AMS1117-3.3
Overview
The AMS1117-3.3 is a low dropout (LDO) linear voltage regulator designed to provide a fixed 3.3V output at up to 1A of current. It features a typical dropout voltage of 1.2V at full load and is a common power management solution for digital circuits and embedded systems. The device includes internal protection features such as current limiting and thermal shutdown to ensure reliable operation under fault conditions.
Why Choose This Part
This regulator offers a high Power Supply Rejection Ratio (PSRR) of 75dB at 120Hz, ensuring clean power for sensitive digital components. Its 1.5% output accuracy provides reliable voltage regulation, while the SOT-223 package offers a balance between small surface-mount footprint and effective heat dissipation for 1A loads.
Applications
Key Specifications
Getting Started
When designing with the AMS1117-3.3, ensure that a 22uF tantalum capacitor is placed on the output to maintain stability. The input voltage must be at least 1.2V higher than the 3.3V output to account for the dropout voltage at 1A. Thermal management is critical; ensure the SOT-223 tab is soldered to a sufficiently large PCB copper area to prevent thermal shutdown during high-current operation.
Also Consider
