Overview
The TLV431AILPRE3, produced by Texas Instruments, is a low-voltage adjustable precision shunt regulator. This device is part of the TLV431 family, known for its low-voltage operation and high precision. It features a reference voltage of 1.24V and can be adjusted to output voltages ranging from 1.24V to 6V using two external resistors. The TLV431AILPRE3 is characterized for operation from –40°C to 85°C, making it suitable for a wide range of industrial, automotive, telecom, and computing applications.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Reference Voltage (VREF) | 1.24V | |
| Reference Voltage Tolerance at 25°C | 1% (TLV431A), 0.5% (TLV431B), 1.5% (TLV431) | For TLV431AILPRE3, it is 1% |
| Adjustable Output Voltage (VO) | VREF to 6V | |
| Typical Temperature Drift | 6 mV (–40°C to 85°C) | |
| Operational Cathode Current | 80 µA typical | |
| Output Impedance | 0.25 Ω typical | |
| Package | SC-70 | 40% smaller footprint than SOT-23-3 |
| Minimum Cathode Current for Regulation | 55 µA to 80 µA | |
| Off-State Cathode Current | 0.001 µA to 0.1 µA | VREF = 0, VKA = 6V |
Key Features
- Low-voltage operation with a reference voltage of 1.24V
- Adjustable output voltage from 1.24V to 6V using two external resistors
- High precision with reference voltage tolerances of 1% at 25°C for the TLV431A version
- Low operational cathode current of 80 µA typical
- Ultra-small SC-70 package offering a 40% smaller footprint than SOT-23-3
- Internal amplifier and reference provide a sharp turn-on characteristic, making it an excellent replacement for low-voltage Zener diodes
- No external capacitor required for stability, though one can be used if desired
Applications
- Adjustable voltage and current referencing
- Secondary side regulation in flyback switching-mode power supplies (SMPSs)
- Zener replacement
- Voltage monitoring
- Comparator with integrated reference, particularly useful in isolated feedback circuits for 3V to 3.3V switching-mode power supplies
Q & A
- What is the reference voltage of the TLV431AILPRE3?
The reference voltage is 1.24V. - What is the adjustable output voltage range of the TLV431AILPRE3?
The output voltage can be adjusted from 1.24V to 6V using two external resistors. - What are the temperature ranges for the TLV431AILPRE3?
The device is characterized for operation from –40°C to 85°C. - What is the typical operational cathode current of the TLV431AILPRE3?
The typical operational cathode current is 80 µA. - What is the output impedance of the TLV431AILPRE3?
The output impedance is typically 0.25 Ω. - What package type is used for the TLV431AILPRE3?
The device is packaged in an ultra-small SC-70 package. - Can the TLV431AILPRE3 be used as a Zener diode replacement?
Yes, it is an excellent replacement for low-voltage Zener diodes due to its sharp turn-on characteristic. - Is an external capacitor required for stability?
No, an external capacitor is not required for stability, though one can be used if desired. - What are some common applications of the TLV431AILPRE3?
Common applications include adjustable voltage and current referencing, secondary side regulation in flyback SMPSs, Zener replacement, voltage monitoring, and as a comparator with integrated reference. - How does the TLV431AILPRE3 behave in open-loop and closed-loop configurations?
In open-loop, it behaves as a comparator, and in closed-loop, it behaves as a shunt regulator or error amplifier.
