Multi Output Step-Down Converter – Input 18-24V and Output 3.3V, 5V, 12V
This is a fantastic project for makers, offering multiple output options of 3.3V, 5V, and 12V, with an input of 18-24V DC. This project is built around the MP2451 high-frequency (2Mhz) step-down switching regulator, ensuring efficient and reliable power conversion. For added convenience, a header connector is provided for outputs and input supply, while a power LED indicator ensures easy power status monitoring. This project is particularly well-suited for low-current applications, and its compact PCB design occupies a minimal footprint, making it ideal for space-constrained projects.
The output voltages of the three channels are set to 3.3V, 5V, and 12V using the following resistor combinations:
- 3V: R1 + R3
- 5V: R2 + R4
- 12V: R9 + R11
Users can modify the feedback divider resistor values to adjust the output voltages to meet their specific requirements. The output voltage range is adjustable from +0.8V to 0.8 x VIn. For the divider resistor formula, refer to the chip’s datasheet.
Features
- Input 18-24V DC
- Outputs 3.3V, 5V, 12V, Load Current 300mA Each (max 600mA per channel)
- On Board Power LED
- Header Connector for Outputs and Input
- 2MHz fixed Switching Frequency
- Internal Soft-Start
- Precision Current Limit Without Current Sensing Resistor
- Thermal shutdown
- PCB Dimensions 32.07 x 19.37 mm
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This is a fantastic project for makers, offering multiple output options of 3.3V, 5V, and 12V, with an input of 18-24V DC. This project is built around the MP2451 high-frequency (2Mhz) step-down switching regulator, ensuring efficient and reliable power conversion. For added convenience, a header connector is provided for outputs and input supply, while a power LED indicator ensures easy power status monitoring. This project is particularly well-suited for low-current applications, and its compact PCB design occupies a minimal footprint, making it ideal for space-constrained projects.
The output voltages of the three channels are set to 3.3V, 5V, and 12V using the following resistor combinations:
- 3V: R1 + R3
- 5V: R2 + R4
- 12V: R9 + R11
Users can modify the feedback divider resistor values to adjust the output voltages to meet their specific requirements. The output voltage range is adjustable from +0.8V to 0.8 x VIn. For the divider resistor formula, refer to the chip’s datasheet.
Features
- Input 18-24V DC
- Outputs 3.3V, 5V, 12V, Load Current 300mA Each (max 600mA per channel)
- On Board Power LED
- Header Connector for Outputs and Input
- 2MHz fixed Switching Frequency
- Internal Soft-Start
- Precision Current Limit Without Current Sensing Resistor
- Thermal shutdown
- PCB Dimensions 32.07 x 19.37 mm
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