HW-140 Buck-Boost DC-DC Converter with LCD Display 4A
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Prices updated: 13 Oct 2026
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About this product
The HW-140 is a buck-boost DC-DC converter module with an adjustable output and an LCD that shows voltage, current and power in real time. It can step the voltage up or down, operates in constant-voltage or constant-current mode, and is rated for 4 A output.
Specifications
- Converter type
- Buck-Boost (step up/down)
- Output current
- 4 A
- Display
- LCD (voltage, current, power)
- Operating modes
- Constant voltage / constant current
- Protection
- Reverse protection
Frequently asked questions
When should I use a buck-boost converter instead of a standard buck converter?
Use a buck-boost converter when the input voltage may be above or below the required output, for example from a battery whose voltage drops as it discharges. A standard buck converter can only step the voltage down.
What does the LCD show?
The LCD displays the output voltage, output current and power in real time, which helps when setting the output and monitoring the load.
