--- product_id: 142225846 title: "9V/12V/24V to 5V USB Step Down Power Module DC-DC 7.5V-28V to 5V 3A Precise Vehicle Charger Buck Voltage Converter Module 4Pcs" brand: "comidox" price: "£7.90" currency: GBP in_stock: true reviews_count: 6 url: https://www.desertcart.co.uk/products/142225846-9v-12v-24v-to-5v-usb-step-down-power-module store_origin: GB region: United Kingdom --- # 96% efficiency max 3A stable 5V output -40°C to 85°C wide temp 9V/12V/24V to 5V USB Step Down Power Module DC-DC 7.5V-28V to 5V 3A Precise Vehicle Charger Buck Voltage Converter Module 4Pcs **Brand:** comidox **Price:** £7.90 **Availability:** ✅ In Stock ## Summary > 🔌 Power your devices like a pro — never run low, always stay connected! ## Quick Answers - **What is this?** 9V/12V/24V to 5V USB Step Down Power Module DC-DC 7.5V-28V to 5V 3A Precise Vehicle Charger Buck Voltage Converter Module 4Pcs by comidox - **How much does it cost?** £7.90 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/142225846-9v-12v-24v-to-5v-usb-step-down-power-module) ## Best For - comidox enthusiasts ## Why This Product - Trusted comidox brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Robust 5V/3A Output:** Delivers a reliable 5V output at 3A peak (2A continuous), perfect for charging your mobile devices on the go without compromise. - • **User-Friendly Operation:** Equipped with a clear LED indicator and USB interface for easy monitoring and plug-and-play convenience. - • **Compact & Durable Design:** Sleek 42x16x5mm footprint built to withstand extreme temperatures from -40°C to 85°C, ensuring longevity in any environment. - • **Wide Input Voltage Range:** Supports 7.5V to 28V input, seamlessly adapting to 9V, 12V, or 24V vehicle power systems for versatile use. - • **Ultra-Efficient Power Conversion:** Harness up to 96% energy transfer with advanced synchronous rectification IC for minimal loss and maximum performance. ## Overview This 4-pack USB step-down buck converter modules efficiently transform 7.5V-28V DC input into a stable 5V output at up to 3A, ideal for vehicle and portable device charging. Featuring a high-performance synchronous rectification IC, it achieves up to 96% efficiency, operates reliably across a wide temperature range (-40°C to 85°C), and includes LED indicators for easy status monitoring. Compact and versatile, these modules are essential for professionals seeking dependable power conversion on the move. ## Description How To create the correct voltages: 1. Connect pins 2 and 3 to ground, pin 4 with 27k resistors. 2. Connect pin 1-2 with a 39k resistor for 2.00 volts output. 3. Connect pin 1-3 with a 22k resistor for 2.75 volts output. Note: Manual measurement, with small error. Please check size in detail before purchase. Real colors may slightly differ from the pictures, as it depends on specific monitor settings and light brightness. We highly appreciate all customers opinions to improve the selling, also if anything you unsatisfied, please contact us for probable best solution. Package Includes: 4Pcs ## Features - USB Step-Down Buck Converter, 7.5V-28V wide input voltage, output 5V/3A max, 2A for long time work. - Adopting high-performance synchronous rectification IC, transfer efficiency up to 96%. - With LED indicator, USB interface, convenient to operate. - Can be used for mobile power, mobile phones, and tablets etc. digital device, as a 5V stable voltage-stabilized power supply. - Size:42mm*16mm*5mm(L*W*H)/1.65*0.63*0.19inch,switching frequency: 1.5MHZ(Max)Typical 1MHZ,working temperature: -40°C-+85°C. ## Product Details - **Brand:** Comidox - **Power Source:** Corded Electric - **Model Name:** CP209 - **Product Dimensions:** 1.65"L x 0.63"W x 0.2"H - **Input Voltage:** 28 Volts ## Images ![9V/12V/24V to 5V USB Step Down Power Module DC-DC 7.5V-28V to 5V 3A Precise Vehicle Charger Buck Voltage Converter Module 4Pcs - Image 1](https://m.media-amazon.com/images/I/61dvHucXehL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good value. Works well. *by M***D on March 25, 2025* These did the job. I used them for an art project with an Arduino. They were a good value and the voltage worked correctly. ### ⭐⭐⭐⭐⭐ Excelente producto. *by E***A on March 25, 2025* Cumple con lo indicado. Llegó a tiempo el producto. ### ⭐⭐⭐⭐⭐ Great when used as designed *by N***R on October 5, 2019* This is a wonderful little circuit, It’s only about .75”x.75” and if you connect it to DC power source of 7.5 volts or more you’ll have an instant USB charger. Using a couple surplus connectors, scrap wire and pieces of PVC pipe I made a dual outlet USB charger, powered by a Lithium battery from a cordless drill. It took about an hour, not counting waiting for the paint to dry.When used for their designed purpose these things are great. A previous reviewer tried using them “off label” and unfairly rated them poorly. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/142225846-9v-12v-24v-to-5v-usb-step-down-power-module](https://www.desertcart.co.uk/products/142225846-9v-12v-24v-to-5v-usb-step-down-power-module) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-17*