Overview
The TL431LIAQDBZRQ1 is an automotive, adjustable, precision shunt regulator produced by Texas Instruments. This device is part of the TL431LI-Q1 series, known for its optimized reference current and thermal stability across a wide temperature range. It is AEC-Q100 qualified, making it suitable for automotive applications, and is also applicable in commercial and military environments. The TL431LIAQDBZRQ1 offers a high degree of accuracy and low leakage current, enhancing system performance in various power supply and regulation applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade) | % |
| Minimum Typical Output Voltage | 2.495 V | V |
| Adjustable Output Voltage Range | 2.495 V to 36 V | V |
| Temperature Drift | 27 mV (grade 1), 34 mV (grade 0) | mV |
| Output Impedance | 0.3 Ω (typical) | Ω |
| Sink-Current Capability | Imin = 0.6 mA (max), IKA = 15 mA (max) | mA |
| Reference Input Current | 0.4 µA (max) | µA |
| Deviation of Reference Input Current over Temperature | 0.3 µA (max) | µA |
| Ambient Operating Temperature Range | –40°C to +125°C (grade 1), –40°C to +150°C (grade 0) | °C |
| Package | SOT-23 (DBZ) |
Key Features
- High accuracy with initial tolerances of 0.5% and 1% at 25°C for B and A grades, respectively.
- Low output drift versus temperature, ensuring good stability over the entire temperature range.
- Adjustable output voltage between 2.495 V and 36 V using two external resistors.
- Typical output impedance of 0.3 Ω and sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- Optimized reference input current (Iref) and deviation of reference input current over temperature (IIdev) for higher system accuracy and lower leakage current.
- AEC-Q100 qualified for automotive applications with temperature grades 1 and 0 for maximum ambient operating temperatures of 125°C and 150°C, respectively.
Applications
- Inverter and motor control systems.
- DC/DC converters and switching power supplies.
- LED lighting systems.
- On-board chargers (OBC) and infotainment systems.
- Engine management actuators, transmission, power steering, and powertrain exhaust sensors.
- Alternator starters and other automotive electronic systems.
Q & A
- What is the TL431LIAQDBZRQ1 used for?
The TL431LIAQDBZRQ1 is used as an adjustable, precision shunt regulator in various applications including onboard regulation, adjustable power supplies, and switching power supplies.
- What are the temperature grades available for the TL431LIAQDBZRQ1?
The device is available in two temperature grades: grade 1 (–40°C to +125°C) and grade 0 (–40°C to +150°C).
- What is the adjustable output voltage range of the TL431LIAQDBZRQ1?
The output voltage can be set to any value between 2.495 V and 36 V using two external resistors.
- What is the typical output impedance of the TL431LIAQDBZRQ1?
The typical output impedance is 0.3 Ω.
- What are the sink-current capabilities of the TL431LIAQDBZRQ1?
The sink-current capability ranges from 0.6 mA (minimum) to 15 mA (maximum).
- What is the reference input current of the TL431LIAQDBZRQ1?
The reference input current is 0.4 µA (maximum).
- Is the TL431LIAQDBZRQ1 AEC-Q100 qualified?
Yes, the TL431LIAQDBZRQ1 is AEC-Q100 qualified for automotive applications.
- What package type is the TL431LIAQDBZRQ1 available in?
The device is available in the SOT-23 (DBZ) package.
- Can the TL431LIAQDBZRQ1 replace Zener diodes in some applications?
Yes, the TL431LIAQDBZRQ1 can replace Zener diodes due to its sharp turn-on characteristic and adjustable output voltage.
- What are some common applications of the TL431LIAQDBZRQ1?
Common applications include inverter and motor control, DC/DC converters, LED lighting, on-board chargers, and various automotive electronic systems.
