The UTCLD1117A-3.3V-A is a low dropout (LDO) positive voltage regulator designed and manufactured by UTC (Unisonic Technologies Co., Ltd.). It is specifically designed to provide a stable 3.3V output voltage with a minimal voltage difference between the input and output (dropout voltage). This regulator is commonly used in various electronic devices to provide a regulated power supply for sensitive components.

Applications

• Motherboards
• Graphics cards
• DVD players
• Set-top boxes
• Microcontroller power supplies
• Battery-powered devices
• Post regulators for switching power supplies

Features

• Low dropout voltage: Ensures regulation with small input-output voltage differentials.
• 3.3V fixed output voltage: Provides a precise and stable 3.3V power supply.
• Output current of 800mA: Delivers sufficient power for a range of applications.
• Over-temperature protection: Protects the regulator from thermal damage.
• Current limiting: Prevents excessive current flow, protecting the regulator and load.
• Reverse battery protection: Safeguards the regulator from damage due to reverse polarity.
• Available in SOT-223 package: Compact size for space-constrained applications.

Benefits

• Stable and accurate 3.3V power supply: Ensures proper operation of connected components.
• Efficient regulation: Minimizes power loss and heat generation.
• Protection features: Enhances reliability and prevents damage from common electrical faults.
• Ease of use: Requires minimal external components for operation.
• Wide operating temperature range: Suitable for various environments.
• Long lifespan: High-quality design and components ensure durability.

Additional Details

The UTCLD1117A-3.3V-A operates with an input voltage range typically between 4.75V and 15V. The dropout voltage is typically around 1.1V at the maximum output current. It requires a small output capacitor (typically a few microfarads) for stability. The SOT-223 package provides good thermal dissipation. Always refer to the official UTC datasheet for precise electrical characteristics, application guidelines, and recommended component values.

Proper PCB layout is essential for optimal performance, especially regarding thermal management. Ensure adequate heat sinking to prevent overheating, especially at higher input voltages and output currents.