AMS1117-3.3V Step-Down Voltage Regulator Module – High-Efficiency 5V to 3.3V DC-DC Power Converter

Product Description The AMS1117 3.3V Step-Down Voltage Regulator Module is a compact and highly efficient power management solution designed to convert higher DC voltages into a stable 3.3V output. Based on the popular AMS1117 Low Dropout (LDO) linear regulator, this module is an essential tool for powering 3.3V sensitive electronics like ESP8266, ESP32, and various sensors from a standard 5V USB supply or battery pack. It features on-board filtering capacitors to ensure a clean, noise-free output and includes a bright red LED indicator for immediate power status confirmation. Its miniature footprint and simple 2-pin header design make it ideal for breadboard prototyping and integration into space-constrained DIY projects.

Key Features

• Stable 3.3V Output: Provides a consistent voltage with 1% accuracy, protecting sensitive CMOS-based microcontrollers.

• Low Dropout Performance: Capable of maintaining a stable output even when the input voltage is only slightly higher than the output (1.1V difference).

• Integrated Thermal Protection: Built-in circuitry prevents the IC from damage due to overheating or excessive current draw.

• On-board Filtering: Includes high-quality SMD capacitors to suppress electrical noise and provide a smooth DC ripple.

• Power Status LED: Features an integrated SMD LED that glows when the module is receiving input power, simplifying troubleshooting.

Technical Details

• Regulator Topology: Utilizes a linear regulator architecture, providing a significantly cleaner output compared to switching regulators.

• Current Handling: Supports a continuous output current of up to 800mA, sufficient for most WiFi and Bluetooth modules.

• Input-Output Differential: Optimized for a 5V input, though it can safely handle up to 7V DC.

• Power Dissipation: The PCB acts as a heat sink for the SOT-223 package; however, external cooling is recommended at peak current.

• Short Circuit Protection: Includes internal current limiting to protect the regulator during accidental output shorts.

• Input Polarity: Designed for standard DC input; ensure correct polarity at the VCC and GND pins to avoid damage.

• Filtering Stages: Employs a dual-capacitor setup (input and output) to handle transient load changes efficiently.

• Output Impedance: Very low output impedance ensures voltage stability even under varying load conditions.

• Pin Configuration: Standard 2.54mm pitch headers with clearly labeled IN, OUT, and GND pins.

• Logic Level Stability: Ideal for creating a shared 3.3V rail for I2C and SPI sensor networks.

• Miniature PCB: Double-sided FR-4 construction with high-grade solder masking for long-term durability.

• Voltage Reference: Features an internal bandgap reference for superior thermal stability.

• Low Quiescent Current: Draws only ~5mA of current while idle, making it efficient for battery-monitoring circuits.

• Response Time: Ultra-fast transient response to load changes, preventing voltage dips during WiFi transmission bursts.

• Compatibility: Directly compatible with Arduino, Raspberry Pi, and industrial PLC logic levels.