Overview
The TLV431ACDBZRG4, produced by Texas Instruments, is a low-voltage, adjustable precision shunt regulator. This device is part of the TLV431 series, known for its low-voltage operation and high precision. The TLV431ACDBZRG4 is particularly suited for applications requiring a stable voltage reference with adjustable output voltage capabilities.
It operates with a reference voltage (VREF) of approximately 1.24V and can be adjusted to output voltages ranging from VREF to 6V using two external resistors. This makes it an ideal component for on-board regulation, adjustable power supplies, and isolated feedback circuits in switching-mode power supplies.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Voltage (VREF) | 1.222 | 1.24 | 1.258 | V |
| Reference Voltage Tolerance at 25°C | - | 1% | - | - |
| Output Voltage Range | VREF | - | 6V | V |
| Temperature Drift | - | 4mV (0°C to 70°C) | - | mV |
| Temperature Drift | - | 6mV (–40°C to 85°C) | - | mV |
| Temperature Drift | - | 11mV (–40°C to 125°C) | - | mV |
| Operational Cathode Current | - | 80µA | - | A |
| Output Impedance | - | 0.25Ω | - | Ω |
| Operating Temperature Range | 0°C | - | 70°C | °C |
| Package Type | - | SOT-23-3 (DBZ) | - | - |
Key Features
- Low-Voltage Operation: The device operates with a reference voltage (VREF) of approximately 1.24V, making it suitable for low-voltage applications.
- Adjustable Output Voltage: The output voltage can be set to any value between VREF (1.24V) and 6V using two external resistors.
- High Precision: Reference voltage tolerance at 25°C is 1% for the TLV431A grade.
- Low Temperature Drift: The device exhibits low temperature drift, ensuring stable operation over the specified temperature range.
- Low Operational Cathode Current: Typical operational cathode current is 80µA.
- Low Output Impedance: The device has a typical output impedance of 0.25Ω.
- Compact Packaging: Available in ultra-small SC-70 and SOT-23-3 packages, offering a smaller footprint.
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on characteristic, making it an excellent replacement for low-voltage Zener diodes.
Applications
- On-Board Regulation: Ideal for regulating voltages on the same board, providing a stable reference voltage.
- Adjustable Power Supplies: Used in adjustable power supplies where the output voltage needs to be precisely controlled.
- Switching-Mode Power Supplies: Suitable for isolated feedback circuits in switching-mode power supplies, especially for 3V to 3.3V applications.
- Isolated Feedback Circuits: When used with an optocoupler, it serves as an ideal voltage reference in isolated feedback circuits.
Q & A
- What is the reference voltage (VREF) of the TLV431ACDBZRG4?
The reference voltage (VREF) is approximately 1.24V.
- What is the adjustable output voltage range of the TLV431ACDBZRG4?
The output voltage can be set to any value between VREF (1.24V) and 6V using two external resistors.
- What is the reference voltage tolerance at 25°C for the TLV431A grade?
The reference voltage tolerance at 25°C is 1% for the TLV431A grade.
- What is the typical output impedance of the TLV431ACDBZRG4?
The typical output impedance is 0.25Ω.
- What is the operational cathode current of the TLV431ACDBZRG4?
The typical operational cathode current is 80µA.
- What are the common applications of the TLV431ACDBZRG4?
Common applications include on-board regulation, adjustable power supplies, and isolated feedback circuits in switching-mode power supplies.
- What is the operating temperature range of the TLV431ACDBZRG4?
The operating temperature range is from 0°C to 70°C.
- In what package types is the TLV431ACDBZRG4 available?
The device is available in ultra-small SC-70 and SOT-23-3 (DBZ) packages.
- Why is the TLV431ACDBZRG4 a good replacement for Zener diodes?
It provides a very sharp turn-on characteristic and low output impedance, making it an excellent replacement for low-voltage Zener diodes.
- Can the TLV431ACDBZRG4 be used in isolated feedback circuits?
Yes, when used with an optocoupler, it is an ideal voltage reference in isolated feedback circuits for switching-mode power supplies.
