LM1117 800mA Low-Dropout Linear Regulator

Pandi May 25, 2016 2 min read

To increase the performance and density of digital electronic systems while decreasing the power consumption, many manufacturers are designing to the new 3.3 volt logic standard. The lower supply voltage reduces power consumption internal to the circuitry allowing component densities to reach new levels of integration using fine line technologies. Additional benefits of the lower supply voltage include higher reliability and lower noise levels. Eventually 3.3 volt logic will be used universally, but presently low power systems are the primary application. Examples of these systems include battery operated portable equipment such as notebook/laptop computers, hand-held electronic field instruments and portable communications equipment. To support and accelerate the transition to the 3.3 volt environment, Tenet Technetronics has developed 3.3 volt logic converter board by using a LM1117 linear voltage regulator.

The LM1117 is a low drop-out voltage regulator with a drop-out of 1.2 V at 800 mA of load current. The two 10-µF tantalum capacitors are required at the output to improve the transient response and stability.

PIN NO.	PIN	DESCRIPTION
1	INPUT	In this pin of the IC positive unregulated voltage is given in regulation.
2	GROUND	In this pin where the ground is given. This pin is neutral for equally the input and output.
3	OUTPUT	The output of the regulated 3.3V volt is taken out at this pin of the IC regulator.