LM431SBCMFX

Product Overview

Category: Integrated Circuits (ICs)

Use: Voltage References

Characteristics: - Adjustable Precision Shunt Regulator - Low Temperature Coefficient - Wide Operating Current Range - High Initial Accuracy - Programmable Output Voltage - Low Dynamic Output Impedance - Fast Turn-On Response Time

Package: SOT-23-3

Essence: The LM431SBCMFX is a precision shunt regulator that can be used to provide a stable reference voltage. It is commonly used in various electronic circuits where a precise voltage reference is required.

Packaging/Quantity: The LM431SBCMFX is available in a SOT-23-3 package, which is a small surface-mount package. It is typically sold in reels or tubes containing multiple units.

Specifications

• Reference Voltage Range: 2.495V to 36V
• Operating Current Range: 1μA to 100mA
• Temperature Coefficient: ±50ppm/°C
• Initial Accuracy: ±0.5%
• Dynamic Output Impedance: 0.2Ω
• Turn-On Response Time: 4μs

Pin Configuration

The LM431SBCMFX has three pins:

1. Anode (A): This pin is connected to the anode of the internal reference zener diode.
2. Cathode (K): This pin is connected to the cathode of the internal reference zener diode.
3. Adjust (ADJ): This pin is used to adjust the output voltage by connecting a resistor divider network.

Functional Features

• Adjustable Output Voltage: The LM431SBCMFX allows for easy adjustment of the output voltage by using an external resistor divider network.
• Precision Voltage Reference: It provides a stable and accurate reference voltage for various applications.
• Low Temperature Coefficient: The LM431SBCMFX has a low temperature coefficient, ensuring stable performance over a wide temperature range.
• Wide Operating Current Range: It can operate with a wide range of current, making it suitable for different circuit requirements.
• Fast Turn-On Response Time: The LM431SBCMFX has a fast turn-on response time, enabling quick regulation of the output voltage.

Advantages and Disadvantages

Advantages: - High precision and accuracy - Wide operating current range - Adjustable output voltage - Low temperature coefficient - Fast response time

Disadvantages: - Limited maximum output voltage (up to 36V) - Requires an external resistor divider network for voltage adjustment

Working Principles

The LM431SBCMFX works as a shunt regulator by comparing the reference voltage with the voltage across the adjust pin. It adjusts the current flowing through the cathode and anode to maintain a constant voltage at the adjust pin. By adjusting the resistor divider network connected to the adjust pin, the output voltage can be set to the desired value.

Application Field Plans

The LM431SBCMFX is widely used in various electronic circuits that require a stable and precise voltage reference. Some common application areas include:

1. Voltage regulators
2. Switching power supplies
3. Battery chargers
4. Audio amplifiers
5. Instrumentation systems
6. Industrial control systems

Alternative Models

Here are some alternative models that can be considered as alternatives to the LM431SBCMFX:

1. TL431: This is a popular alternative from Texas Instruments with similar features and specifications.
2. LT1634: A precision shunt voltage reference from Linear Technology.
3. MAX6126: A high-precision voltage reference from Maxim Integrated.

These alternative models offer similar functionality and can be used as replacements based on specific requirements.

In conclusion, the LM431SBCMFX is a versatile voltage reference IC that provides stable and accurate reference voltage for various electronic circuits. Its adjustable output voltage, low temperature coefficient, and wide operating current range make it suitable for a wide range of applications.