DC Buck Converter DC4~40V to 1.2~38V 3A USB Charger /Voltage Regulator/Car Adapter/Laptop Power /Tablet PC Adapter etc

  • Item ID #090641

List Price: $13.50 Our Price: $5.80Save 57%

Price(per unit)
Buy More: please contact us

It is Buck Converter Adjustable Voltage Regulator/Adapter/USB Charger,  Input voltage : DC4~40V, Output voltage :DC1.2~38V continuously adjustable, Output Current : 3A MAX, small size, high efficiency, long term stable and reliable quality,easy installation and use, Suitable for Battery Charger,Mobile Phone Charger,  electronic equipment, industrial equipment,LED drive,Advertising screen,Monitoring System etc

Other Products in DC Buck/Step Down

page 1 of 2 Previous Page Next Page

Module Parameters:

  • Module Properties: non-isolated step-down module (Buck),
    Voltage Regulator/Power Adapter/USB Charger.
  • Input voltage : DC4-40V
  • Quiescent Current : 5mA, not include the current of voltmeter
  • Output voltage :DC1.2-38V continuously adjustable , the default output is 5V.
  • Output Current : 3A MAX, Please enhance heat dissipation over 2A
  • Output power = input voltage * 3A
  • Working temperature: -40°c to +85°c ( please enhance heat dissipation when ambient temperature is too high )
  • Operating Frequency : 150KHz
  • Conversion efficiency : up to 95%
  • Overcurrent protection : Yes
  • Short-circuit protection: Yes
  • Input Reverse Polarity Protection: No , ( if necessary , please connect diode with input in series )
  • Output anti-anti- irrigation : Yes, no need for plus blocking diode when charging.
  • Identify resistance : Tablet PC , ipad, iphone ( some phones identify circuit is different, need to be adjusted )
  • Voltmeter minimum resolution : 0.05V/0.05A (10V or less automatically switch the decimal point )
  • Wiring: free welding output terminals


  • 1, DIY a power supply, with voltage display
  • 2, As the power supply for your electronic device, can set the output voltage value according to your system.
  • 3, As the car power supply, power for your laptop, PDA or a variety of digital products supply.
  • 4, solar panels regulator.
  • 5, DIY high current mobile power, with a single lithium battery can be boosted to 5V, built-in USB port and identify resistor, and a large current output 2.5A, which charging for some phone simultaneously.


  • 1, Voltmeter power options : you can select power the voltmeter from Input or Output by jumper on the board. you can short the jumper to reduce the loss of the voltmeter. Remove the the jumper cap, the voltmeter does not work.
  • 2, USB output port: USB interface is connected to the output directly, with the identify resistor. Please make sure the USB output voltage is consistent with the voltage of your products. Otherwise it will burn your digital products.
  • 3, Switch to display the voltage : VI: input voltage; VO: output voltage

Package include:

  • 1 x DC Buck Converter + Red LED Voltmeter  (Power Adapter+USB Charger)


* Required information
Choose a ranking for this item. 1 star is the worst and 5 stars is the best.
NOTE: HTML tags are not allowed.
NOTE: Reviews require prior approval before they will be displayed