By MT3608 module 483
Application Scenarios of MT3608
How to Adjust Output Voltage with a Multimeter
When we say “MT3608 module,” we mean a ready-to-use circuit board that uses the MT3608 chip and includes the needed external components (such as inductor, capacitor, potentiometer, resistor, Schottky diode).
Its main function is to raise a low DC input voltage (for example 2V–24V) to a higher DC output voltage (up to 28V). It can also provide a good output current.
The MT3608 module has these main features:
MT3608 works with the Boost (升压) topology. It raises voltage through a two-stage cycle:
Energy-storage stage:
The internal switch turns ON. Current flows through the inductor, and the inductor stores energy as a magnetic field. At this time, the output capacitor supplies the load.
Energy-release stage:
The internal switch turns OFF. The inductor current cannot change suddenly, so it creates an induced voltage. This voltage adds to the input voltage and sends power through the synchronous rectifier to the output capacitor and the load. This produces a voltage higher than the input.
The chip repeats this process at 1.2MHz. The feedback pin monitors the divided output voltage and compares it with the internal 0.6V reference. Then the chip adjusts the duty cycle to keep the output voltage stable.
Common MT3608 modules on the market have standard physical and electrical specs:
| Parameter Type | Description |
| Module Model | MT3608 Boost Converter Module |
| Input Voltage Range | 2V–24V (recommended range) |
| Output Voltage Range | Adjustable, up to 28V |
| Output Current | Continuous 1A–2A |
| Conversion Efficiency | Up to 97% (typical 92%) |
| Switching Frequency | 1.2MHz |
| Module Size | About 22mm × 17mm × 4mm |
| Interface | Screw terminals or pin headers |
In real use, the output current depends on many factors. When the input-output voltage difference increases, the maximum output current becomes lower.
Example:
MT3608 modules have many applications because of their high efficiency.
It can boost a single Li-ion battery (3.7V) to 5V/9V/12V for mobile devices or power banks.
In a 3.7V-to-5V case, it can reach about 94% efficiency, while linear regulators only reach about 70%.
It can drive several LEDs in series. For example, it can boost a battery to 12V–18V to drive 3–5 pieces of 3W LEDs. The constant-voltage output and a proper resistor keep the LED brightness stable.
It can power devices that need a higher voltage, like small speakers, portable routers, or digital frames. Its small size makes it good for space-limited devices.
It can power sensors that need special voltages, especially when a 24V industrial power supply must support lower-voltage devices.
Makers often use it in Arduino projects, robots, or any project needing low-to-high voltage conversion.
Efficiency rises as load increases from 0.1A and peaks at 0.5A–1A, then drops when approaching 2A.
Temperature also affects output current.
At 25°C: about 2A continuous
At 85°C: derated to about 1.2A
| Model | Input Range | Frequency | Max Output Current | Main Features |
| MT3608 | 2V–24V | 1.2MHz | 2A | High efficiency, small size |
| XL6009 | 5V–32V | 400kHz | 3A | Higher power, wide input range |
| LM2577 | 3.5V–40V | 52kHz | 3A | Cheap and reliable |
| FP6291 | 2.6V–12V | 1.2MHz | 4A | Strong current capability |
Choose based on voltage range, output current, efficiency, size, and cost.
Compared with FP6291, MT3608 has a wider input range and works better with Li-ion battery voltage changes.
Other points to consider:
Connect load negative to OUT-
Check polarity and input voltage (2V–24V). For the first test, use a current-limited power supply or a fuse.
Most modules include a blue multi-turn potentiometer:
Turn slowly. One full turn changes about 1–2V. You may need 10–15 turns to go from minimum to maximum voltage.
Use a digital multimeter with at least ±1% accuracy and a small flat screwdriver. Ensure the multimeter battery is not low.
Set the multimeter to DC voltage. Choose a range slightly higher than the expected output.
Example: For 12V output, use the 20V range.
Make sure the probes connect firmly.
Turn on the input power. Check the no-load voltage. It should be slightly higher than the rated value but within +10%. If not, turn OFF power and check the circuit.
Turn the potentiometer slowly while watching the multimeter value.
Move at a slow and steady speed. As you approach the target value, slow down further.
Hold the voltage for 3–5 minutes. The change should stay within ±2%.
If possible, test with the real load. The drop under load should be less than 5%.
Following these steps helps you obtain a stable and accurate output voltage. Correct adjustment improves device safety and extends the module’s life.
The MT3608 boost converter delivers reliable and efficient DC-DC power conversion. It boasts an efficiency of up to 98%, incorporates essential protection circuits such as undervoltage lockout, current limiting, and thermal overload protection, ensuring stable operation across diverse conditions.
The LM2596 operates as a buck converter, typically handling higher inputs and outputs, whereas the MT3608 functions as a boost converter, making it suitable for lower-power scenarios where a voltage increase is needed.
The boost converter, a category of DC-DC power converter, employs an inductor, a switching device, a diode, and a capacitor to achieve a higher output voltage.
In accordance with the fundamental principle of energy conservation, a boost converter cannot produce more power than it receives. Its operation involves converting voltage, not creating energy, so the output power is always less than or equal to the input power.