LD2981ABM18TR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Low dropout voltage, low quiescent current, high accuracy
• Package: SOT-23-5
• Essence: Linear voltage regulator
• Packaging/Quantity: Tape and reel, 3000 pieces per reel

Specifications

• Output Voltage: 1.8V
• Dropout Voltage: 400mV at 100mA
• Quiescent Current: 50µA
• Line Regulation: 0.05%/V
• Load Regulation: 0.2%
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LD2981ABM18TR has a total of five pins arranged as follows:

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Pin 1: Input Voltage (VIN) Pin 2: Ground (GND) Pin 3: Enable (EN) Pin 4: Bypass Capacitor (BYP) Pin 5: Output Voltage (VOUT)

Functional Features

• Low dropout voltage ensures stable output even with small input-output differentials.
• Low quiescent current minimizes power consumption in standby mode.
• High accuracy provides precise voltage regulation.
• Built-in thermal shutdown protection prevents overheating.

Advantages and Disadvantages

Advantages: - Low dropout voltage allows for efficient power conversion. - Low quiescent current extends battery life in portable applications. - High accuracy ensures reliable voltage regulation.

Disadvantages: - Limited output current capability (100mA). - Requires an external bypass capacitor for optimal performance.

Working Principles

The LD2981ABM18TR is a linear voltage regulator that maintains a constant output voltage regardless of variations in the input voltage or load conditions. It achieves this by using a pass transistor to regulate the voltage drop across it.

When the input voltage (VIN) is applied, the regulator compares it with a reference voltage and adjusts the pass transistor accordingly to maintain a stable output voltage (VOUT). The enable pin (EN) can be used to turn the regulator on or off, while the bypass capacitor (BYP) helps reduce noise and improve stability.

Detailed Application Field Plans

The LD2981ABM18TR is commonly used in various electronic devices that require a stable 1.8V power supply. Some typical application fields include:

1. Mobile Devices: Smartphones, tablets, portable media players.
2. Embedded Systems: Microcontrollers, sensors, IoT devices.
3. Communication Equipment: Routers, modems, network switches.
4. Automotive Electronics: Infotainment systems, navigation units.
5. Industrial Control Systems: PLCs, motor drives, power supplies.

Detailed and Complete Alternative Models

1. LD2981ABM25TR: 2.5V output voltage variant.
2. LD2981ABM33TR: 3.3V output voltage variant.
3. LD2981ABM50TR: 5.0V output voltage variant.
4. LD2981ABMADJTR: Adjustable output voltage variant.

These alternative models provide different output voltage options to suit various application requirements.

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