The LD1117AG-ADJ-AA3-A-R is a low dropout (LDO) voltage regulator manufactured by UTC (Unisonic Technologies Co., Ltd.). This regulator provides an adjustable output voltage and is designed to maintain a stable output even with variations in input voltage and load current. It's commonly used in various electronic devices to provide a configurable and regulated power supply.

Applications

• Microcontroller power supplies requiring variable voltage.
• Battery-powered devices needing optimized voltage settings.
• Post-regulation for switching power supplies where fine-tuning is necessary.
• Linear regulation in consumer electronics.
• Power management in portable devices requiring multiple voltage rails.

Features

• Adjustable output voltage (typically 1.25V to near Vin)
• Low dropout voltage
• Over-temperature protection
• Short-circuit protection
• High output current capability
• Stable with low ESR ceramic capacitors

Benefits

• Flexibility in voltage selection: Can be configured to provide a wide range of output voltages.
• Stable and accurate voltage regulation: Ensures reliable operation of connected devices.
• Protection against over-temperature and short circuits: Prevents damage to the regulator and connected circuitry.
• Extended battery life: Low dropout voltage improves efficiency, especially in battery-powered applications.
• Simplified design: Requires minimal external components (two resistors to set the output voltage).
• Compact size: Available in small surface-mount packages.

Additional Details

The LD1117AG-ADJ-AA3-A-R is typically available in a SOT-223 package. The 'AA3' likely refers to the packaging type, and '-A-R' indicates tape and reel packaging for automated assembly. The output voltage is adjusted using an external resistor divider network. The regulator can handle a substantial output current, typically up to 800mA or 1A, but this will be specified in the datasheet. Input voltage range is typically up to 15V or 18V. The low dropout voltage allows the regulator to operate with only a small difference between the input and output voltage, improving efficiency. Refer to the UTC datasheet for comprehensive electrical characteristics, thermal resistance, and application recommendations, including guidance on selecting the appropriate resistor values for the desired output voltage.