The UTCLD1117L-3.3V-A is a low dropout (LDO) positive voltage regulator manufactured by UTC (Unisonic Technologies Co., Ltd.). This regulator provides a stable 3.3V output, commonly used in a variety of electronic devices to power microcontrollers, logic circuits, and other components that require a well-regulated 3.3V supply. The 'L' designation suggests specific enhancements or characteristics within the LD1117 family, such as improved dropout performance.

Applications

• Microcontroller power supplies
• FPGA/CPLD power supplies
• Logic circuits (3.3V logic)
• Post-regulation for switching power supplies
• Battery-powered devices
• Embedded systems

Features

• Fixed 3.3V output voltage: Provides a precise and stable 3.3V power supply.
• Low dropout voltage: Maintains regulation with a small input-output voltage differential.
• Output current of 800mA (typical): Delivers sufficient power for various applications.
• Over-temperature protection: Protects the regulator from thermal damage.
• Current limiting: Prevents excessive current flow, protecting both the regulator and the load.
• Available in a variety of packages (check datasheet for the specific package of the '-A' variant).

Benefits

• Stable and accurate 3.3V power supply: Ensures reliable operation of connected components.
• Efficient regulation: Minimizes power loss and heat generation.
• Protection features: Enhances reliability and prevents damage due to common electrical faults.
• Ease of use: Requires minimal external components for operation.
• Wide operating temperature range: Suitable for use in diverse environments.
• Long lifespan: Constructed with high-quality components for durability.

Additional Details

The UTCLD1117L-3.3V-A typically operates with an input voltage slightly higher than 3.3V (e.g., 4.3V to 12V, depending on the dropout voltage and load current). The dropout voltage is a key specification; refer to the datasheet for the exact value at the intended output current. Small input and output capacitors (ceramic or tantalum) are essential for stability. The package type ('-A' variant) dictates the thermal performance and mounting requirements. Always consult the official UTC datasheet for precise electrical characteristics, application guidelines, recommended component values, and package dimensions.

Proper PCB layout is critical for optimal performance, particularly for thermal management. Ensure adequate heat sinking, especially at higher input voltages and output currents. Follow the datasheet's guidelines for capacitor selection and placement to ensure stable operation and minimize noise.