LD1117AS18TR

Basic Information Overview

• Category: Voltage Regulator
• Use: LD1117AS18TR is a low dropout voltage regulator designed to provide a fixed output voltage of 1.8V with a maximum current of 800mA.
• Characteristics:
  • Low dropout voltage: The LD1117AS18TR has a very low dropout voltage, which means it can regulate the output voltage even when the input voltage is close to the desired output voltage.
  • High accuracy: It provides a highly accurate output voltage of 1.8V, making it suitable for applications that require precise voltage regulation.
  • Thermal overload protection: The LD1117AS18TR incorporates thermal overload protection, which prevents the device from getting damaged due to excessive heat.
• Package: The LD1117AS18TR comes in a small surface mount SOT-223 package.
• Essence: The LD1117AS18TR is an essential component in electronic circuits that require a stable and regulated 1.8V power supply.
• Packaging/Quantity: The LD1117AS18TR is typically sold in reels containing a quantity of 2500 units.

Specifications

• Output Voltage: 1.8V
• Maximum Output Current: 800mA
• Dropout Voltage: 1.2V (typical)
• Input Voltage Range: 2.5V to 15V
• Line Regulation: 0.04% (typical)
• Load Regulation: 0.2% (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LD1117AS18TR has three pins: 1. Vin (Input): This pin is connected to the input voltage source. 2. Vout (Output): This pin provides the regulated 1.8V output voltage. 3. GND (Ground): This pin is connected to the ground reference.

Functional Features

• Low dropout voltage: The LD1117AS18TR can regulate the output voltage even when the input voltage is only slightly higher than the desired output voltage.
• Thermal overload protection: It incorporates thermal overload protection, ensuring safe operation even under high temperature conditions.
• Short-circuit protection: The LD1117AS18TR has built-in short-circuit protection, preventing damage to the device in case of a short circuit.
• Fast transient response: It provides a fast response to changes in load current, maintaining a stable output voltage.

Advantages and Disadvantages

Advantages: - Low dropout voltage ensures efficient voltage regulation. - High accuracy for precise voltage regulation. - Thermal overload protection prevents damage due to excessive heat. - Small package size allows for space-saving designs.

Disadvantages: - Limited maximum output current of 800mA. - Input voltage range is limited to 2.5V to 15V.

Working Principles

The LD1117AS18TR is a linear voltage regulator that uses a pass transistor to regulate the output voltage. It compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to maintain a stable output voltage of 1.8V. The dropout voltage is minimized by using a low resistance pass transistor.

Detailed Application Field Plans

The LD1117AS18TR is commonly used in various electronic applications, including: - Battery-powered devices: It can provide a stable 1.8V power supply for battery-powered devices such as portable audio players, digital cameras, and handheld gaming consoles. - Microcontroller systems: It is suitable for powering microcontrollers and other digital ICs that require a regulated 1.8V supply voltage. - Communication equipment: The LD1117AS18TR can be used in communication equipment like routers, switches, and wireless modules to provide a stable voltage for their internal circuitry.

Detailed and Complete Alternative Models

• LD1117AS33TR: Provides a fixed output voltage of 3.3V with a maximum current of 800mA.
• LD1117AS50TR: Provides a fixed output voltage of 5.0V with a maximum current of 800mA.
• LD1117ASADJTR: Adjustable output voltage version, allowing the user to set the desired output voltage within a specific range.

(Note: The above alternative models are from the same LD1117AS series and share similar characteristics and package options.)

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