LT1121IST-3.3#TRPBF

Product Overview

Category

The LT1121IST-3.3#TRPBF belongs to the category of voltage regulators.

Use

This product is commonly used in electronic circuits to regulate and stabilize the output voltage.

Characteristics

• Voltage regulation: The LT1121IST-3.3#TRPBF provides a regulated output voltage of 3.3V.
• Low dropout: It has a low dropout voltage, allowing it to operate even when the input voltage is close to the desired output voltage.
• High efficiency: This voltage regulator offers high efficiency, minimizing power dissipation.
• Thermal shutdown: It includes a thermal shutdown feature that protects the device from overheating.
• Current limit protection: The LT1121IST-3.3#TRPBF incorporates current limit protection to prevent excessive current flow.

Package

This product comes in a small surface-mount package (SOT-223) which facilitates easy integration into circuit boards.

Essence

The LT1121IST-3.3#TRPBF is an essential component for maintaining a stable and regulated voltage supply in various electronic applications.

Packaging/Quantity

The LT1121IST-3.3#TRPBF is typically packaged in reels or tubes, with a quantity of 2500 units per reel/tube.

Specifications

• Input Voltage Range: 2.5V to 20V
• Output Voltage: 3.3V
• Dropout Voltage: 300mV at 800mA
• Maximum Output Current: 800mA
• Line Regulation: ±0.02%
• Load Regulation: ±0.04%
• Quiescent Current: 75µA
• Operating Temperature Range: -40°C to 125°C

Detailed Pin Configuration

The LT1121IST-3.3#TRPBF has the following pin configuration:

1. VIN (Input Voltage)
2. GND (Ground)
3. VOUT (Output Voltage)

Functional Features

• Voltage Regulation: The LT1121IST-3.3#TRPBF maintains a constant output voltage of 3.3V, regardless of changes in the input voltage or load conditions.
• Low Dropout: It can operate with a very small voltage difference between the input and output, ensuring efficient power conversion.
• Thermal Shutdown: The device automatically shuts down if the temperature exceeds a safe operating limit, protecting it from damage.
• Current Limit Protection: The LT1121IST-3.3#TRPBF incorporates current limit protection to prevent excessive current flow, safeguarding both the regulator and the connected circuitry.

Advantages and Disadvantages

Advantages

• Provides stable and regulated output voltage.
• Low dropout voltage enables efficient operation.
• High efficiency minimizes power dissipation.
• Thermal shutdown protects against overheating.
• Current limit protection prevents excessive current flow.

Disadvantages

• Limited maximum output current of 800mA.
• Requires external capacitors for stability.

Working Principles

The LT1121IST-3.3#TRPBF is a linear voltage regulator that uses a feedback mechanism to maintain a constant output voltage. It compares the output voltage with a reference voltage and adjusts the internal circuitry to ensure the desired output voltage is maintained. The dropout voltage is minimized by using a pass transistor that operates in its active region, allowing for efficient power conversion.

Detailed Application Field Plans

The LT1121IST-3.3#TRPBF finds applications in various electronic devices and systems, including but not limited to: - Battery-powered devices - Portable electronics - Embedded systems - Communication equipment - Industrial control systems

Detailed and Complete Alternative Models

• LM1117-3.3: A popular alternative with similar specifications and pin configuration.
• LT1763-3.3: Offers higher maximum output current and lower dropout voltage.
• MCP1702-3.3: Provides a cost-effective alternative with comparable performance.

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

In conclusion, the LT1121IST-3.3#TRPBF is a voltage regulator that provides stable and regulated output voltage of 3.3V. It offers low dropout, high efficiency, and various protection features. This product finds applications in diverse electronic systems and has alternative models available to suit different design needs.