mV (–40°C to 125°C)
5. Low operating cathode current, typically 80 µA
6. 0.25Ω typical output impedance
7. Ultra-small SC-70 package, the volume is reduced by 40% Occupied area than SOT-23-3
8. For information about the following, see TLVH431 and TLVH432:
- Wide VKA (1.24 V to 18 V) and IK (80 mA)
- Additional SOT-89 package
– Multiple pins of SOT-23-3 and SOT-89 Matching
3. Applications
1. Adjustable Voltage and Current Referencing
2. Secondary Side Regulation in Flyback SMPSs
3. Zener Replacement
4. Voltage Monitoring
5. Comparator With Integrated Reference
4. Pin configuration
5. Pin Functions
6. PACKAGE OUTLINE
