DC-DC 6-18V to 5V 3A Step Down Buck Converter Module with USB Output

Step down input voltages efficiently with the DC-DC 6-18V to 5V 3A USB Output Buck Converter Module. Designed to convert wide direct-current input ranges ( $6 ext{V}$ to $18 ext{V}$ ) down to a stable $5 ext{V}$ output, this compact step-down regulator delivers up to 3A of continuous output current. Equipped with a standard USB Type-A output port, high-efficiency synchronous rectification, and built-in over-voltage and short-circuit protection, it is the ideal power management solution for DIY solar chargers, automotive USB power taps, and battery-powered microcontroller projects.

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Tags DC DC Buck Converter 12V to 5V 3A Step Down Module USB Buck Converter 5V 3A Power Supply Module DC 6-18V Step Down Board Car USB Charger Module Solar 5V Regulator Module Arduino USB Power Supply

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Product Details :

The DC-DC 6-18V to 5V 3A USB Output Step Down Buck Converter Module is a high-efficiency power regulation solution engineered to provide a stable, clean $5 ext{V}$ supply from varying high-voltage DC sources. Unlike traditional linear regulators (such as the LM7805) that waste excess voltage as heat, this module utilizes high-frequency switching technology to achieve conversion efficiencies up to 96%. This allows it to handle higher load currents without requiring large external heat sinks.

The module features an integrated USB Type-A Female receptacle along with direct solder pads for input wiring ( $V_{IN}+$ and $GND$ ). Powered by a wide $6 ext{V}$ to $18 ext{V}$ input range, it easily runs off standard $12 ext{V}$ car batteries, $3 ext{S}$ Lithium Polymer (LiPo) battery packs, or solar panels. Dedicated output voltage compensation and low-ripple filtering ensure safe, continuous power delivery for smartphones, single-board computers (like Raspberry Pi or Arduino), and 5V sensor arrays.

Key Features and Benefits

High Efficiency Conversion: Advanced switching buck technology offers up to 96% energy conversion efficiency, maintaining low thermal output even under heavy loads.
Standard USB Type-A Interface: Pre-fitted with a USB socket for immediate plug-and-play charging of USB-powered devices and development boards.
Wide Input Voltage Range: Accepts any DC input voltage from $6 ext{V}$ up to $18 ext{V}$ , making it compatible with $9 ext{V}$ batteries, $12 ext{V}$ vehicle networks, and solar power rigs.
Robust 3A Current Delivery: Supplies up to $3 ext{A}$ max output (continuous $2 ext{A}$ load without active cooling), providing ample power for power-hungry devices.
Integrated Hardware Protections: Features output over-voltage protection, reverse-polarity protection, thermal shutdown, and output short-circuit defense to keep connected devices safe.

Technical Specifications

Feature Component	Specification Details
Module Type	Non-isolated DC-DC Step-Down (Buck) Converter
Input Voltage Range ( $V_{IN}$ )	$ext{DC } 6.0 ext{V} - 18.0 ext{V}$
Output Voltage ( $V_{OUT}$ )	$ext{DC } 5.0 ext{V} pm 1%$ (Regulated)
Maximum Output Current	$3.0 ext{A}$ Max (Recommended continuous load: $2.0 ext{A}$ )
Conversion Efficiency	Up to $96%$ (Varies depending on $V_{IN}$ and current draw)
Switching Frequency	$500 ext{ kHz}$ Nominal
Output Ripple	$< 30 ext{ mV}$
Input Connection	Solder Pads ( $V_{IN}+$ , $GND$ )
Output Connection	Standard USB Type-A Female Socket
Operating Temperature	$-40^circ ext{C to } +85^circ ext{C}$

How to Wire & Configure

1. Input Connections:

Solder your DC power supply wires directly to the marked input pads on the PCB:
- $V_{IN}+$ : Connect to the positive terminal of your DC power source ( $6 ext{V}$ to $18 ext{V}$ ).
- GND / $V_{IN}-$ : Connect to the negative terminal (Common Ground) of your DC power source.

2. Output Operation:

Once the input supply is powered on, check that the onboard power LED indicator illuminates.
Plug your USB charging cable or device directly into the standard USB Type-A port to draw regulated $5 ext{V}$ power.

Safety Warning: Ensure the input voltage does not exceed $18 ext{V DC}$ to prevent permanent damage to the onboard switching IC and filtering capacitors.

Applications

Automotive USB Charging Ports: Step down a car's $12 ext{V}$ vehicle battery system to charge phones, dashcams, and GPS devices.
DIY Solar Charging Stations: Regulate the fluctuating output of $12 ext{V}$ solar panels to safely charge $5 ext{V}$ USB power banks.
Robotics & Microcontroller Power: Provides a clean, regulated $5 ext{V}$ rail for Arduino, ESP32, or Raspberry Pi boards powered by $2 ext{S}$ or $3 ext{S}$ LiPo battery setups.
Portable Power Packs: Convert high-voltage battery banks into multi-port portable emergency USB charging stations.