Can I use this module to step down a 12V car battery to charge my phone?

Yes, the 5-24V to 5V 3A USB Step-Down Converter Module is perfect for automotive applications. You can safely wire the input pads to your car's 12V electrical system, and the module will step the voltage down to a stable 5V, allowing you to charge your smartphone or power a dashcam via the USB port.

Is this step-down module better than a standard linear voltage regulator?

Absolutely. The 5-24V to 5V USB Step-Down Module is a switching buck converter, which operates at up to 96% efficiency. A standard linear regulator (like an LM7805) burns off excess voltage as pure heat, making it highly inefficient and prone to overheating when dropping 24V down to 5V.

How do I wire the input power to this 5-24V to 5V converter?

You will need to use a soldering iron to attach your input power wires to the designated positive (IN+) and negative (IN-) solder pads located on the back or side of the PCB. Always ensure your input power is disconnected before soldering to prevent short circuits.

Can I get technical advice for my DIY project at your Sham Shui Po store?

Yes, you certainly can! Sun Cheong Computer Co. Ltd. encourages makers to build and experiment. You can bring your circuit diagrams and components to our Sham Shui Po physical store, and our technical staff will help you verify your wiring and select the right step-down modules for your specific project.

What happens if I draw the maximum 3A current continuously?

While the 5-24V to 5V 3A USB Step-Down Converter Module can handle a 3A peak output, drawing 3A continuously will generate significant heat. For long-term continuous operation, we recommend keeping the load at or below 2A, or adding a small adhesive heatsink to the main IC chip to prevent the overtemperature protection from triggering.

5-24V to 5V 3A USB Step-Down Module

Name: 5-24V to 5V 3A USB Step-Down Module | DIY Buck Converter
Brand: Sun Cheong Computer Company Limited
SKU: 21PS002289
Price: 63.0 TWD
Availability: OutOfStock

Short Product Description

Need a stable 5V USB power source from a higher voltage battery? The 5-24V to 5V 3A USB Step-Down Converter Module efficiently drops 9V, 12V, or 24V inputs down to a safe, continuous 5V output for charging smartphones and powering STEM electronics. Featuring a high 96% conversion efficiency and built-in overcurrent protection, this compact 38x16mm buck converter is perfect for custom car chargers, solar power banks, and robotics projects. Need help wiring your custom power circuit? 新昌電腦有限公司 (Sun Cheong Computer Co. Ltd.)has over 20 years of electronic component expertise. Visit our Sham Shui Po physical store for instant pickup and expert DIY technical advice!

Key Features

Wide Input Range: Accepts DC voltages from 5V up to 24V (max 36V), making it compatible with 9V batteries, 12V car systems, and 24V industrial rails.
Stable 5V USB Output: Features a standard female USB Type-A port that delivers a fixed, regulated 5V for safe device charging.
High Conversion Efficiency: Achieves up to 96% efficiency via a 150KHz switching frequency, drastically reducing heat generation and power waste.
Heavy-Duty Current: Supports a maximum output of 3A and a reliable 2A for long-term continuous operation.
Comprehensive Protections: Integrated overcurrent, overtemperature, and short-circuit shutdown mechanisms protect your electronics.
Ultra-Compact Footprint: Measures just 38 x 16 x 5mm and weighs only 6g, easily fitting into tight 3D-printed enclosures or car dashboards.

Full Product Description

Reliable DC-DC Power Conversion for DIY Projects

The 5-24V to 5V 3A USB Step-Down Converter Module provides a highly stable and efficient way to power 5V USB devices from a wide range of higher voltage sources. Whether you are building a custom solar-powered charging station, hardwiring a dashcam to your 12V car battery, or designing a robotics project, relying on unstable power can damage your sensitive electronics. This compact buck converter ensures your devices receive a clean, regulated 5V output, protecting your smartphones, tablets, and microcontrollers from voltage spikes.

High-Efficiency 3A USB Output

This USB Step-Down Converter Module utilizes advanced switching technology to deliver up to 3A of maximum current with an outstanding 96% conversion efficiency. Unlike older linear regulators that waste excess voltage as heat, this 150KHz switching buck converter minimizes power loss, ensuring your batteries last longer. It comfortably sustains a 2A continuous draw, making it perfectly capable of fast-charging modern power-hungry USB devices without breaking a sweat.

Built-In Safety Protections

Safety is paramount when designing custom power supplies, and the 5-24V to 5V USB Step-Down Module comes fully equipped with integrated reliability safeguards. The onboard circuitry includes overcurrent protection, overtemperature protection, and a short-circuit shutdown feature. These built-in defenses automatically cut off power if a fault is detected, safeguarding both the tiny 6g converter board and your expensive connected devices from permanent electrical damage.

💡 Pro Tip from Our Technicians

"When soldering the input wires to the 5-24V to 5V 3A USB Step-Down Converter Module, you must absolutely double-check your polarity! Reversing the positive and negative input wires will instantly destroy the buck converter chip. Additionally, if your DIY project requires pulling the maximum 3A current continuously, we highly recommend attaching a small copper heatsink to the main chip to ensure optimal thermal dissipation. If you are a STEM student building a custom power bank and need help selecting the right gauge wires or soldering equipment, drop by our Sham Shui Po store! Our team at 新昌電腦有限公司 (Sun Cheong Computer Co. Ltd.) loves helping makers debug their DIY power circuits."

Technical Specifications

Product Type: DC-DC Step-Down (Buck) Converter Module
Input Voltage: 5V - 24V DC (Absolute Maximum 36V)
Output Voltage: 5V DC (Fixed)
Output Current: 3A Maximum (2A for long-term continuous use)
Conversion Efficiency: Up to 96%
Switching Frequency: 150KHz
Output Interface: Standard USB Type-A Female
Protection Features: Overcurrent, Overtemperature, Short-circuit shutdown
Operating Temperature: -40°C to +85°C
Dimensions: 38mm x 16mm x 5mm
Weight: 6g

Delivery Options

Local delivery within Hong Kong and in-store pickup.
Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
In-store pickup details (location and time) will be confirmed by email or phone message.
Delivery times are estimates and may be affected by weather or unforeseen circumstances.

FAQ Section

Can I use this module to step down a 12V car battery to charge my phone?Yes, the 5-24V to 5V 3A USB Step-Down Converter Module is perfect for automotive applications. You can safely wire the input pads to your car's 12V electrical system, and the module will step the voltage down to a stable 5V, allowing you to charge your smartphone or power a dashcam via the USB port.
Is this step-down module better than a standard linear voltage regulator?Absolutely. The 5-24V to 5V USB Step-Down Module is a switching buck converter, which operates at up to 96% efficiency. A standard linear regulator (like an LM7805) burns off excess voltage as pure heat, making it highly inefficient and prone to overheating when dropping 24V down to 5V.
How do I wire the input power to this 5-24V to 5V converter?You will need to use a soldering iron to attach your input power wires to the designated positive (IN+) and negative (IN-) solder pads located on the back or side of the PCB. Always ensure your input power is disconnected before soldering to prevent short circuits.
Can I get technical advice for my DIY project at your Sham Shui Po store?Yes, you certainly can! Sun Cheong Computer Co. Ltd. encourages makers to build and experiment. You can bring your circuit diagrams and components to our Sham Shui Po physical store, and our technical staff will help you verify your wiring and select the right step-down modules for your specific project.
What happens if I draw the maximum 3A current continuously?While the 5-24V to 5V 3A USB Step-Down Converter Module can handle a 3A peak output, drawing 3A continuously will generate significant heat. For long-term continuous operation, we recommend keeping the load at or below 2A, or adding a small adhesive heatsink to the main IC chip to prevent the overtemperature protection from triggering.

Target Users / Applications

Car & Motorcycle Modifiers: Hardwiring 12V vehicle batteries to create hidden, dedicated 5V USB ports for dashcams, GPS units, or passenger charging.
Solar Power DIYers: Stepping down the fluctuating 18V-24V output of raw solar panels to a safe, regulated 5V to build custom off-grid power banks.
STEM Robotics Students: Converting 9V or 12V motor battery packs down to 5V to safely power Arduino boards, Raspberry Pis, and USB sensors on a single chassis.

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5-24V to 5V 3A USB Step-Down Converter Module | DIY Buck Board