LM346MX/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Low dropout voltage - High output current capability - Adjustable output voltage - Thermal shutdown protection - Short-circuit current limiting

Package: SOIC (Small Outline Integrated Circuit)

Essence: The LM346MX/NOPB is a voltage regulator IC that provides a stable and adjustable output voltage for various electronic applications.

Packaging/Quantity: The LM346MX/NOPB is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 2.5V to 7V
• Output Voltage Range: 1.25V to 5.5V
• Dropout Voltage: 0.4V at 1A
• Output Current: Up to 1.5A
• Quiescent Current: 75µA
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LM346MX/NOPB has the following pin configuration:

1. Vout: Output Voltage
2. ADJ: Adjust Pin (connected to external resistors to set the desired output voltage)
3. Vin: Input Voltage
4. GND: Ground

Functional Features

• Low Dropout Voltage: The LM346MX/NOPB has a low dropout voltage, allowing it to regulate the output voltage even when the input voltage is close to the desired output voltage.
• High Output Current Capability: With a maximum output current of 1.5A, the LM346MX/NOPB can power a wide range of electronic devices.
• Adjustable Output Voltage: By connecting external resistors to the ADJ pin, the output voltage can be adjusted within the specified range.
• Thermal Shutdown Protection: The IC includes a thermal shutdown feature that protects it from overheating, ensuring its reliability and longevity.
• Short-Circuit Current Limiting: The LM346MX/NOPB incorporates short-circuit current limiting to protect the circuit from excessive current flow during a short-circuit condition.

Advantages and Disadvantages

Advantages: - Low dropout voltage ensures efficient regulation - High output current capability for powering various devices - Adjustable output voltage provides flexibility in different applications - Thermal shutdown protection enhances reliability - Short-circuit current limiting protects the circuit

Disadvantages: - Limited input voltage range (2.5V to 7V) - Quiescent current of 75µA may be relatively high for low-power applications

Working Principles

The LM346MX/NOPB is a linear voltage regulator that uses a pass transistor to regulate the output voltage. It compares the reference voltage with the feedback voltage obtained from the ADJ pin to adjust the pass transistor's resistance, maintaining a stable output voltage. The internal circuitry ensures proper regulation by compensating for changes in load and input voltage.

Detailed Application Field Plans

The LM346MX/NOPB can be used in various applications, including: 1. Power supplies for microcontrollers and other digital circuits 2. Battery-powered devices requiring stable voltage levels 3. Automotive electronics 4. Industrial control systems 5. Portable electronic devices

Detailed and Complete Alternative Models

Some alternative models to the LM346MX/NOPB include: - LM317T: A popular adjustable voltage regulator with similar characteristics - LT1086: A low dropout voltage regulator with adjustable output voltage - LM7805: A fixed-output voltage regulator with a 5V output

These alternative models offer different features and specifications, allowing users to choose the most suitable option for their specific requirements.

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