USB 5V to 4V-12V 5W Stepless Fan Speed Controller Governor Module

USB 5V to 4V-12V 5W Stepless Fan Speed Controller Governor Module is a plug-in USB buck-boost voltage regulator designed specifically for stepless air-volume and speed control of 5V, 9V, and 12V DC cooling fans. Equipped with a male USB Type-A input plug, a female USB Type-A output socket, 2-pin +/- solder pads, and a rotary potentiometer knob with a click-OFF switch, it converts a standard 5V USB input into a smoothly adjustable 4.0V to 12.0V DC output (up to 5W) to either quiet down noisy 5V USB fans or overdrive 5V/12V fans for maximum airflow.

Key Features:

• Wide 4.0V to 12.0V Stepless Buck-Boost Output: Steps a 5V USB input down to 4.0V for whisper-quiet night operation or boosts it up to 12.0V to run 12V PC case fans at full speed from any 5V USB port.
• Rotary Knob with Built-In Click Power Switch: Turn clockwise to click the fan ON and smoothly ramp speed from 4V to 12V; turn fully counterclockwise to click the fan completely OFF.
• Plug-and-Play USB-A Male to Female Passthrough: Plugs directly between a 5V USB charger/power bank and any standard USB desk fan—zero wiring required.
• Upgrades 2-Speed Fans to Infinite Speed Control: Put a 2-speed USB fan into Gear 1 and adjust airflow infinitely via the rotary knob.
• Auxiliary +/- Solder Pads: Also provides VOUT+ and VOUT- pads on the PCB for wiring bare 2-wire 5V/12V cooling fans directly.

Technical Specifications:

• Input Supply Voltage: 5.0V DC (4.5V to 6.0V via Male USB Type-A Plug or Micro-USB)
• Adjustable Output Voltage Range: 4.0V to 12.0V DC Stepless Buck-Boost
• Rated Output Power: 5.0W Max (e.g. 5V at 1.0A, 9V at 0.5A, 12V at 0.4A)
• Output Connectors: Female USB Type-A Socket + 2-Pin +/- Solder Pads
• Switch Function: Integrated Rotary Potentiometer Click-OFF Switch

Mechanical Specifications:

• PCB Material: FR-4 Double-Sided Blue Fiberglass Board
• Control Knob: Knurled Plastic Rotary Shaft Knob

Dimensions:

• Length: 50 mm (Including USB Plug)
• Width: 18 mm
• Height: 14 mm
• Weight: ~10 g

Pinout and Wiring:

• USB-A Male Input: Insert into a 5V USB power bank, laptop, or phone charger.
• USB-A Female Output: Plug in your USB desk fan (Important: If using a 2-speed/3-speed USB fan that has an internal boost board, keep the fan on Gear 1 so you don’t double-boost and burn the fan motor!).
• + / – Solder Pads: Optional direct wire connection to a 12V PC cooling fan (≤0.4A / 5W).

Datasheet Reference:

• Converter Topology: SEPIC Buck-Boost Switching Regulator with Rotary Potentiometer Feedback

Commonly Used in:

• 5V USB Desk Fan & Clip Fan Stepless Speed Control
• Running 12V 80mm / 120mm PC Case Fans from a 5V USB Port
• Router, Set-Top Box, and Laptop Cooling Pad Airflow Tuning
• 5V–12V LED Strip Brightness Dimming (≤5W)

Applications:

• Lets you run a standard 12V 80mm/120mm computer cooling fan directly from a 5V USB port on your Wi-Fi router, TV box, or Raspberry Pi while dialing in the exact balance of airflow and silence.
• Converts single-speed 5V USB fans into stepless variable-speed fans with a convenient click-OFF knob.
• Dims small 5V–12V USB LED reading lamps smoothly.

Equivalent Models:

• DC-DC USB 5V to 1.2V-24V Adjustable Buck-Boost Power Regulator Module: Includes a 3-digit LED voltmeter display and wider 1.2V–24V output range (3W).

Package Includes:

• 1 × USB 5V to 4V-12V 5W Stepless Fan Speed Controller Governor Module