The Mini 97.5% Efficiency DC-DC Step-Down Module is an ultra-compact, high-performance buck converter designed to deliver a stable 5V output from a 4V to 20V DC input with exceptional efficiency and minimal footprint. With a maximum output current of 3A, this module is an ideal solution for automotive applications, portable electronics, and space-constrained projects where clean, reliable 5V power is essential.
At the heart of the module is a high-efficiency synchronous buck converter that achieves an outstanding 97.5% conversion efficiency — significantly higher than typical buck converters. This translates to minimal power loss, reduced heat generation, and extended battery life in portable and automotive applications. The mini form factor makes this module one of the smallest 3A buck converters available, perfect for embedding into tight spaces.
The module accepts a wide input voltage range of 4V to 20V DC, making it compatible with a broad range of power sources including:
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Car and vehicle electrical systems (12V nominal, 13.8V–14.4V charging)
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2S–4S lithium battery packs (7.4V–14.8V)
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USB PD power sources (5V–20V)
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12V power adapters and solar systems
The 5V fixed output is ideal for powering:
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Car USB chargers and accessories
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Dash cameras and GPS devices
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Smartphones and tablets (charging via USB)
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Arduino and ESP32 projects in vehicles
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LED lighting and indicators
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Sensors and communication modules
The 3A maximum output current provides ample power for demanding 5V loads. The module includes built-in protection circuits including overcurrent protection, thermal shutdown, and short-circuit protection, ensuring safe and reliable operation even under fault conditions.
The mini form factor with mounting holes allows easy integration into equipment enclosures, project boxes, and portable devices. The module features solder pads or pin headers for secure input and output connections, with clearly labeled terminals for easy wiring.
The module is widely used in automotive electronics, car USB chargers, portable electronics, microcontroller projects, IoT devices, LED lighting, and any application requiring a high-efficiency, compact 5V supply from a higher input voltage.
Important Note: The module requires the input voltage to be higher than the output voltage (5V) by at least 1V for proper regulation. For example, a 6V input provides the minimum headroom, while 12V or 20V inputs provide optimal efficiency. Always verify the input voltage and current ratings match your application.
Whether you are building a car USB charger, powering an ESP32 from a vehicle’s 12V system, or adding a compact 5V rail to a portable device, the Mini 97.5% Efficiency DC-DC Step-Down Module provides a reliable, ultra-efficient solution. It is suitable for individual makers, engineers, and businesses purchasing in bulk for product development or automotive applications.
Features
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97.5% conversion efficiency — Industry-leading efficiency minimizes power loss and heat
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Ultra-compact mini form factor — One of the smallest 3A buck converters available
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Wide input voltage range — 4V to 20V DC
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3A maximum output current — Ample power for demanding 5V loads
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Fixed 5V output — No adjustment required, simplifying integration
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Synchronous buck converter — Low heat generation, no external heat sink required
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Built-in protection — Overcurrent, thermal shutdown, and short-circuit protection
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Automotive compatible — Ideal for car and vehicle 12V systems
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Wide application range — Car USB chargers, dash cameras, Arduino projects, LED lighting
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Module Type | Step-down (buck) converter |
| 2 | Conversion Efficiency | Up to 97.5% |
| 3 | Input Voltage Range | 4V – 20V DC |
| 4 | Output Voltage | 5V DC (fixed) |
| 5 | Maximum Output Current | 3A |
| 6 | Form Factor | Mini compact design |
| 7 | Protection | Overcurrent, thermal shutdown, short-circuit |
| 8 | Module Dimensions | Ultra-compact PCB with mounting holes |
