Overview
The LMV431AIM5X from Texas Instruments is a precision 1.24 V adjustable shunt regulator. It is part of the LMV431 family, which includes the LMV431, LMV431A, and LMV431B, each with different initial tolerances. The LMV431AIM5X is specifically designed for industrial temperature ranges and offers a competitive balance of performance and cost. This component is capable of operating over a wide voltage range from 1.24 V to 30 V and is temperature compensated, making it suitable for various applications requiring low-voltage zener diode type performance.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Reference Voltage (VREF) | 1.222 | 1.24 | 1.258 | V |
| Deviation of Reference Input Voltage Over Temperature (VDEV) | 6 | - | 20 | mV |
| Minimum Cathode Current for Regulation (IZ(MIN)) | 55 | - | 80 | µA |
| Off-State Current (IZ(OFF)) | 0.001 | - | 0.1 | µA |
| Dynamic Output Impedance (rZ) | 0.25 | - | 0.4 | Ω |
| Operating Temperature Range | -40 | - | 85 | °C |
| Cathode Voltage Range | - | - | 30 | V |
| Cathode Current Range | 0.1 | - | 15 | mA |
Key Features
- Low-voltage operation with a wide adjust range (1.24 V to 30 V)
- 1% initial tolerance for the LMV431A model
- Temperature compensated for industrial temperature range (39 PPM/°C for the LMV431AI)
- Low operation current (55 µA)
- Low output impedance (0.25 Ω)
- Fast turn-on response
- Low cost
Applications
- Shunt regulator
- Series regulator
- Current source or sink
- Voltage monitor
- Error amplifier in 3 V off-line switching regulators
- Low drop-out regulator (e.g., 3 V to 2.7 V)
- Voltage detector
Q & A
- What is the reference voltage of the LMV431AIM5X?
The reference voltage (VREF) is typically 1.24 V, with a range of 1.222 V to 1.258 V at 25°C. - What is the minimum cathode current required for regulation?
The minimum cathode current for regulation (IZ(MIN)) is 55 µA. - What is the dynamic output impedance of the LMV431AIM5X?
The dynamic output impedance (rZ) is typically 0.25 Ω, with a range of 0.25 Ω to 0.4 Ω. - What is the operating temperature range of the LMV431AIM5X?
The operating temperature range is from -40°C to 85°C. - What are the typical applications of the LMV431AIM5X?
Typical applications include shunt regulators, series regulators, current sources or sinks, voltage monitors, error amplifiers in switching regulators, and voltage detectors. - How is the LMV431AIM5X temperature compensated?
The LMV431AIM5X is temperature compensated for the industrial temperature range with a temperature coefficient of 39 PPM/°C. - What is the off-state current of the LMV431AIM5X?
The off-state current (IZ(OFF)) is typically 0.001 µA to 0.1 µA. - What is the maximum cathode voltage of the LMV431AIM5X?
The maximum cathode voltage is 30 V. - What is the typical operation current of the LMV431AIM5X?
The typical operation current is 55 µA. - Is the LMV431AIM5X stable with capacitive loads?
Yes, it is typically stable with capacitive loads greater than 10 nF and less than 50 pF.
