Overview
The TLV431IDBVR is a low-voltage adjustable precision shunt regulator produced by Texas Instruments. This 3-terminal device is designed for applications requiring a stable and adjustable voltage reference. It operates with a reference voltage (VREF) of 1.24V and can be adjusted to output voltages ranging from 1.24V to 6V using external resistors. The TLV431IDBVR is particularly useful in scenarios where low-voltage operation and high precision are necessary, such as in switching-mode power supplies, voltage monitoring, and as a replacement for low-voltage Zener diodes.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage (VREF) | 1.24V | V |
| Output Voltage Range | 1.24V to 6V | V |
| Reference Voltage Tolerance (at 25°C) | ±1.5% (TLV431), ±1.0% (TLV431A), ±0.5% (TLV431B) | % |
| Minimum Cathode Current for Regulation | 55 µA to 100 µA | µA |
| Off-State Cathode Current | 0.001 µA to 0.1 µA | µA |
| Dynamic Impedance | 0.25 Ω to 0.4 Ω | Ω |
| Operating Temperature Range | -40°C to 85°C (TLV431I) | °C |
| Package Type | SOT-23-5 |
Key Features
- Low-voltage operation with a reference voltage of 1.24V
- Adjustable output voltage from 1.24V to 6V using external resistors
- High precision with reference voltage tolerances of ±1.5%, ±1.0%, or ±0.5% depending on the version
- Low dynamic impedance of 0.25 Ω to 0.4 Ω
- Internal compensation for stability without an output capacitor
- Ideal for replacing low-voltage Zener diodes and for use in isolated feedback circuits
- AEC-Q100 qualified for automotive applications (TLV431x-Q1 versions)
Applications
- Switching-mode power supplies, particularly for 3V to 3.3V systems
- Secondary side regulation in flyback SMPSs
- Voltage monitoring and regulation
- Comparator with integrated reference
- Automotive applications (TLV431x-Q1 versions)
- Industrial, automotive, telecom, and computing equipment
Q & A
- What is the reference voltage of the TLV431IDBVR?
The reference voltage (VREF) is 1.24V.
- What is the adjustable output voltage range of the TLV431IDBVR?
The output voltage can be adjusted from 1.24V to 6V using external resistors.
- What are the reference voltage tolerances for different versions of the TLV431?
The tolerances are ±1.5% for the TLV431, ±1.0% for the TLV431A, and ±0.5% for the TLV431B.
- What is the minimum cathode current required for regulation?
The minimum cathode current for regulation is between 55 µA and 100 µA.
- What is the dynamic impedance of the TLV431IDBVR?
The dynamic impedance is between 0.25 Ω and 0.4 Ω.
- What is the operating temperature range for the TLV431I version?
The operating temperature range is -40°C to 85°C.
- In what package type is the TLV431IDBVR available?
The TLV431IDBVR is available in the SOT-23-5 package type.
- Is the TLV431IDBVR suitable for automotive applications?
The TLV431x-Q1 versions are AEC-Q100 qualified for automotive applications, but the TLV431IDBVR specifically is not mentioned as automotive-qualified in the provided sources.
- Can the TLV431IDBVR replace low-voltage Zener diodes?
- Does the TLV431IDBVR require an output capacitor for stability?
No, the TLV431IDBVR is internally compensated and does not require an output capacitor for stability.
