Texas Instruments

LM1117T-3.3

LM1117T-3.3 Description

The LM1117T-3.3 is a fixed-output linear voltage regulator designed by Texas Instruments, offering a regulated output voltage of 3.3V with a maximum output current of 800mA. This regulator is housed in a TO-220-3 package, making it suitable for through-hole mounting. It features a maximum input voltage of 15V and a dropout voltage of 1.2V at 800mA, ensuring efficient operation even at high input-to-output voltage differentials. The LM1117T-3.3 also includes protection features such as over-current and over-temperature protection, enhancing its reliability and robustness. Despite being marked as obsolete, this regulator remains a viable option for applications requiring a stable 3.3V supply with moderate current capabilities.

LM1117T-3.3 Features

• Fixed Output Voltage: The LM1117T-3.3 provides a stable 3.3V output, making it ideal for applications requiring a precise voltage supply.
• High Output Current: With a maximum output current of 800mA, this regulator can power a variety of devices and circuits.
• Low Dropout Voltage: The maximum dropout voltage of 1.2V at 800mA ensures efficient operation, even with minimal input-to-output voltage difference.
• Over-Current and Over-Temperature Protection: These protection features enhance the reliability and robustness of the regulator, safeguarding against potential faults.
• Low Quiescent Current: The quiescent current of 5mA minimizes power consumption, making it suitable for low-power applications.
• High PSRR: The power supply rejection ratio (PSRR) of 75dB at 120Hz ensures minimal noise and ripple on the output voltage.
• Wide Operating Temperature Range: The LM1117T-3.3 operates reliably within a temperature range of 0°C to 125°C, making it suitable for a variety of environmental conditions.
• Through-Hole Mounting: The TO-220-3 package is designed for through-hole mounting, providing a secure and durable installation.

LM1117T-3.3 Applications

The LM1117T-3.3 is well-suited for a range of applications where a stable 3.3V supply is required. Some specific use cases include:

• Microcontroller Power Supplies: Providing a stable voltage for microcontrollers and other low-power embedded systems.
• Sensor Applications: Powering sensors that require a precise and stable voltage source.
• Communication Modules: Supplying power to communication modules such as Wi-Fi, Bluetooth, and Zigbee devices.
• Industrial Control Systems: Ensuring reliable power supply for control systems and automation equipment.
• Consumer Electronics: Used in various consumer electronics devices where a stable 3.3V supply is necessary.

Conclusion of LM1117T-3.3

The LM1117T-3.3 is a reliable and efficient linear voltage regulator that offers a stable 3.3V output with a maximum current of 800mA. Its low dropout voltage, low quiescent current, and high PSRR make it an excellent choice for applications requiring a precise and stable voltage supply. Despite being marked as obsolete, the LM1117T-3.3 remains a viable option for designers and engineers looking for a robust and efficient power management solution. Its through-hole mounting and wide operating temperature range further enhance its versatility and reliability in various industrial and consumer applications.