Overview: The AMS1117-3.3V DC-DC Buck Converter Module is a compact, fixed-output step-down power supply board designed to efficiently convert higher input voltages to a stable 3.3V DC, featuring dual USB ports for convenient powering or charging of low-voltage devices. Based on the AMS1117 linear regulator IC, this red PCB module provides up to 1A output with low dropout voltage, making it suitable for microcontrollers, sensors, and portable electronics powered by 5V-12V sources like batteries or adapters. The design includes a DC barrel jack for easy input connection and robust capacitors for ripple suppression.
Key Specifications:
Parameter
Value/Detail
IC Chip
AMS1117-3.3 (Linear Buck Regulator)
Input Voltage Range
4.4V – 12V DC (via DC jack or terminals)
Output Voltage
3.3V DC (fixed)
Output Current
1A max (800mA recommended for stability)
Output Power
Up to 3.3W max
Efficiency
Up to 80% (higher at lower currents)
Ripple & Noise
<50mV (typical)
USB Output
3.3V DC (via two USB-A ports, 500mA max per port)
Dimensions
Approx. 50mm x 35mm x 15mm
Weight
~15g
Operating Temperature
-40°C to +125°C
Connections:
Input (DC Jack or VIN+/VIN–): 5.5mm x 2.1mm barrel jack or screw terminals for 4.4V-12V DC input (positive tip, ground sleeve).
Output (VOUT+/VOUT–): Screw terminals for 3.3V load connection.
USB Ports (x2): Dual USB-A female outputs for direct 3.3V powering of compatible devices (e.g., ESP32 or sensors).
No adjustment needed—fixed 3.3V output for plug-and-play use.
Features and Benefits:
Stable 3.3V Supply: Provides clean, regulated power for logic-level components, with low dropout (1.1V) ensuring operation close to input voltage.
Dual USB Convenience: Two USB ports allow simultaneous powering of multiple devices, ideal for development boards or IoT setups.
Low Heat Generation: Linear regulation with heatsink-friendly design; suitable for enclosed applications without excessive thermal issues.
Easy Integration: Red PCB with gold-plated terminals and labeled pads (e.g., “IN,” “OUT”) for quick soldering or wiring in prototypes.
Overload Protection: Built-in safeguards against short circuits, over-temperature, and reverse polarity (add diode if required).
Compact Form Factor: Fits easily into battery packs or enclosures, with mounting holes for secure installation.
Applications:
Powering 3.3V microcontrollers like ESP8266/ESP32 or Arduino Nano.
USB-powered sensors, LEDs, or small displays in DIY projects.
Portable gadget chargers from 9V/12V batteries.
Robotics and automation modules requiring stable low-voltage rails.
Development kits and hobbyist electronics.
Note: Do not exceed 1A output to prevent overheating—monitor with a heatsink for continuous high loads.
