Overview
The TL431BQDBVTE4 is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 family, known for its high precision and thermal stability over a wide range of temperatures. This device is particularly useful in applications requiring adjustable output voltages and high stability, such as on-board regulation, adjustable power supplies, and switching power supplies. The TL431BQDBVTE4 offers a programmable output voltage range from the reference voltage (approximately 2.5V) to 36V, set using two external resistors.
Key Specifications
| Parameter | Value |
|---|---|
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) |
| Adjustable Output Voltage | Vref to 36V |
| Operating Temperature Range | −40°C to 125°C (Q grade) |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) |
| Output Impedance | 0.2Ω (typical) |
| Sink-Current Capability | 1 mA to 100 mA |
| Package Type | SOT-23-5 (DBV) |
| AEC-Q100 Qualification | Grade 1 |
Key Features
- Programmable output voltage up to 36V using two external resistors.
- Low output noise and typical output impedance of 0.2Ω.
- Sink-current capability from 1 mA to 100 mA.
- Enhanced stability over a wide temperature range (−40°C to 125°C for Q grade).
- Active output circuitry providing a sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- AEC-Q100 qualified (Grade 1) for automotive applications.
Applications
- Shunt regulator.
- Precision current limiter.
- Precision constant current sink.
- Isolated feedback loop for Switch Mode Power Supplies (SMPS).
- On-board regulation and adjustable power supplies.
Q & A
- What is the adjustable output voltage range of the TL431BQDBVTE4?
The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- What are the reference voltage tolerances available for the TL431BQDBVTE4?
The device is available in three grades with initial tolerances of 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- What is the operating temperature range for the TL431BQDBVTE4?
The device operates from −40°C to 125°C (Q grade).
- What is the typical output impedance of the TL431BQDBVTE4?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431BQDBVTE4?
The sink-current capability ranges from 1 mA to 100 mA.
- Is the TL431BQDBVTE4 AEC-Q100 qualified?
- What package type is the TL431BQDBVTE4 available in?
The device is available in the SOT-23-5 (DBV) package.
- What are some common applications of the TL431BQDBVTE4?
- How does the TL431BQDBVTE4 compare to Zener diodes?
The TL431BQDBVTE4 has active output circuitry providing a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- What is the typical temperature drift of the TL431BQDBVTE4?
The typical temperature drift is 6 mV (C temp) and 14 mV (I temp, Q temp).
