Mini MP1584 DC-DC 3A Adjustable Buck Module - High Efficiency Step-Down Converter

Specifications

• Input Voltage: 4.5V to 28V DC.

• Output Voltage: 0.8V to 20V DC (Adjustable via on-board trim pot).

• Output Current: 3A (Peak), 1.8A (Continuous without additional cooling).

• Switching Frequency: 1.5MHz (High frequency allows for smaller components and lower ripple).

• Efficiency: Up to 96%.

• Output Ripple: < 30mV.

• Operating Temperature: -45°C to +85°C.

• Dimensions: 22mm x 17mm x 4mm (Ultra-miniature).

Key Applications & Projects

• Drones & RC Aircraft: Stepping down 3S or 4S LiPo batteries to a steady 5V for flight controllers.

• Portable IoT Devices: Maximising battery life in ESP32 or LoRa projects.

• Automotive Electronics: Converting 12V car battery power to 5V for USB charging or dash cams.

• LED Drivers: Providing efficient power for small high-brightness LED arrays.

Project Evolution

• Past Projects (Prerequisites): If you’ve used the LM7805 or LM317 linear regulators and noticed they get too hot to touch, you’ve reached the limit of linear technology.

• Feature Upgrade: The MP1584 moves you into Switch-Mode Power Supply (SMPS) territory. Because it "chops" the voltage at 1.5MHz rather than burning it off as heat, it allows you to shrink your project size by removing the need for heavy heatsinks.

• Effort/Requirements: Intermediate. You will need a multimeter to set the output voltage before connecting your load.

Virtual Technician & Wiring

⚠️ Critical Step: Before connecting your target device (like an Arduino or ESP32), connect your input power and use a screwdriver to turn the tiny brass screw on the potentiometer. Measure the output with a multimeter until it reaches your desired voltage.

Package Includes: 1 x  MP1584 DC-DC 3A Adjustable Buck Module

Frequently Asked Questions (FAQ)

• Can I step up voltage with this? No, this is a Buck (Step-Down) converter only. The input must be higher than the output.
• Is it normal for the module to get warm? At 1.5A+, it will get warm. At 3A, it requires a small heatsink or airflow.
• What is the minimum difference between input and output? Maintain at least a 1.5V difference for stable regulation.
• Does it have short-circuit protection? Yes, the MP1584 includes cycle-by-cycle over-current protection.
• Can I use this with a 24V industrial supply? Yes, it supports up to 28V input.
• Which way do I turn the screw to lower the voltage? Usually, counter-clockwise lowers the voltage, but always verify with a multimeter.
• Is the output voltage stable if the input voltage drops? Yes, as long as the input remains ~1.5V above the set output.
• Can I use this for audio projects? Yes; the high 1.5MHz frequency is well above the audible range, reducing noise interference.
• What happens if I reverse the input polarity? There is no reverse-polarity protection. Reverse wiring will likely damage the chip instantly.
• Can I parallel two modules for 6A output? Not recommended, as they will not share the load equally without complex balancing.
• Is it compatible with 3.3V logic? Yes, you can set the output to exactly 3.3V.
• What is the quiescent current? Very low, typically under 1mA, making it great for standby battery applications.
• Can it charge a Li-ion battery? It lacks constant-current (CC) control, so it is not a safe standalone battery charger.
• Does it come with header pins? This variant is usually sold as a bare PCB for direct wire soldering to save space.
• What is the "EN" pin on the chip? It stands for "Enable." It is pulled high by default; pulling it to ground will turn the output off.
• Is it 1.5MHz fixed frequency? Yes, which allows for much smaller output filters than 150kHz modules like the LM2596.
• Can I use it in a car (12V-14.4V)? Yes, it is very common for automotive USB projects.
• How do I mount such a small board? Most users use double-sided foam tape or solder it directly to a motherboard.
• What is the maximum efficiency? Around 96% when stepping down from 12V to 5V at moderate loads.
• Is the potentiometer fragile? It is a precision component. Use a proper jeweler's screwdriver and do not force it past its stops.