LD1117S33TR

Product Overview

• Category: Voltage Regulator
• Use: LD1117S33TR is a low dropout linear voltage regulator designed to provide a fixed output voltage of 3.3V with a maximum current of 800mA.
• Characteristics: It offers low dropout voltage, high accuracy, and excellent line and load regulation. The device operates within a wide input voltage range and is suitable for various applications.
• Package: LD1117S33TR comes in a small surface-mount SOT-223 package, which provides thermal resistance and efficient heat dissipation.
• Essence: This voltage regulator ensures a stable and reliable power supply by regulating the input voltage to a constant 3.3V output.
• Packaging/Quantity: LD1117S33TR is typically sold in reels containing 2500 units.

Specifications

• Input Voltage Range: 4.4V to 15V
• Output Voltage: 3.3V
• Maximum Output Current: 800mA
• Dropout Voltage: 1.2V (at 800mA)
• Line Regulation: ±0.2%
• Load Regulation: ±0.4%
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LD1117S33TR has three pins:

1. Input (IN): Connects to the input voltage source.
2. Ground (GND): Connected to the ground reference.
3. Output (OUT): Provides the regulated output voltage of 3.3V.

Functional Features

• Low dropout voltage allows operation with low input-output voltage differentials.
• High accuracy ensures precise output voltage regulation.
• Excellent line and load regulation maintain stability under varying conditions.
• Overcurrent and thermal protection safeguards the device from damage.

Advantages and Disadvantages

Advantages: - Low dropout voltage enables efficient power conversion. - High accuracy ensures reliable voltage regulation. - Wide input voltage range allows flexibility in various applications. - Overcurrent and thermal protection enhance device durability.

Disadvantages: - Limited maximum output current of 800mA may not be suitable for high-power applications. - SOT-223 package may require additional heat sinking for higher power dissipation.

Working Principles

The LD1117S33TR operates as a linear voltage regulator. It uses a pass transistor to regulate the output voltage by adjusting the resistance between the input and output terminals. The device compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to maintain a constant 3.3V output.

Detailed Application Field Plans

The LD1117S33TR is widely used in various electronic devices and systems, including:

1. Battery-powered devices: Provides stable voltage supply for microcontrollers, sensors, and other low-power components.
2. Communication equipment: Ensures reliable power for RF modules, transceivers, and signal processing circuits.
3. Industrial automation: Used in control systems, motor drivers, and instrumentation devices.
4. Automotive electronics: Suitable for powering sensors, actuators, and infotainment systems.
5. Consumer electronics: Found in portable devices, audio/video equipment, and home automation systems.

Detailed and Complete Alternative Models

1. LM1117-3.3: Similar to LD1117S33TR, this model offers a fixed 3.3V output voltage with a maximum current of 800mA. It comes in a TO-220 package.
2. LT1763-3.3: A low dropout linear regulator with a fixed 3.3V output voltage and a maximum current of 500mA. It is available in a small SOT-23 package.
3. TPS7A3301: This device provides a fixed 3.3V output voltage with a maximum current of 1A. It comes in a SOT-223 package and offers low dropout voltage.

These alternative models can be considered based on specific application requirements and design constraints.

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