The CA-1235 Adjustable DC-DC Buck Converter Module is a compact, versatile step-down voltage regulator designed to provide a selectable fixed output voltage from a higher DC input. With six preset output voltages — 1.25V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V — this module eliminates the need for external adjustment potentiometers, making it an ideal solution for powering a wide range of electronic devices, sensors, and microcontroller projects.
At the heart of the module is a high-efficiency synchronous buck converter that steps down input voltages from 5V to 16V DC to the selected output voltage. The conversion efficiency reaches up to 92%, minimizing power loss and heat generation compared to linear regulators. The output voltage is selected via onboard solder jumpers or a selector switch, allowing quick configuration without the need for a multimeter or screwdriver.
The wide input voltage range of 5V to 16V DC makes the module compatible with a broad range of power sources including:
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5V USB power (for 3.3V, 2.5V, 1.8V, 1.5V, 1.25V outputs)
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12V car and marine systems
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9V and 12V battery packs
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2S–3S lithium batteries (7.4V–11.1V)
The selectable output voltages make this module particularly versatile:
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1.25V — For low-voltage digital cores and specialized ICs
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1.5V — For DDR memory and low-power logic
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1.8V — For FPGA cores, CPLDs, and low-voltage peripherals
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2.5V — For interface logic and analog circuits
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3.3V — For ESP32, ESP8266, STM32, and modern microcontrollers
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5V — For Arduino, sensors, and standard logic circuits
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 compact PCB design with mounting holes allows easy integration into equipment enclosures, project boxes, and control panels.
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 module is widely used in microcontroller projects, FPGA/CPLD development, IoT devices, sensor networks, embedded systems, industrial control, portable electronics, and any application requiring a stable, selectable low-voltage supply from a higher input voltage.
Important Note: The module requires the input voltage to be higher than the selected output voltage by at least 1.5V for proper regulation. For example, a 5V input is suitable for 3.3V output, but a 12V input is ideal for 5V output. Always verify the input voltage and current ratings match your application.
Whether you are powering an FPGA core, adding a 1.8V rail to a mixed-voltage system, or building a custom embedded device, the CA-1235 Adjustable DC-DC Buck Converter Module provides a reliable, versatile solution. It is suitable for individual makers, engineers, and businesses purchasing in bulk for product development or industrial applications.
Features
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Six selectable output voltages — 1.25V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V
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Wide input voltage range — 5V to 16V 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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Solder jumper or selector switch — Quick voltage selection without tools
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Compact form factor — With mounting holes for easy installation
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Built-in protection — Overcurrent, thermal shutdown, and short-circuit protection
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Wide application range — Microcontrollers, FPGA/CPLD, IoT, sensors, embedded systems
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Module Type | Step-down (buck) converter |
| 2 | Model | CA-1235 |
| 3 | Output Voltage | 1.25V / 1.5V / 1.8V / 2.5V / 3.3V / 5V (selectable) |
| 4 | Input Voltage Range | 5V – 16V DC |
| 5 | Maximum Output Current | Variant dependent (typically 2A–3A) |
| 6 | Conversion Efficiency | Up to 92% |
| 7 | Protection | Overcurrent, thermal shutdown, short-circuit |
| 8 | Module Dimensions | Compact PCB with mounting holes |
