MP2307 5V to 24V Buck Converter

Introduction

If you've ever needed to step down a higher DC voltage say, from a 12V or 24V source down to a clean, stable 5V rail without burning power as heat, a linear regulator just won't cut it efficiently. That's where the MP2307 buck converter comes in. In this project blog, I'll walk through exactly how I designed, built, and tested a 5V output buck converter using the MP2307 switching regulator IC covering the schematic, component selection math, PCB considerations, and bench-tested performance numbers.

For Full Project

https://electronicsworkshops.com/mp2307-5v-buck-converter-a-complete-project-build-guide/

What Is the MP2307?

The MP2307 is a monolithic synchronous buck regulator manufactured by Monolithic Power Systems (MPS). It integrates a pair of low-resistance 100mΩ power MOSFETs on-chip, which is what allows it to deliver up to 3A of continuous load current across a wide input voltage range — without needing an external Schottky diode. That low on-resistance is a big part of why this chip runs cool and efficient even at full load.

Key headline specs that make it a popular choice for hobbyist and professional power supply projects alike:

Input voltage range: 4.75V to 23V

Output current: up to 3A continuous

Integrated MOSFETs: 100mΩ on-resistance, synchronous (high-side + low-side) — no external diode needed

Fixed switching frequency: 340kHz

Output voltage: adjustable via a resistor divider (down to 0.925V reference), or fixed-output variants are available

Package: typically available in SO8 / TSOT23-8 style packages, useful for moderately compact builds

Because the MOSFETs are synchronous and low-resistance, conduction losses stay low and efficiency commonly lands in the 90–95% range depending on input/output voltage and load — a massive improvement over a linear regulator, which simply dissipates the voltage difference as heat.

Why Build a Buck Converter Instead of Using a Linear Regulator

This is usually the first question that comes up, so let's settle it with the math. Say you have a 12V input and need 5V at 2A output.

Linear regulator (e.g., LM7805): Power dissipated = (Vin − Vout) × Iout = (12 − 5) × 2 = 14W wasted as heat

MP2307 buck converter at ~92% efficiency: Output power = 5 × 2 = 10W. Input power ≈ 10 / 0.92 ≈ 10.87W. Power lost ≈ 0.87W

That's the difference between needing a large heatsink and fan versus a small IC that barely gets warm. For battery-powered or thermally constrained projects, this isn't optional — it's essential.

Project Goals and Specifications

Circuit Design and Schematic

The MP2307 reference application circuit follows a classic synchronous buck topology. The core building blocks are:

Input bulk capacitor (Cin) — buffers the input rail and supplies the pulsed current the switching MOSFET demands.

MP2307 IC — handles switching, current limiting, soft-start, and thermal shutdown internally.

Inductor (L1) — stores and releases energy each switching cycle, smoothing the pulsed switch-node voltage into a DC current.

Output capacitor (Cout) — filters the inductor ripple current into a clean DC output voltage.

Feedback resistor divider (R1, R2) — sets the output voltage by feeding a scaled-down version of Vout back to the FB pin, compared against the internal 0.925V reference.

Compensation network (Rc, Cc) — stabilizes the control loop, since the MP2307 uses voltage-mode control with external compensation.

Bootstrap capacitor (Cboot) — drives the high-side MOSFET gate above the input rail.

The signal flow is straightforward: input power enters at Cin, gets chopped by the internal high-side/low-side MOSFETs at 340kHz, smoothed by the L1–Cout filter, and the resulting DC output is sampled by the feedback divider to keep the loop regulated at exactly 5V.

The MP2307 reference application circuit follows a classic synchronous buck topology. The core building blocks are: