LD1117STR

Product Overview

Category

LD1117STR belongs to the category of voltage regulators.

Use

It is commonly used to regulate and stabilize voltage in electronic circuits.

Characteristics

• LD1117STR is a low-dropout linear voltage regulator.
• It provides a fixed output voltage with low power dissipation.
• It has a high ripple rejection ratio and excellent line regulation.
• LD1117STR is designed to be compatible with various applications.

Package

The LD1117STR comes in a small surface-mount package, making it suitable for compact electronic devices.

Essence

The essence of LD1117STR lies in its ability to provide stable and regulated voltage output, ensuring reliable performance of electronic circuits.

Packaging/Quantity

LD1117STR is typically packaged in reels or tubes, with varying quantities depending on the manufacturer's specifications.

Specifications

• Input Voltage Range: 4.2V to 15V
• Output Voltage Options: 1.2V, 1.8V, 2.5V, 3.3V, 5V
• 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

Detailed Pin Configuration

The LD1117STR has three pins:

1. VIN (Input Voltage): This pin is connected to the input voltage source.
2. VOUT (Output Voltage): The regulated output voltage is obtained from this pin.
3. GND (Ground): This pin is connected to the ground reference.

Functional Features

• Low dropout voltage ensures efficient voltage regulation even when the input voltage is close to the desired output voltage.
• Overcurrent and thermal protection mechanisms safeguard the regulator and the connected circuitry.
• LD1117STR has a built-in current limit feature to prevent excessive current flow.

Advantages

• Compact size and surface-mount package make it suitable for space-constrained applications.
• High ripple rejection ratio ensures stable output voltage even in the presence of noise.
• Wide input voltage range allows compatibility with various power sources.
• Excellent line and load regulation provide precise voltage control.

Disadvantages

• Limited maximum output current may restrict its use in high-power applications.
• Dropout voltage can cause power dissipation and reduce efficiency in certain scenarios.

Working Principles

LD1117STR operates based on the principle of linear voltage regulation. It uses a pass transistor to regulate the output voltage by adjusting the resistance between the input and output terminals. By maintaining a constant voltage drop across the pass transistor, LD1117STR ensures a stable output voltage regardless of variations in the input voltage.

Detailed Application Field Plans

LD1117STR finds extensive application in various electronic devices and systems, including:

1. Battery-powered devices: It regulates the voltage supplied by batteries to ensure consistent performance.
2. Microcontrollers and embedded systems: LD1117STR provides stable voltage supply to these sensitive components.
3. Communication equipment: It helps maintain reliable voltage levels in communication devices.
4. Automotive electronics: LD1117STR is used in automotive applications to regulate voltage for different subsystems.
5. Industrial automation: It plays a crucial role in regulating voltage in industrial control systems.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to LD1117STR include:

1. LM317: A popular adjustable voltage regulator with a wide input voltage range.
2. LT1086: A low dropout positive fixed voltage regulator with high accuracy.
3. LDO50V: A low-dropout voltage regulator designed for high-voltage applications.
4. TS2940: A low-power voltage regulator with low dropout voltage and high output current capability.

These alternative models can be considered based on specific requirements and compatibility with the application at hand.

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