Overview
The ATL431LIBQDBZRQ1, produced by Texas Instruments, is an advanced version of the TL431-Q1 adjustable precision shunt regulator. This component is designed to offer enhanced stability, lower temperature drift, and lower reference current compared to its predecessors. It is qualified for automotive applications and adheres to AEC-Q100 test guidelines, ensuring reliability over a wide temperature range of –40°C to 125°C.
The device features a three-pin configuration in a SOT-23 (DBZ) package and is capable of adjusting output voltage from approximately 2.5 V to 36 V using two external resistors. It is ideal for applications requiring precise voltage regulation, such as onboard regulation, adjustable power supplies, and switching power supplies.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOT-23 (DBZ) |
| Pins | 3 |
| Operating Temperature Range (°C) | –40 to 125 |
| Reference Voltage Tolerance at 25°C | 0.5% (B Grade), 1% (A Grade) |
| Typical Temperature Drift | 14 mV (Q Temp) |
| Output Impedance | 0.2 Ω (Typical) |
| Sink-Current Capability | 1 mA to 100 mA |
| Adjustable Output Voltage | VREF to 36 V |
Key Features
- Qualified for automotive applications with AEC-Q100 test guidance.
- Device temperature grade 1: –40°C to 125°C ambient operating temperature range.
- Low output noise and typical output impedance of 0.2 Ω.
- Sink-current capability: 1 mA to 100 mA.
- Adjustable output voltage from VREF (approximately 2.5 V) to 36 V.
- Active output circuitry providing a sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- Internally compensated for stability without an output capacitor.
Applications
- Adjustable voltage and current referencing.
- Secondary side regulation in flyback SMPSs.
- Zener replacement.
- Voltage monitoring.
- Comparator with integrated reference.
- Onboard regulation, adjustable power supplies, and switching power supplies.
Q & A
- What is the operating temperature range of the ATL431LIBQDBZRQ1?
The operating temperature range is –40°C to 125°C.
- What are the reference voltage tolerances available for this device?
The reference voltage tolerances are 0.5% (B Grade) and 1% (A Grade) at 25°C.
- What is the typical output impedance of the ATL431LIBQDBZRQ1?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of this device?
The sink-current capability ranges from 1 mA to 100 mA.
- How can the output voltage be adjusted?
The output voltage can be adjusted from VREF (approximately 2.5 V) to 36 V using two external resistors.
- Is the ATL431LIBQDBZRQ1 internally compensated for stability?
Yes, the device is internally compensated for stability without the need for an output capacitor.
- What are some common applications of the ATL431LIBQDBZRQ1?
Common applications include adjustable voltage and current referencing, secondary side regulation in flyback SMPSs, Zener replacement, voltage monitoring, and comparator with integrated reference.
- Can the ATL431LIBQDBZRQ1 be used as a comparator?
Yes, the device can be used as a comparator in open-loop mode, especially for undervoltage and overvoltage detection.
- What is the package type and pin count of the ATL431LIBQDBZRQ1?
The device comes in a SOT-23 (DBZ) package with 3 pins.
- Is the ATL431LIBQDBZRQ1 qualified for automotive use?
Yes, it is qualified for automotive applications and adheres to AEC-Q100 test guidelines.
