JMX-FN03-V1.2 Small Rechargeable Mini Fan Circuit Board

JMX-FN03-V1.2 Small Rechargeable Mini Fan Circuit Board is a compact, highly integrated control module designed specifically for portable, battery-powered handheld and desktop fans. This versatile driver board combines lithium-ion battery charging management, multi-speed DC motor speed control, and status indicator logic onto a single lightweight printed circuit board. Consequently, engineers and technicians can quickly repair or build personal cooling devices without designing complex discrete circuitry. Integrated over-charge and over-discharge protection features safeguard the connected 3.7V lithium battery during daily operation. Furthermore, the single-button tactile interface simplifies user operation by cycling through power states and motor speed levels seamlessly. Therefore, you can rely on the JMX-FN03-V1.2 module to deliver efficient energy regulation and quiet motor control in custom rechargeable fan projects.

Key Features:

• Integrated Battery Charging: The board features onboard lithium-ion charge management that safely recharges 3.7V cell batteries via a standard Micro-USB or USB-C input interface.
• Multi-Speed Motor Control: It provides multi-level PWM (Pulse Width Modulation) output to drive small DC motors across 3 distinct speed settings.
• Single-Button Interface: Consequently, a single push button handles power toggling and speed selection for intuitive user control.
• Built-in Circuit Protection: Includes basic over-current and thermal cutoff protections to prevent damage to the battery cell and motor driver stage.
• LED Status Indicators: Dedicated status LEDs inform the user of charging progress, full battery state, and active power modes in real time.

Technical Specifications:

• Input Voltage (Charging): 5.0 V DC (±0.25 V via USB port)
• Compatible Battery Voltage: 3.7 V Nominal (4.2 V Peak fully charged Li-ion / 18650 cell)
• Output Voltage to Motor: ≈ 5 V, 7 V, and 9 V (Step-up PWM levels depending on speed setting)
• Maximum Charging Current: ≈ 500 mA to 800 mA
• Motor Drive Current: Up to 1.0 A Peak
• Operating Temperature Range: −10°C to +60°C
• Standby Current: ≤ 20 μA (Low quiescent drain in OFF state)

Mechanical Specifications:

• Board Material: Standard FR-4 Glass Reinforced Epoxy Laminate
• PCB Layer Count: 2-Layer (Double-Sided PCB)
• Mounting Options: Solder pads for battery, motor, and key switch leads
• USB Port Style: Surface-Mount Micro-USB / USB-C Female Connector

Dimensions:

• PCB Length: ≈ 35.0 mm
• PCB Width: ≈ 15.0 mm
• Total Height (including USB port): ≈ 6.5 mm
• Weight: ≈ 3.0 g

Pinout and Wiring:

• B+ (Battery Positive): Connect to the positive terminal (+4.2V max) of the 3.7V lithium-ion battery.
• B- (Battery Negative): Connect to the negative terminal (GND) of the 3.7V lithium-ion battery.
• M+ (Motor Positive): Connect to the positive lead of the small DC fan motor.
• M- (Motor Negative): Connect to the negative lead of the small DC fan motor.
• KEY / SW: Connections for an external momentary tactile push button if not using the onboard switch.
• Wiring Note: However, always ensure correct battery polarity prior to applying power to avoid permanent damage to the control IC.

Datasheet Reference:

• Download TP4056 / Charge Controller Reference Datasheet

Commonly Used in:

• Handheld Mini Fans: Serving as the main controller for portable USB-rechargeable personal cooling fans.
• Desktop Wireless Fans: Powering small rechargeable desk fans equipped with 18650 battery compartments.
• Neck Fans: Controlling dual-motor wearable neck fans requiring step-up speed modulation.

Applications:

• DIY Electronics Repair: Replacing burnt-out or defective driver boards in commercial rechargeable mini fans.
• Portable Air Circulation: Driving low-voltage DC brushless or brushed motors in custom enclosures.
• Battery Power Management: However, makers can also adapt this circuit to manage power for small low-current DC motor projects.

Equivalent Models:

• JMX-FN01-V1.0: An earlier single-speed variant of the same mini fan controller board series.
• FF-03-V2.1: A functionally similar 3-speed fan driver module with an integrated USB-C charging port.
• TP4056 + Boost Converter Combo: A discrete module combination that provides equivalent charging and speed regulation capabilities.

Package Includes:

• 1 x JMX-FN03-V1.2 Small Rechargeable Mini Fan Circuit Board