LD2981CU18TR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Low Dropout, Fixed Output Voltage
• Package: SOT-223
• Essence: Linear Voltage Regulator
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 2.5V to 16V
• Output Voltage: 1.8V
• Output Current: Up to 100mA
• Dropout Voltage: 300mV at 100mA
• Line Regulation: ±0.05%
• Load Regulation: ±0.1%
• Quiescent Current: 75µA typical
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LD2981CU18TR is a three-pin device with the following pin configuration:

• Pin 1: Input Voltage (VIN)
• Pin 2: Ground (GND)
• Pin 3: Output Voltage (VOUT)

Functional Features

• Low dropout voltage allows for efficient regulation even when the input voltage is close to the output voltage.
• Fixed output voltage of 1.8V ensures a stable power supply for various applications.
• Excellent line and load regulation provide precise voltage control.
• Low quiescent current minimizes power consumption in standby or low-load conditions.
• Thermal shutdown and current limit protection ensure safe operation.

Advantages and Disadvantages

Advantages

• Compact SOT-223 package offers space-saving benefits.
• Wide input voltage range allows for flexibility in different power supply scenarios.
• Low dropout voltage enables efficient voltage regulation.
• Good line and load regulation provide accurate voltage control.
• Low quiescent current helps conserve power.

Disadvantages

• Limited output current of up to 100mA may not be suitable for high-power applications.
• Fixed output voltage may not be adjustable for certain requirements.

Working Principles

The LD2981CU18TR is a linear voltage regulator that uses a pass transistor to regulate the output voltage. It operates by comparing the reference voltage with a fraction of the output voltage, adjusting the pass transistor accordingly to maintain a stable output voltage. The dropout voltage is minimized through the use of a low-resistance pass element.

Detailed Application Field Plans

The LD2981CU18TR is commonly used in various electronic devices and systems, including:

1. Battery-powered devices: Provides a stable voltage supply for portable electronics such as smartphones, tablets, and wearable devices.
2. Industrial control systems: Ensures reliable power regulation in automation equipment, sensors, and control modules.
3. Automotive electronics: Used in automotive applications like infotainment systems, lighting controls, and engine management units.
4. Communication systems: Provides regulated power for routers, switches, and other network equipment.
5. Consumer electronics: Used in audio/video equipment, gaming consoles, and home appliances.

Detailed and Complete Alternative Models

1. LM1117-1.8: Similar fixed 1.8V voltage regulator with a TO-220 package.
2. LP2981-1.8: Low dropout voltage regulator with a fixed 1.8V output and SOT-23 package.
3. LT1761-1.8: Micropower low noise LDO regulator with a fixed 1.8V output and SOT-23 package.

These alternative models offer similar functionality and can be considered based on specific application requirements.

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