The LM1117IMPX-3.3/NOPB by Texas Instruments is a low-dropout (LDO) linear voltage regulator designed to deliver a fixed output of 3.3V with a maximum current of 800mA. It features a low dropout voltage of 1.2V at full load, making it suitable for applications where the input voltage is close to the output voltage. The device integrates current limiting and thermal shutdown features to protect against overcurrent and overheating conditions.
This regulator is available in a space-saving SOT-223 package, making it ideal for compact designs. It requires a minimum of 10-µF tantalum capacitor at the output to enhance transient response and stability. The LM1117IMPX-3.3/NOPB is designed for a wide range of applications, including AC drive power stages, merchant network and server PSUs, industrial AC/DC supplies, ultrasound scanners, and servo drive control modules.
Voltage Regulators
Low-dropout (LDO) linear voltage regulators are designed to maintain a constant output voltage despite variations in the input voltage and load conditions. They are particularly useful in applications where the supply voltage is close to the output voltage, minimizing power loss and improving efficiency.
When selecting an LDO regulator, it's important to consider the output voltage and current requirements, dropout voltage, line and load regulation, package size, and thermal characteristics. The dropout voltage is a key parameter as it determines the minimum input voltage required to maintain regulation. Good line and load regulation ensure stable output voltage under varying conditions. Thermal considerations are also important to prevent the device from overheating.
LDO regulators find applications in a variety of electronic devices, including portable and battery-powered equipment, where power efficiency is critical. They are also used in noise-sensitive applications due to their ability to provide clean and stable output voltage.