The 3A Mini DC-DC Buck Converter Module is a compact, high-efficiency step-down regulator designed to provide a fixed 9V output from a higher DC input voltage. With a 3A maximum output current, it is an ideal solution for powering 9V devices, instruments, and circuits from a wide range of higher-voltage input sources including 12V batteries, 24V industrial supplies, and higher-voltage DC adapters.
At the heart of the module is a high-efficiency synchronous buck converter that steps down input voltages from 11V to 28V DC to a regulated 9V output. The conversion efficiency reaches up to 92%, minimizing power loss and heat generation compared to linear regulators. The 3A continuous output current provides ample power for demanding 9V loads, including multimeters, test instruments, audio devices, and portable electronics.
The module is designed for 9V fixed output operation, eliminating the need for external adjustment and simplifying integration. This makes it particularly well-suited for powering 9V devices where a stable, reliable 9V rail is essential — especially as a replacement for disposable 9V batteries in bench equipment and portable instruments.
The mini form factor is a key advantage of this module. Its compact size allows easy integration into space-constrained projects, equipment enclosures, and portable devices. The module features screw terminals or pin headers for secure input and output connections, with clearly labeled terminals for easy wiring. LED indicators provide visual feedback for power status.
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 wide input voltage range of 11V to 28V makes it compatible with a broad range of power sources, from 12V and 24V battery systems to industrial power supplies.
The module is widely used in multimeter power supplies, test and measurement instruments, audio equipment, portable electronics, embedded systems, industrial control, automotive electronics, and any application requiring a stable 9V supply from a higher input voltage.
Important Note: The module requires the input voltage to be higher than the output voltage (9V) by at least 2V for proper regulation. For example, a 12V input is ideal, but a 10V input would provide insufficient headroom. Always verify the input voltage and current ratings match your application.
Whether you are powering a multimeter from a 12V battery, adding a 9V rail to a 24V system, or building a custom instrument, the 3A Mini DC-DC Buck Converter Module provides a reliable, efficient solution. It is suitable for individual makers, engineers, and businesses purchasing in bulk for product development or industrial applications.
Features
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Fixed 9V output — No adjustment required, simplifying integration
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3A maximum output current — Ample power for 9V instruments and devices
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Wide input voltage range — 11V to 28V DC
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High efficiency — Up to 92% conversion efficiency
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Synchronous buck converter — Low heat generation, no external heat sink required
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Mini compact design — Space-saving form factor for constrained projects
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Built-in protection — Overcurrent, thermal shutdown, and short-circuit protection
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Wide application range — Multimeters, test instruments, audio devices, portable electronics
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Module Type | Step-down (buck) converter |
| 2 | Output Voltage | 9V DC (fixed) |
| 3 | Maximum Output Current | 3A |
| 4 | Input Voltage Range | 11V – 28V DC |
| 5 | Conversion Efficiency | Up to 92% |
| 6 | Output Voltage Accuracy | ±1% (typical) |
| 7 | Protection | Overcurrent, thermal shutdown, short-circuit |
| 8 | Module Dimensions | Mini compact PCB with mounting holes |
