The MT3608 is a popular step-up (boost) DC-DC converter IC that can efficiently convert lower voltages (like 5V from USB) to 12V. Here’s how to create a 12V boost converter using the MT3608 that plugs into a USB port.
For Full Project:
https://electronicsworkshops.com/2025/01/27/12v-boost-converter-usb-plug-using-mt3608/
📷12V Boost Converter USB Plug Using MT3608
MT3608The MT3608 is a constant frequency, current mode step-up converter typically used in small, low-power applications. It’s designed to boost lower voltages to higher voltages efficiently.
Key Features:Integrated 80mΩ Power MOSFETInput Voltage: 2V to 24VAdjustable Output Voltage: up to 28VFixed Switching Frequency: 1.2MHz, which allows for smaller and lower cost capacitors and inductors.Internal 4A Switch Current LimitAutomatic Pulse Frequency Modulation (PFM) Mode at Light Loads for higher efficiencyInternal soft-start to limit inrush currentThermal overload protectionAvailable in a small 6-Pin SOT-23 packageEfficiency up to 97%
ApplicationsBattery-powered equipment (portable speakers, digital cameras)Set-top boxesLCD bias supplyDSL and cable modems and routersNetworking cards powered from PCI or PCI express slotsLED driversPower modulesMedical Equipment
Key SpecificationsInput Voltage: 2V – 24VAdjustable Output Voltage: up to 28VSwitching Frequency: 1.2 MHzMaximum Output Current: 2A (though sustained use at 1A is recommended by some sources)Operating Temperature: -40°C to +85°
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Circuit DescriptionUSB Input (5V) → MT3608 Boost Converter → Adjust to 12V Output
The USB plug provides 5V input to the MT3608.
The MT3608 steps this up to 12V.
The output can power small 12V devices like LED strips, relays, fans, routers (low current), or Arduino shields
📷Circuit Diagram MT3608
USB Connection:
- Connect the USB plug’s +5V (usually red wire) to the input of your circuit
- Connect the USB ground (usually black wire) to your circuit ground
- USB Connection:Connect the USB plug’s +5V (usually red wire) to the input of your circuitConnect the USB ground (usually black wire) to your circuit ground
Input Filtering:
- Add a 10μF capacitor between input +5V and ground
- Input Filtering:Add a 10μF capacitor between input +5V and ground
MT3608 Connections:
- Vin pin to USB +5V
- GND pin to USB ground
- SW pin to inductor
- FB pin to voltage divider
- MT3608 Connections:Vin pin to USB +5VGND pin to USB groundSW pin to inductorFB pin to voltage divider
Output Section:
- Connect the inductor to the anode of the Schottky diode
- Cathode of diode is your 12V output
- Add output capacitor (22μF) between 12V and ground
- Output Section:Connect the inductor to the anode of the Schottky diodeCathode of diode is your 12V outputAdd output capacitor (22μF) between 12V and ground
Feedback Voltage Divider:
- Calculate resistors for 12V output (FB voltage is typically 0.6V)
- R1 = (Vout/Vfb – 1) × R2
- R1=62k R2= 3.3k
- Feedback Voltage Divider:Calculate resistors for 12V output (FB voltage is typically 0.6V)R1 = (Vout/Vfb – 1) × R2R1=62k R2= 3.3k
Gerber_allpcb_MT3608_12V_BoostConverterPlug_v1.0_2025-05-01Download
Bill Of MaterialsBOM_allpcb_2025-05-01-1Download
Pick And Place FilePickAndPlace_MT3608_12V_BoostConverterPlug_v1.0_2025-05-01Download
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Safety Considerations- Double-check polarity of all components
- Avoid short circuits on the output
- Don’t exceed USB current limits (typically 500mA for standard USB)
- The output voltage can be adjusted by changing the feedback resistors
This simple circuit will allow you to power 12V devices from a standard USB port, useful for small electronics projects or low-power 12V devices.
For Full Project:
https://electronicsworkshops.com/2025/01/27/12v-boost-converter-usb-plug-using-mt3608/
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