LM2931AD50

Product Overview

Category: Integrated Circuits (ICs)

Use: Voltage Regulator

Characteristics: - Low dropout voltage - Low quiescent current - High output voltage accuracy - Thermal shutdown protection - Short circuit current limit

Package: TO-252-2 (DPAK)

Essence: The LM2931AD50 is a low dropout voltage regulator designed to provide a fixed output voltage of 5.0V with a maximum current of 100mA.

Packaging/Quantity: The LM2931AD50 comes in a TO-252-2 package and is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 6.0V to 26V
• Output Voltage: 5.0V ± 2%
• Dropout Voltage: 0.5V (typical) at 100mA load current
• Quiescent Current: 120µA (typical)
• Line Regulation: 0.04%/V (typical)
• Load Regulation: 0.1% (typical)
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM2931AD50 has three pins:

1. Input (VIN): This pin is connected to the input voltage source.
2. Ground (GND): This pin is connected to the ground reference.
3. Output (VOUT): This pin provides the regulated output voltage of 5.0V.

Functional Features

• Low dropout voltage allows for efficient regulation even when the input voltage is close to the desired output voltage.
• Low quiescent current ensures minimal power consumption during standby or idle conditions.
• Thermal shutdown protection prevents the device from overheating under excessive operating conditions.
• Short circuit current limit protects the regulator and the load from excessive current.

Advantages

• Stable and accurate output voltage regulation.
• Wide input voltage range allows for versatile applications.
• Low dropout voltage enables efficient power conversion.
• Thermal shutdown protection enhances device reliability.
• Compact TO-252-2 package facilitates easy integration into various circuit designs.

Disadvantages

• Limited maximum output current of 100mA may not be suitable for high-power applications.
• Higher quiescent current compared to some other voltage regulators in the market.

Working Principles

The LM2931AD50 is a linear voltage regulator that uses a PNP pass transistor to regulate the output voltage. It operates by comparing the reference voltage with a feedback voltage derived from the output. The pass transistor adjusts its resistance to maintain a constant output voltage, compensating for changes in input voltage and load conditions.

Detailed Application Field Plans

The LM2931AD50 is commonly used in various electronic devices and systems, including but not limited to:

1. Battery-powered devices: Provides stable 5.0V supply voltage for microcontrollers, sensors, and other low-power components.
2. Automotive electronics: Regulates voltage for automotive accessories, such as audio systems, lighting modules, and control units.
3. Industrial control systems: Ensures reliable power supply for PLCs (Programmable Logic Controllers), motor drives, and instrumentation equipment.
4. Communication devices: Used in routers, modems, and network switches to maintain a consistent voltage level for proper operation.
5. Consumer electronics: Integrated into portable devices like smartphones, tablets, and digital cameras to regulate power delivery to internal components.

Detailed and Complete Alternative Models

1. LM1117-5.0: Similar voltage regulator with a higher maximum output current of 800mA.
2. LP2985-5.0: Low dropout voltage regulator with an ultra-low quiescent current of 1µA.
3. LT1763-5.0: High-performance regulator with a low dropout voltage of 300mV at 500mA load current.

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

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