LM2931D

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 protection

Package: TO-252, TO-220, SOIC-8

Essence: The LM2931D is a low dropout voltage regulator designed to provide a regulated output voltage even when the input voltage is very close to the output voltage.

Packaging/Quantity: The LM2931D is available in various package options, including TO-252, TO-220, and SOIC-8. The quantity per package depends on the manufacturer's specifications.

Specifications

• Input Voltage Range: 4V to 26V
• Output Voltage Range: 1.25V to 20V
• Dropout Voltage: 0.5V (typical)
• Quiescent Current: 120µA (typical)
• Output Current: Up to 100mA
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LM2931D has a standard pin configuration with three pins:

1. Input (VIN): This pin is used to connect the input voltage to the regulator.
2. Output (VOUT): This pin provides the regulated output voltage.
3. Ground (GND): This pin is connected to the ground reference.

Functional Features

• Low dropout voltage ensures stable output even with small input-output differentials.
• Low quiescent current minimizes power consumption.
• High output voltage accuracy provides precise regulation.
• Thermal shutdown protection prevents damage due to excessive temperature.
• Short circuit protection safeguards the regulator and connected components.

Advantages and Disadvantages

Advantages: - Stable output voltage even with low input-output differentials. - Low power consumption. - Precise regulation. - Protection against excessive temperature and short circuits.

Disadvantages: - Limited output current capacity (up to 100mA). - Higher dropout voltage compared to some other regulators.

Working Principles

The LM2931D is a linear voltage regulator that uses a PNP pass transistor to regulate the output voltage. It operates by comparing the reference voltage with the feedback voltage, adjusting the pass transistor's resistance to maintain a stable output voltage.

Detailed Application Field Plans

The LM2931D is commonly used in various applications, including: - Battery-powered devices - Portable electronics - Automotive systems - Industrial control systems - Communication equipment

Detailed and Complete Alternative Models

Some alternative models to the LM2931D include: - LM1117: Low dropout voltage regulator with higher output current capacity. - LT1763: Low dropout voltage regulator with ultra-low quiescent current. - LM317: Adjustable voltage regulator with higher output current capability.

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

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