AMS1117-3.3
Overview
The AMS1117-3.3 is a low dropout (LDO) linear voltage regulator designed to provide up to 1A of output current at a fixed 3.3V. It is a widely used power management solution for converting 5V or higher supply rails down to 3.3V for microcontrollers and digital logic. This SOT-223 packaged component features internal thermal limiting and precision trimming to ensure output accuracy within 2 percent.
Why Choose This Part
The device offers a high power supply rejection ratio (PSRR) of 70dB at 120Hz, ensuring clean power delivery even with ripple on the input. Its low dropout characteristics and SOT-223 form factor make it an industry-standard choice for space-constrained designs requiring up to 1A of current. Integrated over-temperature protection provides robust reliability by preventing damage during thermal overload conditions.
Applications
Key Specifications
Getting Started
When integrating this LDO, place a 10uF or larger tantalum capacitor at the output to ensure stability and improve transient response. Ensure the input voltage does not exceed the 18V maximum limit and verify that the SOT-223 thermal pad has sufficient copper area on the PCB for heat dissipation. For prototyping, this regulator is frequently used on small breakout boards compatible with standard breadboards.
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