CKCS BS01 Mini DC-DC Boost Step-Up Converter – 2.5-5V Input to 5V/8V/9V/12V Fixed Output

The CKCS BS01 Mini DC-DC Boost Step-Up Converter is a small PCB-based voltage booster designed for converting low-voltage DC sources into higher fixed voltage rails.

It accepts approximately 2.5V to 5V DC input and provides four selectable output levels: 5V, 8V, 9V, and 12V. The selected output must be higher than the input voltage because this module is a boost converter.

Output Configuration

The output voltage is selected using the two solder pads marked A and B on the PCB:

The module is normally supplied in the 12V configuration. To change the output, use a soldering iron to connect or disconnect the appropriate A/B solder pads.

Features

• CKCS BS01 mini boost converter
• Converts low DC voltage to a higher voltage
• 2.5–5V DC input range
• Selectable 5V, 8V, 9V, and 12V outputs
• 12V default configuration
• A/B solder-pad output selection
• Suitable for 3.7V Li-ion/Li-Po battery projects
• Onboard power indicator LED
• Compact PCB design
• Low no-load consumption when the indicator is disabled
• Useful for portable and battery-powered electronics
• Suitable for mini UPS and backup-power projects

Applications

• 3.7V Li-ion battery to 5V conversion
• 3.7V battery to 8V/9V/12V conversion
• Mini UPS projects
• Wi-Fi router/ONU backup projects
• Portable electronics
• IoT devices
• Arduino and microcontroller projects
• Robotics
• Sensor power supplies
• DIY power-management circuits
• Battery-powered embedded systems

How to Use

1. Identify the IN+ / IN- and OUT+ / OUT- connections on the module.
2. Connect a suitable DC source between the input positive and negative terminals.
3. Ensure the input voltage is lower than the desired output voltage.
4. Before connecting your load, check the A/B solder-pad configuration.
5. Select 5V, 8V, 9V, or 12V using the appropriate A/B solder-pad combination.
6. Power the module and measure the output voltage with a multimeter.
7. Confirm the output voltage before connecting sensitive electronics.
8. Connect the load while staying within the appropriate output-current capability.

Important Notes

• This is a boost converter only. It cannot reduce a higher input voltage to a lower output voltage.
• The input voltage must be lower than the selected output voltage.
• Do not connect a voltage source higher than the module's specified input range.
• The output voltage is selected by solder pads, not by a continuously adjustable potentiometer.
• Always measure the output voltage before connecting sensitive equipment.
• Output current depends strongly on the input voltage and selected output voltage.
• The listed current figures are maximum/application figures and should not automatically be treated as guaranteed continuous output under all conditions.
• Higher voltage conversion generally reduces the available output current.
• Do not exceed the recommended load current; excessive loading can cause voltage drop, overheating, or module damage.
• Observe correct input and output polarity. Reverse polarity can damage the module.
• The onboard LED consumes additional current. On supported versions, disabling the LED can reduce no-load consumption.
• Allow adequate ventilation when operating near the module's current limits.
• This module does not include battery charging, battery balancing, or battery protection circuitry.
• When using a Li-ion/Li-Po cell, use a properly protected and appropriately charged battery system.
• Product dimensions may vary slightly between production batches.

Package Includes

• 1 × CKCS BS01 Mini DC-DC Boost Step-Up Converter Module