L4931CDT80

Product Overview

• Category: Voltage Regulator
• Use: To regulate and stabilize voltage in electronic circuits
• Characteristics: Low dropout, high accuracy, low quiescent current
• Package: DPAK (TO-252), SOT-223
• Essence: Linear voltage regulator
• Packaging/Quantity: Tape and reel packaging, 2500 units per reel

Specifications

• Output Voltage: 8.0V
• Input Voltage Range: 4.5V to 20V
• Dropout Voltage: 1.2V at 150mA load current
• Quiescent Current: 5mA (typical)
• Line Regulation: 0.04% (typical)
• Load Regulation: 0.1% (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L4931CDT80 has three pins:

1. Input Pin (VIN): Connects to the input voltage source.
2. Ground Pin (GND): Connected to the ground reference of the circuit.
3. Output Pin (VOUT): Provides the regulated output voltage.

Functional Features

• Low dropout voltage ensures efficient regulation even with small input-output differentials.
• High accuracy provides precise voltage regulation for sensitive electronic components.
• Low quiescent current minimizes power consumption when the load is light.
• Excellent line and load regulation characteristics ensure stable output voltage under varying conditions.
• Overcurrent and thermal protection features safeguard the regulator and connected components.

Advantages

• Easy to use and integrate into various electronic circuits.
• Compact package options allow for space-saving designs.
• Wide input voltage range enables compatibility with different power sources.
• Reliable and robust performance in harsh operating conditions.
• Cost-effective solution for voltage regulation requirements.

Disadvantages

• Linear regulators dissipate excess power as heat, reducing overall efficiency.
• Limited maximum output current compared to switching regulators.
• Not suitable for applications requiring high voltage differentials.

Working Principles

The L4931CDT80 is a linear voltage regulator that uses a pass transistor to regulate the output voltage. It compares the reference voltage with the feedback voltage and adjusts the pass transistor accordingly to maintain a stable output voltage. The dropout voltage is minimized by using a low saturation voltage pass element.

Detailed Application Field Plans

The L4931CDT80 is commonly used in various electronic devices and systems, including:

1. Battery-powered devices: Portable audio players, handheld gaming consoles, etc.
2. Automotive electronics: Infotainment systems, navigation units, etc.
3. Industrial control systems: PLCs, motor drives, etc.
4. Communication equipment: Routers, switches, wireless access points, etc.
5. Consumer electronics: Set-top boxes, televisions, home appliances, etc.

Detailed and Complete Alternative Models

1. LM7808: A popular 8V linear voltage regulator from Texas Instruments.
2. LT1085: A high-current 8V linear voltage regulator from Analog Devices.
3. NCP1117: An economical 8V linear voltage regulator from ON Semiconductor.
4. TPS7A47: A low-noise 8V linear voltage regulator from Texas Instruments.
5. MCP1700: A low quiescent current 8V linear voltage regulator from Microchip.

(Note: This list is not exhaustive and other alternative models are available from different manufacturers.)

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